PSF www.vishay.com vishay dale revision: 13-jul-12 1 document number: 30162 for technical questions, contact: ff2aresistors@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 metal film resistors, high preci sion, high stability, surface mount features ? extremely low tempera ture coefficient of resistance ? molded encapsulation ? wraparound compliant terminations eliminate the risk of solder fillet cracking ? solderable terminations ? excellent stability at different environmental conditions ? for axial-leaded product, see vishay dales ptf datasheet ( www.vishay.com/doc?31019 ) ? material categorization: for definitions of compliance please see www.vishay.com/doc?99912 note ? * lead (pb)-containing terminations are not rohs-compliant. ? exemptions may apply. notes ? marking: print-marked-model, value, tolerance, tc, date code. ? dscc has created a drawing to support the ne ed for a precision 2012-sized pr oduct. vishay dale is list ed as a resource on this drawing as follows:. ? this drawing can be reviewed at: www.landandmaritime.dla.m il/programs/milspec/listdwgs.aspx?doctype=dsccdwg . (1) continuous working voltage shall be or maximum working voltage, whichever is less. note ? for additional information on packaging, refer to the surface mount resistor packaging document ( www.vishay.com/doc?31543 ). standard electrical specifications global ? model size inch power rating p 85 c w maximum working voltage (1) v dc temperature coefficient ppm/c tolerance % resistance range ? encapsulation PSF2012 2012 0.125 200 5, 10, 15, 25 0.01, 0.02, 0.05, 0.1, 0.25, 0.5, 1 15 to 100k epoxy PSF4527 4527 0.25 300 5, 10, 15, 25 0.01, 0.02, 0.05, 0.1, 0.25, 0.5, 1 15 to 500k thermoplastic dscc drawing number vishay dale model power rating p 85 c w resistance range ? tolerance % temperature coefficient ppm/c max. working voltage (1) v dc 02001 PSF2012..1 0.125 15 to 100 k 0.01, 0.02, 0.05, 0.1, 0.25, 0.5, 1 5, 10 200 technical specifications parameter unit PSF2012 PSF4527 rated dissipation at 85 c w 0.125 0.25 limiting elem ent voltage v ? 200 300 insulation voltage (1 min) v eff > 500 thermal resistance k/w < 1300 < 520 insulation resistance ?? 10 11 category temperature range c - 55 to + 150 failure rate 10 -9 /h < 1 weight/1000 pieces (typical) g 90 760 global part number information new global part numbering: PSF201220k 50byta (preferred part number format) PSF2012 20k50 b y ta global model resistance value tolerance code temp. coefficient packaging special PSF2012 PSF4527 r = ? k = k ? 15r00 = 15 ? 1k000 = 1 k ? 500k0 = 500 k ? t = 0.01 % q = 0.02 % a = 0.05 % b = 0.1 % c = 0.25 % d = 0.5 % f = 1 % z = 5 ppm/c y = 10 ppm/c x = 15 ppm/c e = 25 ppm/c 0 = special ek = lead (pb)-free, bulk ea = lead (pb)-free, t/r blank = standard (dash number) (up to 2 digits) from 1 to 99 as applicable ba = tin/lead, bulk ta = tin/lead, t/r (full) p x r
PSF www.vishay.com vishay dale revision: 13-jul-12 2 document number: 30162 for technical questions, contact: ff2aresistors@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 thermal resistance derating note ? embossed ca rrier tape per eia-481. dimensions in inches (millimeters) model l h t w w 1 PSF2012 0.200 0.020 (5.08 0.508) 0.096 0.015 (2.44 0.381) 0.040 0.010 (1.02 0.254) 0.125 0.005 (3.18 0.127) 0.050 0.005 (1.27 0.127) PSF4527 0.455 0.020 (11.56 0.508) 0.167 0.010 (4.24 0.254) 0.100 0.010 (2.54 0.254) 0.275 0.005 (6.98 0.127) 0.215 0.005 (5.46 0.127) solder pad dimensions in inches (millimeters) model a b l PSF2012 0.085 (2.16) 0.070 (1.78) 0.080 (2.03) PSF4527 0.155 (3.94) 0.230 (5.94) 0.205 (5.21) w l t h w 1 l a b 200 150 100 