WSR www.vishay.com Vishay Dale Power Metal Strip® Resistors, Low Value (down to 0.001 ), Surface Mount FEATURES • Molded high temperature encapsulation • All welded construction of the Power Metal Strip® resistors are ideal for all types of curren t sensing, voltage division and pulse Available applications • Proprietary processing technique produce s extremely low resistance values (down to 0.001 ) Available • Sulfur resistance by construction that is unaffected by high sulfur environments Available DESIGN SUPPORT TOOLS click logo to get started • Solid metal nickel-chrome or manganese- copper alloy resistive element with low TCR Available (< 20 ppm/°C) Models Design Tools • Very low inductance 0.5 nH to 5 nH Available Available • Excellent frequency response to 50 MHz • Low thermal EMF (< 3 μV/°C) • AEC-Q200 qualified (1) • Material categorization: for definitions of complianc e please see www.vishay.com/doc?99912 Notes • This datasheet provides information about parts that are RoHS-compliant and / or parts that are non-RoHS-compliant. For example, parts with lead (Pb) terminations are not RoHS-compliant. Please see the information / tables in this datasheet for details • Follow link to Overview of Automotive Grade Products for more details: www.vishay.com/doc?49924 (1) Flame retardance test may not be applicable to some resistor technologies STANDARD ELECTRICAL SPECIFICATIONS POWER RATING RESISTANCE VALUE RANGE WEIGHT GLOBAL SIZE P  (typical) MODEL 70 °C W Tol. ± 0.5 % Tol. ± 1.0 % g/1000 pieces WSR2 4527 2.0 0.005 to 1.0 0.001 to 1.0 440 WSR3 4527 3.0 (1) 0.005 to 0.2 0.001 to 0.2 440 Notes • Part marking: DALE, model, value, tolerance, date code (1) The WSR3 requires a minimum of 1050 sq. mil. circuit traces connecting to the recommended solder pad GLOBAL PART NUMBER INFORMATION Global Part Numbering example: WSR25L000FEA (visit www.vishay.net Vishay Dale parts numbering manual for all options) W S R 2 5 L 0 0 0 F E A GLOBAL MODEL RESISTANCE VALUE (1) TOLERANCE CODE PACKAGING CODE (2) SPECIAL (3) WSR2 L = m* D = ± 0.5 % EA = lead (Pb)-free, tape/reel (dash number) WSR3 R = decimal F = ± 1.0 % EK = lead (Pb)-free, bulk (up to 2 digits) 5L000 = 0.005  J = ± 5.0 % from 1 to 99 as TA = tin/lead, tape/reel (R86) R0100 = 0.01  applicable BA = tin/lead, bulk (B43) * Use “L” for resistance values < 0.01  Notes (1) WSR Marking (www.vishay.com/doc?30327) (2) Packaging code: EB (lead (Pb)-free) and TB (tin / lead) are non-standard packaging codes designating 1000 piece reels. These non-standar d packaging codes are identical to our standard EA (lead (Pb)-free) and TA (tin / lead), except that they have a package quantity of 1000 pieces (3) Follow link for customization capabilities: www.vishay.com/doc?48163 Revision: 09-Jan-2019 1 Document Number: 30101 For technical questions, contact: ww2bresistors@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

WSR www.vishay.com Vishay Dale TECHNICAL SPECIFICATIONS PARAMETER UNIT WSR2 AND WSR3 RESISTOR CHARACTERISTICS ± 75 for 0.010  to 1.0  ± 110 for 0.005  to 0.0099  Temperature coefficient ± 300 for 0.004  to 0.0049  TCR measured from -55 °C to ppm/°C 150 °C ± 450 for 0.003  to 0.0039  ± 600 for 0.002  to 0.0029  ± 750 for 0.001  to 0.0019  Element TCR ppm/°C < 20 Dielectric withstanding voltage V > 500 AC Insulation resistance  > 109 Operating temperature range °C -65 to +275 Maximum working voltage V (P x R)1/2 DIMENSIONS in inches (millimeters) W H I b W1 T a L Notes • 3D models available: www.vishay.com/doc?30336 • Surface mount solder profile recommendations: www.vishay.com/doc?31052 DIMENSIONS SOLDER PAD DIMENSIONS MODEL L H T W W a b l 1 0.455 ± 0.032 WSR2,  0.095 ± 0.005 0.100 ± 0.010 0.275 ± 0.005 0.215 ± 0.005 0.155 0.230 0.205 (11.56 ± WSR3 (2.41 ± 0.127) (2.54 ± 0.254) (6.98 ± 0.127) (5.46 ± 0.127) (3.94) (5.84) (5.21) 0.813) Note • Sensing locations are based on the construction of the part; terminals are wrapped from the outside to underneath. These options place th e sensing location nearest the temperature stable resistance element, which minimizes contact resistance and optimizes TCR TYPICAL SENSING LAYOUT a a b c l c a b c l 0.155 0.230 0.020 0.205 (3.94) (5.84) (0.51) (5.21) Revision: 09-Jan-2019 2 Document Number: 30101 For technical questions, contact: ww2bresistors@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

WSR www.vishay.com Vishay Dale DERATING PULSE CAPABILITY % 120 n wer i 100 click to get started LLLLL YY o N P OO ated 80 O S EE SS R PP RR 60 U P E V 40 TI AAA R T S 20 U LL LL II 0 - 65 - 25 25 75 125 175 225 275 Ambient Temperature °C 70 www.vishay.com/resistors/power-metal-strip-calculator PERFORMANCE TEST LIMITS TEST CONDITIONS OF TEST WSR2 WSR3 Thermal shock -55 °C to +150 °C, 1000 cycles, 15 min at each extreme ± 0.5 % + 0.0005  ± 0.5 % + 0.0005  WSR2: 5x rated power for 5 s Short time overload ± 0.5 % + 0.0005  ± 2.0 % + 0.0005  WSR3: 4x rated power for 5 s Low temperature storage -65 °C for 24 h ± 0.5 % + 0.0005  ± 0.5 % + 0.0005  High temperature 1000 h at +275 °C ± 1.0 % + 0.0005  ± 1.0 % + 0.0005  exposure Bias humidity +85 °C, 85 % RH, 10 % bias, 1000 h ± 0.5 % + 0.0005  ± 0.5 % + 0.0005  Mechanical shock 100 g’s for 6 ms, 5 pulses ± 0.5 % + 0.0005  ± 0.5 % + 0.0005  Vibration Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h ± 0.5 % + 0.0005  ± 0.5 % + 0.0005  Load life 1000 h at rated power, +70 °C, 1.5 h “ON”, 0.5 h “OFF” ± 1.0 % + 0.0005  ± 2.0 % + 0.0005  Resistance to solder heat +260 °C solder, 10 s to 12 s dwell, 25 mm/s emergence ± 0.5 % + 0.0005  ± 0.5 % + 0.0005  MIL-STD-202, method 106, 0 % power, 7a and 7b not Moisture resistance ± 0.5 % + 0.0005  ± 0.5 % + 0.0005  required PACKAGING (1) REEL MODEL TAPE WIDTH DIAMETER PIECES/REEL CODE WSR2 and WSR3 24 mm/embossed plastic 330 mm/13" 1500 EA Notes • Embossed Carrier Tape per EIA-481 (1) Additional packaging details at www.vishay.com/doc?20051 Revision: 09-Jan-2019 3 Document Number: 30101 For technical questions, contact: ww2bresistors@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

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