WRF Series
Conformal Coated Wirewound Resistor
Features:
•
•
•
•
Conformal coating
Flameproof construction
Cut and formed product is available on select sizes
Contact factory for details
RoHS compliant / lead-free
Stackpole Electronics, Inc.
Resistive Product Solutions
Electrical Specifications
Type / Code
WRF1
WRF2
WRF3
Power Rating
(Watts) @ 25ºC
1W
2W
3W
Maximum
Working
Voltage
√PR
√PR
√PR
Dielectric
Withstanding
Voltage (RMS)
700V
700V
700V
Resistance Temperature
Coefficient
-80ppm/ºC ~ +900ppm/ºC
-80ppm/ºC ~ +900ppm/ºC
-80ppm/ºC ~ +900ppm/ºC
Ohmic Range (Ω )
and Tolerance
5%
0.1 - 33
0.1 - 220
0.1 - 220
Mechanical Specifications
Type / Code
WRF1
WRF2
WRF3
A
Body Length
0.433
11.00
0.630
16.00
0.630
16.00
max
max
max
max
max
max
B
Body Width
0.197
5.00
0.197
5.00
0.197
5.00
max
max
max
max
max
max
1.102
28.00
1.102
28.00
1.102
28.00
C
Lead Length (Bulk)(1)
±
±
±
±
±
±
0.118
3.00
0.118
3.00
0.118
3.00
0.031
0.78
0.031
0.78
0.031
0.78
D
Lead Diameter
±
±
±
±
±
±
0.002
0.05
0.002
0.05
0.002
0.05
Unit
inches
mm
inches
mm
inches
mm
(1) See "Resistor Packaging Specification Document" for lead length dimension for tape and reel packaged product.
Performance Characteristics
Test
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)
-55ºC to +225ºC (WRF 3)
Test Results
85ºC
Open circuit within 2 minutes
± 3% + 0.05Ω
± 2% + 0.05Ω
4
>10 MΩ
± 2% + 0.05Ω
± 5% + 0.05Ω
± 5% + 0.05Ω
± 1% + 0.05Ω
90% tin covered min.
-80ppm/ºC ~ +900ppm/ºC
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
www.seielect.com
marketing@seielect.com
WRF Series
Conformal Coated Wirewound Resistor
Power Derating Curve:
100
Stackpole Electronics, Inc.
Resistive Product Solutions
Percent Rated Power (%)
75
50
WRF3
25
WRF1, WRF2
0
50
85 100
150
200
225
250
300
Ambient Temperature (ºC)
How to Order
1
2
3
4
5
6
7
8
9
10
W
R
F
2
J
B
1
0
R
0
Product Series
Conformal
WRF
Coated WW
Size Power Rating
1W
1
2W
2
3W
3
Tolerance
Code Tol Value
5%
J
E24
Code
T
A
B
Packaging
Description
Size
All Sizes
Tape and Reel
Ammo
All Sizes
Bulk
Resistance Value
Quantity
2,000
1,000
Four characters with
the multiplier used as
the decimal holder.
0.1 ohm = R100
1 ohm = 1R00
100 ohm = 100R
Legacy Part Number (before January 3, 2011):
SEI Type
Code
Nominal Resistance
Tolerance
Packaging
WRF
Type
WRF
Description
Conformal Coated WW
2
Code
1
2
3
10R
5%
Tol Values
5% E24
Type
All
All
All
Pkg Qty
1,000
2,000
1,000
A
Description
Bulk
Tape and Reel
Ammo
Code
A
R
T
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.
2
www.seielect.com
marketing@seielect.com
