WSR www.vishay.com Vishay Dale Power Metal Strip(R) Resistors, Low Value (down to 0.001 ), Surface Mount FEATURES * Molded high temperature encapsulation * All welded construction of the Power Metal Strip(R) resistors are ideal for all types of current sensing, voltage division and pulse applications * Proprietary processing technique produces extremely low resistance values (down to 0.001 ) Available Available * Sulfur resistance by construction that is unaffected by high sulfur environments DESIGN SUPPORT TOOLS Models Available * Solid metal nickel-chrome or manganesecopper alloy resistive element with low TCR (< 20 ppm/C) click logo to get started Design Tools Available Available * Very low inductance 0.5 nH to 5 nH Available * Excellent frequency response to 50 MHz * Low thermal EMF (< 3 V/C) * AEC-Q200 qualified (1) * Material categorization: for definitions of compliance 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 RESISTANCE VALUE RANGE GLOBAL MODEL SIZE POWER RATING P70 C W Tol. 0.5 % Tol. 1.0 % WEIGHT (typical) 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 WSR3 L = m* R = decimal 5L000 = 0.005 R0100 = 0.01 * Use "L" for resistance values < 0.01 D = 0.5 % F = 1.0 % J = 5.0 % 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) 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-standard 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 Document Number: 30101 1 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 TCR measured from -55 C to 150 C 300 for 0.004 to 0.0049 ppm/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 VAC > 500 Insulation resistance > 109 Operating temperature range C -65 to +275 Maximum working voltage V (P x R)1/2 Dielectric withstanding voltage DIMENSIONS in inches (millimeters) H W I W1 T b 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 WSR2, WSR3 L H T W W1 a b l 0.455 0.032 (11.56 0.813) 0.095 0.005 (2.41 0.127) 0.100 0.010 (2.54 0.254) 0.275 0.005 (6.98 0.127) 0.215 0.005 (5.46 0.127) 0.155 (3.94) 0.230 (5.84) 0.205 (5.21) Note * Sensing locations are based on the construction of the part; terminals are wrapped from the outside to underneath. These options place the sensing location nearest the temperature stable resistance element, which minimizes contact resistance and optimizes TCR TYPICAL SENSING LAYOUT a a c b l c a b c l 0.155 (3.94) 0.230 (5.84) 0.020 (0.51) 0.205 (5.21) Revision: 09-Jan-2019 Document Number: 30101 2 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 Rated Power in % DERATING PULSE CAPABILITY 120 100 click to get started 80 60 40 US ILL 20 0 - 65 - 25 25 75 70 125 175 225 E IV AT R T ES OS P R PU LY ON 275 Ambient Temperature C 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 Short time overload WSR2: 5x rated power for 5 s WSR3: 4x rated power for 5 s 0.5 % + 0.0005 2.0 % + 0.0005 Low temperature storage -65 C for 24 h 0.5 % + 0.0005 0.5 % + 0.0005 High temperature exposure 1000 h at +275 C 1.0 % + 0.0005 1.0 % + 0.0005 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 Moisture resistance MIL-STD-202, method 106, 0 % power, 7a and 7b not required 0.5 % + 0.0005 0.5 % + 0.0005 PACKAGING (1) REEL MODEL WSR2 and WSR3 TAPE WIDTH DIAMETER PIECES/REEL CODE 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 Document Number: 30101 3 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 Legal Disclaimer Notice www.vishay.com 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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