leshan radio company, ltd. 14a?1/2 1a 1a fast recovery diodes 1n4933e 1n4934e 1n4935e 1n4936e 1n4937e type maximum peak reverse voltage maximum average rectified current @ half-wave resistive load 60hz maximum forward peak surge current @ 8.3ms superimposed maximum reverse current @ prv @ t a =25oc maximum forward voltage @ t a =25oc package dimensions maximum reverse recovery time 1.0 trr i f = 0.5a , i r = 1.0a , i rr = 0.25a trr test conditions: i f = 0.5a , i r = 1.0a , i rr = 0.25a 50 100 200 400 600 prv v pk i o @ t l a av oc i fm (surge) a pk i r adc i fm v fm a pk v pk trr ns 1n4933e ? 1n4937e 75 30 5.0 1.0 1.2 200 a ? 405 1.0(25.4) min .205(5.2) .166(4.2) .025(0.6) dia .021(0.5) 1.0(25.4) min .107(2.7) dia .080(2.0) a ? 405
leshan radio company, ltd. 14a?2/2 1n4933 ? 1n4937 rating & characteristic curves of fast recovery diodes set time base for 50/100ns/cm fig.1 - test circuit diagram and reverse recovery time characteristic trr ifm 1.0 0 irm(rec) i(t) di/dt=50a/ s a tektronix 545a.k plug in pre amp p6000 probe or equivalent r 1 adjusted for 1.4 ? ? between point 2 of relay and rectifier inductive =38 h 1cm 1.0adc from constant voltage supply ripple=3mvrms max 115va 10k 60hz 2w 1 7 6 8 5 3 2 c.p.clare hpg1002 30 ? ?50w non inductive 30vdc constant voltage supply 38 h/1.4 ? ? 1 amp slo blo fuse c 1 i.0 f 300v unit under test r 2 1 ? ? 10w non insuctive zout 1.5 ? ? max dc to 2khz r 2 ten 1w 10 ? ?% carbon core in parallel +10 t a 25 o oc for rectifier minimize all leas lengths 4 0 50 100 150 175 1.0 .8 .6 .4 .2 0 single phase half wave 60hz resistive or inductive load fig. 2 ? typical forward current derating curve ambient temper ature, (oc) average forward current,(a) instantaneous forward current,(a) instantaneous forward voltage,(v) .6 .8 1.0 1.2 1.4 20 10 1.0 0.1 .01 pulse width=300 s 1% duty cycle fig. 3 - typical instantaneous forward characteristics t j =25oc peak forward surge current,(a) junction capacitance,(pf) number of cycles at 60hz 8.3ms single half sine-wave (jedec method) 1 2 4 6 8 10 20 40 60 80 100 50 40 30 20 10 0 reverse voltage,(v) .1 .2 .4 1.0 2 4 10 20 40 100 200 100 60 40 20 10 6 4 2 1 t j =25oc fig. 4 - maxinum non-repetitive foward surge current fig. 5 - typical junction capacitance
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