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TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
Copyright (c) 2000, Power Innovations Limited, UK MARCH 1994 - REVISED MARCH 2000
TELECOMMUNICATION SYSTEM SECONDARY PROTECTION
G
Patented Ion-Implanted Breakdown Region - Precise DC and Dynamic Voltages
DEVICE `7072F3 `7082F3 V DRM V 58 66 V(BO) V 72 82
D PACKAGE (TOP VIEW)
T NC NC R
1 2 3 4
8 7 6 5
G NU NU G
MDXXAL
G G
Planar Passivated Junctions - Low Off-State Current ....................< 10 A Rated for International Surge Wave Shapes - Single and Simultaneous Impulses
WAVE SHAPE 2/10 8/20 10/160 10/700 10/560 10/1000 STANDARD GR-1089-CORE IEC 61000-4-5 FCC Part 68 FCC Part 68 ITU-T K.20/21 FCC Part 68 GR-1089-CORE ITSP A 85 80 65 50 45 40
P PACKAGE (TOP VIEW)
T NC NC R
1 2 3 4
8 7 6 5
G NU NU G
MDXXAJA
NC - No internal connection NU - Nonusable; no external electrical connection should be made to these pins. Specified ratings require connection of pin 5 and pin 8. SL PACKAGE (TOP VIEW)
G
..................UL Recognized Component
T G R
1 2 3
MDXXAGA MD7XAACA
description
The TISP7xxxF3 series are 3-point overvoltage protectors designed for protecting against metallic (differential mode) and simultaneous longitudinal (common mode) surges. Each terminal pair has the same voltage limiting values and surge current capability. This terminal pair surge capability ensures that the protector can meet the simultaneous longitudinal surge requirement which is typically twice the metallic surge requirement. Each terminal pair has a symmetrical voltagetriggered thyristor characteristic. Overvoltages are initially clipped by breakdown clamping until the voltage rises to the breakover level, which causes the device to crowbar into a low-voltage on state. This low-voltage on state causes the current resulting from the overvoltage to be .
AVAILABLE OPTIONS DEVICE TISP7xxxF3 TISP7xxxF3 TISP7xxxF3 PACKAGE D, Small-outline P, Plastic DIP SL, Single-in-line CARRIER
device symbol
T R
SD7XAB
G Terminals T, R and G correspond to the alternative line designators of A, B and C
ORDER # TISP7xxxF3DR TISP7xxxF3D TISP7xxxF3P TISP7xxxF3SL
TAPE AND REEL TUBE TUBE TUBE
PRODUCT
INFORMATION
Information is current as of publication date. Products conform to specifications in accordance with the terms of Power Innovations standard warranty. Production processing does not necessarily include testing of all parameters.
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TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
description (continued)
safely diverted through the device. The high crowbar holding current prevents d.c. latchup as the diverted current subsides.These protectors are guaranteed to voltage limit and withstand the listed lightning surges in both polarities. These low voltage devices are guaranteed to suppress and withstand the listed international lightning surges on any terminal pair. Nine similar devices with working voltages from 100 V to 275 V are detailed in the TISP7125F3 thru TISP7380F3 data sheet.
absolute maximum ratings, TA = 25 C (unless otherwise noted)
RATING Repetitive peak off-state voltage, 0 C < TA < 70 C `7072F3 `7082F3 Non-repetitive peak on-state pulse current (see Notes 1 and 2) 1/2 (Gas tube differential transient, 1/2 voltage wave shape) 2/10 (Telcordia GR-1089-CORE, 2/10 voltage wave shape) 1/20 (ITU-T K.22, 1.2/50 voltage wave shape, 25 resistor) 8/20 (IEC 61000-4-5, combination wave generator, 1.2/50 voltage wave shape) 10/160 (FCC Part 68, 10/160 voltage wave shape) 4/250 (ITU-T K.20/21, 10/700 voltage wave shape, simultaneous) 0.2/310 (CNET I 31-24, 0.5/700 voltage wave shape) 5/310 (ITU-T K.20/21, 10/700 voltage wave shape, single) 5/320 (FCC Part 68, 9/720 voltage wave shape, single) 10/560 (FCC Part 68, 10/560 voltage wave shape) 10/1000 (Telcordia GR-1089-CORE, 10/1000 voltage wave shape) Non-repetitive peak on-state current, 0 C < TA < 70 C (see Notes 1 and 3) 50 Hz, 1s D Package P Package SL Package Initial rate of rise of on-state current, Junction temperature Storage temperature range Linear current ramp, Maximum ramp value < 38 A diT/dt TJ Tstg ITSM 4.3 5.7 7.1 250 -65 to +150 -65 to +150 A/s C C A IPPSM 240 85 45 80 65 60 50 50 50 45 40 A VDRM 58 66 V SYMBOL VALUE UNIT
NOTES: 1. Initially the TISP(R) must be in thermal equilibrium at the specified TA. The surge may be repeated after the TISP(R) returns to its initial conditions. The rated current values may be applied singly either to the R to G or to the T to G or to the T to R terminals. Additionally, both R to G and T to G may have their rated current values applied simultaneously (In this case the total G terminal current will be twice the above rated current values). 2. See Thermal Information for derated IPPSM values 0 C < TA < 70 C and Applications Information for details on wave shapes. 3. Above 70 C, derate ITSM linearly to zero at 150 C lead temperature.