50 0 0 0.5 1.0 1.5 2.0 power in w PSF2012 PSF4527 heat rise in c (above ambient) 120 100 80 40 0 - 55 0 25 200 ambient temperature in c rated power in % 60 20 - 25 175 150 125 100 75 50 85 material specifications element precision deposited nick el chrome alloy with controlled annealing encapsulation molded epoxy on the 2012 and molded thermoplastic on the 4527 core fire-cleaned high purity ceramic termination standard leadframe material is solder-coated copper on the 2012 and solder-coated br onze on the 4527 packaging model reel tape width diameter pieces/reel packaging code lead (pb)-free lead (pb)-bearing PSF2012 12 mm/embossed plas tic 330 mm/13" 2000 ea ta PSF4527 24 mm/embossed plas tic 330 mm/13" 1200 ea ta
PSF www.vishay.com vishay dale revision: 13-jul-12 3 document number: 30162 for technical questions, contact: ff2aresistors@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 temperature coefficient of resistance temperature coefficient (tc) of resistance is normally stated as the maximum amount of resistance change from the original + 25 c value as the ambient temperature increases or decreases. this is most commonly expressed in parts per million per degree centigrade ( ppm/c). the resistance curve over the operating temperature range is usually a non-linear curve within predictable maximum limits. PSF resistors have a very uniform resistance temperature characteristic when measured over the operating range of - 20 c to + 85 c. the sta ndard temperature coefficients available are e = 25 ppm/c, x = 15 ppm/c, y = 10 ppm/c, and z = 5 ppm/c. some applications of the PSF require operation beyond the specifications of - 20 c to + 85 c. the change in temperature coeff icient of resistance is very small (less than 0.05 ppm/c) over the expa nded temperature range of - 55 c to + 150 c. therefore, when operating outside the range of - 20 c to + 85 c, the designer can plan for a worst case addition of 0.05 ppm/c for each degree centi grade beyond either - 20 c or + 85 c as indicated in the graph. this applies to all four temperature coefficient codes. example: ? assume the operating characteristics de mand a temperature range fr om - 55 c to + 125 c. this requires a 35 c ? below - 20 c and a 40 c ? above + 85 c. the extreme ? being 40 c means that the worst case additi on to the specified tc limit of 0.05 ppm/c times 40 c or 2 ppm/c. therefore, a z which is characterized by a base tc limit of 5 ppm/c over the temperature range of - 20 c to + 85 c will exhibit a maximum temperature coefficient of 7 ppm/c over the expanded portion of the temperature ra nge of - 55 c to 125 c. performance test conditions of test test results (typical test lots) life mil-std-202, method 108, 1000 h rated power at + 85 c ? 0.04 % short time overload mil-pr f-55342, paragraph 4.8.6 ? 0.01 % thermal shock mil-std-202, method 107, - 65 c to + 150 c ? 0.02 % low temperature operation mil -prf-55342, paragraph 4.8.5 ? 0.02 % resistance to bonding expo sure mil-std-202, method 210 ? 0.02 % moisture resistance mil-pr f-55342, paragraph 4.8.9 ? 0.08 % solder mounting integrity mil-prf-55342, paragraph 4.8.13, 3 kg for 30 s no evidence of mechanical damage dielectric withstanding voltage m il-std-202, methods 301 and 105 ? 0.01 % solderability mil-std-202, method 208 95 % coverage - 50 - 30 - 40 - 20 90 150 140 130 120 110 100 e, x, y, or z expanded operating range + 85 c to + 150 c expanded operating range - 55 c to - 20 c - 20 c to + 85 c base tc limit ppm/c addition to base tc in the expanded portion of the temperature range 4 3 2 1 0
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