i f(av) rectangular 440 a waveform v rrm range 35 to 45 v i fsm @ tp = 5 s sine 35,000 a v f @ 220apk, t j =125c 0.51 v (per leg) t j range - 55 to 125 c characteristics 444cnq... units major ratings and characteristics the 444cnq center tap schottky rectifier module series has been optimized for low reverse leakage at high temperature. the proprietary barrier technology allows for reliable opera- tion up to 125 c junction temperature. typical applications are in high current switching power supplies, plating power supplies, ups systems, converters, free-wheeling diodes, welding, and reverse battery protection. 125 c t j operation center tap module high purity, high temperature epoxy encapsulation for enhanced mechanical strength and moisture resistance low forward voltage drop high frequency operation guard ring for enhanced ruggedness and long term reliability description/features to-244ab schottky rectifier 440 amp 444cnq... series bulletin pd-2.243 rev. b 07/00 base anode 2 63.50 [2.500] 60.96 [2.400] 23.55 [.927] 20.42 [.804] 14.99 [.590] 15.75 [.620] 20.32 [.800] 17.78 [.700] 39.75 [1.565] 40.26 [1.585] 80.01 [3.150] 34.925 [1.375] 3.35 [.132] 3.02 [.119] 90.17 [3.550] 92.71 [3.650] 7.49 [.295] 6.99 [.275] 2x ? 10.41 [.410] 9.65 [.380] ? 4.70 [.185] 4.95 [.195] 1/4-20 slotted hex common cathode ref. terminal lug common cathode anode 1 terminal lug ? notes: 1. dimensions are shown in millimeters [inches]. 2. controlling dimension: millimeter modified jedec outline to-244ab dimensions in millimeters and (inches) 1
444cnq... series 2 pd-2.243 rev. a 12/97 www.irf.com part number 444cnq035 444cnq040 444CNQ045 v r max. dc reverse voltage (v) v rwm max. working peak reverse voltage (v) voltage ratings absolute maximum ratings following any rated load condition and with rated v rrm applied parameters 444cnq units conditions a i f(av) max. average forward current 440 a 50% duty cycle @ t c = 81 c, rectangular wave form * see fig. 5 i fsm max. peak one cycle non-repetitive 35,000 5s sine or 3s rect. pulse surge current (per leg) * see fig. 7 3800 10ms sine or 6ms rect. pulse e as non-repetitive avalanche energy 270 mj t j = 25 c, i as = 40 amps, l = 0.34 mh (per leg) i ar repetitive avalanche current 40 a current decaying linearly to zero in 1 sec (per leg) frequency limited by t j max. v a = 1.5 x v r typical t j max. junction temperature range -55 to 125 c t stg max. storage temperature range -55 to 125 c r thjc max. thermal resistance junction 0.20 c/w dc operation * see fig. 4 to case (per leg) r thjc max. thermal resistance junction 0.10 c/w dc operation to case (per package) r thcs typical thermal resistance, case 0.10 c/w mounting surface , smooth and greased to heatsink wt approximate weight 79 (2.80) g (oz.) t mounting torque base min. 40 (35) max. 58 (50) mounting torque center hole typ. 17 (15) terminal torque min. 58 (50) max. 86 (75) case style to - 244ab modified jedec thermal-mechanical specifications parameters 444cnq units conditions t j = 25 c v r = rated v r kg-cm (ibf-in) electrical specifications 35 40 45 v fm max. forward voltage drop 0.53 v @ 220a (per leg) * see fig. 1 (1) 0.69 v @ 440a 0.51 v @ 220a 0.68 v @ 440a i rm max. reverse leakage current 20 ma t j = 25 c (per leg) * see fig. 2 (1) 2400 ma t j = 125 c c t max. junction capacitance (per leg) 10,300 pf v r = 5v dc , (test signal range 100khz to 1mhz) 25c l s typical series inductance (per leg) 5.0 nh from top of terminal hole to mounting plane dv/dt max. voltage rate of change 10,000 v/ s (rated v r ) parameters 444cnq units conditions t j = 100 c (1) pulse width < 300s, duty cycle <2%
444cnq... series 3 pd-2.243 rev. a 12/97 www.irf.com fig. 2 - typical values of reverse current vs. reverse voltage (per leg) fig. 3 - typical junction capacitance vs. reverse voltage (per leg) fig. 4 - max. thermal impedance z thjc characteristics (per leg) fig. 1 - max. forward voltage drop characteristics (per leg) 1 10 100 1000 0.1.2.3.4.5.6.7.8.911.1 t = 125c t = 100c t = 25c j j j .1 1 10 100 1000 10000 0 5 10 15 20 25 30 35 40 4 5 100c 75c 50c 25c t = 125c j 1000 10000 0 1020304050 t = 25c j .001 .01 .1 1 .00001 .0001 .001 .01 .1 1 10 100 d = 0.33 d = 0.50 d = 0.25 d = 0.17 d = 0.08 single pulse (therm al resi stance) 2 t 1 t p d m n otes: 1. d uty factor d = t / t 2. peak t = p x z + t 1 jdmthjc c 2 forward voltage drop - v fm (v) reverse voltage - v r (v) reverse current - i r (ma) junction capacitance - c t (p f) reverse voltage - v r (v) t 1 , rectangular pulse duration (seconds) thermal impedance z thjc (c/w) instantaneous forward current - i f (a)
444cnq... series 4 pd-2.243 rev. a 12/97 www.irf.com fig. 7 - max. non-repetitive surge current (per leg) fig. 5 - max. allowable case temperature vs. average forward current (per leg) fig. 8 - unclamped inductive test circuit fig. 6 - forward power loss characteristics (per leg) 0 25 50 75 100 125 150 175 200 0 50 100 150 200 250 300 350 dc d = 0. 08 d = 0. 17 d = 0. 25 d = 0. 33 d = 0. 50 rm s li m it 80 90 100 110 120 130 0 50 100 150 200 250 300 350 dc 444cn q r (d c) = 0.20c/w thjc 1000 10000 100000 10 100 1000 10000 at any rated load condition and with rated v applied following surge rrm free-wheel d io d e 40hfl40s02 current monitor high-speed sw itch irfp460 l dut rg = 25 ohm vd = 25 volt + average forward current - i f(av) (a) allowable case temperature (c) average forward current - i f(av) (a) average power loss (watts) square wave pulse duration - t p (microsec) non-repetitive surge current - i fsm (a)
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