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POLYFUSE(R) Resettable PTCs
Radial Leaded
250R Series
Description * The 250R series is designed to protect against short duration high voltage fault currents (power cross or power induction surge) typically found in telecom applications (250Vrms). The series can be used to help telecom networking equipment meet the protection requirements specified in ITU K.20 and K.21. Features * RoHS compliant and lead-free * Fast time-to-trip * Binned and sorted narrow resistance ranges available Applications * Customer Premises Equipment (CPE) * Central Office (CO)/ Telecom Centers
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Agency Approvals
AGENCY AGENCY FILE NUMBER E183209 R50082521
* 0.08 - 0.18 Hold current range, 60VDC operating voltage * 250VAC interrupt rating
* LAN/WAN Equipment * Access equipment
Electrical Characteristics
I hold (A) 0.08 0.08 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.145 0.145 0.145 0.145 0.18 0.18
C: coated device
Part Number
I trip (A) 0.16 0.16 0.24 0.24 0.24 0.24 0.24 0.24 0.24 0.24 0.29 0.29 0.29 0.29 0.65 0.65
Vmax Vint / Vop 250/60 250/60 250/60 250/60 250/60 250/60 250/60 250/60 250/60 250/60 250/60 250/60 250/60 250/60 250/60 250/60
I max (A) 3 3 3 3 3 3 3 3 3 3 3 3 3 3 10 10
Pd max. (W) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1.8 1.8
Maximum Time To Trip Current (A) 0.35 0.35 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Time (Sec.) 3 3 1.5 1.0 0.85 0.7 0.8 0.7 1 1.2 2.5 5 2.5 2.0 21 20 R min () 15 14 4 7 5.4 6 6 8 8 7 3 3 4.5 5.4 0.8 1.4
Resistance R typ () 22 22 8 9 7.5 10.5 9 10.5 10 12 6 5.5 6 7.5 2.2 3.9 R 1max () 33 33 16 16 14 16 16 16 16 16 14 12 14 14 4 4.5
Agency Approvals
250R080T 250R080 250R120 250R120-RA 250R120-RC 250R120-RF 250R120-R1 250R120-R2 250R120-R3 250R120T 250R145 250R145-RA 250R145-RB 250R145T 250R180 250R180T
*typical value
X X X X X X X X X X X X X X X X
X X X X X X X X X X X X X X X X
T: pre-tripped device
250R Series Specifications are subject to change without notice.
Electronics Designers Guide
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POLYFUSE(R) Resettable PTCs
Radial Leaded
Temperature Rerating
Ambient Operation Temperature -40C Part Number 250R080 250R080T 250R120 250R120T 250R145 250R145T 250R180 250R180T 0.12 0.12 0.18 0.18 0.26 0.26 0.28 0.28
250R Series
-20C
0C
23C
40C Hold Current (A)
50C
60C
70C
85C
0.11 0.11 0.16 0.16 0.20 0.20 0.23 0.23
0.09 0.09 0.14 0.14 0.17 0.17 0.21 0.21
0.08 0.08 0.12 0.12 0.145 0.145 0.18 0.18
0.06 0.06 0.10 0.10 0.12 0.12 0.16 0.16
0.05 0.05 0.09 0.09 0.11 0.11 0.13 0.13
0.05 0.05 0.08 0.08 0.09 0.09 0.10 0.10
0.04 0.04 0.06 0.06 0.08 0.08 0.11 0.11
0.03 0.03 0.05 0.05 0.06 0.06 0.083 0.083
Average Time Current Curves
0.120A 0.145A 0.080A 0.180A
Temperature Rerating Curve
170% 150% Percentage of Rated Current 130% 110% 90% 70% 50% 30% 10%
100000
10000
1000
TIME IN SECONDS
100
10
-40 -30 -20
-10
0
10
20 30 40 Temperature (C)
50
60
70
80
1
0.100
0.010
0.001 0.02 0.100 1 10 100
CURRENT IN AMPERES
Specifications are subject to change without notice.
Note: 1.00 means the number one with two decimal places. AKL V3.9 06.05.18
The average time current curves and temperature rerating curve performance is affected by a number or variables, and these curves provided as guidance only. Customer must verify the performance in their application.
