Commercial Grade
Metal Oxide Resistor
CMO Series
•
•
•
•
•
•
High purity ceramic core
Non-inductive type available
Superior flame retardant coating
Power ratings from 1/4W to 9W
Meets EIA-RC2655A requirements
Stable performance in harsh environments
Electrical Data
IRC Type
Power
Rating at
70°C (W)
Resistance
Range*
(Ohms)
Tolerance
(±%)
TCR
(±ppm/°C)
Max.
Working
Voltage (V)
Max.
Overload
Voltage (V)
Dielectric
Withstanding
Voltage (V)
Standard Size
CMO-1/4
CMO-1/2
CMO-1
CMO-2
CMO-3
CMO-5
CMO-7
CMO-8
CMO-9
Miniature Size
CMO-1/2S
CMO-1S
CMO-2S
CMO-3S
CMO-5SS
CMO-5S
0.5
1
2
3
5
5
0.3 - 50K
0.3 - 50K
0.3 - 50K
2, 5, 10
0.3 - 50K
5 - 100K
5 - 150K
350
350
500
500
600
800
800
350
500
500
250
350
350
400
600
600
250
350
350
0.25
0.5
1
2
3
5
7
8
9
0.3 - 50K
0.3 - 50K
0.3 - 50K
0.3 - 50K
5 - 100K
5 - 150K
20 - 150K
30 - 200K
50 - 200K
2, 5, 10
350
250
250
350
350
500
750
750
750
750
400
400
600
600
800
1000
1000
1000
1000
250
250
350
350
500
750
750
750
750
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print.
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
A subsidiary of
TT electronics plc
CMO Series Issue September 2008 Sheet 1 of 4
Commercial Grade
Metal Oxide Resistor
Environmental Data
Short-time overload
Dielectric withstanding voltage
Terminal strength
Resistance to Soldering heat
Pulse Overload
Solderability
Resistance to solvent
Temperature cycling
Load life in humidity
Load life
∆R/R
≤(±0.5%
+ 0.05Ω), with no evidence of mechanical damage.
No evidence of flashover, mechanical damage, arcing or insulation breakdown.
No evidence of mechanical damage.
∆R/R
≤(±1%
+ 0.05Ω), with no evidence of mechanical damage.
∆R/R
≤(±1%
+ 0.05Ω), with no evidence of mechanical damage.
Minimum 95% coverage.
No deterioration of protective coating and markings.
∆R/R
≤(±1%
+ 0.05Ω), with no evidence of mechanical damage.
Standard type:
∆R/R
±3% for <100KΩ, ±5% for
≥100KΩ;
Standard type:
∆R/R
±1.5% Flame retardant type: R/R ±5%
Wire and Film Technologies 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 2 of 4
Commercial Grade
Metal Oxide Resistor
Physical Data
d
D
H
L
H
Dimensions (mm)
IRC Type
Standard Size
CMO-1/4
CMO - 1/2
CMO-1
CMO-2
CMO-3
CMO-5
CMO-7
CMO-8
CMO-9
Miniature Size
CMO - 1/2S
CMO-1
CMO-2
CMO-3
CMO-5SS
CMO-5S
D (max.)
2.5
4.0
5.0
5.5
6.5
8.5
8.5
8.5
8.5
3.0
4.5
5.0
5.5
6.5
8.0
L (max.)
7.5
10.0
12.0
16.0
17.5
26.0
32.0
41.0
54.0
7.5
10.0
12.0
16.0
17.5
25.0
d (±0.02)
0.6
0.6
0.7
0.8
0.8
0.8
0.8
0.8
0.8
0.6
0.7
0.7
0.8
0.8
0.8
H (±3)
28
28
28
28
28
38
38
38
38
28
28
28
28
28
38
• Standard gray base color for standard size product; Blue color for miniature size product
• Standard non-flammable coating
Wire and Film Technologies 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 3 of 4
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
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