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, e2 instruments, power amplifiers • Proprietary processing technique produces extremely low resistance values (down to RoHS* COMPLIANT 0.001 Ω) • All welded construction • Solid metal Nickel-Chrome or Manganese-Copper alloy resistive 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
GLOBAL MODEL SIZE POWER RATING P70 °C W 2.0 3.0 (1) RESISTANCE RANGE Ω ± 0.5 % ± 1.0 % 0.01 - 1.0 0.001 - 1.0 0.01 - 0.2 0.001 - 0.2
WSR2 4527 WSR3 4527 Note (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 Coefficient Dielectric Withstanding Voltage Insulation Resistance Operating Temperature Range Maximum Working Voltage Weight/1000 pieces (typical) UNIT ppm/°C VAC Ω °C V g WSR2 & WSR3 0.005 Ω - 0.0099 Ω = ± 110 0.010 Ω - 1.0 Ω = ± 75 > 500 > 109 - 65 to + 275 (P x R)1/2 440
GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBERING: WSR25L000FTA (PREFERRED PART NUMBERING FORMAT)
W
GLOBAL MODEL WSR2 WSR3
S
R
2
5
L
0
0
0
F
T
A
SPECIAL (Dash Number) (up to 2 digits) From 1 - 99 as applicable
VALUE L = mΩ* R = Decimal 5L000 = 0.005 Ω R0100 = 0.01 Ω * use “L” for resistance values < 0.01 Ω
TOLERANCE D = ± 0.5 % F = ± 1.0 % J = ± 5.0 %
PACKAGING EA = Lead (Pb)-free, tape/reel EK = Lead (Pb)-free, bulk TA = 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)
WSR2
HISTORICAL MODEL
0.005 Ω
RESISTANCE VALUE
1%
TOLERANCE CODE
R86
PACKAGING
* Pb containing terminations are not RoHS compliant, exemptions may apply www.vishay.com 30 For technical questions, contact: ww2bresistors@vishay.com Document Number: 30101 Revision: 26-Mar-07
WSR
Power Metal Strip® Resistors, Low Value (down to 0.001 Ω), Surface Mount
DIMENSIONS
MODEL
W H W1 T L I a b
Vishay Dale
DIMENSIONS in inches [millimeters] L H T 0.100 ± 0.010 [2.54 ± 0.254] W 0.275 ± 0.005 [6.98 ± 0.127] W1 0.215 ± 0.005 [5.46 ± 0.127] 0.455 ± 0.032 0.095 ± 0.005 [11.56 ± 0.813] [2.41 ± 0.127]
WSR2 WSR3
MODEL WSR2 WSR3
SOLDER PAD DIMENSIONS in inches [millimeters] a 0.155 [3.94] b 0.230 [5.84] l 0.205 [5.21]
Rated Power in %
120 100 80 60 40 20 0
- 65
- 25
25
75 70
125
175
225
275
Derating
Ambient Temperature °C
PERFORMANCE
TEST Thermal Shock Short Time Overload Low Temperature Storage High Temperature Exposure Bias Humidity Mechanical Shock Vibration Load Life Resistance to Solder Heat Moisture Resistance CONDITIONS OF TEST - 55 °C to + 150 °C, 1000 cycles, 15 min at each extreme WSR2: 5 x rated power for 5 s WSR3: 4 x rated power for 5 s - 65 °C for 24 h 1000 h at + 275 °C + 85 °C, 85 % RH, 10 % Bias, 1000 h 100 g’s for 6 ms, 5 pulses Frequency varied 10 to 2000 Hz in 1 min, 3 directions, 12 h 1000 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 LIMITS WSR2 WSR3 ± (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) ΔR
MIL-STD-202 Method 106, 0 % power, 7a and 7b not required ± (0.5 % + 0.0005 Ω) ΔR ± (0.5 % + 0.0005 Ω) ΔR
PACKAGING
MODEL WSR2 and WSR3 Note • Embossed Carrier Tape per EIA-481-2 Document Number: 30101 Revision: 26-Mar-07 For technical questions, contact: ww2bresistors@vishay.com www.vishay.com 31 REEL TAPE WIDTH 24 mm/Embossed Plastic DIAMETER 330 mm/13" PIECES/REEL 1500 CODE EA
Legal Disclaimer Notice
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 herein or 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 any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000 Revision: 18-Jul-08
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