WSLS2512, Improved Stability
www.vishay.com
Vishay Dale
Power Metal Strip® Resistors, Improved Stability
(0.25 % and 0.5 %), Low Value, Surface-Mount
FEATURES
• Current sensing in high-temperature (+125 °C)
applications
• Greater stability with maximum resistance
change of 0.25 % or 0.5 % through 2000 h
workload
• All welded construction of the Power Metal
Strip® resistors are ideal for all types of current
sensing, voltage division, and pulse applications Available
• Proprietary processing technique produces
extremely low resistance values (0.01 Ω to 0.1 Ω)
• Solid metal nickel-chrome resistive element with
Available
low TCR (< 20 ppm/°C)
• Sulfur resistance by construction that is unaffected by
high sulfur environments
• Very low inductance 0.5 nH to 2 nH
• Low thermal EMF (< 3 μV/°C)
• AEC-Q200 qualified (1)
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
LINKS TO ADDITIONAL RESOURCES
3D 3D
3D Models
Design Tools
Videos
Notes
• This datasheet provides information about parts that are RoHS-compliant and / or parts that are non-RoHS-compliant. For example, parts
with lead (Pb) terminations are not RoHS-compliant. Please see the information / tables in this datasheet for details
• Follow link to Overview of Automotive Grade Products for more details: www.vishay.com/doc?49924
• “SMD Current Sense: AEC-Q200 vs. Vishay Qualification” technical note: www.vishay.com/doc?30416
(1) Flame retardance test may not be applicable to some resistor technologies
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL MODEL
SIZE
POWER RATING
P70 °C
W
TOLERANCE
±%
RESISTANCE
VALUE RANGE
Ω
WEIGHT
(typical)
g/1000 pieces
WSLS2512
2512
1.0
0.5, 1.0, 5.0
0.01 to 0.1
63.6
Notes
• Part marking: value, RTC / stability code
• “Thermal Management for Surface-Mount Devices” white paper: www.vishay.com/doc?30380
GLOBAL PART NUMBER INFORMATION
Global Part Numbering example: WSLS2512R0100FHEA (visit www.vishay.net Vishay Dale parts numbering manual for all options)
W
S
L
S
2
5
1
2
R
0
1
0
0
F
H
E
A
GLOBAL MODEL
RESISTANCE VALUE (1)
TOLERANCE CODE
RTC / STABILITY
PACKAGING CODE (2)
SPECIAL
WSLS2512
R = decimal
R0100 = 0.01 Ω
D = ± 0.5 %
F = ± 1.0 %
J = ± 5.0 %
G = 75 ppm,
0.25 % stability
H = 75 ppm,
0.5 % stability
EA = lead (Pb)-free,
tape / reel
EK = lead (Pb)-free,
bulk
(dash number)
(single digit)
from 1 to 9
Notes
• Per PCN-DR-00009-2022-REV-0, WSL marking will be removed effective March 1st, 2023
(1) WSL marking (www.vishay.com/doc?30327); WSL Decade Values (www.vishay.com/doc?30117)
(2) Packaging code: EB (lead (Pb)-free) and TB (tin / lead) are non-standard packaging codes designating 1000 piece reels. These non-standard
packaging codes are identical to our standard EA (lead (Pb)-free) and TA (tin / lead), except that they have a package quantity of 1000 pieces
Revision: 04-Apr-2022
Document Number: 30123
1
For technical questions, contact: ww2bresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
WSLS2512, Improved Stability
www.vishay.com
Vishay Dale
TECHNICAL SPECIFICATIONS
PARAMETER
Component temperature coefficient (including terminal) (1)
Element TCR (2)
Operating temperature range
Maximum working voltage (3)
UNIT
ppm/°C
ppm/°C
°C
V
RESISTOR CHARACTERISTICS
± 75
< 20
-65 to +170
(P x R)1/2
Notes
• “Temperature Coefficient of Resistance for Current Sensing” white paper: www.vishay.com/doc?30405
(1) Component TCR - total TCR that includes the TCR effects of the resistor element and the copper terminal
(2) Element TCR - only applies to the alloy used for the resistor element; refer to item 1 in the construction illustration on the following page
(3) Maximum working voltage - the WSL is not voltage sensitive, but is limited by power / energy dissipation and is also not ESD sensitive
DIMENSIONS in inches (millimeters)
H
l
b
W
a
T
L
Typical sensing traces
Notes
• 3D models available: www.vishay.com/doc?30306
• Surface-mount solder profile recommendations: www.vishay.com/doc?31052
DIMENSIONS
MODEL
W
H
T
a
b
l
0.250 ± 0.010
(6.35 ± 0.254)
0.125 ± 0.010
(3.18 ± 0.254)
0.025 ± 0.010
(0.635 ± 0.254)
0.030 ± 0.010
(0.762 ± 0.254)
0.065
(1.65)
0.145
(3.68)
0.160
(4.06)
WELDED CONSTRUCTION 2512
4
1
2
DERATING
1) Resistive element:
solid metal nickel-chrome
or manganese-copper
alloy resistive element with
low TCR (< 20 ppm/°C)
2) Plated terminal
3) Terminal / element weld
4) Silicone coating with ink print
Rated Power in %
WSLS2512
SOLDER PAD DIMENSIONS
L
3
120
100
80
60
40
20
0
-65 -50
-25
0
25
50
75
70
100 125 150 170
Ambient Temperature in °C
PERFORMANCE
TEST
CONDITIONS OF TEST
TEST LIMITS
0.25 %
0.5 %
Thermal shock
-55 °C to +150 °C, 1000 cycles, 15 min at each extreme
± 0.5 % + 0.005 Ω
Short time overload
5 x rated power for 5 s for WSL2512 size or smaller
± 0.5 % + 0.005 Ω
Low temperature operation
-65 °C for 24h
± 0.5 % + 0.005 Ω
High temperature exposure
1000 h at +170 °C
± 1.0 % + 0.005 Ω
Bias humidity
+85 °C, 85 % RH, 10 % bias, 1000 h
± 0.5 % + 0.005 Ω
Mechanical shock
100 g’s for 6 ms, 5 pulses
± 0.5 % + 0.005 Ω
Vibration
Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h
Load life
2000 h at 70 °C, 1.5 h “ON”, 0.5 h “OFF”
Resistance to solder heat
+260 °C solder, 10 s to 12 s dwell, 25 mm/s emergence
± 0.5 % + 0.005 Ω
Moisture resistance
MIL-STD-202, method 106, 0 % power, 7b not required
± 0.5 % + 0.005 Ω
Revision: 04-Apr-2022
± 0.5 % + 0.005 Ω
± 0.25 %
± 0.5 %
Document Number: 30123
2
For technical questions, contact: ww2bresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
WSLS2512, Improved Stability
www.vishay.com
PACKAGING
Vishay Dale
(1)
MODEL
WSLS2512
REEL
TAPE WIDTH
DIAMETER
PIECES/REEL
CODE
12 mm / embossed plastic
178 mm / 7"
2000
EA
Notes
• Embossed carrier tape per EIA-481
(1) Additional packaging details at www.vishay.com/doc?20051
Revision: 04-Apr-2022
Document Number: 30123
3
For technical questions, contact: ww2bresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
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“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
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Revision: 01-Jan-2022
1
Document Number: 91000
