*R oH VE S CO AV R M AI SIO PL LA N IA BL S NT E Features ■ ■ ■ ■ RoHS compliant* versions available Overvoltage/lightning protection to ITU-T K.20 Standard “off-the-shelf” design Typical application is secondary protection on telecom line cards 4B08B-503-RC - Surge Line Protection Module Electrical Characteristics 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 Environmental Characteristics 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 Physical Characteristics Body Style..........................................................Open Frame SIP Substrate Material ..................................................96 % Alumina Lead Frame Material .................................Copper, solder coated Flammability...............................................Conforms to UL94V-0 Functional Characteristics Lightning Surge Test ....................................10 x 700 µSec, 1 KV Power Induction.............................................................300 Vrms Power Contact...............................................................220 Vrms Product Dimensions 38.10 MAX. (1.500) MAX. 0.62 (.025) MAX. 11.05 (.435) 1 2 3.43 ± .38 (.135 ± .015) 1.27 (.050) 5 6 10 11 10.16 (.400) 7.62 (.300) 7.62 (.300) DIMENSIONS: 14 15 .51 (.020) 0.36 (.014) MAX. 2.54 (.100) MILLIMETERS (INCHES) Electrical Schematic F1 1 R1 2 5 R2 6 10 F2 11 14 15 How To Order 4B 08 B - 503 - XXX LF Model (4B = Open Frame) Number of Pins Physical Configuration Electrical Configuration 503 = Matched pair of resistors plus thermal fuse Asia-Pacific: TEL +886- (0)2 25624117 FAX +886- (0)2 25624116 Europe: TEL +41-41 7685555 FAX +41-41 7685510 Resistance Code • 500 = 50 Ω • 101 = 100 Ω RoHS Compliant Option Blank = Standard Product LF = RoHS Compliant Product The Americas: TEL +1-951 781-5500 FAX +1-951 781-5700 www.bourns.com *RoHS Directive 2002/95/EC Jan 27, 2003 including Annex. Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications. REV. 06/11