50 a pressfit rectifier diodes bulletin i20262 05/96 1 8af series www.irf.com major ratings and characteristics parameters 8af units i f(av) 50 a @ t c 150 c i f(rms) 79 a i fsm @ 50hz 714 a @ 60hz 747 a i 2 t @ 50hz 2546 a 2 s @ 60hz 2324 a 2 s i 2 ? t 25455 a 2 ? s v rrm range 50 to 400 v t j - 65 to 195 o c ir case style b-47 features and descriptions convenient pressfit package available with and without leads high surge capabilities fully characterised bulletin
8af series 2 bulletin i20262 05/96 www.irf.com electrical specifications voltage ratings voltage v rrm , maximum repetitive v rsm , maximum non- i rrm max. type number code peak reverse voltage repetitive peak rev. voltage @ t j = t j max vvma 05 50 75 7 1 100 150 7 2 200 300 5 4 400 500 5 8af i f(av) maximum average forward current 50 a 180 conduction, half sine wave @ case temperature 150 c i f(rms) maximum rms forward current 79 a i fsm maximum peak, one-cycle forward, 714 a t = 10ms no voltage non-repetitive surge current 747 t = 8.3ms reapplied 600 t = 10ms 100% v rrm 628 t = 8.3ms reapplied sinusoidal half wave, i 2 t maximum i 2 t for fusing 2546 a 2 s t = 10ms no voltage initial t j = t j max. 2324 t = 8.3ms reapplied 1800 t = 10ms 100% v rrm 1643 t = 8.3ms reapplied i 2 ? t maximum i 2 ? t for fusing 25455 a 2 ? s t = 0.1 to 10ms, no voltage reapplied v f(to)1 low level value of threshold voltage 0.60 v (16.7% x p x i f(av) < i < p x i f(av) ), t j = t j max. v f(to)2 high level value of threshold voltage 0.68 ( p x i f(av) < i < 20 x p x i f(av) ), t j = t j max. r f1 low level value of forward slope resistance 6.66 m w (16.7% x p x i f(av) < i < p x i f(av) ), t j = t j max. r f2 high level value of forward slope resistance 6.25 ( p x i f(av) < i < 20 x p x i f(av) ), t j = t j max. v fm maximum forward voltage drop 1.45 v t j = 25c, i fm = p x rated i f(av) parameter 8af units conditions forward conduction t j max. junction operating temperature range - 65 to 195 c t stg storage temperature range - 65 to 195 r thjc max. thermal resistance, junction to case 0.60 k/w dc operation r thcs typical thermal resistance, case to heatsink 0.50 as per mounting details wt approximate weight 10 (0.36) g (oz) case style b-47 see outline table parameter 8af units conditions thermal and mechanical specifications mounting: a 12.6 0.02mm (0.496 to 0.497 inch) diameter hole should be drilled in heatsink, the leading edge chamfered to 0.03 8mm (0.015 inch) x 45. the autodiode should then be press fitted, ensuring that the sides of the autodiode are kept parallel to the sides of the hole.
8af series 3 bulletin i20262 05/96 www.irf.com 8af 4 n lv 1 23 1 - essential part number 2 - voltage code: code x 100 = v rrm (see voltage ratings table) 3 - n = normal polarity (cathode to case) r = reverse polarity (anode to case) 4 - pp = without lead lh = horizontal lead lv = vertical lead 4 device code ordering information table d r thjc conduction (the following table shows the increment of thermal resistance r thjc when devices operate at different conduction angles than dc) conduction angle sinusoidal conduction rectangular conduction units conditions 180 0.042 0.026 t j = t j max. 120 0.045 0.043 90 0.06 0.06 k/w 60 0.10 0.10 30 0.15 0.15 outline table all dimensions in millimeters (inches) 6 (0.24) 22.5 (0.89) 2.4 (0.09) 16.5 (0.65) 0.5 (0.02) 12.5 (0.49) 5 (0.20) 0.9 (0.03) 15.8 (0.62) r 0.4 (0.02) 7 (0.28) dia. 12.77 / 13.27 (0.50) / (0.52)
8af series 4 bulletin i20262 05/96 www.irf.com fig. 1 - current ratings characteristics fig. 2 - current ratings characteristics fig. 4 - forward power loss characteristics fig. 3 - forward power loss characteristics 140 150 160 170 180 190 200 0 5 10 15 20 25 30 35 40 45 50 55 30 60 90 120 180 maximum allowable case temperature ( c) conduct ion angl e 8af series r (dc) = 0.6 k/w thjc average forward current (a) 140 150 160 170 180 190 200 0 1020304050607080 dc 30 60 90 120 180 maximum allowable case temperat ur e ( c) conduct ion peri od average forward current (a) 8af series r (dc) = 0.6 k/w thjc 0 255075100125150 r = 1 k / w - d e l t a r t h s a 1 . 5 k / w 2 k / w 3 k / w 5 k / w 1 0 k / w 1 5 k / w maximum allowable ambient temperature ( c) 0 10 20 30 40 50 60 70 80 0 102030405060 average forward current (a) rms limit maximum aver age forward power loss (w) conduction angle 180 120 90 60 30 8af series t = 195c j 0 25 50 75 100 125 150 1 5 k / w 1 0 k / w 5 k / w 3 k / w 1 . 5 k / w r = 1 k / w - d e l t a r t h s a 2 k / w maximum allowable ambient temperature ( c) 0 10 20 30 40 50 60 70 80 90 0 1020304050607080 dc 180 120 90 60 30 average forward current (a) rms limit maximum average forward power loss (w) conduct ion period 8af series t = 195c j
8af series 5 bulletin i20262 05/96 www.irf.com fig. 5 - maximum non-repetitive surge current fig. 6 - maximum non-repetitive surge current fig. 7 - forward voltage drop characteristics fig. 8 - thermal impedance z thjc characteristic 0.01 0.1 1 0.001 0.01 0.1 1 10 thjc transi ent thermal impedance z (k/w) 8af seri es square wave pulse duration (s) steady state value (dc operation) 150 200 250 300 350 400 450 500 550 600 650 700 1 10 100 peak half sine wave forward current (a) initial t = 195 c @ 60 hz 0.0083 s @ 50 hz 0.0100 s at any rated load condition and with rated v applied following surge. rrm j number of equal ampl i tude hal f cycle current pulses (n) 8af series 150 200 250 300 350 400 450 500 550 600 650 700 750 0.01 0.1 1 peak half sine wave forward current (a) pulse train duration (s) 8af series maximum non repetitive surge current initial t = 195 c no voltage reapplied rated v reapplied rrm versus pulse train duration. j 1 10 100 1000 01234567 instantaneous forward current (a) 8af series t = 195 c j t = 25c j instantaneous forward voltage (v)
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