Features ■ ■ ■ Overvoltage/lightning protection to ITU-T K.20 Standard “off-the-shelf” design Typical application is secondary protection on telecom line cards 4A12P-506-500 - Surge Line Protection Module Matched Pair of Resistors plus Thermal Fuse Product Dimensions Electrical Characteristics 32.81 MAX. (1.292) Resistance Values (R1 = R2) ........................................................50 Ω Resistance Tolerance ..................................................................±1 % TCR ..................................................................................100 ppm/°C Ratio Tolerance ........................................................................±0.5 % Power Dissipation (per resistor) @ 25 % .......................................2 W Temperature Range...................................................-40 ºC to +85 ºC 12.70 14.59 (.500) (.575) 1 2 Physical Characteristics Body Style .............................................Dual in line SMD - twin pack Substrate Material ........................................................96 % Alumina Lead Frame Material........................................Copper, solder coated Flammability .....................................................Conforms to UL94V-0 Processability................Unit is only suitable for no-clean processing Convection Reflow...................Unit will withstand 260 °, 20 seconds Packaging ..................16 “ diameter reels, 44mm tape, 250 pcs./reel 4 8 10 11 3.72 (.146) 2.54 ± .13 (.100 ± .005) 10.16 ± .13 (.400 ± .005) 5.08 ± .13 (.200 ± .005) 5.28 ± .013 (0.208 ± .005) Functional Characteristics Lightning Surge Test ...........................................10 x 700 µSec, 1 KV Power Induction ...................................................................300 Vrms Power Contact .....................................................................220 Vrms 13.40 ± .25 (.527 ± .010) 2.54 ± .25 (.100 ± .010) How To Order 4A 12 P - 506 - 500 Model (4A = Surface Mount) 7.11 ± .25 (0.280 ± .010) Number of Pins DIMENSIONS: Physical Configuration MILLIMETERS (INCHES) Electrical Configuration 506 = Matched Pair of Resistors plus Thermal Fuse Electrical Schematic Resistance Code • 500 = 50 Ω 1 22 2 21 R1 R4 4 19 8 15 Reliable Electronic Solutions R2 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 R3 10 13 11 12 09/02 Specifications are subject to change without notice. COPYRIGHT© 2002, BOURNS, INC. LITHO IN U.S.A. 09/02 e/L0211