WSK Vishay Dale Power Metal Strip(R) Resistors, Low Value (down to 0.001 ), Surface Mount, 4-Terminal FEATURES * 4-Terminal design allows for 1 % tolerance down to 0.001 and 0.5 % tolerance down to 0.003 * Ideal for all types of precision current sensing, voltage division and pulse applications including switching and linear power supplies, instruments, power amplifiers * Proprietary processing technique produces extremely low resistance values (down to 0.001 ) * All welded construction * Solderable terminations * Solid metal nickel-chrome or manganese-copper alloy resistive element with low TCR (< 20 ppm/C) * Very low inductance 0.5 nH to 5 nH * Excellent frequency response to 50 MHz * Compliant to RoHS Directive 2002/95/EC STANDARD ELECTRICAL SPECIFICATIONS RESISTANCE VALUE RANGE GLOBAL MODEL SIZE POWER RATING P70 C W Tol. 0.5 % Tol. 1.0 % WEIGHT (typical) g/1000 pieces WSK2512 2512 1.0 0.001 to 0.025 0.001 to 0.025 63.6 Note * Part marking: Value, tolerance; due to resistor size limitations some resistance values will be marked with only the resistance value. TECHNICAL SPECIFICATIONS PARAMETER UNIT RESISTOR CHARACTERISTICS ppm/C 250 for 0.001 to 0.0029 , 75 for 0.003 to 0.0049 , 35 for 0.005 to 0.025 Operating temperature range C - 65 to + 170 Maximum working voltage V (P x R)1/2 Temperature coefficient GLOBAL PART NUMBER INFORMATION Global Part Numbering example: WSK25125L000FTA (preferred part numbering format) W S K 2 5 1 2 5 L 0 0 0 F T A GLOBAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING CODE SPECIAL WSK2512 L = m* R = Decimal 5L000 = 0.005 R0100 = 0.01 D = 0.5 % F = 1.0 % EA = Lead (Pb)-free, tape/reel EK = Lead (Pb)-free, bulk (Dash number) (up to 2 digits) From 1 to 99 as applicable TA = Tin/lead, tape/reel (R86) BA = Tin/lead, bulk (B43) * Use "L" for resistance values < 0.01 Historical Part Numbering example: WSK2512 0.005 1 % R86 (will continue to be accepted) WSK2512 0.005 1% R86 HISTORICAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING CODE * Pb containing terminations are not RoHS compliant, exemptions may apply ** Please see document "Vishay Material Category Policy": www.vishay.com/doc?99902 www.vishay.com 392 For technical questions, contact: ww2bresistors@vishay.com Document Number: 30108 Revision: 10-Dec-10 WSK Power Metal Strip(R) Resistors, Low Value (down to 0.001 ), Surface Mount, 4-Terminal Vishay Dale DIMENSIONS in inches (millimeters) L W H B b T A l d c a e DIMENSIONS MODEL RESISTANCE RANGE 0.001 to 0.0049 WSK2512 0.005 to 0.025 L W H T A B 0.250 0.010 (6.35 0.254) 0.125 0.010 (3.18 0.254) 0.025 0.010 (0.635 0.254) 0.087 0.010 (2.21 0.254) 0.047 0.010 (1.19 0.254) 0.030 0.010 (0.762 0.254) 0.020 0.010 (0.508 0.254) SOLDER PAD DIMENSIONS MODEL a b c d e l 0.130 (3.30) 0.090 (2.29) 0.130 (3.30) 0.030 (0.76) 0.020 (0.51) 0.055 (1.40) 0.065 (1.65) 0.145 (3.68) Rated Power in % WSK2512 RESISTANCE RANGE 0.001 to 0.0049 0.005 to 0.025 120 100 80 60 40 20 0 - 65 - 55 - 25 0 25 Derating 50 75 100 125 150 170 70 Ambient Temperature C PERFORMANCE TEST Thermal shock Short time overload Low temperature operation High temperature exposure Bias humidity Mechanical shock Vibration Load life Resistance to solder heat Moisture resistance CONDITIONS OF TEST - 55 C to + 150 C, 1000 cycles, 15 min at each extreme 5 x rated power for 5 s - 65 C for 24 h 1000 h at + 170 C + 85 C, 85 % RH, 10 % bias, 1000 h 100 g's for 6 ms, 5 pulses Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h 1000 h at rated power, + 70 C, 1.5 h "ON", 0.5 h "OFF" + 260 C solder, 10 s to 12 s dwell, 25 mm/s emergence MIL-STD-202, method 106, 0 % power, 7a and 7b not required TEST LIMITS (0.5 % + 0.0005 ) R (0.5 % + 0.0005 ) R (0.5 % + 0.0005 ) R (1.0 % + 0.0005 ) R (0.5 % + 0.0005 ) R (0.5 % + 0.0005 ) R (0.5 % + 0.0005 ) R (1.0 % + 0.0005 ) R (0.5 % + 0.0005 ) R (0.5 % + 0.0005 ) R PACKAGING MODEL WSK2512 TAPE WIDTH 12 mm/embossed plastic REEL DIAMETER 178 mm/7" PIECES/REEL 2000 CODE EA Note * Embossed Carrier Tape per EIA-481. Document Number: 30108 Revision: 10-Dec-10 For technical questions, contact: ww2bresistors@vishay.com www.vishay.com 393 Legal Disclaimer Notice Vishay Disclaimer ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, "Vishay"), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other disclosure relating to any product. Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product. 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