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 resistors are ideal for all types of current Strip sensing, voltage division and pulse Available applications Proprietary processing technique produces extremely low resistance values (down to 0.001 ) Solid metal nickel-chrome or manganese- copper alloy resistive element with low TCR (< 20 ppm/C) Available Very low inductance 0.5 nH to 5 nH Excellent frequency response to 50 MHz Available DESIGN TOOLS (click logo to get started) Low thermal EMF (< 3 V/C) (1) AEC-Q200 qualified Models Material categorization: for definitions of compliance Available 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 POWER RATING WEIGHT GLOBAL SIZE P (typical) 70 C MODEL 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 (1) WSR3 4527 3.0 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. 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 ppm/C 300 for 0.004 to 0.0049 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 9 Insulation resistance > 10 Operating temperature range C - 65 to + 275 1/2 Maximum working voltage V (P x R) GLOBAL PART NUMBER INFORMATION Global Part Numbering example: WSR25L000FEA (visit www.vishay.net Vishay Dale parts numbering manual for all options) WS R2 5 L 0 0 0 F E A (1) GLOBAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING CODE SPECIAL WSR2 L = m * D = 0.5 % EA = lead (Pb)-free, tape/reel (dash number) WSR3 R = decimal F = 1.0 % (up to 2 digits) EK = lead (Pb)-free, bulk 5L000 = 0.005 J = 5.0 % from 1 to 99 as TA = tin/lead, tape/reel (R86) R0100 = 0.01 applicable * Use L for resistance BA = tin/lead, bulk (B43) values < 0.01 Note (1) 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. Revision: 22-Aug-16 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 91000WSR www.vishay.com Vishay Dale DIMENSIONS in inches (millimeters) H W I b W 1 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 LH T W W ab 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 the sensing location nearest the temperature stable resistance element, which minimizes contact resistance and optimizes TCR. TYPICAL SENSING LAYOUT DERATING a 120 a 100 80 c b l 60 40 c 20 ab c l 0.155 0.230 0.020 0.205 0 (3.94) (5.84) (0.51) (5.21) - 65 - 25 25 75 125 175 225 275 Ambient Temperature C 70 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 gs 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 (1) PACKAGING 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: 22-Aug-16 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 Rated Power in %