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 current sensing, voltage division and pulse Available applications Proprietary processing technique produces extremely low resistance values (down to Available 0.001 ) Sulfur resistance by construction that is Available unaffected by high sulfur environments Solid metal nickel-chrome or manganese- click logo to get started DESIGN SUPPORT TOOLS Available copper alloy resistive element with low TCR (< 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 V/C) (1) AEC-Q200 qualified 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 POWER RATING WEIGHT GLOBAL SIZE P (typical) 70 C MODEL W g/1000 pieces Tol. 0.5 % Tol. 1.0 % 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 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) (2) (3) 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 % 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-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 300 for 0.004 to 0.0049 TCR measured from -55 C to ppm/C 450 for 0.003 to 0.0039 150 C 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) DIMENSIONS in inches (millimeters) W H 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 a a c b l c abc l 0.155 0.230 0.020 0.205 (3.94) (5.84) (0.51) (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