PRODUCT
INFORMATION
2
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
electrical characteristics for all terminal pairs, TA = 25 C (unless otherwise noted)
PARAMETER IDRM V(BO) Repetitive peak offstate current Breakover voltage TEST CONDITIONS V D = VDRM, 0 C < TA < 70 C dv/dt = 250 V/ms, R SOURCE = 300 dv/dt 1000 V/s, Linear voltage ramp, V(BO) Impulse breakover voltage Breakover current On-state voltage Holding current Critical rate of rise of off-state voltage Off-state current Maximum ramp value = 500 V di/dt = 20 A/s, Linear current ramp, Maximum ramp value = 10 A I(BO) VT IH dv/dt ID dv/dt = 250 V/ms, R SOURCE = 300 IT = 5 A, tW = 100 s IT = 5 A, di/dt = +/-30 mA/ms Linear voltage ramp, Maximum ramp value < 0.85V DRM VD = 50 V f = 1 MHz, f = 1 MHz, f = 1 MHz, Coff Off-state capacitance f = 1 MHz, f = 1 MHz, f = 1 MHz, (see Note 4) NOTE 4: Three-terminal guarded measurement, unmeasured terminal voltage bias is zero. First five capacitance values, with bias VD, are for the R-G and T-G terminals only. The last capacitance value, with bias VDTR, is for the T-R terminals. V d = 1 V rms, VD = 0 Vd = 1 V rms, VD = -1 V Vd = 1 V rms, VD = -2 V Vd = 1 V rms, VD = -5 V Vd = 1 V rms, VD = -50 V Vd = 1 V rms, VDTR = 0 53 56 51 43 25 29 0.15 5 10 69 73 66 56 33 37 pF 0.1 0.8 5 A V A kV/s A `7072F3 `7082F3 90 100 V `7072F3 `7082F3 MIN TYP MAX 10 72 82 UNIT A V
PRODUCT
INFORMATION
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TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
thermal characteristics
PARAMETER TEST CONDITIONS P tot = 0.8 W, TA = 25C 5 cm 2, FR4 PCB D Package P Package SL Package MIN TYP MAX 160 100 135 C/W UNIT
R JA
Junction to free air thermal resistance
PARAMETER MEASUREMENT INFORMATION
+i ITSP Quadrant I Switching Characteristic
ITSM
V(BO)
IH IDRM -v VDRM IDRM IH VD ID ID VD VDRM +v I(BO)
I(BO)
V(BO)
ITSM Quadrant III Switching Characteristic ITSP -i
PMXXAAA
Figure 1. VOLTAGE-CURRENT CHARACTERISTIC FOR T AND R TERMINALS T and G and R and G measurements are referenced to the G terminal T and R measurements are referenced to the R terminal
PRODUCT
INFORMATION
4
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
TYPICAL CHARACTERISTICS R and G, or T and G terminals
OFF-STATE CURRENT vs JUNCTION TEMPERATURE
100
TC7LAC
NORMALISED BREAKDOWN VOLTAGES vs JUNCTION TEMPERATURE
TC7LAE
Normalised Breakdown Voltages
1.2
10 ID - Off-State Current - A
1
1.1 V(BO) V(BR)M 1.0 V(BR) Normalised to V(BR) I(BR) = 1 mA and 25C Positive Polarity
0*1
VD = -50 V VD = 50 V
0*01
0*001 -25 0 25 50 75 100 125 150 TJ - Junction Temperature - C
0.9 -25 0 25 50 75 100 125 150 TJ - Junction Temperature - C
Figure 2.
Figure 3.
NORMALISED BREAKDOWN VOLTAGES vs JUNCTION TEMPERATURE
TC7LAF
ON-STATE CURRENT vs ON-STATE VOLTAGE
100 Positive Polarity
TC7LAL
Normalised Breakdown Voltages
1.2
1.1 V(BO)
IT - On-State Current - A
Normalised to V(BR) I(BR) = 1 mA and 25C Negative Polarity
10
1.0 V(BR) V(BR)M 0.9 -25 0 25 50 75 100 125 150 TJ - Junction Temperature - C
150C
25C -40C
1 1 2 3 4 5 6 7 8 9 10 VT - On-State Voltage - V
Figure 4.
