www.vishay.com n1 CSM vishay foil resistors document number: 63089 revision 29-apr-03 vishay foil ?france +33.4.93.37.28.24 fax: +33.4.93.37.27.31 ?germany +49.9287.710 fax: +49 9287.70435 ?israel +972.3.557.0945 fax: +972.3.558.9121 ?italy + 39.2.300.11919 fax: +39.2.300.11999 ?japan +81.3.5464.6411 fax: +81.3.5464.6433 ?singapore +65.788.6668 fax: +65.788.0988 ?sweden +46.8.594.70590 fax: +46.8.594.70581 ?uk +44 191 514 8237 fax: +44 1953 457 722 ?usa +1 610 407-4800 fax: +1 610 640-9081 bulk metal technology high precision, current sensing, power surface mount, metal strip resistor features low ohmic values: 2m ? to 200m ? low temperature coefficient: 15ppm/ c (3m ? up) precision tolerances: down to 0.1% four terminal (kelvin) design: allows for precision accurate measurements surface mount configuration power rating: 1 to 3 watts the CSM series of low value current sense resistors provides power and precision in a four terminal, surface mount configuration. its all welded construction is made up of a bulk metal resistive element with 60/40 tin/lead plated copper terminations. it is suitable for all types of precision current sensing, voltage division, and pulse applications including switching and linear power supplies, instruments, and power amplifiers. table 1 - performance specifications parameter CSM2512 CSM3637 resistance range 3m ? - 200m ? 2m ? - 200m ? power rating at 70 c 1 watt 3 watts (2m ? - 10m ? ) 2 watts (> 10m ? - 200m ? ) tightest tolerance (0.1% + 0.01m ? ) temperature coefficient (- 55 c to + 125 c) 15ppm/ c 25ppm/ c (2m ? - < 3m ? ) 15ppm/ c (3m ? - 200m ? ) operating t emperature range -55 c to + 125 c; ref. + 25 c weight (maximum) 0.09 grams 0.29 grams figure 1 - power derating curve -65 -50 -25 0 25 50 75 100 125 150 170 ambient temperature c +70 c 100 80 60 40 20 0 percent of rated power product may not be to scale
document number: 63089 revision 29-apr-03 www.vishay.com n2 CSM vishay foil resistors vishay foil ?france +33.4.93.37.28.24 fax: +33.4.93.37.27.31 ?germany +49.9287.710 fax: +49 9287.70435 ?israel +972.3.557.0945 fax: +972.3.558.9121 ?italy + 39.2.300.11919 fax: +39.2.300.11999 ?japan +81.3.5464.6411 fax: +81.3.5464.6433 ?singapore +65.788.6668 fax: +65.788.0988 ?sweden +46.8.594.70590 fax: +46.8.594.70581 ?uk +44 191 514 8237 fax: +44 1953 457 722 ?usa +1 610 407-4800 fax: +1 610 640-9081 bulk metal technology high precision, current sensing, power surface mount, metal strip resistor h a w b t l e i a d c b i a d c b h a w b t l CSM3637 dimensions CSM2512 dimensions model resistance range, m ? lwht a b 3 to < 5 0.083 (2.108) CSM2512 5 to < 7 0.25 0.125 0.025 0.047 0.030* 0.025* (6.35) (3.175) (0.635) (1.194) (0.762) (0.635) 7 to 200 0.032 (0.813) CSM3637 2 to 200 0.360 0.370 0.025 0.086 0.061 0.032 (9.14) (9.4) (0.635) (2.18) (1.55) (0.813) figure 2 - dimensions and imprinting in inches (millimeters) #white dot indicates top side of part for mounting purposes. model a b c d e i CSM2512 0.125 0.130 0.030 0.020 0.055 0.065 (3.18) (3.30) (0.76) (0.51) (1.40) (1.65) CSM3637 0.116 0.366 0.066 0.024 - 0.178 (2.95) (9.30) (1.68) (0.61) (4.52) land pattern dimensions - tolerances 0.003 ( 0.076) # # CSM2512 land pattern CSM3637 land pattern dimensions - tolerances 0.010 ( 0.254), * 0.015 ( 0.381) model resistance value letter designator* tolerance packaging CSM b = 0.1% w = waffle 2512 3m ? - 200m ? rc = 0.25% pack CSM d = 0.5% t = tape and 3637 2m ? - 200m ? f = 1.0% reel *resistance value in ohms, is expressed by a series of 6 characters, 5 of which represent significant digits while the 6th lett er designates the location of the comma or decimal. example 0r0100 = 0.010 ? table 2 - ordering information e 1 e 2 i 1 i 2 e 1 e 2 i 1 i 2 kelvin connection i 1 , i 2 - power e 1 , e 2 - sense
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