Metal Film Resistors, Power, Surface Mount
www.vishay.com For technical questions, contact: ww2aresistors@vishay.com Document Number: 30104
296 Revision: 03-Dec-10
WSF
Vishay Dale
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)
•AEC-Q200 qualified available (1)
•Compliant to RoHS Directive 2002/95/EC
Note
(1) Flame retardance test may not be applicable to
some resistor technologies.
Notes
• Part marking: 1/2 W - DALE, value; 1 W - model, value, tolerance, date code; 2 W - DALE, model, value, tolerance, date code.
(2) E96 values only.
(3) Resistance values above 31.25 kΩ are limited to 250 V maximum working voltage.
(4) ± 50 ppm/°C and ± 25 ppm/°C available.
* Pb containing terminations are not RoHS compliant, exemptions may apply
** Please see document “Vishay Material Category Policy”: www.vishay.com/doc?99902
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 to 1.43K (2) Epoxy
WSF2515 2515 1.0 0.5, 1, 5 10 to 10K Thermoplastic
WSF4527 4527 2.0 (3) 0.5, 1, 5 10 to 100K Thermoplastic
TECHNICAL SPECIFICATIONS
PARAMETER UNIT WSF2012 WSF2515 WSF4527
Temperature coefficient ppm/°C ± 100 (4) ± 100 (4) ± 100 (4)
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 (3)
Weight/1000 pieces (typical) g 90 165 760
GLOBAL PART NUMBER INFORMATION
Global Part Numbering example: WSF25151K500JKTA (preferred numbering format)
GLOBAL MODEL VALUE TOLERANCE TCR PACKAGING SPECIAL
WSF2012
WSF2515
WSF4527
R = Decimal
K = Thousand
100R0 = 100 Ω
1K000 = 1 kΩ
D = ± 0.5 %
F = ± 1.0 %
G = ± 2.0 %
H = ± 3.0 %
J = ± 5.0 %
K = ± 10 %
E = ± 25 ppm/°C
H = ± 50 ppm/°C
K = ± 100 ppm/°C
EA = Lead (Pb)-free,
tape/reel
EK = Lead (Pb)-free, bulk
TA = Tin/lead , tape/reel
(R86)
BA = Tin/lead, tape/reel,
bulk (B43)
(Dash number)
(Up to 2 digits)
From 1 to 99 as
applicable
Historical Part Numbering example: WSF2515 1.5 kΩ 5 % 100 ppm/°C R86 (will continue to be accepted for tin/lead product only)
WSF2515 1.5 kΩ5 % 100 ppm/°C R86
HISTORICAL MODEL RESISTANCE VALUE TOLERANCE CODE TEMPERATURE
COEFFICIENT PACKAGING
SF25151K5W00JKTA
Document Number: 30104 For technical questions, contact: ww2aresistors@vishay.com www.vishay.com
Revision: 03-Dec-10 297
WSF
Metal Film Resistors, Power, Surface Mount Vishay Dale
DIMENSIONS
Note
• Embossed Carrier Tape per EIA-481.
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 min at each extreme ± (1.0 % + 0.05 Ω) ΔR
Short time overload 5 x rated power for 5 s ± (0.5 % + 0.05 Ω) ΔR
Low temperature storage - 65 °C for 24 h ± (0.5 % + 0.05 Ω) ΔR
High temperature exposure 1000 h at + 175 °C (150 °C for WSF4527) ± (1.0 % + 0.05 Ω) ΔR
Bias humidity + 85 °C, 85 % RH, 10 % Bias, 1000 h ± (0.5 % + 0.05 Ω) ΔR
Moisture resistance MIL-STD-202 method 106, 0 % power, 7a and 7b not required ± (0.5 % + 0.05 Ω) ΔR
Mechanical shock 100 g’s for 11 ms, 5 pulses ± (0.5 % + 0.05 Ω) ΔR
Vibration Frequency varied 10 Hz to 500 Hz in one min, 3 directions, 9 h ± (0.5 % + 0.05 Ω) ΔR
Load life 1000 h at rated power, + 70 °C, 1.5 h “ON”, 0.5 h “OFF” ± (1.0 % + 0.05 Ω) ΔR
Resistance to solder heat + 260 °C solder, 10 s to 12 s dwell, 25 mm/s emergence ± (0.5 % + 0.05 Ω) ΔR
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: 11-Mar-11 1
Disclaimer
Legal Disclaimer Notice
Vishay
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
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 in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular
purpose, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of typical
requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements
about the suitability of products for a particular application. It is the customer’s responsibility to validate that a particular
product with the properties described in the product specification is suitable for use in a particular application. Parameters
provided in datasheets and/or specifications may vary in different applications and performance may vary over time. All
operating parameters, including typical parameters, must be validated for each customer application by the customer’s
technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,
including but not limited to the warranty expressed therein.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk and agree
to fully indemnify and hold Vishay and its distributors harmless from and against any and all claims, liabilities, expenses and
damages arising or resulting in connection with such use or sale, including attorneys fees, even if such claim alleges that Vishay
or its distributor was negligent regarding the design or manufacture of the part. Please contact authorized Vishay personnel to
obtain written terms and conditions regarding products designed for such applications.
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. Product names and markings noted herein may be trademarks of their respective owners.
