Vitreous Enamelled Wirewound Resistors
IRC Wire and Film Technologies Division
W20 Series
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Rugged all-welded construction
High purity ceramic substrate
Impervious lead-free vitreous enamel coating
High stability and high reliability
Suitable for harsh environments
Overload charcteristics ideal for protection circuits
Lead-free, RoHS-compliant construction
Specifications
Part
Number
W21
Power rating
@25°C
(Watts)
Tolerance
(±%)
1
2
Thermal
Impedance1
(°C/watt)
1
2
1
1 - 100K
2
0.15 - 100K
100
88
Typical: <+75
Maximum: +200
160
58
Typical: <+75
Maximum: +200
200
44
Typical: <+75
Maximum: +200
500
29
Typical: <+75
Maximum: +200
750
22
5
1 - 100K
Typical: <+75
Maximum: +200
5
1 - 60K
0.15 - 60K
14.0
1
2
1 - 60K
W24
1 - 22K
0.1 - 22K
10.0
Limiting Element
Voltage
(Volts)
5
0.5 - 22K
W23
TCR
(±ppm/°C)
5
1 - 15K
0.1 - 15K
7.0
2
0.5 - 15K
W22
1
0.1 - 10K
5.0
1 - 10K
0.5 - 10K
W215
3.0
Resistance
Range
(Ohms)
5
Notes
1
See temperature rise graph
Application Notes
The terminations should not be bent closer than 1.6mm from the body of the resistor, and the recommended
bend radius is 1.2mm. Terminations are solderable to within 4mm from the resistor body.
When cold, vitreous enamel has excellent insulation resistance. In common with all insulation materials, the
specific resistance of the enamel decreases with increased temperatures. Therefore, resistors operated at
near-maximum temperature cannot be considered as insulated and should not be used in contact with any
conductive material.
Care must be taken when determining clearance distance between the resistor body and printed circuit board
or other components to ensure these are not overheated. Resistance is measured 6mm from the resistor body.
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of printing.
© IRC Wire and Film Technologies Division • 736 Greenway Road Boone, North Carolina 28607-1860
Telephone: 828 264 8861 • Facsimile: 828 264 8866 • Website: www.irctt.com
bn802 W20 Series Datasheet_2.ind1 1
A subsidiary of
TT electronics plc
W20 Series Issue November 2006
11/17/06 4:40:29 PM
