CMF Series
Commercial Grade Metal Film Resistor
IRC Wire and Film Technologies Division
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EIA standard color coding
Low noise & voltage coefficient
Flame retardant type available
Low temperature coefficient range
Epoxy coating on metal film provides superior moisture protection
Nichrome resistive element provides stable performance
Specifications
Power
Rating at
70°C (W)
Resistance
Range
(Ohms)
Tolerance
(
±%
)
Max.
Working
Voltage (V)
Max.
Overload
Voltage (V)
Dielectric
Withstanding
Voltage (V)
IRC Type
TCR
(
±
ppm/°C)
Standard Size
CMF-1/8
CMF-1/4
CMF-1/2
CMF-1
CMF-2
CMF-3
0.125
0.25
0.5
1
2
3
10 - 1M
10 - 1M
10 - 1M
10 - 1M
10 - 1M
10 - 1M
1
1
1
1
1
1
100
100
100
100
100
100
200
250
350
500
500
500
400
500
700
1000
1000
1000
400
500
700
1000
1000
1000
Environmental Performance
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%
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
CMF Series Issue February 2007
CMF Series
Commercial Grade Metal Film Resistor
IRC Wire and Film Technologies Division
Dimensions (mm)
d
D
H
L
H
IRC Type
Standard Size
CMF-1/8
CMF-1/4
CMF-1/2
CMF-1
CMF-2
CMF-3
D (max.)
1.85
2.5
3.5
5.0
5.5
6.5
L (max.)
3.5
6.8
10.0
12.0
16.0
17.5
d (±0.02)
0.5
0.6
0.6
0.7
0.8
0.8
H (±3)
28
28
28
28
28
28
Performance Curves
Derating Curve
100
Percent rated load (%)
-55°C
+70°C
+155°C
Ordering Data
Specify type, resistance, tolerance, RoHS-Compliance
and packaging. This example is for a Metal Film
Resistor, 1-watt, 1000
Ω
resistor.
Sample Part No.
IRC Type
CMF - Metal Film Resistor
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
(>100Ω - “R” is used to
designate decimal)
Example:
10Ω = 10R0;
1Ω = 1R00
51Ω = 51R0
Tolerance (EIA format)
F = ±1%
G = ±2%
J = ±5%
RoHS- compliance
LF = RoHS compliant construction
Packaging
AMMO = ammo packaging
TR = tape and reel
CMF 1
1001
F
LF
AMMO
80
60
40
20
-60 -30
0
30 60
90 120
150 180
Ambient temperature (
°
C)
Hot Spot Temperature
200
Measuring position
Surface Temp. Rise (ºC)
150
MF-200
100
50
0
MF-100
MF-50
MF-25
MF-12
25
50
75
100
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
CMF Series Issue February 2007
PCB Design
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