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.
WRC Series
Conformal Coated Welded 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
• Bulk packaging available – contact Stackpole for
package quantities
• Bulk packaging available – contact Stackpole for package
quantities
Test Test Results
Moisture Resistance ± 5% + 0.05Ω
Thermal Shock ± 2% + 0.05Ω
Load Life @ 70ºC - 1,000 hrs. ± 5% + 0.05Ω
Shock and Vibration ± 1% + 0.05Ω
Resistance to Soldering Heat ± 2% + 0.05Ω
Short Time Overload ± 3% + 0.05Ω
Operating Temperature Range -55ºC to +250ºC
Maximum Dielectric
Size Working Withstanding
Voltage Voltage (RMS)
WRC1S 0309 1W √PR 700V -80 ppm/ºC ~ +900 ppm/ºC 0.1 - 100
WRC1 0410 1W √PR 700V -80 ppm/ºC ~ +900 ppm/ºC 0.1 - 470
WRC2A 0416 2W √PR 700V -80 ppm/ºC ~ +900 ppm/ºC 0.1 - 470
WRC3A 0416 3W √PR 700V -80 ppm/ºC ~ +900 ppm/ºC 0.1 - 470
WRC4A 0416 4W √PR 700V -80 ppm/ºC ~ +900 ppm/ºC 0.1 - 470
WRC5A 0416 5W √PR 700V -80 ppm/ºC ~ +900 ppm/ºC 0.1 - 470
WRC3B 0617 3W √PR 700V -80 ppm/ºC ~ +900 ppm/ºC 0.1 - 680
WRC4B 0617 4W √PR 700V -80 ppm/ºC ~ +900 ppm/ºC 0.1 - 680
WRC5B 0617 5.5W √PR 700V -80 ppm/ºC ~ +900 ppm/ºC 0.01 - 680
Type / Code Power Rating
(Watts) @ 25ºC
Resistance Temperature
Coefficient
Ohmic Range (Ω)
and Tolerance
5%
Electrical Specifications
0.354 max 0.138 max 1.102 ± 0.079 0.024 ± 0.002 inches
9.00 max 3.50 max 28.00 ± 2.00 0.60 ± 0.05 mm
0.394 max 0.161 max 1.102 ± 0.079 0.028 ± 0.002 inches
10.00 max 4.10 max 28.00 ± 2.00 0.72 ± 0.05 mm
0.492 max 0.217 max 1.102 ± 0.118 0.028 ± 0.002 inches
12.50 max 5.50 max 28.00 ± 3.00 0.72 ± 0.05 mm
0.630 max 0.236 max 1.102 ± 0.118 0.028 ± 0.002 inches
16.00 max 6.00 max 28.00 ± 3.00 0.72 ± 0.05 mm
Unit
WRC1
WRC2A, WRC3A,
WRC4A, WRC5A
A
Body Length
B
(1) See "Resistor Packaging Specification Document" for lead length dimension for tape and reel packaged product.
Body Width
C
Lead Length (Bulk) (1)
D
Lead Diameter
WRC3B, WRC4B,
WRC5B
WRC1S
Type / Code
Mechanical Specifications
Performance Characteristics
Rev Date: 07/27/2012 2 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.
WRC Series
Conformal Coated Welded Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Power Derating Curve:
120
100
80
60
40
20
0
200 25025 50 100 150
1S, 1
2A, 3A, 4A, 5A
3B, 4B, 5B
Ambient Temp. (ºC)
% of Rated Powe
r
85ºC
225
How to Order
1234567891011
WRC2AJA300R
Size
WRC 1S Code Code Quantity
1J 5,000
2A 2,000
3A 1,000
4A 2,000
5A 1,000
3B
4B
5B
Standard 1W Tol
Product Series Power Tolerance
Description Size
Resistance Value
3W
1S
T Tape & Reel
10 ohm = 10R0
4W
3W
1, 2A, 3A, 4A, 5A, 3B, 4B, 5B
0.1 ohm = R100
5W
1 ohm = 1R00
AAmmo
Four characters with
the multiplier used as
the decimal holder.
"L" used as multiplier
of 10
-3
for any value
under 0.1 ohm.
Packaging
5.5W
5%
0.01 ohm = 10L0
4W 1S
1W
1, 2A, 3A, 4A, 5A 2W
3B, 4B, 5B
Legacy Part Number (before January 3, 2011):
Nominal
Resistance
300
T
yp
e Descri
p
tion Size Power Tolerance
V
alues T
yp
ePk
g
Qt
y
Descri
p
tion Code
WRC Standard 1S 1W 5% E24 1S 5,000
1 1W 1, 2A, 3A, 4A, 5A 2,000
2A 2W 3B, 4B, 5B 1,000
3A 3W 1S 2,000
4A 4W 1, 2A, 3A, 4A, 5A, 3B, 4B, 5B 1,000
5A 5W
3B 3W
4B 4W
5B 5.5W
A
A
Packaging
Tape and Reel R
WRC
SEI Type Code
2A
Tolerance
5%
Ammo