general note irc reserves the right to make changes in product speci cation without notice or liability. all information is subject to irc s own data and is considered accurate at time of going to print. a subsidiary of tt electronics plc ?4222 south staples street ?corpus christi texas 78411 usa wire and film technologies division telephone: 361 992 7900 ?facsimile: 361 992 3377 ?website: www.irctt.com general purpose carbon film resistors electrical data cf series ? high stability performance ? only available as lead free ? auto sequencing/insertion compatible ? ideal for commercial/industrial applications environmental data tested per mil-std-202 cf 1/8 cf 1/4 cf 1/2 power rating (watts) at 70c 1/8 1/4 1/2 derated to 0 load at 155c maximum working voltage 200v 250v 350v operating temperature range -55c to +155c resistance range (5%) 1.0 - 22 m (2%) 10 - 1 m 10 - 4.7 m 10 - 4.7 m cf 1/8 cf 1/4 cf 1/2 moisture resistance <100 k (3% + 0.05 ) >100 k (5% + 0.05 ) thermal shock 0.5% load life at 70c - 1000 hours <100 k (2% + 0.05 ) <100 k (3% + 0.05 ) 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. maximum pulse voltage 400v 600v 700v insulation resistance 10,000 meg min. voltage coef? cient -10 ppm/vmax. short time overload 0.75% cf series issue sept 2009 sheet 1 of 3
?4222 south staples street ?corpus christi texas 78411 usa wire and film technologies division telephone: 361 992 7900 ?facsimile: 361 992 3377 ?website: www.irctt.com physical data general purpose carbon film resistors dimensions (inches and (mm)) dimension cf 1/8 cf 1/4 cf 1/2 a 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. color bands. the resistors are permanently color banded for resistance value and tolerance in accordance with eia speci? cations. 2. helixing. the units are helixed to a predetermined base to ? nal value ratio to obtain the best tcr, noise and stability characteristics. 3. film. carbon-? lm resistors have a homogeneous ? lm 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 ? re-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. b c a a d 1 2 3456 cf series issue september 2009 sheet 2 of 3
?4222 south staples street ?corpus christi texas 78411 usa wire and film technologies division telephone: 361 992 7900 ?facsimile: 361 992 3377 ?website: www.irctt.com performance curves sample part no. irc type cf size resistance value 2 digit range and 1 digit multiplier tolerance g = 2% j = 5% k = 10% packaging blk = bulk ordering data cf - 1/4 102 j blk general purpose carbon film resistors temperature coef? cient (typical) derating curve (typical) current noise (typical) 100 80 60 40 20 0 20 40 percent rated load (%) ambient temperature (c) 60 120 140 160 0 80 100 -250 -500 -750 -1000 -1250 -1500 -1750 -2000 10 100 1k 10k 100k 1m 10m ambient temperature (c) temperature coefficient (ppm/c) 0 -10 -20 -30 -40 100 1k 10k 100k 1m 10m resistance (ohms) noise index (db) 1.0 0.32 0.10 0.032 0.010 noise voltage (v/v) cf series issue september 2009 sheet 3 of 3
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