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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,
e2instruments, power amplifiers
•Proprietary processing technique produces
extremely low resistance values (down toRoHS* COMPLIANT 0.001 Ω)
•All welded construction
•Solid metal Nickel-Chrome or Manganese-Copper alloyresistive 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
GLOBALMODEL
SIZE
POWER RATING
P70 °CW2.03.0 (1)RESISTANCE RANGE
Ω
± 0.5 %± 1.0 %0.01 - 1.00.001 - 1.00.01 - 0.20.001 - 0.2
WSR24527
WSR34527Note
(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
Temperature CoefficientDielectric Withstanding VoltageInsulation Resistance
Operating Temperature RangeMaximum Working VoltageWeight/1000 pieces (typical)
UNITppm/°CVACΩ°CVg
WSR2 & WSR3
0.005 Ω - 0.0099 Ω = ± 1100.010 Ω - 1.0 Ω = ± 75
> 500> 109- 65 to + 275(P x R)1/2440
GLOBAL PART NUMBER INFORMATIONNEW GLOBAL PART NUMBERING: WSR25L000FTA (PREFERRED PART NUMBERING FORMAT)WGLOBAL MODELWSR2WSR3SR25L000FTASPECIAL(Dash Number)(up to 2 digits)From 1 - 99 asapplicableVALUEL = mΩ*R = Decimal5L000 = 0.005 ΩR0100 = 0.01 Ω * use “L” for resistancevalues < 0.01 ΩTOLERANCED = ± 0.5 %F = ± 1.0 %J = ± 5.0 %PACKAGINGEA = Lead (Pb)-free, tape/reelEK = Lead (Pb)-free, bulkTA = Tin/lead, tape/reel (R86)BA = Tin/Lead, bulk (B43) HISTORICAL PART NUMBER EXAMPLE: WSR2 0.005 Ω 1 % R86 (WILL CONTINUE TO BE ACCEPTED)WSR2HISTORICAL MODEL0.005 ΩRESISTANCE VALUE1 %TOLERANCE CODE
R86PACKAGING* Pb containing terminations are not RoHS compliant, exemptions may applywww.vishay.com30
For technical questions, contact: ww2bresistors@vishay.comDocument Number: 30101
Revision: 26-Mar-07
元器件交易网www.cecb2b.com
WSR
Power Metal Strip® Resistors,
Low Value (down to 0.001 Ω), Surface Mount
DIMENSIONS
MODEL
WHW1TLIabVishay Dale
DIMENSIONS in inches [millimeters]
L
H
T0.100 ± 0.010[2.54 ± 0.254]W0.275 ± 0.005[6.98 ± 0.127]W10.215 ± 0.005[5.46 ± 0.127]0.455 ± 0.0320.095 ± 0.005[11.56 ± 0.813][2.41 ± 0.127]WSR2WSR3MODEL WSR2WSR3 SOLDER PAD DIMENSIONS in inches [millimeters]a0.155[3.94]
b0.230[5.84]
l0.205[5.21]
Rated Power in %120100806040200- 65- 25257570125175225275DeratingAmbient Temperature °CPERFORMANCE
TESTThermal ShockShort Time OverloadLow Temperature StorageHigh Temperature ExposureBias HumidityMechanical ShockVibrationLoad Life
Resistance to Solder Heat
Moisture Resistance
CONDITIONS OF TEST- 55 °C to + 150 °C, 1000 cycles, 15 min at each extremeWSR2: 5 x rated power for 5 sWSR3: 4 x rated power for 5 s- 65 °C for 24 h1000 h at + 275 °C
+ 85 °C, 85 % RH, 10 % Bias, 1000 h100 g’s for 6 ms, 5 pulses
Frequency varied 10 to 2000 Hz in 1 min, 3 directions, 12 h1000 h at rated power, + 70 °C, 1.5 h “ON”, 0.5 h “OFF”+ 260 °C Solder, 10 - 12 s dwell, 25 mm/s emergence
TEST LIMITSWSR2WSR3± (0.5 % + 0.0005 Ω) ΔR± (0.5 % + 0.0005 Ω) ΔR± (0.5 % + 0.0005 Ω) ΔR± (2.0 % + 0.0005 Ω) ΔR± (0.5 % + 0.0005 Ω) ΔR± (0.5 % + 0.0005 Ω) ΔR± (1.0 % + 0.0005 Ω) ΔR± (1.0 % + 0.0005 Ω) ΔR± (0.5 % + 0.0005 Ω) ΔR± (0.5 % + 0.0005 Ω) ΔR± (0.5 % + 0.0005 Ω) ΔR± (0.5 % + 0.0005 Ω) ΔR± (0.5 % + 0.0005 Ω) ΔR± (0.5 % + 0.0005 Ω) ΔR± (1.0 % + 0.0005 Ω) ΔR± (2.0 % + 0.0005 Ω) ΔR± (0.5 % + 0.0005 Ω) ΔR± (0.5 % + 0.0005 Ω) ΔRMIL-STD-202 Method 106, 0 % power, 7a and 7b not required± (0.5 % + 0.0005 Ω) ΔR± (0.5 % + 0.0005 Ω) ΔRPACKAGING
MODEL
WSR2 and WSR3Note
•Embossed Carrier Tape per EIA-481-2
Document Number: 30101Revision: 26-Mar-07
For technical questions, contact: ww2bresistors@vishay.comwww.vishay.com
31
REEL
TAPE WIDTH24 mm/Embossed Plastic
DIAMETER330 mm/13\"
PIECES/REEL
1500
CODEEA
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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 hereinor 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 anyinformation provided herein to the maximum extent permitted by law. The product specifications do not expand orotherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressedtherein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by thisdocument or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unlessotherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in suchapplications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resultingfrom such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regardingproducts designed for such applications.
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Document Number: 91000Revision: 18-Jul-08
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