WRF Series
Conformal Coated Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Features:
• Conformal coating
• Flameproof construction
• Cut and formed product is available on select sizes
Contact factory for details
• RoHS compliant / lead-free
Type / Code
WRF1
WRF2
WRF3
Power Rating
(Watts) @ 25ºC
1W
2W
3W
Electrical Specifications
Maximum
Working
Voltage
Dielectric
Withstanding
Voltage (RMS)
Resistance Temperature
Coefficient
√PR
700V
-80ppm/ºC ~ +900ppm/ºC
√PR
700V
-80ppm/ºC ~ +900ppm/ºC
√PR
700V
-80ppm/ºC ~ +900ppm/ºC
Ohmic Range (Ω )
and Tolerance
5%
0.1 - 33
0.1 - 220
0.1 - 220
Mechanical Specifications
Type / Code
A
Body Length
B
Body Width
C
Lead Length (Bulk)(1)
D
Lead Diameter
WRF1
0.433 max
11.00 max
0.197 max
5.00 max
1.102 ± 0.118
28.00 ± 3.00
0.031 ± 0.002
0.78 ± 0.05
WRF2
0.630 max
16.00 max
0.197 max
5.00 max
1.102 ± 0.118
28.00 ± 3.00
0.031 ± 0.002
0.78 ± 0.05
WRF3
0.630 max
16.00 max
0.197 max
5.00 max
1.102 ± 0.118
28.00 ± 3.00
0.031 ± 0.002
0.78 ± 0.05
(1) See "Resistor Packaging Specification Document" for lead length dimension for tape and reel packaged product.
Performance Characteristics
Test Test Results
Rated Ambient Temperature
Overload 15 Times the Rated Wattage
Short Time Overload
Effective Soldering
Insulation Resistance
Dielectric Withstanding Volt
Load Life @ 70ºC - 1,000 hrs.
Moisture Resistance
Shock and Vibration
Solderability
Temperature Coefficient
Operating Temperature Range: -55ºC to +200ºC (WRF 1, 2)
85ºC
Open circuit within 2 minutes
± 3% + 0.05Ω
± 2% + 0.05Ω
>104 MΩ
± 2% + 0.05Ω
± 5% + 0.05Ω
± 5% + 0.05Ω
± 1% + 0.05Ω
90% tin covered min.
-80ppm/ºC ~ +900ppm/ºC
-55ºC to +225ºC (WRF 3)
Unit
inches
mm
inches
mm
inches
mm
Rev Date: 07/27/2012
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
1
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