Figure 5.
PRODUCT
INFORMATION
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TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
TYPICAL CHARACTERISTICS R and G, or T and G terminals
ON-STATE CURRENT vs ON-STATE VOLTAGE
100 Negative Polarity
HOLDING CURRENT & BREAKOVER CURRENT vs JUNCTION TEMPERATURE
IH, I(BO) - Holding Current, Breakover Current - A 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 -I(BO) +I(BO)
TC7LAM
TC7LAH
IT - On-State Current - A
10
0.2
IH
150C
25C -40C
1 1 2 3 4 5 6 7 8 9 10 VT - On-State Voltage - V
0.1 -25 0 25 50 75 100 125 150 TJ - Junction Temperature - C
Figure 6.
Figure 7.
NORMALISED BREAKOVER VOLTAGE vs RATE OF RISE OF PRINCIPLE CURRENT
1.5
TC7LAU
SURGE CURRENT vs DECAY TIME
1000
TC7LAA
Negative Normalised Breakover Voltage Maximum Surge Current - A Positive 1.4
1.3
100
1.2
1.1
1.0 0*001
10 0*01 0*1 1 10 100 2 10 100 Decay Time - s 1000 di/dt - Rate of Rise of Principle Current - A/s
Figure 8.
Figure 9.
PRODUCT
INFORMATION
6
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
TYPICAL CHARACTERISTICS R and T terminals
OFF-STATE CURRENT vs JUNCTION TEMPERATURE
100
TC7LAD
NORMALISED BREAKDOWN VOLTAGES vs JUNCTION TEMPERATURE
TC7LAG
Normalised Breakdown Voltages
1.2
10 ID - Off-State Current - A
V(BR)M 1.1
1
0*1
1.0
V(BO) V(BR)
0*01
0*001 -25 0 25 50 75 100 125 150 TJ - Junction Temperature - C
0.9 -25 0 25 50 75 100 125 150 TJ - Junction Temperature - C
Figure 10.
Figure 11.
ON-STATE CURRENT vs ON-STATE VOLTAGE
100
HOLDING CURRENT & BREAKOVER CURRENT vs
IH, I(BO) - Holding Current, Breakover Current - A
TC7LAK
JUNCTION TEMPERATURE
1.0 0.9 0.8 0.7 0.6 0.5 0.4 I(BO) 0.3
TC7LAJ
IT - On-State Current - A
10
0.2
IH
150C
25C -40C
1 1 2 3 4 5 6 7 8 9 10 VT - On-State Voltage - V
0.1 -25 0 25 50 75 100 125 150 TJ - Junction Temperature - C
Figure 12.
Figure 13.
PRODUCT
INFORMATION
7
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
TYPICAL CHARACTERISTICS R and T terminals
NORMALISED BREAKOVER VOLTAGE vs RATE OF RISE OF PRINCIPLE CURRENT
1.5
TC7LAV
Normalised Breakover Voltage
1.4
1.3
1.2
1.1
1.0 0*001
0*01
0*1
1
10
100
di/dt - Rate of Rise of Principle Current - A/s
Figure 14.
PRODUCT
INFORMATION
8
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
THERMAL INFORMATION
MAXIMUM NON-RECURRING 50 Hz CURRENT vs CURRENT DURATION
TI7LAA
THERMAL RESPONSE
TI7MAB
ITRMS - Maximum Non-Recurrent 50 Hz Current - A
VGEN = 250 Vrms RGEN = 10 to 150 10 SL Package
Z J - Transient Thermal Impedance - C/W
100
D Package P Package
10
P Package
SL Package
D Package 1 0*1 1 10 100 1000
1 0*0001 0*001
0*01
0*1
1
10
100
1000
t - Power Pulse Duration - s
t - Current Duration - s
Figure 15.
Figure 16.
