General Purpose Carbon Film Resistors CF Series • High stability performance • Uniformity of all electrical parameters • Auto sequencing/insertion compatible • Ideal for commercial/industrial applications Electrical Data Tested per MIL-STD-202 CF 1/8 CF 1/4 CF 1/2 1/8 1/4 1/2 Power Rating (watts) at 70°C Derated to 0 Load at 155°C Maximum Working Voltage 200V Operating Temperature Range Resistance Range 350V -55°C to +155°C (±5%) (±2%) 250V 1.0Ω - 22 meg 10Ω - 1 meg 10Ω - 4.7 meg 10Ω - 4.7 meg CF 1/8 CF 1/4 CF 1/2 Environmental Data <100K ± (3% + 0.05Ω) Moisture Resistance >100K ± (5% + 0.05Ω) Thermal Shock ±0.5% <100K ± (2% + 0.05Ω) Load life at 70°C - 1000 hours <100K ± (3% + 0.05Ω) Shock and Vibration ±0.2% Resistance to Soldering Heat ±0.5% Terminal Strength ±0.5% Dielectric Withstand Voltage 300 volts RMS min. 500 volts RMS min. 700 volts RMS min. 400V 600V 700V Maximum Pulse Voltage Insulation Resistance Voltage Coefficient Short Time Overload 10,000 meg min. -10 ppm/Vmax. ±0.75% 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 CF Series Issue August 2008 Sheet 1 of 3 General Purpose Carbon Film Resistors Physical Data B A D A C Dimensions (inches and (mm)) Dimension CF 1/8 CF 1/4 A CF 1/2 1.10 ± .08 (28.0 ± 2.0) B 0.13 + .01/-.00 (3.2 + 0.2/-0.0) 0.24 ± .01 (6.0 ± 0.3) 0.33 ± .02 (8.5 ± 0.5) C 0.018 ± .001 (0.45 ± 0.02) 0.022 ± .001 (0.55 ± 0.03) 0.026 ± .002 (0.65 ± 0.05) D 0.07 ± .01 (1.8 ± 0.15) 0.09 ± .01 (2.3 ± 0.2) 0.11 ± .01 (2.8 ± 0.3) Construction 1 2 3 4 5 6 1. COLOR BANDS. The resistors are permanently color banded for resistance value and tolerance in accordance with EIA specifications. 2. HELIXING. The units are helixed to a predetermined base to final value ratio to obtain the best TCR, noise and stability characteristics. 3. FILM. Carbon-film resistors have a homogeneous film of pure carbon deposited by a pyrolitic process at carefully controlled temperatures. 4. SUBSTRATES. The substrates are of a proprietary non alkaline ceramic, prepared and processed under exacting conditions to guarantee the utmost in uniformity and surface characteristics. 5. INSULATION. The resistors are coated with multiple layers of a baked-on fire-retardant synthetic resin which provides the units with a high degree of mechanical and electrical protection in the most adverse operating conditions. 6. TERMINATIONS. Positive contact is provided to the resistance element by precision-made end caps. The lead wires are attached by using proprietary welding techniques. 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 CF Series Issue August 2008 Sheet 2 of 3 General Purpose Carbon Film Resistors Performance Curves Ordering Data Temperature Coefficient (Typical) Sample Part No. CF - 1/4 102 J BLK Temperature Coefficient (ppm/°C) IRC Type CF -250 Size -500 Resistance Value -750 2 digit range and 1 digit multiplier -1000 Tolerance -1250 G = 2% J = 5% K = 10% -1500 Packaging -1750 BLK = Bulk -2000 10 100 1K 10K 100K 1M 10M Ambient Temperature (°C) Derating Curve (Typical) Percent rated load (%) 100 80 60 40 20 0 0 20 40 60 80 100 120 140 160 Ambient Temperature (°C) Current Noise (Typical) 1.0 -10 0.32 -20 0.10 -30 0.032 -40 100 Noise Voltage (µv/v) Noise Index (db) 0 0.010 1K 10K 100K 1M 10M Resistance (ohms) 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 CF Series Issue August 2008 Sheet 3 of 3