WSR Vishay Dale Power Metal Strip® Resistors, Low Value (down to 0.001 Ω), Surface Mount FEATURES • Molded high temperature encapsulation Pb-free • Ideal for all types of current sensing, voltage Available division and pulse applications including switching and linear power supplies, e2 instruments, power amplifiers • Proprietary processing technique produces extremely low resistance values (down to RoHS* COMPLIANT 0.001 Ω) • All welded construction • Solid metal Nickel-Chrome or Manganese-Copper alloy resistive element with low TCR (< 20 ppm/°C) • Solderable terminations • Very low inductance 0.5 nH to 5 nH • Excellent frequency response to 50 MHz • Low thermal EMF (< 3 µV/°C) • Lead (Pb)-free version is RoHS compliant STANDARD ELECTRICAL SPECIFICATIONS GLOBAL MODEL POWER RATING P70 °C W 2.0 3.0 (1) SIZE RESISTANCE RANGE Ω ± 0.5 % ± 1.0 % 0.01 - 1.0 0.001 - 1.0 0.01 - 0.2 0.001 - 0.2 WSR2 4527 WSR3 4527 Note (1) The WSR3 requires a minimum of 1050 sq. mil. circuit traces connecting to the recommended solder pad • Part Marking: DALE, Model, Value, Tolerance, Date Code TECHNICAL SPECIFICATIONS PARAMETER UNIT Temperature Coefficient WSR2 & WSR3 0.005 Ω - 0.0099 Ω = ± 110 0.010 Ω - 1.0 Ω = ± 75 > 500 > 109 - 65 to + 275 (P x R)1/2 440 ppm/°C Dielectric Withstanding Voltage Insulation Resistance Operating Temperature Range Maximum Working Voltage Weight/1000 pieces (typical) VAC Ω °C V g GLOBAL PART NUMBER INFORMATION NEW GLOBAL PART NUMBERING: WSR25L000FTA (PREFERRED PART NUMBERING FORMAT) W GLOBAL MODEL WSR2 WSR3 S R 2 5 L VALUE L = mΩ* R = Decimal 5L000 = 0.005 Ω R0100 = 0.01 Ω * use “L” for resistance values < 0.01 Ω 0 0 0 TOLERANCE D = ± 0.5 % F = ± 1.0 % J = ± 5.0 % F T A PACKAGING EA = Lead (Pb)-free, tape/reel EK = Lead (Pb)-free, bulk TA = Tin/lead, tape/reel (R86) BA = Tin/Lead, bulk (B43) SPECIAL (Dash Number) (up to 2 digits) From 1 - 99 as applicable HISTORICAL PART NUMBER EXAMPLE: WSR2 0.005 Ω 1 % R86 (WILL CONTINUE TO BE ACCEPTED) WSR2 0.005 Ω 1% R86 HISTORICAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING * Pb containing terminations are not RoHS compliant, exemptions may apply www.vishay.com 30 For technical questions, contact: [email protected] Document Number: 30101 Revision: 26-Mar-07 WSR Power Metal Strip® Resistors, Low Value (down to 0.001 Ω), Surface Mount Vishay Dale DIMENSIONS DIMENSIONS in inches [millimeters] MODEL L H W WSR2 WSR3 W1 T W W1 0.100 ± 0.010 [2.54 ± 0.254] 0.275 ± 0.005 [6.98 ± 0.127] 0.215 ± 0.005 [5.46 ± 0.127] H 0.455 ± 0.032 0.095 ± 0.005 [11.56 ± 0.813] [2.41 ± 0.127] T L I b SOLDER PAD DIMENSIONS in inches [millimeters] MODEL WSR2 WSR3 Rated Power in % a a b l 0.155 [3.94] 0.230 [5.84] 0.205 [5.21] 120 100 80 60 40 20 0 - 65 - 25 25 Derating 75 125 70 175 225 275 Ambient Temperature °C PERFORMANCE TEST TEST LIMITS CONDITIONS OF TEST WSR2 WSR3 Thermal Shock - 55 °C to + 150 °C, 1000 cycles, 15 min at each extreme ± (0.5 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR Short Time Overload WSR2: 5 x rated power for 5 s WSR3: 4 x rated power for 5 s ± (0.5 % + 0.0005 Ω) ΔR ± (2.0 % + 0.0005 Ω) ΔR Low Temperature Storage - 65 °C for 24 h ± (0.5 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR High Temperature Exposure 1000 h at + 275 °C ± (1.0 % + 0.0005 Ω) ΔR ± (1.0 % + 0.0005 Ω) ΔR Bias Humidity + 85 °C, 85 % RH, 10 % Bias, 1000 h ± (0.5 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR Mechanical Shock 100 g’s for 6 ms, 5 pulses ± (0.5 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR Vibration Frequency varied 10 to 2000 Hz in 1 min, 3 directions, 12 h ± (0.5 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR Load Life 1000 h at rated power, + 70 °C, 1.5 h “ON”, 0.5 h “OFF” ± (1.0 % + 0.0005 Ω) ΔR ± (2.0 % + 0.0005 Ω) ΔR Resistance to Solder Heat + 260 °C Solder, 10 - 12 s dwell, 25 mm/s emergence ± (0.5 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR Moisture Resistance MIL-STD-202 Method 106, 0 % power, 7a and 7b not required ± (0.5 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR PACKAGING MODEL WSR2 and WSR3 REEL TAPE WIDTH DIAMETER PIECES/REEL CODE 24 mm/Embossed Plastic 330 mm/13" 1500 EA Note • Embossed Carrier Tape per EIA-481-2 Document Number: 30101 Revision: 26-Mar-07 For technical questions, contact: [email protected] www.vishay.com 31 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