Rev Date: 07/27/2012 1 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
WRF Series
Conformal Coated Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Features:
âą Conformal coating
âą Flameproof construction
âą Cut and formed product is available on select sizes
Contact factory for details
âą RoHS compliant / lead-free
Maximum Dielectric
Working Withstanding
Voltage Voltage (RMS)
WRF1 1W âPR 700V -80ppm/ÂșC ~ +900ppm/ÂșC 0.1 - 33
WRF2 2W âPR 700V -80ppm/ÂșC ~ +900ppm/ÂșC 0.1 - 220
WRF3 3W âPR 700V -80ppm/ÂșC ~ +900ppm/ÂșC 0.1 - 220
Type / Code Power Rating
(Watts) @ 25ÂșC
Resistance Temperature
Coefficient
Ohmic Range (⊠)
and Tolerance
5%
Electrical Specifications
Test Results
85ÂșC
Open circuit within 2 minutes
± 3% + 0.05âŠ
± 2% + 0.05âŠ
>10
4
MâŠ
± 2% + 0.05âŠ
± 5% + 0.05âŠ
± 5% + 0.05âŠ
± 1% + 0.05âŠ
90% tin covered min.
-80ppm/ÂșC ~ +900ppm/ÂșC
Operating Temperature Range: -55ÂșC to +200ÂșC (WRF 1, 2)
-55ÂșC to +225ÂșC (WRF 3)
Load Life @ 70ÂșC - 1,000 hrs.
Moisture Resistance
Shock and Vibration
Temperature Coefficient
Solderability
Short Time Overload
Effective Soldering
Insulation Resistance
Dielectric Withstanding Volt
Test
Rated Ambient Temperature
Overload 15 Times the Rated Wattage
0.433 max 0.197 max 1.102 ± 0.118 0.031 ± 0.002 inches
11.00 max 5.00 max 28.00 ± 3.00 0.78 ± 0.05 mm
0.630 max 0.197 max 1.102 ± 0.118 0.031 ± 0.002 inches
16.00 max 5.00 max 28.00 ± 3.00 0.78 ± 0.05 mm
0.630 max 0.197 max 1.102 ± 0.118 0.031 ± 0.002 inches
16.00 max 5.00 max 28.00 ± 3.00 0.78 ± 0.05 mm
Body Width
C
Lead Length (Bulk)(1)
D
Lead Diameter
(1) See "Resistor Packaging Specification Document" for lead length dimension for tape and reel packaged product.
WRF3
WRF1
Type / Code Unit
WRF2
A
Body Length
B
Mechanical Specifications
Performance Characteristics