PRODUCT
INFORMATION
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TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
THERMAL INFORMATION Non-repetitive peak on-state pulse derated values for 0 C TA 70 C
RATING Non-repetitive peak on-state pulse current, 0 C < TA < 70 C (see Notes 5, 6 and 7) 1/2 (Gas tube differential transient, 1/2 voltage wave shape) 2/10 (Telcordia GR-1089-CORE, 2/10 voltage wave shape) 1/20 (ITU-T K.22, 1.2/50 voltage wave shape, 25 resistor) 8/20 (IEC 61000-4-5, combination wave generator, 1.2/50 voltage wave shape) 10/160 (FCC Part 68, 10/160 voltage wave shape) 4/250 (ITU-T K.20/21, 10/700 voltage wave shape, dual) 0.2/310 (CNET I 31-24, 0.5/700 voltage wave shape) 5/310 (ITU-T K.20/21, 10/700 voltage wave shape, single) 5/320 (FCC Part 68, 9/720 voltage wave shape) 10/560 (FCC Part 68, 10/560 voltage wave shape) 10/1000 (Telcordia GR-1089-CORE, 10/1000 voltage wave shape) IPPSM 130 80 45 75 55 50 50 50 50 40 40 A SYMBOL VALUE UNIT
NOTES: 5. Initially the TISP(R) must be in thermal equilibrium at the specified TA. The impulse may be repeated after the TISP (R) returns to its initial conditions. The rated current values may be applied either to the R to G or to the T to G or to the T to R terminals. Additionally, both R to G and T to G may have their rated current values applied simultaneously (In this case the total G terminal current will be twice the above rated current values). 6. See Applications Information for details on wave shapes. 7. Above 70 C, derate IPPSM linearly to zero at 150 C lead temperature.
PRODUCT
INFORMATION
10
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
APPLICATIONS INFORMATION deployment
These devices are three terminal overvoltage protectors. They limit the voltage between three points in the circuit. Typically, this would be the two line conductors and protective ground (Figure 17).
Th3 Th1 Th2
Figure 17. MULTI-POINT PROTECTION
In Figure 17, protectors Th2 and Th3 limit the maximum voltage between each conductor and ground to the V(BO) of the individual protector. Protector Th1 limits the maximum voltage between the two conductors to its V(BO) value.
lightning surge
wave shape notation Most lightning tests, used for equipment verification, specify a unidirectional sawtooth waveform which has an exponential rise and an exponential decay. Wave shapes are classified in terms of rise time in microseconds and a decay time in microseconds to 50% of the maximum amplitude. The notation used for the wave shape is rise time/decay time, without the microseconds quantity and the "/" between the two values has no mathematical significance. A 50A, 5/310 waveform would have a peak current value of 50 A, a rise time of 5 s and a decay time of 310 s. The TISP(R) surge current graph comprehends the wave shapes of commonly used surges. generators There are three categories of surge generator type: single wave shape, combination wave shape and circuit defined. Single wave shape generators have essentially the same wave shape for the open circuit voltage and short circuit current (e.g. 10/1000 open circuit voltage and short circuit current). Combination generators have two wave shapes, one for the open circuit voltage and the other for the short circuit current (e.g. 1.2/50 open circuit voltage and 8/20 short circuit current) Circuit specified generators usually equate to a combination generator, although typically only the open circuit voltage wave shape is referenced (e.g. a 10/700 open circuit voltage generator typically produces a 5/310 short circuit current). If the combination or circuit defined generators operate into a finite resistance the wave shape produced is intermediate between the open circuit and short circuit values.
ITU-T 10/700 generator
This circuit defined generator is specified in many standards. The descriptions and values are not consistent between standards and it is important to realise that it is always the same generator being used. Figure 18 shows the 10/700 generator circuit defined in ITU-T recommendation K.20 (10/96) "Resistibility of telecommunication switching equipment to overvoltages and overcurrents". The basic generator comprises of: capacitor C1, charged to voltage VC, which is the energy storage element. switch SW to discharge the capacitor into the output shaping network
PRODUCT
INFORMATION
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TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
shunt resistor R1, series resistor R 2 and shunt capacitor C 2 form the output shaping network. series feed resistor R3 to connect to one line conductor for single surge series feed resistor R4 to connect to the other line conductor for dual surging
VC 2.0 kV R2 15 R3 25 50 A 5/310 T C1 20 F R1 50 C2 200 nF R R T R G 50 A 5/310 T R AND T TEST
SW
G
G R AND G TEST
10/700 GENERATOR - SINGLE TERMINAL PAIR TEST
T AND G TEST
R4 25 VC 3.3 kV R2 15 R3 25 60 A 4/250
60 A 4/250
SW
T C1 20 F R1 50 C2 200 nF 120 A 4/250 G 10/700 GENERATOR - DUAL TERMINAL PAIR TEST DUAL T AND G, R AND G TEST
R
Figure 18.
