WSK Vishay Dale Power Metal Strip® Resistors, Low Value (down to 0.001 Ω), Surface Mount, 4-Terminal FEATURES • 4-Terminal design allows for 1 % tolerance down to 0.001 Ω and 0.5 % tolerance down to 0.003 Ω • 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 Ω) • 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 RANGE Ω GLOBAL MODEL POWER RATING P70 °C W ± 0.5 % ± 1.0 % WSK2512 1.0 0.003 to 0.025 0.001 to 0.025 Note • Part Marking: DALE, Value, Tolerance; due to resistor size limitations some resistance values will be marked with only the resistance value TECHNICAL SPECIFICATIONS PARAMETER UNIT WSK2512 ppm/°C 0.001 Ω to 0.0029 Ω = ± 250 0.003 Ω to 0.0049 Ω = ± 75 0.005 Ω to 0.025 Ω = ± 35 Operating Temperature Range °C - 65 to + 170 Maximum Working Voltage V (P x R)1/2 Weight/1000 pieces g 63.6 Temperature Coefficient GLOBAL PART NUMBER INFORMATION NEW GLOBAL PART NUMBERING: 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 = mΩ* R = Decimal 5L000 = 0.005 Ω R0100 = 0.01 Ω * Use “L” for resistance values < 0.01 Ω 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) HISTORICAL PART NUMBERING: WSK2512 0.005 Ω 1 % R86 (WILL CONTINUE TO BE ACCEPTED) WSK2512 0.005 Ω 1% R86 HISTORICAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING * 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 20 For technical questions, contact: [email protected] Document Number: 30108 Revision: 01-Jul-09 WSK Power Metal Strip® Resistors, Low Value (down to 0.001 Ω), Surface Mount, 4-Terminal Vishay Dale DIMENSIONS L W H B b T A l d c a e DIMENSIONS in inches [millimeters] MODEL RESISTANCE RANGE Ω 0.001 to 0.0049 WSK2512 0.005 to 0.025 MODEL W H T A B 0.250 ± 0.010 [6.35 ± 0.254] 0.250 ± 0.010 [6.35 ± 0.254] 0.125 ± 0.010 [3.18 ± 0.254] 0.125 ± 0.010 [3.18 ± 0.254] 0.025 ± 0.010 [0.635 ± 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] 0.030 ± 0.010 [0.762 ± 0.254] 0.020 ± 0.010 [0.508 ± 0.254] 0.020 ± 0.010 [0.508 ± 0.254] b 0.130 [3.30] Rated Power in % WSK2512 a 0.125 [3.18] L SOLDER PAD DIMENSIONS in inches [millimeters] c d e 0.030 [0.76] 0.020 [0.51] 0.055 [1.40] I 0.065 [1.65] 120 100 80 60 40 20 0 - 65 - 55 - 25 Derating 0 25 50 75 100 125 150 170 70 Ambient Temperature °C PERFORMANCE TEST Thermal Shock Short Time Overload Low Temperature Storage 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 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 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR ± (1.0 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR ± (1.0 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR PACKAGING MODEL WSK2512 REEL TAPE WIDTH 12 mm/Embossed Plastic DIAMETER 178 mm/7" RIECES/REEL 2000 CODE R86 Note • Embossed carrier tape per EIA-481-1A Document Number: 30108 Revision: 01-Jul-09 For technical questions, contact: [email protected] www.vishay.com 21 Legal Disclaimer Notice Vishay Disclaimer All product specifications and data are subject to change without notice. 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 herein or in any other disclosure relating to any product. Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners. Document Number: 91000 Revision: 18-Jul-08 www.vishay.com 1