WSR
Power Metal Strip® Resistors, Low Value, Surface Mount
Vishay Dale
DIMENS IONS
MODEL
DIMENSIONS in inches [millimeters]
L
H
T
W
W1
W
H
WSR2
WSR3
0.455 ± 0.032 0.095 ± 0.005 0.100 ± 0.010 0.275 ± 0.005 0.215 ± 0.005
[11.56 ± 0.813] [2.41 ± 0.127] [2.54 ± 0.254] [6.98 ± 0.127] [5.46 ± 0.127]
W1
T
L
MODEL
SOLDER PAD DIMENSIONS in inches [millimeters]
b
l
a
b
l
WSR2
WSR3
0.155
[3.94]
0.230
[5.84]
0.205
[5.21]
a
120
100
80
60
40
20
0
-65
-25
25
75
125
175
225
275
Ambient Temperature °C
Derating
70
P ERFORMANCE
TEST LIMITS
TEST
CONDITIONS OF TEST
WSR2
WSR3
Thermal Shock
- 55°C to + 150°C, 1000 cycles, 15 minutes at each extreme
WSR2: 5 x rated power for 5 sec. WSR3: 4 x rated power for 5 sec
- 65°C for 24 hours
± (0.5% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
± (1.0% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
± (1.0% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
± (2.0% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
± (1.0% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
± (2.0% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
± (0.5% + 0.0005Ω) ∆R
Short Time Overload
Low Temperature Storage
High Temperature Exposure
Bias Humidity
.
1000 hours @ + 275°C
+ 85°C, 85% RH, 10% Bias, 1000 hours
100g’s for 6 milliseconds, 5 pulses
Mechanical Shock
Vibration
Frequency varied 10 to 2000Hz in one minute, 3 directions, 12 hours
1000 hours @ rated power, + 70°C, 1.5 hours “ON”, 0.5 hours “OFF”
+ 260°C Solder, 10 -12 second dwell, 25mm/second emergence
MIL-STD-202 Method 106, 0% power, 7a and 7b not required
Load Life
Resistance to Solder Heat
Moisture Resistance
PACKAGING
MODEL
REEL
TAPE WIDTH
DIAMETER
PIECES/REEL
CODE
WSR2 & WSR3
24mm/Embossed Plastic
330mm/13"
1500
R86
Embossed Carrier Tape per EIA-481-2.
www.vishay.com
93
Document Number 30101
Revision 04-Sep-01
For technical questions, contact ww2bresistors@vishay.com
