www.vishay.com for technical questions , contact: ff2aresis tors@vishay.com document number: 31019 86 revision: 05-may-08 ptf vishay dale metal film resistors, precision, ultra-high stability features ? extremely low temperature coefficient of resistance ? very low noise and voltage coefficient ? very good high frequency characteristics ? can replace wirewound bobbins ? proprietary epoxy coating provides superior moisture protection ? lead (pb)-free version is rohs compliant note: ? marking: print-marked-model, value, tolerance, tc, date code note: (1) historical tolerance codes were bb for 0.01 % and bc for 0.02 % * pb containing terminations are not rohs compliant, exemptions may apply a v aila b le p b -free rohs* compliant e3 standard electrical specifications global model historical model power rating p 85 c w limiting element voltage max. v ? temperature coefficient ppm/c tolerance % resistance range ptf51 ptf-51 0.05 200 5, 10, 15 0.02, 0.05, 0.1, 0.25, 0.5, 1 15r to 100k ptf56 ptf-56 0.125 300 5, 10, 15 0.01, 0.02, 0.05, 0.1, 0.25, 0.5, 1 15r to 500k ptf65 ptf-65 0.25 500 5, 10, 15 0.05, 0.1, 0.25, 0.5, 1 15r to 1m0 temperature coefficient codes global tc code historical tc code temperature coefficient z t- 1 6 5 ppm/c y t- 1 3 10 ppm/c x t-10 15 ppm/c technical specifications parameter unit ptf51 ptf56 ptf65 rated dissipation at 85 c w 0.05 0.125 0.25 limiting element voltage v ? 200 300 500 insulation voltage (1 min) v eff > 500 > 500 > 500 thermal resistance k/w < 1300 < 520 260 terminal strength, axial n > 150 > 50 > 50 insulation resistance ? 10 11 10 11 10 11 category temperature range c - 55 to + 150 - 55 to + 150 - 55 to + 150 failure rate 10 -9 /h< 1< 1< 1 weight (max.) g 0.11 0.35 0.75 global part number information resista n ce tolera n ce model v alue code ptf51 r = decimal k = tho u sand m = million 15r000 = 15 500k00 = 500 k 1m0000 = 1.0 m t = 0.01 % (1) z = 5 ppm ek = lead (p b )-free, b u lk ea = lead (p b )-free, t/r (f u ll) eb = lead (p b )-free, t/r (1000 pieces) bf = tin/lead, b u lk re = tin/lead, t/r (f u ll) r6 = tin/lead, t/r (1000 pieces) q = 0.02 % (1) y = 10 ppm ptf65 a = 0.05 % x = 15 ppm b = 0.1 % 0 = special c = 0.25 % d = 0.5 % f = 1 % new global part numberin g : ptf5620k500byre (preferred part numberin g format) pt f 56 2 0 k5 0 0 b y historical part number example: ptf-5620k5bt-13r36 (will continue to be accepted) ptf-56 20k5 b t-13 r36 historical resista n ce tolera n ce temp. model v alue code coefficie n t blank = standard (dash nu m b er) ( u p to 3 digits) from 1 - 99 9 packagi n g as applica b le ptf56 r e temp. coefficie n t special global packagi n g
document number: 31019 for technical questi ons, contact: ff2ares istors@vishay.com www.vishay.com revision: 05-may-08 87 ptf metal film resistors, prec ision, ultra-high stability vishay dale dimensions note: (1) 1.0 8 0.125 [27.43 3.1 8 ] if tape and reel l 1 max. l d 1.50 0.125 (1) [3 8 .10 3.1 8 ] d global model dimensions in inches [millimeters] ldl 1 max. d ptf51 0.150 0.020 [3.81 0.51] 0.070 0.010 [1.78 0.25] 0.200 [5.08] 0.016 [0.41] ptf56 0.250 0.031 [6.35 0.79] 0.091 0.009 [2.31 0.23] 0.300 [7.62] 0.025 [0.64] ptf65 0.375 0.062 [9.53 1.57] 0.145 0.016 [3.68 0.41] 0.475 [12.07] 0.025 [0.64] performance test conditions of test test results life mil-prf-55182 paragraph 4.8.18 1000 h rated power at + 85 c 0.04 % thermal shock mil-std-202, method 107 - 55 c to + 85 c 0.02 % short time overload mil-r-10509, paragraph 4.7.6 0.01 % low temperature operation mil-prf-55182, methods 4.8.10 0.02 % moisture mil-prf-55182, paragraph 4.8.15 0.08 % resistance to soldering heat mil-std-202, methods 210 0.02 % damp heat iec 60068-2-3 56 days at 40 c and 92 % rh 0.08 % dielectric withstanding voltage mil-std-202, methods 301 and 105 0.01 % material specifications element: precision deposited nickel chrome alloy with controlled annealing encapsulation: specially formulated epoxy compounds. coated construction core: fire-cleanded high purity ceramic termination: standard lead material is solder-coated copper. solderable and weldable per mil-std-1276, type c. ambient temperature in c derating rated power in % 0 20 40 60 8 0 100 120 - 55 - 25 0 25 50 75 100 125 150 175 200 8 5 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 of 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 with in predictable maximum limits. ptf resistors have a very unifom resistance temp. characteristic when measured over the operating range of - 20 c to + 85 c. the standard temperature coefficients available are x = 15 ppm/c, y = 10 ppm/c and z = 5 ppm/c. some applications of the ptf require operation beyond the specifications of - 20 c to + 85 c. the change in temperature coeffecient of resistance is ve ry small (less than 0.05 ppm/c) over the expanded temperature range of - 55 c to 150 c. therefore, when operating outside the range - 20 c to + 85 c, the designer can plan for a worst case addition of 0.05 ppm/c for each degree centigrade beyond either - 20 c or + 85 c as indicated in the graph. this applies to all three temperature coefficient codes. example: assume the operating characteristics demand a temperature range 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 - 20 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. 4 3 2 1 0 - 50 - 40 - 30 - 20 90 100 110 120 130 140 150 expa n ded operati n g ra n ge - 55 c to - 20 c expa n ded operati n g ra n ge - 8 5 c to + 150 c - 20 c to + 8 5 c base tc limit x, y or z / m p p?c e h t n i c t e s a b o t n o i t i d d a e h t f o n o i t r o p d e d n a p x e e g n a r e r u t a r e p m e t
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