WSF
Vishay Dale
Document Number: 30104 For technical questions, contact: ww2aresistors@vishay.com www.vishay.com
Revision: 02-Aug-07 233
Metal Film Resistors, Power, Surface Mount
FEATURES
•Molded encapsulation
•Wraparound Compliant Terminations eliminate
risk of solder fillet cracking
•Solderable terminations
•Excellent stability at different environmental
conditions
•High power ratings (up to 2 W)
Notes
1) E96 values only
2) Resistance values above 31 250 Ω are limited to 250 maximum working voltage
• Part Marking: 1/2 W - DALE, Value; 1 W - Model, Value, Tolerance, Date Code; 2 W - DALE, Model, Value, Tolerance, Date Code.
Notes
3) ± 50 ppm/°C and ± 25 ppm/°C available
4) Resistance values above 31 250 Ω are limited to 250 V maximum working voltage
* Pb containing terminations are not RoHS compliant, exemptions may apply
Available
Pb-free
RoHS*
COMPLIANT
e3
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
SIZE
INCH
POWER RATING
P70 °C
W
TOLERANCE
± %
RESISTANCE
RANGE
Ω
ENCAPSULATION
WSF2012 2012 0.5 0.5, 1, 5 5.0 - 1.43K 1) Epoxy
WSF2515 2515 1.0 0.5, 1, 5 10 - 10K Thermoplastic
WSF4527 4527 2.02) 0.5, 1, 5 10 - 100K Thermoplastic
TECHNICAL SPECIFICATIONS
PARAMETER UNIT WSF2012 WSF2515 WSF4527
Temperature Coefficient ppm/°C ± 100 3) ± 100 3) ± 100 3)
Dielectric Withstanding Voltage VAC > 500 > 500 > 500
Insulation Resistance Ω> 109
Operating Temperature Range °C - 65/+ 175 - 65/+ 175 - 65/+ 150
Maximum Working Voltage V (P x R)1/2 (P x R)1/2 (P x R)1/2 4)
Weight/1000 pieces (typical) g 90 165 760
GLOBAL PA RT NUMBER INFORMA TION
New Global Part Numbering: WSF25151K500JKTA (preferred part numbering format)
WSF25 1 51K5 0 0JK TA
Historical Part Number example: WSF2515 1.5 kΩ 5 % 100 ppm/°C R86 (will continue to be accepted)
WSF2515
HISTORICAL MODEL
1.5 kΩ
RESISTANCE VALUE
5 %
TOLERANCE
CODE
R86
PACKAGING
GLOBAL MODEL
WSF2012
WSF2515
WSF4527
SPECIAL
(Dash Number)
(up to 2 digits)
From 1 - 99 as
applicable
100 ppm/°C
TEMPERATURE
COEFFICIENT
VALUE
R = decimal
K = thousand
54R15 = 54.15 Ω
1K325 = 1.325 kΩ
G = ± 2.0 %
TOLERANCE
D = ± 0.5 %
F = ± 1.0 %
H = ± 3.0 %
J = ± 5.0 %
K = ± 10 %
PACKAGING
EA = Lead (Pb)-free, tape/reel
EK = Lead (Pb)-free, bulk
TA = Tin/Lead, tape/reel (R86)
BA = Tin/Lead, bulk (B43)
TCR
E = 25 ppm/°C
H = 50 ppm/°C
K = 100 ppm/°C
www.vishay.com For technical questions, contact: ww2aresistors@vishay.com Document Number: 30104
234 Revision: 02-Aug-07
WSF
Vishay Dale Metal Film Resistors, Power, Surface Mount
DIMENSIONS
Embossed Carrier Tape per EIA 481-1, 2.
W
L
T
H
W
1
l
a
b
MODEL DIMENSIONS in inches [millimeters]
LHTW
W1
WSF2012
0.200 ± 0.020
[5.08 ± 0.508]
0.096 ± 0.015
[2.44 ± 0.381]
0.040 ± 0.010
[1.02 ± 0.254]
0.125 ± 0.005
[3.18 ± 0.127]
0.050 ± 0.005
[1.27 ± 0.127]
WSF2515
0.250 ± 0.020
[6.35 ± 0.508]
0.110 ± 0.015
[2.79 ± 0.381]
0.045 ± 0.010
[1.14 ± 0.254]
0.150 ± 0.005
[3.81 ± 0.127]
0.098 ± 0.005
[2.49 ± 0.127]
WSF4527
0.455 ± 0.020
[11.56 ± 0.508]
0.167 ± 0.010
[4.24 ± 0.254]
0.100 ± 0.010
[2.54 ± 0.254]
0.275 ± 0.005
[6.98 ± 0.127]
0.215 ± 0.005
[5.46 ± 0.127]
MODEL SOLDER PAD DIMENSIONS in inches [millimeters]
ab l
WSF2012 0.085 [2.16] 0.070 [1.78]0.080 [2.03]
WSF2515 0.090 [2.29] 0.115 [2.92] 0.120 [3.05]
WSF4527 0.155 [3.94] 0.230 [5.94] 0.205 [5.21]
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
Thermal Shock - 55 °C to + 150 °C, 1000 cycles, 15 minutes at each extreme ± (1.0 % + 0.05 Ω)
Δ
R
Short Time Overload 5 x rated power for 5 seconds ± (0.5 % + 0.05 Ω)
Δ
R
Low Temperature Storage - 65 °C for 24 hours ± (0.5 % + 0.05 Ω)
Δ
R
High Temperature Exposure 1000 hours at + 175 °C (150 °C for WSF4527) ± (1.0 % + 0.05 Ω)
Δ
R
Bias Humidity + 85 °C, 85 % RH, 10 % Bias, 1000 hours ± (0.5 % + 0.05 Ω)
Δ
R
Moisture Resistance MIL-STD-202 Method 106, 0 % Power, 7a and 7b not required ± (0.5 % + 0.05 Ω)
Δ
R
Mechanical Shock 100 g’s for 11 milliseconds, 5 pulses ± (0.5 % + 0.05 Ω)
Δ
R
Vibration Frequency varied 10 to 500 Hz in one minute, 3 directions, 9 hours ± (0.5 % + 0.05 Ω)
Δ
R
Load Life 1000 hours at rated power, + 70 °C, 1.5 hours “ON”, 0.5 hours “OFF” ± (1.0 % + 0.05 Ω)
Δ
R
Resistance to Solder heat + 260 °C solder, 10 - 12 second dwell, 25 mm/second emergence ± (0.5 % + 0.05 Ω)
Δ
R
PACKAGING
MODEL REEL
TAPE WIDTH DIAMETER PIECES/REEL CODE
WSF2012 12 mm/Embossed Plastic 330 mm/13" 2000 EA/TA
WSF2515 16 mm/Embossed Plastic 330 mm/13" 2000 EA/TA
WSF4527 24 mm/Embossed Plastic 330 mm/13" 1200 EA/TA
Temperature Rise
200
150
100
50
0
0 0.5 1.0 1.5 2.0
Power in W
WSF2012
WSF2515 WSF4527
Temperature Rise in °C
Derating
120
100
80
60
40
20
0
- 65 - 25 0 2 55 07 5 100 125 150 175 200
Ambient T emperature in °C
70
W SF2012
WSF2515
WSF4527
Rated Power In %
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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