www.vishay.com 42 PCT vishay dale document number 30223 revision 28-aug-02 for technical questions, contact ww2aresistors@vishay .com wirewound resistors, commercial power, printed circuit board, tab type terminals features variety of core lengths terminals designed for direct mounting into a circuit board to be securely clamped available potted in a ceramic case to increase power dissipation, contact factory by using the e-mail address at the bottom of this page ordering information *PCT-4000 model numbers are calculated from the power rating of 4 watts per inch. the last three digits of the model number re present the mounting center spacing of the resistors in inches (decimal is between the first and second digit, mounting center spacing is available between 0.50 [12.70mm] and 2.15 [54.61mm]. example: PCT-4150 = 1.50 inches x 4 watts per inch = 6 watts. technical specifications parameter unit PCT-4000 resistor characteristics power rating w 4 per inch temperature coefficient ppm/ c 600 below 1.0 ? , 300 1.0 ? and above short time overload - 5 x rated power for 5 seconds maximum working voltage v (p x r) 1/2 operating temperature range c - 65/+ 375 terminal strength lb 10 minimum standard electrical specifications model* power rating resistance range weight p 25 c ? (typical) w 10% standard, 5% available g PCT-4050 2.0 0.10 - 390 0.57 PCT-4065 2.6 0.14 - 560 0.59 PCT-4085 3.4 0.20 - 785 0.62 PCT-4105 4.2 0.25 - 1.01k 0.65 PCT-4145 5.8 0.36 - 1.46k 0.71 PCT-4185 7.4 0.47 - 1.91k 0.77 PCT-4215 8.6 0.56 - 2.25k 0.81 PCT-4150 300 ? 10% model resistance tolerance ? % example: a 1.50 inch mounting center spacing (at 4 watts per inch), 300 ohm, 10% unit is designated as shown. total wattage of unit is 6 watts (4 watts per inch x 1.50 inch).
www.vishay.com 43 PCT vishay dale document number 30223 revision 28-aug-02 for technical questions, contact ww2aresistors@vishay .com dimensions in inches [millimeters] PCT-4000 wirewound resistors, commercial power, printed circuit board, tab type terminals material specifications element: nickel-chrome alloy or copper-nickel alloy, depending on resistance value core: woven fiberglass terminals: electro tin plated steel part marking: none 0.146 [3.71] 0.010 [0.254] 0.018 [0.457] minimum 120 100 80 60 40 20 0 rated power in % ambient temperature in c 25 -65 -50 0 75 150 225 300 375 performance test conditions of test test limits (eia rs-344) thermal shock -55 c to + 275 c, 5 cycles, 30 minute dwell time (5.0% + 0.05 ? ) ? r short time overload 5 x rated power for 5 seconds (4.0% + 0.05 ? ) ? r low temperature operation - 65 c, full rated working voltage for 45 minutes (3.0% + 0.05 ? ) ? r humidity 75 c, 90% - 100% rh, 240 hours (5.0% + 0.05 ? ) ? r load life 1000 hours at rated power, + 25 c, 1.5 hours "on", 0.5 hours "off" (10.0% + 0.05 ? ) ? r resistance to solder heat terminal immersed 3.5 seconds in molten solder at 1/8" to 3/16" from body (4.0% + 0.05 ? ) ? r 0.180 [4.57] 0.005 [0.127] 0.030 [0.76] 0.005 [0.127] 0.055 [1.40] 0.005 [0.127] 0.105 [2.67] typical 0.150 [3.81] 0.005 [0.127] 0.500 0.032 [12.70 0.813] mounting centers 0.500 0.020 to 2.15 0.020 [12.70 0.508 to 54.61 0.508]
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