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WSK
Vishay Dale
Power Metal Strip(R) Resistors, Low Value (down to 0.001 ), Surface Mount, 4-Terminal
FEATURES
* 4-Terminal design allows for 1 % tolerance down to 0.001 and 0.5 % tolerance down to 0.003 Pb-free Available * Ideal for all types of precision current sensing, voltage division and pulse applications including switching and linear power supplies, e3 instruments, power amplifiers * Proprietary processing technique produces RoHS* extremely low resistance values (down to 0.001 ) COMPLIANT * 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 * Lead (Pb)-free version is RoHS compliant
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL MODEL WSK2512 POWER RATING P70 C W 1.0 RESISTANCE RANGE 0.5 % 0.003 - 0.025 1.0 % 0.001 - 0.025
Note * Part Marking: DALE, Value, Tolerance; due to resistor size limitations some resistance values will be marked with only the resistance value
TECHNICAL SPECIFICATIONS
PARAMETER Temperature Coefficient Operating Temperature Range Maximum Working Voltage Weight/1000 pieces UNIT ppm/C C V g WSK2512 0.001 - 0.0029 = 250 0.003 - 0.0049 = 75 0.005 - 0.025 = 35 - 65 to + 170 (P x R)1/2 63.6
GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBERING: WSK25125L000FTA (PREFERRED PART NUMBERING FORMAT)
W
S
K
2
5
1
2
5
L
0
0
0
F
T
A
SPECIAL (Dash Number) (up to 2 digits) From 1 - 99 as applicable
GLOBAL MODEL WSK2512
RESISTANCE VALUE L = m* R = Decimal 5L000 = 0.005 R0100 = 0.01 * use "L" for resistance values < 0.01
TOLERANCE CODE D = 0.5 % F = 1.0 %
PACKAGING CODE EA = Lead (Pb)-free, tape/reel EK = Lead (Pb)-free, bulk TA = Tin/lead, tape/reel (R86) BA = Tin/lead, bulk (B43)
HISTORICAL PART NUMBERING: WSK2512 0.005 1 % R86 (WILL CONTINUE TO BE ACCEPTED) WSK2512 0.005 1% R86
HISTORICAL MODEL
RESISTANCE VALUE
TOLERANCE CODE
PACKAGING
* Pb containing terminations are not RoHS compliant, exemptions may apply www.vishay.com 20 For technical questions, contact: ww2bresistors@vishay.com Document Number: 30108 Revision: 26-Mar-07
WSK
Power Metal Strip(R) Resistors, Low Value (down to 0.001 ), Surface Mount, 4-Terminal
DIMENSIONS
L W
Vishay Dale
H
B
A
T
b
l d c e a
DIMENSIONS in inches [millimeters] MODEL RESISTANCE RANGE 0.001 - 0.0049 WSK2512 0.005 - 0.025 L 0.250 0.010 [6.35 0.254] 0.250 0.010 [6.35 0.254] W 0.125 0.010 [3.18 0.254] 0.125 0.010 [3.18 0.254] H 0.025 0.010 [0.635 0.254] 0.025 0.010 [0.635 0.254] T 0.087 0.010 [2.21 0.254] 0.047 0.010 [1.19 0.254] A 0.030 0.010 [0.762 0.254] 0.030 0.010 [0.762 0.254] B 0.020 0.010 [0.508 0.254] 0.020 0.010 [0.508 0.254]
MODEL WSK2512
a 0.125 [3.18]
b 0.130 [3.30]
Rated Power in % 120 100 80 60 40 20
SOLDER PAD DIMENSIONS in inches [millimeters] c d e 0.030 [0.76] 0.020 [0.51] 0.055 [1.40]
I 0.065 [1.65]
0 - 65 - 55 - 25
0
25
50
Derating
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
75 100 125 150 170 70 Ambient Temperature C
CONDITIONS OF TEST - 55 C to + 150 C, 1000 cycles, 15 min at each extreme 5 x power for 5 s - 65 C for 24 h 1000 h at + 170 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 MIL-STD-202 Method 106, 0 % power, 7a and 7b not required
TEST LIMITS (0.5 % + 0.0005 ) R (0.5 % + 0.0005 ) R (0.5 % + 0.0005 ) R (1.0 % + 0.0005 ) R (0.5 % + 0.0005 ) R (0.5 % + 0.0005 ) R (0.5 % + 0.0005 ) R (1.0 % + 0.0005 ) R (0.5 % + 0.0005 ) R (0.5 % + 0.0005 ) R
PACKAGING
MODEL WSK2512 Note * Embossed carrier tape per EIA-481-1A Document Number: 30108 Revision: 26-Mar-07 For technical questions, contact: ww2bresistors@vishay.com www.vishay.com 21 REEL TAPE WIDTH 12 mm/Embossed Plastic DIAMETER 178 mm/7" RIECES/REEL 2000 CODE R86
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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