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MODEL BSR SERIES
Thick Film 2512 Surge Resistors
NEW PRODUCT
FEATURES
* 1.2/50 microsecond 250V pulse * 10/700 microsecond 250V pulse
APPLICATIONS
* Nickel barrier terminations * Double glass passivation
Telephone lines are often subject to a variety of voltage disturbances which fall into two main categories short duration, high voltage transients caused by lightning strikes and longer duration, over voltages which may be caused by direct connection to main power lines. The advent of electronic switching has meant that sophisticated methods of protection against these two fault conditions has to be incorporated to ensure that potential damage is limited. The two types of protection are: primary, which attempts to deal with the bulk of the energy from a fast transient, particularly lightning strikes and power crosses and secondary, which provides a further level of protection to prevent damage to sensitive electronic circuits. The possibility of disturbances in the line is dependent on the environment of the equipment installation. In the case of a PABX, where the telephone line, terminal equipment and the line interface are all installed in the same building, the possibility of induced lightning transients is greatly reduced and the opportunity for damage induced by direct connection to mains is low.
For these reasons the degree of protection is much less than for equipment connected outside the building where the risk increases dramatically. BI Technologies is involved in secondary protection for all types of environment. The BSR Series has been specifically designed for PABX where cost is of paramount importance. For central switches, the tip and ring resistors are expected to perform identically to maintain the correct resistance for a balanced line system. Both resistors are therefore generally produced on a common substrate, which may be through hole or surface mount, and perform close to one another under all foreseeable fault conditions in both common and differential modes. For PABX, tracking is not required because an individual resistor is used which normally runs at low power yet has the ability to withstand considerable power for long periods and has good characteristics under high voltage transient conditions. The BSR Series is a surface mount chip resistor in a standard 2512 package which utilizes special resistor film to handle the high voltage with Contact factory for custom surge resistors meeting Bellcore testing conditions.
Continued . . .
5
Specifications subject to change without notice.
5-7
Model BSR Series
APPLICATIONS
sophisticated laser trimming to prevent flash over. In the event of a very high voltage pulse the resistor will go open-circuit preventing damage to surrounding components or the printed circuit board. Two units are required for each incoming line to protect both tip and ring individually and collectively. The resistor is made from nonflammable material.
ELECTRICAL
The BSR Series is manufactured in BI's highly automated production facility in Glenrothes, Scotland, which also produces standard 2512 chip resistors and a wide range of chip resistor networks, R/C networks as well as gull wing 14 and 16 lead resistor networks, all of which are used on the PABX line card and in many other areas of electronics.
Surge Capability, Max. Standard Resistance Range, Ohms Standard Resistance Tolerances Operating Temperature Range Temperature Coefficient of Resistance, Max. Power Ratings, Watts, at 70C (See Note ) Operating Voltage, Max. Note : For 2 watts limit part temperature to +155 C
ENVIRONMENTAL
1.2 / 50 s, 250 V; 10 / 700 s, 250 V (R 5%+0.1) 0.05 to 10000 Ohms 5%, 10%, 20% Optional : 1%, 2% -55C to +125C 100ppm/C above 10 Ohms 1 and 2 100 V dc or PR whichever is less
Short Time Overload, Max. Temperature Cycling Moisture Resistance Load Life Resistance to Solder Heat
2.5 x rated voltage (R 1%+0.1 ) -55C to +125C, 5 cycles (R 5%+0.1 ) 1,000 hours at 40C, 95% RH (R 3%+0.1 ) 1,000 hours at 70C + Rated Voltage, Max. (R 3%+0.1 ) 260C for 10 sec. (R 5%+0.1 )
CONSTRUCTION
;; ;; ;; ;; ;; ;;
Glass Passivation: Glass Protective Coating
;;;;; ;;;;;
Substrate: Alumina
Resistor: Ruthenium Oxide
90/10 Tin-Lead Solder Plating
Nickel Barrier
Thick Film Conductor
5-8
Model BSR Series
SURGE WAVEFORM DEFINITION
1P Voltage in Percent of Peak Value 0.9P Impulse Wave Bellcore GR 1089 Example: 10 x 700 sec. wave form definition A: Front Time (T1-T0) = 10 sec. B: Duration (T2-T0) = 700 sec. 0.5P
0.1P T0 a A B Note: Higher pulse capability can be achieved with untrimmed resistors b T1 T2
OUTLINE DIMENSIONS (Inch/mm)
5
.028.008 .702.0 (2 Places)
.028.008 .702.0
;;; ; ;;; ; 100 ;;; ; ; ;;;;; ;;; ;;;; ;;
Typical Part Marking (Resistance Code 100)
.248.008 6.302.0
.126.008 3.202.0
.023.004 .601.0
.028.008 .702.0
5-9
Model BSR Series
PACKAGING (Inch/mm)
+.004 -.000 Dia. +0.10 1.50 -0.00 .059
.079.002 2.010.05
.157.004 4.000.10
.827.031 Dia. 21.00.79
.512.020 Dia. 13.00.50
E D B C
+0.04 - 0.00 Dia. +1.00 59.9 - 0.00 2.36
A
.157.004 4.000.10
.079.020 2.010.50
.016 Max. 0.41
;;;;;;; ;
Upper-Surface Covering Tape .039 Max. .991 Cavity For Resistor 7" Reel Diameter - 4K Per Reel Dim. B Dim. C Dim. D Dim. E .069.004 1.750.10 .266.004 .472.008 .217.002 6.760.10 11.990.20 5.510.05
+0.00 - 0.12 Dia. +0.00 180.1 - 3.05 Label: Includes Part Number, Lot Number and Quantity 7.09
.354.012 8.990.30
.449.039 11.4.991
Dim. A .138.004 3.510.10
ORDERING INFORMATION
BSR
Model Series Power Rating
1
120
J
E
Packaging: E = Embossed Tape Tolerance Code: F = 1% Tol. G = 2% Tol. J = 5% Tol. K = 10% Tol. M = 20% Tol.
Resistance Code: 0.050 Ohms : R050 1 Ohm : 1R0 10 Ohms and above First two digits are significant. Third digit denotes number of trailing zeroes.
5-10
Model BSR Series

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