In the normal single surge equipment test configuration, the unsurged line is grounded. This is shown by the dotted lines in the top drawing of Figure 18. However, doing this at device test places one terminal pair in parallel with another terminal pair. To check the individual terminal pairs of the TISP7xxxF3, without any paralleled operation, the unsurged terminal is left unconnected. With the generator output open circuit, when SW closes, C1 discharges through R1. The decay time constant will be C1R1, or 20 x 50 = 1000 s. For the 50% voltage decay time the time constant needs to be multiplied by 0.697, giving 0.697 x 1000 = 697 s which is rounded to 700 s. The output rise time is controlled by the time constant of R2 and C 2. which is 15 x 200 = 3000 ns or 3 s. Virtual voltage rise times are given by straight line extrapolation through the 30% and 90% points of the voltage waveform to zero and 100%. Mathematically this is equivalent to 3.24 times the time constant, which gives 3.24 x 3 = 9.73 which is rounded to 10 s. Thus the open circuit voltage rises in 10 s and decays in 700 s, giving the 10/700 generator its name. When the overvoltage protector switches it effectively shorts the generator output via the series 25 resistor. Two short circuit conditions need to be considered: single output using R3 only (top circuit of Figure 18) and dual output using R3 and R 4 (bottom circuit of Figure 18). For the single test, the series combination of R2 and R3 (15 + 25 = 40 ) is in shunt with R 1. This lowers the discharge resistance from 50 to 22.2 , giving a discharge time constant of 444 s and a 50% current decay time of 309.7 s, which is rounded to 310 s. For the rise time, R2 and R3 are in parallel, reducing the effective source resistance from 15 to 9.38 , giving a time constant of 1.88 s. Virtual current rise times are given by straight line extrapolation through the 10% and 90% points of the current waveform to zero and 100%. Mathematically this is equivalent to 2.75
PRODUCT
INFORMATION
12
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
times the time constant, which gives 2.75 x 1.88 = 5.15, which is rounded to 5 s. Thus the short circuit current rises in 5 s and decays in 310 s, giving the 5/310 wave shape. The series resistance from C1 to the output is 40 giving an output conductance of 25 A/kV. For each 1 kV of capacitor charge voltage, 25 A of output current will result. For the dual test, the series combination of R2 plus R3 and R4 in parallel (15 + 12.5 = 27.5 ) is in shunt with R1. This lowers the discharge resistance from 50 to 17.7 , giving a discharge time constant of 355 s and a 50% current decay time of 247 s, which is rounded to 250 s. For the rise time, R2, R3 and R4 are in parallel, reducing the effective source resistance from 15 to 6.82 , giving a time constant of 1.36 s, which gives a current rise time of 2.75 x 1.36 = 3.75, which is rounded to 4 s. Thus the short circuit current rises in 4 s and decays in 250 s, giving the 4/250 wave shape. The series resistance from C1 to an individual output is 2 x 27.5 = 55 giving an output conductance of 18 A/kV. For each 1 kV of capacitor charge voltage, 18 A of output current will result. At 25 C these protectors are rated at 50 A for the single terminal pair condition and 60 A for the dual condition (R and G terminals and T and G terminals). In terms of generator voltage, this gives a maximum generator setting of 50 x 40 = 2.0 kV for the single condition and 2 x 60 x 27.5 = 3.3 kV for the dual condition. The higher generator voltage setting for the dual condition is due to the current waveform decay being shorter at 250 s compared to the 310 s value of the single condition. Other ITU-T recommendations use the 10/700 generator: K.17 (11/88) "Tests on power-fed repeaters using solid-state devices in order to check the arrangements for protection from external interference" and K.21(10/ 96) "Resistibility of subscriber's terminal to overvoltages and overcurrents", K.30 (03/93) "Positive temperature coefficient (PTC) thermistors". Several IEC publications use the 10/700 generator, common ones are IEC 6100-4-5 (03/95) "Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 5: Surge immunity test" and IEC 60950 (04/99) "Safety of information technology equipment". The IEC 60950 10/700 generator is carried through into other "950" derivatives. Europe is harmonised by CENELEC (Comite Europeen de Normalization Electro-technique) under EN 60950 (included in the Low Voltage Directive, CE mark). US has UL (Underwriters Laboratories) 1950 and Canada CSA (Canadian Standards Authority) C22.2 No. 950. FCC Part 68 "Connection of terminal equipment to the telephone network" (47 CFR 68) uses the 10/700 generator for Type B surge testing. Part 68 defines the open circuit voltage wave shape as 9/720 and the short circuit current wave shape as 5/320 for a single output. The current wave shape in the dual (longitudinal) test condition is not defined, but it can be assumed to be 4/250. Several VDE publications use the 10/700 generator, for example: VDE 0878 Part 200 (12/92) "Electromagnetic compatibility of information technology equipment and telecommunications equipment; Immunity of analogue subscriber equipment".
