BY251 thru by255 medium current plastic rectifier voltage - 200 to 1300 volts current - 3.0 amperes features l high surge current capability l plastic package has underwriters laboratory flammability classification 94v - o l low leakage l void - free mo lded in do - 201ad plastic package l high current operation of 3 amperes at t a =95 with no thermal runaway l exceeds environmental standards of mil - s - 19500/228 mechanical data case: jedec do - 201ad molded plastic terminals: plated axial leads, solderable per mil - std - 750, method 2026 polarity: color band denotes cathode mounting posi tion: any weight: 0.04 ounce, 1.1 gram maximum ratings and electrical characteristics ratings at 25 ambient temperature unless otherwise specified. 60 hz, resistive or inductive load. for capacitive load, derate current by 20%. symbols BY251 by252 by253 by254 by255 units maximum recurrent peak reverse voltage v rrm 200 400 600 800 1300 volts maximum rms voltage v rms 140 280 420 560 910 volts maximum dc blocking voltage v dc 200 400 600 800 1300 volts maximum average forward rectified current .375"(9.5 mm) lead length at t a =95 i (av) 3.0 amps peak forward surge current 8.3ms single half sine - wave superimposed on rated load (jedec method) i fsm 100.0 amps maximum instantaneous forward voltage t j =25 at 3.0a t j =100 v f 1.1 1.0 volts volts maximum d c reverse current t a =25 at rated dc blocking voltage t a =100 i r 5.0 1000 a a typical junction capacitance (note 2) t j =25 c j 40 p f typical reverse recovery time (note 3) t rr 2.5 a typical thermal resistance (note 1) r ja 15.0 /w operating junctio n temperature range t j - 50 to +150 storage temperature range t stg - 50 to +150 do - 201ad
notes: 1. thermal resistance from junction to applied at ambient 0.375"(9.5mm) lead length p.c.board mounted. 2. measured at 1 mhz and applied reverse voltage of 4.0 volts. 3. rev erse recovery test conditions: i f =0.5a, i r =1.0a, irr=0.25a. rating and characteristic curves BY251 thru by255 fig. 1 - forward current derating curve fig. 2 - maximum peak forward surge current fig. 3 - typical instantaneous forward fig. 4 - typical junction characteristics characteristics fig. 5 - typical reverse characteristics
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