Features ■ ■ ■ ■ ■ Matched pair of resistors plus thermal fuse Power line fault/lightning protection to BELLCORE GR-1089 Typical application is secondary protection on telecom line cards UL 497A recognition ■ Thermal fuse links Bourns TISP® products are recommended for the overvoltage section of the protection circuit 4B04B-524-RC - Line Protection Network Matched Pair of Resistors plus Thermal Fuse Electrical Characteristics Product Dimensions Resistance Values (R1 = R2)...............................................15Ω - 60Ω Resistance Tolerance >34Ω .........................................................................................±2% <34Ω .........................................................................................±5% TCR ...................................................................................100ppm/°C Ratio Tolerance >34Ω ......................................................................................±0.5% <34Ω .........................................................................................±2% Temperature Range.....................................................-40ºC to +85ºC 51.05 MAX. (2.010) 12.19 (.480) 1 8.89 (.350) Physical Characteristics Body Style ..........................................................Open Frame SIP Substrate Material ...................................................96% Alumina Lead Frame Material .................................Copper, solder coated Flammability...............................................Conforms to UL94V-0 Functional Characteristics (per Bellcore GR-1089) 3.05 (.120) MAX. 4 11 0.36 (.014) MAX. 3.43 ± .381 (.135 ± .015) 17.78 (.700) 7.62 (.300) 14 DIMENSIONS: MM (INCHES) Electrical Schematic First Level Lightning Surge Resistors will remain within tolerance after testing. R1 1000 Volts Peak, 100 Amp Peak Current, Max. Rise/Min. Decay Time 10x1000µs, Number of Pulses ..............................25 each resistor each polarity 25 simultaneous each polarity 2500 Volts Peak, 500 Amp Peak Current, Max. Rise/Min. Decay Time 2x10µs, Number of Pulses .............................10 simultaneous each polarity 1 R2 4 11 14 Break Open Time 100 First Level AC Power Fault Resistors will remain within tolerance after testing. 50 Vrms, .33 Amp Short Circuit Current, Duration...........................................................................15 minutes 100 Vrms, .17 Amp Short Circuit Current, Duration...........................................................................15 minutes TIME (Seconds) 10 SINGLE RESISTOR 1 BOTH RESISTORS SIMULTANEOUS 0.1 600 Vrms, 1.0 Amp Short Circuit Current, Duration ........................................................60 One-second pulses 0.01 10 Second Level Lightning Surge Resistor package must fail safely causing no fire, electrical, or framentation hazard. 1000 10000 Power (Watts) 5000 Volts Peak, 500 Amp Peak Current, Max. Rise/Min. Decay Time 2x10µs, Number of Pulses ...............................1 simultaneous each polarity How To Order 4B 04 B - 524 - RC Model (4B = Open Frame) Second Level AC Power Fault Resistor package must fail safely causing no fire, electrical, or framentation hazard. Number of Pins Physical Configuration Electrical Configuration • 524 = Matched Pair of Resistors plus Thermal Fuse Standard Resistance Values Resistance (ohms) Resistance Code 20 40 50 200 400 500 Specifications are subject to change without notice. 100 Resistance Code • First 2 digits are significant • Third digit represents the number of zeros to follow REV. A COPYRIGHT© 2001, BOURNS, INC. LITHO IN U.S.A. IP 7/01 N0XXX