1.2/50 generators
The 1.2/50 open circuit voltage and 8/20 short circuit current combination generator is defined in IEC 610004-5 (03/95) "Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 5: Surge immunity test". This generator has a fictive output resistance of 2 , meaning that dividing the open circuit output voltage by the short circuit output current gives a value of 2 (500 A/kV).
PRODUCT
INFORMATION
13
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
The combination generator has three testing configurations; directly applied for testing between equipment a.c. supply connections, applied via an external 10 resistor for testing between the a.c. supply connections and ground, and applied via an external 40 resistor for testing all other lines. For unshielded unsymmetrical data or signalling lines, the combination generator is applied via a 40 resistor either between lines or line to ground. For unshielded symmetrical telecommunication lines, the combination generator is applied to all lines via a resistor of n x 40 , where n is the number of conductors and the maximum value of external feed resistance is 250 . Thus for four conductors n = 4 and the series resistance is 4 x 40 = 160 . For ten conductors the resistance cannot be 10 x 40 = 400 and must be 250 . The combination generator is used for short distance lines, long distance lines are tested with the 10/700 generator. When the combination generator is used with a 40 , or more, external resistor, the current wave shape is not 8/20, but becomes closer to the open circuit voltage wave shape of 1.2/50. For example, a commercial generator when used with 40 produced an 1.4/50 wave shape. The wave shapes of 1.2/50 and 8/20 occur in other generators as well. British Telecommunication has a combination generator with 1.2/50 voltage and 8/20 current wave shapes, but it has a fictive resistance of 1 . ITU-T recommendation K.22 "Overvoltage resistibility of equipment connected to an ISDN T/S BUS" (05/95) has a 1.2/50 generator option using only resistive and capacitive elements, Figure 19.
C4 8 nF VC 1 kV R2 13 C3 8 nF NOTE: SOME STANDARDS REPLACE OUTPUT CAPACITORS WITH 25 RESISTORS
SW
C1 1 F
R1 76
C2 30 nF
K.22 1.2/50 GENERATOR
Figure 19.
The K.22 generator produces a 1.4/53 open circuit voltage wave. Using 25 output resistors, gives a single short circuit current output wave shape of 0.8/18 with 26 A/kV and a dual of 0.6/13 with 20 A/kV. These current wave shapes are often rounded to 1/20 and 0.8/14. There are 8/20 short circuit current defined generators. These are usually very high current, 10 kA or more and are used for testing a.c. protectors, primary protection modules and some Gas Discharge Tubes.
impulse testing
To verify the withstand capability and safety of the equipment, standards require that the equipment is tested with various impulse wave forms. The table in this section shows some common test values. Manufacturers are being increasingly required to design in protection coordination. This means that each protector is operated at its design level and currents are diverted through the appropriate protector e.g. the primary level current through the primary protector and lower levels of current may be diverted through the secondary or inherent equipment protection. Without coordination, primary level currents could pass through the equipment only designed to pass secondary level currents. To ensure coordination happens with fixed voltage protectors, some resistance is normally used between the primary and secondary protection (R1a and R1b Figure 21). The coordination resistance values given in here apply to a 400 V (d.c. sparkover) gas discharge tube primary protector and the appropriate test voltage when the equipment is tested with a primary protector.
PRODUCT
INFORMATION
14
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000 PEAK VOLTAGE STANDARD SETTING V GR-1089-CORE 2500 1000 1500 FCC Part 68 (March 1998) 800 1000 1500 1500 I 31-24 1500 1000 ITU-T K20/K21 1500 4000 4000 VOLTAGE WAVE FORM s 2/10 10/1000 10/160 10/560 9/720 (SINGLE) (DUAL) 0.5/700 10/700 (SINGLE) (SINGLE) (DUAL) PEAK CURRENT VALUE A 2 x 500 2 x 100 200 100 25 37.5 2 x 27 37.5 25 37.5 100 2 x 72 CURRENT s 2/10 10/1000 10/160 10/560 5/320 5/320 4/250 0.2/310 5/310 5/310 5/310 4/250 TISP7xxxF3 A 2 x 85 2 x 40 65 45 50 50 2 x 60 50 50 50 50 2 x 60 0 0 0 40 12 NA NA NA 8 7 0 SERIES 25 16 10 NA COORDINATION RESISTANCE (MIN.) NA
WAVE FORM 25 C RATING RESISTANCE
FCC Part 68 terminology for the waveforms produced by the ITU-T recommendation K21 10/700 impulse generator NA = Not Applicable, primary protection removed or not specified.
