features thick lm technology power rating of 2 watts at 70 ? rohs compliant* applications power supplies stepper motor drives crm2512 - pulse resistant power resistor *rohs directive 2002/95/ec jan. 27, 2003 including annex and rohs recast 2011/65/eu june 8, 2011. speci cations are subject to change without notice. users should verify actual device performance in their speci c applications. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. general information the bourns crm2512 series is a thick- lm power resistor with a rating of 2 watts in a standard 2512 chip format. this product has a very wide resistance range making it suitable for different applications in power supply circuits including current sensing and inrush current limiting. *rohs compliant dimensions: mm (inches) electrical characteristics product dimensions derating curve characteristic data test r max. load life (1000 hours) 1 % tolerance < 1 % 5 % tolerance < 3 % short term overload 1 % tolerance < 1 % 5 % tolerance < 2 % thermal shock 1 % tolerance < 0.5 % 5 % tolerance < 1 % 6.3 0.20 (0.248 0.008) top side 3.1 0.20 (0.122 0.008) 0.6 0.20 (0.024 0.008) 0.6 0.20 (0.024 0.008) 1.8 0.20 (0.070 0.008) ambient temperature (c) 70 155 100 -55 power ratio (%) recommended solder pad layout soldering pro le 50 100 150 200 250 temperature (c) 90 30 seconds pre-heating zone 150 c 230 c or higher peak 260 +5/-0 c 180 c 30 10 seconds heating time soldering zone for standard values used in capacitors, inductors, and resistors, click here. notes: (1) crm 2512 2 w loading with total solder pad and trace size of 300 mm 2 . (2) e = (pxr) 1/2 e: working voltage (v); p: rated power (w); r: resistance value ( ) (3) jumper (0 ): rated current 6 a maximum with 300 mm 2 pad. characteristic model crm2512 (0.110 to 0.91 ) model crm2512 (0 , 1.0 to 1.0 m) power rating @ 70 ? 2 w operating temp. range -55 ? to +155 ? derated to zero load at +155 ? maximum working voltage 1349 mv 300 v maximum overload voltage 2698 mv 600 v insulation resistance > 1000 m resistance range 0.110 - 0.91 (e24 values) 0 , 1.0 - 1 m (e24 values) 1 - 9.1 (e24 values) 10 - 1 m (e96 values) resistance tolerance ? % & ? % ? % ? % temperature coef cient ?00 ppm/? ?00 ppm/? ?00 ppm/? 7.6 (.299) 3.7 (.146) 2.45 (.096)
speci cations are subject to change without notice. users should verify actual device performance in their speci c applications. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. crm2512 - pulse resistant power resistor pulse load characteristics (r > 1 ohm) how to order crm 2512 - f x - r100 e lf model (crm = precision chip resistor) size 2512 = 2512 size resistance tolerance ? f = 1 % ? j = 5 % tcr (ppm/c - see electrical characteristics chart) ? w = 200 ppm/c ? x = 100 ppm/c resistance value r <1 ohm (1 % or 5 % tolerance: r (decimal point) followed by three signi? cant digits (example: r100 = 0.100 ohm 1% tolerance: <100 ohms ....... r represents decimal point (example: 24r3 = 24.3 ohms) 100 ohms ....... first three digits are signi? cant, fourth digit represents number of zeros to follow (example: 8252 = 82.5k ohms) 5% tolerance: <10 ohms ......... r represents decimal point (example: 4r7 = 4.7 ohms) 10 ohms ......... first two digits are signi? cant, third digit represents number of zeros to follow (example: 474 = 470k ohms) packaging ? e = 4000 pieces on 180 mm (7 inch) reel termination ? lf = tin-plated (rohs compliant) 1000 100 10 1 0.0001 0.001 surge duration (s) peak power (w) 0.01 1.0
rev. 03/13 speci cations are subject to change without notice. users should verify actual device performance in their speci c applications. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. crm2512 - pulse resistant power resistor packaging dimensions (conforms to eia rs-481a) 3.60 0.20 (0.142 0.008) 2.0 0.05 (0.079 0.002) 4.0 0.05 (0.157 0.002) 4.0 0.1 (0.157 0.004) 1.5 +0.1/-0 (0.059 +0.004/-0) dia. 1.5 (0.059) dia. min. 0.85 0.15 (0.033 0.006) 6.9 0.2 (0.272 0.008) 5.5 0.05 (0.217 0.002) 1.75 0.1 (0.069 0.004) 12.0 0.2 (0.472 0.008) top tape paper tape resistor user direction of feed 60.0 (2.362) min. dia. dia. 180 +0/-3 (7.09 +0/-0.118) 13.0 1.0 (0.512 0.039) dia. 15.4 2.0 (0.606 0.079) 13.0 1.0 (0.512 0.039) dimensions: mm (inches)
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