WSM1 查看數據表（PDF） - Unspecified
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WSM1 Datasheet PDF : 4 Pages
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Wirewound Resistors
WSM Series
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Ideal for automatic pick and place
Lead free, RoHS compliant construction only
Contact factory for ohmic values above published ranges
Make Possible
Welwyn Components
All parts are Pb-free and comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
Power rating at 70°C
Resistance range
Limiting element voltage
TCR
Resistance tolerance
Standard values
Ambient temperature range
*Note 5% or 10% preferred below 0.1 ohms
Physical Data
watts
ohms
volts
ppm/°C
%
°C
WSM1
1
0R01 to 1K
< 1 Ω : 100
≥ 1 Ω : 20
WSM2
2
0R01 to 2K
100
< 1 Ω : 100
≥ 1 Ω : 20
*1, 2, 5, 10
E24 preferred
-55 to 275°C
WSM3
3
0R01 to 3K
≤.03 Ω 700 ≤0.1 Ω : 200
≤10R 100 >10R 20
Dimensions Inches (mm)
Type
WSM1
WSM2
WSM3
L max
0.310 max
(7.9 max)
0.462 max
(11.7 max)
0.677 max
(17.2 max)
I Nom
0.115 max
(2.9 max)
0.137 max
(3.5 max)
0.137 max
(3.5 max)
A Max
0.275 max
(7.0 max)
0.425 max
(10.8 max)
0.64 max
(16.3 max)
W Max
0.165 max
(4.2 max)
0.260 max
(6.6 max)
0.29 max
(7.4 max)
H Max
0.155 max
(3.94 max)
0.195 max
(5.0 max)
0.265 inch
(6.7 max)
L
A
I
W
H
Recommended Pad Sizes
Type
WSM1
WSM2
WSM3
A
0.13 inch
(3.3 mm)
0.157 inch
(4.0 mm)
0.157 inch
(4.0 mm)
B
0.138 inch
(3.5 mm)
0.181 inch
(4.6 mm)
0.236 inch
(6.2 mm)
C
0.074 inch
(1.9 mm)
0.221 inch
(5.6 mm)
0.378 inch
(9.6 mm)
D
0.35 inches
(8.9 mm)
0.583 inch
(14.8 mm)
0.85 inch
(21.6 mm)
B
C
A
D
Construction
A high purity ceramic substrate is assembled with interference
fit end caps to which are welded the terminations. The
resistive element is wound on the substrate and welded to
the caps. The unit is then moulded.
Flammability
The resistor coating is a flame retardant epoxy to UL 94.
Marking
WSM resistors are legend marked with type value and
tolerance.
WSM1 Resistors are marked with value and tolerance.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
General Note
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make changes in product specification without notice or liability.
data and is considered accurate at time of going to print.
TT Electronics reserves the right to make changes in product specification without notice or liability.
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Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
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A subsidiary of
TT electronics plc
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