General Note
A subsidiary of
TT electronics plc
CMF Series Issue February 2007
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
Telephone: 828 264 8861 • Facsimile: 828 264 8866 • Website: www.irctt.com
• 736 Greenway Road Boone, North Carolina 28607-1860
IRC Wire and Film Technologies Division
• 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
Commercial Grade Metal Film Resistor
CMF Series
Environmental Performance
Short-time overload ∆R/R ≤ (±0.5%+0.05Ω), with no evidence of mechanical damage.
Dielectric withstanding voltage No evidence of flashover, mechanical damage, arcing or insulation breakdown.
Terminal strength No evidence of mechanical damage.
Resistance to Soldering heat ∆R/R ≤ (±1%+0.05Ω), with no evidence of mechanical damage.
Pulse Overload ∆R/R ≤ (±1%+0.05Ω), with no evidence of mechanical damage.
Solderability Minimum 95% coverage.
Resistance to solvent No deterioration of protective coating and markings.
Temperature cycling ∆R/R ≤ (±1%+0.05Ω), with no evidence of mechanical damage.
Load life in humidity Standard type: ∆R/R ±3% for <100KΩ, ±5% for ≥100KΩ;
Load life Standard type: ∆R/R ±1.5% Flame retardant type: R/R ±5%
Standard Size
CMF-1/8 0.125 10 - 1M 1 100 200 400
CMF-1/4 0.25 10 - 1M 1 100 250 500 500
CMF-1/2 0.5 10 - 1M 1 100 350 700 700
CMF-1 1 10 - 1M 100 500 1000 1000
CMF-2 2 10 - 1M 100 500 1000 1000
CMF-3 3 10 - 1M 1 100 500 1000 1000
Max.
Working
Voltage (V)
Max.
Overload
Voltage (V)
Dielectric
Withstanding
Voltage (V)
IRC Type
Power
Rating at
70°C (W)
Resistance
Range
(Ohms)
Tolerance
(±%)
TCR
(±ppm/°C)
400
1
1
General Note
A subsidiary of
TT electronics plc
CMF Series Issue February 2007
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
Telephone: 828 264 8861 • Facsimile: 828 264 8866 • Website: www.irctt.com
• 736 Greenway Road Boone, North Carolina 28607-1860
IRC Wire and Film Technologies Division
IRC Type D (max.) L (max.) d (±0.02) H (±3)
Standard Size CMF-1/8 1.85 3.5 0.5 28
CMF-1/4 2.5 6.8 0.6 28
CMF-1/2 3.5 10.0 0.6 28
CMF-1 5.0 12.0 0.7 28
CMF-2 5.5 16.0 0.8 28
CMF-3 6.5 17.5 0.8 28
Dimensions (mm)
Performance Curves Ordering Data
IRC Type
CMF - Metal Film Resistor
Sample Part No. CMF 1 1001 F LF AMMO
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
(>
100
Ω - “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
D
d
H HL
-55°C
Derating Curve
100
80
60
40
20
+70°C +155°C
Ambient temperature (°C)
Percent rated load (%)
-60 -30 0 30 60 90 120 150 180
Surface Temp. Rise (ºC)
200
150
100
50
0
MF-200
MF-100
MF-50
MF-25
MF-12
25 50 75 100
Hot Spot Temperature
Measuring position
Specify type, resistance, tolerance, RoHS-Compliance
and packaging. This example is for a Metal Film
Resistor, 1-watt, 1000Ω resistor.
Commercial Grade Metal Film Resistor
CMF Series
