www.vishay.com for technical questions, contact: ff2aresistors@vishay.com document number: 30162 320 revision: 14-apr-10 psf vishay dale metal film resistors, high precision, high stability, surface mount features ? extremely low temper ature 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 dale?s ptf datasheet ? compliant to rohs directive 2002/95/ec notes ? marking: print-marked-model, val ue, tolerance, tc, date code. ? dscc has created a drawing to support the need for a precision 2012-sized pr oduct. vishay dale is li sted as a resource on this drawing as follows: this drawing can be reviewed at: www.dscc.dla.mil/programs/milspec/listdwgs.asp?doctype=dsccdwg . (1) continuous working voltage shall be or ma ximum working voltage, whichever is less. * pb containing terminations are not rohs compliant, exemptions may apply 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 element 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: psf201220k50byta (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
document number: 30162 for technical questions, contact: ff2aresistors @vishay.com www.vishay.com revision: 14-apr-10 321 psf metal film resistor s, high precision, high stability, surface mount vishay dale thermal resistance derating note ? embossed carrier 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) w l t h w 1 l a b 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) 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 8 0 40 0 - 55 0 25 200 ambient temperature in c rated power in % 60 20 - 25 175 150 125 100 75 50 8 5 material specifications element precision deposited nickel 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 c opper on the 2012 and solder-coated bronze on the 4527 packaging model reel tape width diameter pieces/reel packaging code lead (pb)-free lead (pb)-bearing psf2012 12 mm/embossed plastic 330 mm/13" 2000 ea ta psf4527 24 mm/embossed plastic 330 mm/13" 1200 ea ta
www.vishay.com for technical questions, contact: ff2aresistors@vishay.com document number: 30162 322 revision: 14-apr-10 psf vishay dale metal film resistor s, high precision, high stability, surface mount temperature coefficient of resistance temperature coefficient (tc) of resistanc e is normally stated as the maximum amount of resistance change from the original + 25 c value as the ambient temperature increases or de creases. this is most commonly expressed in parts per million per degree centigrade ( ppm/c). the resistance curve over the operating temperature range is usua lly a non-linear curve within pr edictable 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 operati on 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 expanded 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 demand a temperature r ange from - 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 addition 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 - 2 0 c to + 85 c will exhibit a maximum temperature coefficient of 7 ppm/c over the expanded portion of the temperature range of - 55 c to 125 c. - 50 - 30 - 40 - 20 90 150 140 130 120 110 100 e, x, y, or z expanded operating range + 8 5 c to + 150 c expanded operating range - 55 c to - 20 c - 20 c to + 8 5 c base tc limit ppm/c addition to base tc in the expanded portion of the temperature range 4 3 2 1 0 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-prf-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 exposure mil-std-202, method 210 0.02 % moisture resistance mil-prf-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 mil-std-202, methods 301 and 105 0.01 % solderability mil-std-202, method 208 95 % coverage
document number: 91000 www.vishay.com revision: 18-jul-08 1 disclaimer legal disclaimer notice vishay all product specifications and data are subject to change without notice. vishay intertechnology, inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, ?vishay?), disclaim any and all liability fo r any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. vishay disclaims any and all li ability arising out of the use or application of any product describ ed herein or of any information provided herein to the maximum extent permit ted by law. the product specifications do not expand or otherwise modify vishay?s terms and conditions of purcha se, including but not limited to the warranty expressed therein, which apply to these products. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of vishay. the products shown herein are not designed for use in medi cal, life-saving, or life-sustaining applications unless otherwise expressly indicated. customers using or selling vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify vishay for any damages arising or resulting from such use or sale. please contact authorized vishay personnel to obtain written terms and conditions regarding products designed for such applications. product names and markings noted herein may be trademarks of their respective owners.
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