WSLT3921, WSLT5931
Vishay Dale
Power Metal Strip Resistors, High Temperature (275 C),
Low Value (Down to 0.0003 ), Surface Mount
FEATURES
Ideal for all types of current sensing, voltage
division and pulse applications including
switching and linear power supplies,
instruments, power amplifiers
Proprietary processing technique produces
extremely low resistance values, down to
0.0003
Specially selected and stabilized materials
allow for high temperature derating
(to + 275 C)
All welded construction
Solid metal iron-chrome or manganese-copper alloy
resistive element with low TCR (< 20 ppm/C)
Very low inductance (< 5 H)
Low thermal EMF (< 3 V/C)
(1)
AEC-Q200 qualified available
Compliant to RoHS Directive 2002/95/EC
Note
(1)
Flame retardance test may not be applicable to some resistor
technologies.
STANDARD ELECTRICAL SPECIFICATIONS
POWER RATING RESISTANCE VALUE RESISTANCE VALUES WEIGHT
GLOBAL TOLERANCE
(2)
SIZE P RANGE CURRENTLY AVAILABLE (typical)
70 C
MODEL %
W g/1000 pieces
WSLT3921 3921 3.0 1.0, 5.0 0.5 m to 4 m 0.5 m, 1 m, 2 m, 3 m, 4 m 281
WSLT5931 5931 5.0 1.0, 5.0 0.3 m to 3 m 0.3 m, 0.5 m, 1 m, 2 m, 3 m 398
Notes
Part marking: No part marking on these parts.
(2)
Other values may be available, contact factory.
TECHNICAL SPECIFICATIONS
PARAMETER UNIT RESISTOR CHARACTERISTICS
Temperature coefficient ppm/C 175 for 0.3 m and 0.5 m, 75 for 1 m to 4 m
Operating temperature range C - 65 to + 275
1/2
Maximum working voltage V (P x R)
GLOBAL PART NUMBER INFORMATION
Global Part Numbering: WSLT39212L000FEA (WSLT3921, 0.002 , 1 %)
W S L T 3 9 2 1 2 L 0 0 0 F E A
GLOBAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING CODE SPECIAL
WSLT3921 L = m F = 1.0 % EA = Lead (Pb)-free, tape/reel Reserved for
WSLT5931 2L000 = 0.002 J = 5.0 % EK = Lead (Pb)-free, bulk future specials
** Please see document Vishay Material Category Policy: www.vishay.com/doc?99902
www.vishay.com For technical questions, contact: ww2bresistors@vishay.com Document Number: 30136
388 Revision: 18-Nov-10
WSLT3921, WSLT5931
Power Metal Strip Resistors, High Temperature (275 C), Vishay Dale
Low Value (Down to 0.0003 ), Surface Mount
DIMENSIONS
DIMENSIONS in inches (millimeters)
MODEL
LW H T
0.394 0.010 0.205 0.010 0.020 0.080 0.010
H
WSLT3921
D
(10.0 0.254) (5.20 0.254) (0.5) (2.00 0.254)
0.591 0.010 0.305 0.010 0.020 0.157 0.010
L
W
WSLT5931
(15.0 0.254) (7.75 0.254) (0.5) (4.00 0.254)
T
SOLDER PAD DIMENSIONS in inches (millimeters)
MODEL
db l
0.106 0.010 0.244 0.010 0.220 0.005
WSLT3921
(2.70 0.254) (6.20 0.254) (5.60 0.13)
I
0.205 0.010 0.344 0.010 0.220 0.005
b
WSLT5931
(5.20 0.254) (8.75 0.254) (5.60 0.13)
d
GLOBAL RESISTANCE D THICKNESS ELEMENT
MODEL VALUE (m) (inches) MATERIAL
DERATING
WSLT3921 0.5 0.0300 Mn-Cu
120
WSLT3921 1.0 0.0150 Mn-Cu
100
WSLT3921 2.0 0.0270 Fe-Cr
80
WSLT3921 3.0 0.0170 Fe-Cr
60
WSLT3921 4.0 0.0130 Fe-Cr
WSLT5931 0.3 0.0300 Mn-Cu
40
WSLT5931 0.5 0.0180 Mn-Cu
20
WSLT5931 1.0 0.0330 Fe-Cr
0
WSLT5931 2.0 0.0155 Fe-Cr
- 65 - 25 25 75 125 175 225 275
Ambient Temperature in C
WSLT5931 3.0 0.0105 Fe-Cr
70
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
Thermal shock - 55 C to + 150 C, 1000 cycles, 15 min at each extreme (1.0 % + 0.0005 ) R
Short time overload 5 x rated power for 5 s (0.5 % + 0.0005 ) R
Low temperature storage - 65 C for 45 min (0.5 % + 0.0005 ) R
High temperature exposure 1000 h at + 275 C (1.0 % + 0.0005 ) R
Bias humidity + 85 C, 85 % RH, 10 % bias, 1000 h (0.5 % + 0.0005 ) R
Mechanical shock 100 gs for 6 ms, 5 pulses (0.5 % + 0.0005 ) R
Vibration Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h (0.5 % + 0.0005 ) R
Load life 1000 h at + 70 C, 1.5 h ON, 0.5 h OFF (1.0 % + 0.0005 ) R
Resistance to solder heat + 260 C solder, 10 s to 12 s dwell, 25 mm/s emergence (0.5 % + 0.0005 ) R
Moisture resistance MIL-STD-202, method 106, 0 % power, 7a and 7b not required (0.5 % + 0.0005 ) R
PACKAGING
REEL
MODEL
TAPE WIDTH DIAMETER PIECES/REEL CODE
WSLT3921 16 mm/embossed plastic 330 mm/13" 3000 EA
WSLT5931 24 mm/embossed plastic 330 mm/13" 1500 EA
Note
Embossed carrier tape per EIA-481.
Document Number: 30136 For technical questions, contact: ww2bresistors@vishay.com www.vishay.com
Revision: 18-Nov-10 389
Rated Power in %