Commercial Grade
Metal Oxide Resistor
Power Derating Curve
Percent Rated Load (%)
100
80
60
40
20
0
-60 -40 -20
0
20
CMO 1/4W - 1/2W
CMO 1W - 9W
-55°C
70°C
130°C
235°C
40 60 80 100 120 140 160 180 200 240
Ambient Temperature (°C)
Temperature Rise Chart
Temperature Rise (°C)
250
200
150
100
50
0
25
50
75
7W, 8W, 9W
5W
3W
2W
1W
1/4W, 1/2W
Ordering Data
Specify type, resistance, tolerance, RoHS-Compliance and packaging.
This example is for a Metal Oxide Resistor, 2-watt, 1000Ω resistor.
Sample Part No.
IRC Type
Power Rating
CMO
2
1001
J
LF
TR
(See specs table)
(≥100Ω - First 3 significant digits plus 4th digit multiplier)
Example: 100Ω = 1000, 1000Ω = 1001; 150KΩ = 1503
(>100Ω - "R" is used to designate decimal)
Example: 10Ω = 51R0, 1Ω = 1R00, 0.25Ω = R250
Resistance Value (EIA 4-digit code)
Tolerance (EIA format)
G = ±2%; J = ±5%; K = ±10%
RoHS- compliance
Packaging
LF = RoHS compliant construction
TR = tape and reel only
© IRC Advanced Film Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
CMO Series Issue September 2008 Sheet 4 of 4
IRCTT [ IRC - A TT ELECTRONICS COMPANY. ]