If the impulse generator current exceeds the protectors current rating then a series resistance can be used to reduce the current to the protectors rated value and so prevent possible failure. The required value of series resistance for a given waveform is given by the following calculations. First, the minimum total circuit impedance is found by dividing the impulse generators peak voltage by the protectors rated current. The impulse generators fictive impedance (generators peak voltage divided by peak short circuit current) is then subtracted from the minimum total circuit impedance to give the required value of series resistance. In some cases the equipment will require verification over a temperature range. By using the derated waveform values from the thermal information section, the appropriate series resistor value can be calculated for ambient temperatures in the range of 0 C to 70 C.
protection voltage
The protection voltage, (V(BO) ), increases under lightning surge conditions due to thyristor regeneration. This increase is dependent on the rate of current rise, di/dt, when the TISP(R) is clamping the voltage in its breakdown region. The V(BO) value under surge conditions can be estimated by multiplying the 50 Hz rate V(BO) (250 V/ms) value by the normalised increase at the surge's di/dt. An estimate of the di/dt can be made from the surge generator voltage rate of rise, dv/dt, and the circuit resistance. As an example, the ITU-T recommendation K.21 1.5 kV, 10/700 surge has an average dv/dt of 150 V/s, but, as the rise is exponential, the initial dv/dt is three times higher, being 450 V/s. The instantaneous generator output resistance is 25 . If the equipment has an additional series resistance of 20 , the total series resistance becomes 45 . The maximum di/dt then can be estimated as 450/45 = 10 A/s. In practice the measured di/dt and protection voltage increase will be lower due to inductive effects and the finite slope resistance of the TISP(R) breakdown region.
capacitance off-state capacitance
The off-state capacitance of a TISP(R) is sensitive to junction temperature, TJ , and the bias voltage, comprising of the dc voltage, VD , and the ac voltage, Vd . All the capacitance values in this data sheet are measured with an ac voltage of 1 V rms. When VD >> Vd the capacitance value is independent on the value of Vd . Up to 10 MHz the capacitance is essentially independent of frequency. Above 10 MHz the effective capacitance is strongly dependent on connection inductance. For example, a printed wiring (PW) trace of 10 cm could create a circuit resonance with the device capacitance in the region of 80 MHz.
PRODUCT
INFORMATION
15
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
longitudinal balance
Figure 20 shows a three terminal TISP(R) with its equivalent "delta" capacitance. Each capacitance, CTG , C RG and CTR , is the true terminal pair capacitance measured with a three terminal or guarded capacitance bridge. If wire R is biased at a larger potential than wire T then CTG > CRG . Capacitance C TG is equivalent to a capacitance of CRG in parallel with the capacitive difference of (C TG - C RG ). The line capacitive unbalance is due to (CTG - CRG ) and the capacitance shunting the line is CTR + CRG/2 .
Figure 20.
All capacitance measurements in this data sheet are three terminal guarded to allow the designer to accurately assess capacitive unbalance effects. Simple two terminal capacitance meters (unguarded third terminal) give false readings as the shunt capacitance via the third terminal is included.
PRODUCT
INFORMATION
16
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
typical circuits
TIP WIRE
F1a
R1a Th3 GDTa GDTb Th2 Th1 PROTECTED EQUIPMENT
F1b RING WIRE
R1b TISP7xxxF3
AI7XBP
Figure 21. PROTECTION MODULE
R1a Th3 Th1 Th2 R1b TISP70xxF3 D.C. AI7XBQ SIGNAL
Figure 22. SELV DATA AND BATTERY FEED PROTECTION
R1a Th3 Th1 Th2 R1b TISP70xxF3 D.C. TISP70xxF3 R1a Th3 Th1 Th2 R1b
AI7XBR
RX SIGNAL
TX SIGNAL
Figure 23. SELV DATA AND BATTERY FEED WITH SEPARATE RX AND TX
PRODUCT
INFORMATION
17
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
MECHANICAL DATA D008 plastic small-outline package
This small-outline package consists of a circuit mounted on a lead frame and encapsulated within a plastic compound. The compound will withstand soldering temperature with no deformation, and circuit performance characteristics will remain stable when operated in high humidity conditions. Leads require no additional cleaning or processing when used in soldered assembly.
