Features
ꢀ Overvoltage/lightning protection to ITU-T K.20
ꢀ Standard “off-the-shelf” design
4B08B-503
-500
97
40
ꢀ Typical application is secondary protection on telecom line cards
4B08B-503-RC - Surge Line Protection Module
Electrical Characteristics
Product Dimensions
Resistance Values (R1 = R2) .......................................50 & 100 Ω
Resistance Tolerance ........................................................... 2 ꢀ
TCR............................................................................100 ppm/°C
Ratio Tolerance..................................................................... 1 ꢀ
Power Dissipation (per resistor) @ 25 °C ................................2 W
Temperature Range ..........................................-55 ºC to +125 ºC
38.10
(1.500)
MAX.
0.62
(.025)
MAX.
11.05
(.435)
MAX.
Environmental Characteristics
1
2
5
6
10 11
14 15
3.43 .38
(.135 .015)
0.36
(.014)
MAX.
Tests per MIL-STD-202..................................................∆ R max.
Resistance to Solvents .........................No marking deterioration
Resistance to Solder Heat................................................ 0.5 Ω
Solderability.......................................................>95 ꢀ Coverage
Insulation Resistance .........................10 MΩ min. (isolated pins)
Bias Humidity Test...................................50 V / 85 ꢀ RH / 85 °C
10.16
(.400)
7.62
(.300)
.51
(.020)
1.27
(.050)
7.62
(.300)
2.54
(.100)
MILLIMETERS
(INCHES)
DIMENSIONS:
Physical Characteristics
Body Style..........................................................Open Frame SIP
Substrate Material..................................................96 ꢀ Alumina
Lead Frame Material .................................Copper, solder coated
Flammability...............................................Conforms to UL94V-0
Electrical Schematic
Functional Characteristics
F1
1
R1
5
R2
10
F2
Lightning Surge Test ....................................10 x 700 µSec, 1 KV
Power Induction.............................................................300 Vrms
Power Contact...............................................................220 Vrms
2
6
11
14
15
How To Order
4B 08 B - 503 - XXX
Model
(4B = Open Frame)
Number of Pins
Physical Configuration
Electrical Configuration
503 = Matched pair of resistors plus thermal fuse
Resistance Code
• 500 = 50 Ω
• 101 = 100 Ω
Reliable Electronic Solutions
Asia-Pacific: TEL +886- (0)2 25624117 • FAX +886- (0)2 25624116
Europe: TEL +41-41 7685555 • FAX +41-41 7685510
North America: TEL +1-909 781-5500 • FAX +1-909 781-5700
bourns.com
09/02
COPYRIGHT© 2002, BOURNS, INC. LITHO IN U.S.A. 09/02 e/L0211
Specifications are subject to change without notice.
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