250R Series Specifications are subject to change without notice.
2 Electronics Designers Guide
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POLYFUSE(R) Resettable PTCs
Radial Leaded
Agency Specification Selection Guide For Telecom and Networking Applications
Product 250R120 250R145 250R180 Lightning ITU K.20/21/45 - 1.5kV 10/700s ITU K.20/21/45 - 4kV 10/700s* ITU K.20/21/45 - 1.5kV 10/700s ITU K.20/21/45 - 4kV 10/700s* Telcordia GR - 974 - 1.0kV 10/1000s Power Cross ITU K.20/21/45 - 230Vac, 10 ITU K.20/21/45 - 600Vac, 600 ITU K.20/21/45 - 230Vac, 10 ITU K.20/21/45 - 600Vac, 600 Telcordia GR - 974- 283Vac, 10A
*Devices should be independently evaluated and tested for use in any specific application
Protection Application Guide
Region/Specification Application *Access network equipment Remote terminal Repeaters WAN equipment Cross -connect Customer and IT equipment Analog modems ADSL, xDSL Phone sets, PBX systems Internet appliances POS terminals Central Office POTS/ISDN linecards T1/E1/J1 linecards ADSL/VDSL splitters CSU/DSU Device Selection 250R180 250R180T 250R145 250R145T 250R120 250R120T 250R180 250R180T 250R145 250R145T 250R120 250R120T 250R180 250R180T 250R145 250R145T 250R120 250R120T 250R180 250R180T 250R145 250R145T 250R120 250R120T 250R180 250R180T 250R145 250R145T 250R120 250R120T 250R080
South America/Asia/Europe ITU K.45
South America/Asia/Europe ITU K.21
South America/Asia/Europe ITU K.20
North America Telcordia GR-974 South America/Asia/Europe ITU K.20 North America Telcordia GR-1089 South America/Asia/Europe ITU K.20 and K.21
*Primary protection modules MDF modules Network interface
*Intrabuilding communication systems LAN, VOIP cards Local loop handsets LAN Intrabuilding power cross Protection LAN equipment, IP phone
*Resistance binned parts are recommended
250R Series Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com (c)2006 Littelfuse
POLYFUSE(R) Resettable PTCs
Radial Leaded
Soldering Parameters - Wave Soldering
Condition Peak Temp/ Duration Time > 220C Preheat 140C ~ 180C Storage Condition Wave Soldering 260C < 5 Sec 2 Sec ~ 20 Sec
Temperature (C)
260 220
Soldering
Cooling
180 Sec ~ 210 Sec 0C~35C < 70%RH
* Recommended soldering methods: heat element oven or N2 environment for lead-free. * Devices are designed to be wave soldered to the bottom side of the board. * Devices can be cleaned using standard industry methods and solvents. * This profile can be used for lead-free device Note: If soldering temperatures exceed the recommended profile, devices may not meet the performance requirements. Soldering Parameters - Solder Reflow
Condition Peak Temp/ Duration Time > 220C Preheat 160C ~ 190C Storage Condition Reflow 260C > 5 Sec 30 Sec ~ 60 Sec
190 160
Preheating
0
180 to 210
2 to 5 Time(s)
20-30
260 220 Temperature (C)
Soldering
Cooling
60 Sec ~ 90 Sec 0C~35C, < 70%RH
* Recommended reflow methods: IR, vapor phase oven, hot air oven, N2 environment for lead-free. * Devices are not designed to be wave soldered to the bottom side of the board. * Devices can be cleaned using standard industry methods and solvents. Note: If reflow temperatures exceed the recommended profile, devices may not meet the performance requirements. Physical Specifications
Lead Material Soldering Characteristics Insulating Material Device Labeling Tin-plated copper Solderability per MIL-STD-202, Method 208E Cured, flame retardant epoxy polymer meets UL94V-0 requirements. Marked with LF, voltage, current rating, and date code.