D008 5,00 (0.197) 4,80 (0.189) 8 7 6 5 8-pin Small Outline Microelectronic Standard Package MS-012, JEDEC Publication 95
6,20 (0.244) 5,80 (0.228)
INDEX
4,00 (0.157) 3,81 (0.150)
1
2
3
4
1,75 (0.069) 1,35 (0.053)
7 NOM 3 Places
0,50 (0.020) x 45NOM 0,25 (0.010)
5,21 (0.205) 4,60 (0.181)
0,203 (0.008) 0,102 (0.004) 0,79 (0.031) 0,28 (0.011) Pin Spacing 1,27 (0.050) (see Note A) 6 Places
0,51 (0.020) 0,36 (0.014) 8 Places 0,229 (0.0090) 0,190 (0.0075)
7 NOM 4 Places
4 4
1,12 (0.044) 0,51 (0.020)
ALL LINEAR DIMENSIONS ARE IN MILLIMETERS AND PARENTHETICALLY IN INCHES
MDXXAAC
NOTES: A. B. C. D.
Leads are within 0,25 (0.010) radius of true position at maximum material condition. Body dimensions do not include mold flash or protrusion. Mold flash or protrusion shall not exceed 0,15 (0.006). Lead tips to be planar within 0,051 (0.002).
PRODUCT
INFORMATION
18
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
MECHANICAL DATA D008 tape dimensions
D008 Package (8-pin Small Outline) Single-Sprocket Tape
4,10 3,90 8,10 7,90 2,05 1,95
1,60 1,50 0,40 0,8 MIN.
5,60 5,40
12,30 11,70
6,50 6,30 Carrier Tape Embossment
o 1,5 MIN.
0 MIN. Direction of Feed 2,2 2,0
Cover Tape
ALL LINEAR DIMENSIONS IN MILLIMETERS NOTES: A. Taped devices are supplied on a reel of the following dimensions:Reel diameter: Reel hub diameter: Reel axial hole: B. 2500 devices are on a reel. 330 +0,0/-4,0 mm 100 2,0 mm 13,0 0,2 mm
MDXXATB
PRODUCT
INFORMATION
19
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
MECHANICAL DATA P008 plastic dual-in-line package
This dual-in-line package consists of a circuit mounted on a lead frame and encapsulated within a plastic compound. The compound will withstand soldering temperature with no deformation, and circuit performance characteristics will remain stable when operated in high humidity conditions The package is intended for insertion in mounting-hole rows on 7,62 (0.300) centres. Once the leads are compressed and inserted, sufficient tension is provided to secure the package in the board during soldering. Leads require no additional cleaning or processing when used in soldered assembly.
P008 9,75 (0.384) 9,25 (0.364) 8 7 6 5
Index Notch
6,60 (0.260) 6,10 (0.240)
1
2
3
4
1,78 (0.070) MAX 4 Places
8,23 (0.324) 7,62 (0.300)
5,08 (0.200) MAX Seating Plane 0,51 (0.020) MIN 3,17 (0.125) MIN 0,36 (0.014) 0,20 (0.008)
0,53 (0.021) 0,38 (0.015) 8 Places
2,54 (0.100) Typical (see Note A) 6 Places
9,40 (0.370) 8,38 (0.330)
ALL LINEAR DIMENSIONS IN MILLIMETERS AND PARANTHETICALLY IN INCHES
MDXXCF
NOTES: A. Each pin centreline is located within 0,25 (0.010) of its true longitudinal position. B. Dimensions fall within JEDEC MS001 - R-PDIP-T, 0.300" Dual-In-Line Plastic Family. C. Details of the previous dot index P008 package style, drawing reference MDXXABA, are given in the earlier publications.
PRODUCT
INFORMATION
20
TISP7072F3, TISP7082F3 TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
MARCH 1994 - REVISED MARCH 2000
MECHANICAL DATA SL003 3-pin plastic single-in-line package
This single-in-line package consists of a circuit mounted on a lead frame and encapsulated within a plastic compound. The compound will withstand soldering temperature with no deformation, and circuit performance characteristics will remain stable when operated in high humidity conditions. Leads require no additional cleaning or processing when used in soldered assembly.
SL003 9,75 (0.384) 9,25 (0.364) 3,40 (0.134) 3,20 (0.126)
Index Notch
8,31 (0.327) MAX 12,9 (0.492) MAX
6,60 (0.260) 6,10 (0.240)
4,267 (0.168) MIN
1
2
3 2,54 (0.100) Typical (see Note A) 2 Places 0,356 (0.014) 0,203 (0.008)
1,854 (0.073) MAX 0,711 (0.028) 0,559 (0.022) 3 Places
ALL LINEAR DIMENSIONS IN MILLIMETERS AND PARANTHETICALLY IN INCHES
MDXXCE
NOTES: A. Each pin centreline is located within 0,25 (0.010) of its true longitudinal position. B. Body molding flash of up to 0,15 (0.006) may occur in the package lead plane. C. Details of the previous dot index SL003 style, drawing reference MDXXAD, are given in the earlier publications.
PRODUCT
INFORMATION
21

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