CMO Series
Commercial Grade Metal Oxide Resistor
IRC Wire and Film Technologies Division
•
•
•
•
•
•
Power ratings from 1/4W to 9W
Stable performance in harsh environments
Superior flame retardant coating
High purity ceramic core
Meets EIA-RC2655A requirements
Non-inductive type available
Specifications
IRC Type
Power
Rating at
70°C (W)
Resistance
Range*
(Ohms)
Tolerance
(±%)
TCR
(±ppm/ºC)
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
0.3 - 50K
5 - 100K
5 - 150K
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
350
250
350
350
350
500
500
400
600
600
600
800
800
250
350
350
350
500
500
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
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
2, 5, 10
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 printing.
© IRC Wire and Film Technologies Division
• 736 Greenway Road Boone, North Carolina 28607-1860
Telephone: 828 264 8861 • Facsimile: 828 264 8866 • Website: www.irctt.com
A subsidiary of
TT electronics plc
CMO Series Issue February 2007
CMO Series
Commercial Grade Metal Oxide Resistor
IRC Wire and Film Technologies Division
Environmental Performance
Short-time overload
Standard Size,
∆R/R ≤
(±1%+0.05Ω), with no evidence of mechanical damage.
Miniature Size,
∆R/R ≤
(±2%+0.05Ω), with no evidence of mechanical damage.
Dielectric withstanding voltage
Pulse overload
No evidence of flashover, mechanical damage, arcing or insulation breakdown.
Standard Size,
∆R/R ≤
(±2%+0.05Ω), with no evidence of mechanical damage.
Miniature Size,
∆R/R ≤
(±5%+0.05Ω), with no evidence of mechanical damage.
Terminal strength
Resistance to Soldering heat
Solderability
Resistance to solvent
Temperature cycling
Humidity (Steady state)
Load life in humidity
Load life
Flame retardant
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 ≤
(±2%+0.05Ω), with no evidence of mechanical damage.
∆R/R ≤
(±2%+0.05Ω), with no evidence of mechanical damage.
∆R/R: ≤
±5% for <100KΩ; ±10% for
≥100KΩ.
∆R/R: ≤
±5% for <100KΩ; ±10% for
≥100KΩ.
No evidence of flaming or arcing.
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 printing.
© IRC Wire and Film Technologies Division
• 736 Greenway Road Boone, North Carolina 28607-1860
Telephone: 828 264 8861 • Facsimile: 828 264 8866 • Website: www.irctt.com
A subsidiary of
TT electronics plc
CMO Series Issue February 2007
CMO Series
Commercial Grade Metal Oxide Resistor
IRC Wire and Film Technologies Division
Dimensions (mm)
Od
D
H
L
H
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 Sizes
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
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 printing.
© IRC Wire and Film Technologies Division
• 736 Greenway Road Boone, North Carolina 28607-1860
Telephone: 828 264 8861 • Facsimile: 828 264 8866 • Website: www.irctt.com
A subsidiary of
TT electronics plc
CMO Series Issue February 2007
IRC Wire and Film Technologies Division
Performance Curves
Derating Curve
Percent rated load (%)
Temperature rise (C)
100
80
60
40
20
0
-60 -40 -20
0
CMO 1/4W-1/2W
MOR 1/4W~1/2W
CMO 1W-9W
MOR 1W~9W
-55°C
70°C
130°C
235°C
Temperature Rise Chart
250
200
150
100
50
0
25
50
7W, 8W, 9W
5W
3W
2W
1W
1/4W, 1/2W
75
20 40 60 80 100 120 140 160 180 200 240
Ambient temperature (°C)
Rated load (%)
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
(See specs table)
Resistance Value (EIA 4-digit code)
(≥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
Tolerance (EIA format)
G = ±2%
J = ±5%
K = ±10%
RoHS- compliance
LF = RoHS compliant construction
Packaging
BLK = bulk packaging
AMMO = ammo packaging
LT = lead tape
TR = tape and reel
General Note
CMO
2 1001 J
LF
AMMO
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 printing.
© IRC Wire and Film Technologies Division
• 736 Greenway Road Boone, North Carolina 28607-1860
Telephone: 828 264 8861 • Facsimile: 828 264 8866 • Website: www.irctt.com
A subsidiary of
TT electronics plc
CMO Series Issue February 2007
