Commercial Grade Metal Film Resistor CMF Series • Metal film resistor • Conformal coating • Power ratings from 1/8W to 3W • Resistance range from 10Ω to 1MΩ 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 CMF-1/8 0.125 200 400 400 CMF-1/4 0.25 250 500 500 CMF-1/2 0.5 350 700 700 10 - 1M 1 100 CMF-1 1 500 1000 1000 CMF-2 2 500 1000 1000 CMF-3 3 500 1000 1000 Environmental Data Short-time overload ΔR/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 ΔR/R ≤(±1% + 0.05Ω), with no evidence of mechanical damage. Pulse Overload ΔR/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 ΔR/R ≤(±1% + 0.05Ω), with no evidence of mechanical damage. Load life in humidity Standard type: ΔR/R ±3% for <100KΩ, ±5% for ≥100KΩ; Load life Standard type: ΔR/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 going to print. © 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 A subsidiary of TT electronics plc CMF Series Issue May 2009 Sheet 1 of 3 Commercial Grade Metal Film Resistor Physical Data d D H L H Dimensions (mm) Standard Size IRC Type D (max.) L (max.) d (±0.02) H (±3) 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 © 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 CMF Series Issue May 2009 Sheet 2 of 3 Commercial Grade Metal Film Resistor Derating Curve Hot Spot Temperature Curve +155°C +70°C -55°C 200 Percent Rated Load (%) 100 Measuring position 80 150 CMF-200 60 100 CMF-100 50 CMF-50 CMF-25 CMF-12 40 20 0 -60 -30 0 30 60 90 120 150 180 25 50 75 100 Ambient Temperature (°C) Ordering Data Specify type, resistance, tolerance, RoHS-Compliance and packaging. This example is for a Metal Film Resistor, 1-watt, 1000Ω resistor. Sample Part No. CMF - 1 1001 F LF TR 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: 100 ohms = 1000, 1000 ohms = 1001 (>100Ω - "R" is used to designate decimal) Example: 10Ω = 10R0, 1Ω = 1R00, 51Ω = 51R0 Tolerance F = ±1%; G = ±2%; J = ±5% RoHS- compliance LF = RoHS compliant construction Packaging 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 CMF Series Issue May 2009 Sheet 3 of 3