190 160
Preheating
0
60 to 90
30 to 60 Time(s)
120
Environmental Specifications
Operating/Storage Temperature Maximum Device Surface Temperature in Tripped State Passive Aging Humidity Aging -40C to +85C 125C 65C/85C, 1000 hours +85C, 85%R.H. 1000 hours MIL-STD-202F Method 107G +125C to -55C 10 times MIL-STD-202, Method 215F
Thermal Shock
Solvent Resistance
250R Series Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com (c)2006 Littelfuse
POLYFUSE(R) Resettable PTCs
Radial Leaded
Dimensions
A
Figure 1
C A
Figure 2
C
Marking
B
Marking
B
D
D
E
F
E
F
Figure
A B Inches Max. 0.39
Littelfuse Trademark
Figure 2
C D E mm
C
Part Number 250R080 250R080T 250R120 250R120-RA 250R120-RC 250R120-RF 250R120-R1
D 250R120-R2
Figure 1 Inches mm
Max. A 0.23 0.23 0.26 Max. C 5.8 5.8 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 9.5 9.5
mm Max. 9.9
080 XXXX
Inches Max. 0.18
Voltage Rating Current Rating Date Code (Contact Littelfuse for additional information)
mm Max. A 4.6 4.6 3.8 4.6 4.6 4.6 4.6 4.6 4.6 E 4.6 4.6 4.6 4.6 4.6 4.6
Inches Figure 2 Inches mm Min. 0.19
Littelfuse Trademark
Physical Characteristics Lead (dia) Inches 0.026 0.026 0.026 0.026 0.026 0.026 0.026 0.026 0.026 0.026 0.026 0.026 0.026 0.026 0.026 0.026 mm 0.65 0.65 0.65 0.65 0.65 0.65 0.65 0.65 0.65 0.65 0.65 0.65 0.65 0.65 0.65 0.65 Typ. 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1
F
Min. 4.7
120 XXXX
Typ. 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20
Material Sn/Cu Sn/Cu Sn/Cu Sn/Cu Sn/Cu Sn/Cu Sn/Cu Sn/Cu Sn/Cu Sn/Cu Sn/Cu Sn/Cu Sn/Cu Sn/Cu Sn/Cu Sn/Cu
Figure 1 1 2 2 2 2 2 2 2 2 2 2 2 2 1 1
0.39 0.43 0.43 0.43 0.43 0.43 0.43 0.43 0.43 0.43 0.43 0.43 0.43 0.47 0.47
B
9.9 250 11 11 11 11 11 11 11 11 11 11 11 11 12 12
0.18 0.15 0.18 0.18 0.18 0.18 0.18 0.18 0.18 0.18 0.18 0.18 0.18 0.18 0.18
D
0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19
4.7 250 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7
B
Marking
0.26 0.26 0.26 0.26 0.26 0.26
Marking 0.19 4.6
Voltage Rating Current Rating Date Code (Contact Littelfuse for additional information)
250R120-R3 250R120T 250R145 250R145-RA 250R145-RB 250R145T 250R180 250F180T
E
0.26 0.26 0.26 0.26 0.26 0.37 0.37
F
Part Marking System
250 250
Littelfuse Trademark
080 XXXX
Voltage Rating Current Rating Date Code (Contact Littelfuse for additional information)
Littelfuse Trademark
120 XXXX
Voltage Rating Current Rating Date Code (Contact Littelfuse for additional information)
250R Series Specifications are subject to change without notice.
5 Electronics Designers Guide
www.littelfuse.com (c)2006 Littelfuse
POLYFUSE(R) Resettable PTCs
Radial Leaded
Part Numbering System
250 R 120
- RA Z R
PACKAGING STYLE BLANK: Bulk R: Tape & Ammo
SERIES
QUANTITY CODE: M=1000 U=500 Z=1200 Rx: Resistance Range (x = A-Z or 1-9) [not applicable for all parts] T: PRE-TRIPPED DEVICE (OPTIONAL) I HOLD CURRENT CODE (SEE TABLE BELOW) R: RADIAL
PEAK VOLTAGE RATING
Packaging
I hold (A) 0.080 0.120 0.145 0.180 I hold Code 080 120 145 180 Packaging Option Bulk Tape and Ammo Bulk Tape and Ammo Bulk Tape and Ammo Bulk Tape and Ammo Quantity 500 1500 500 1200 500 1200 200 1000 Quantity & Packaging Codes U DR U ZR U ZR F MR
250R Series Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com (c)2006 Littelfuse

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