fast recover rectifier voltage range 50 to 1000 volts FR251 thru fr257 current 2 .5ampere e-mail: sales@cnmic.com web site: www.cnmic.com features low coat construction fast switching for high efficency. low reverse leakage high forward surge current capability high temperature soldering guaranteed: 260 /10 secods/.375 (9.5mm)lead length at 5 lbs(2.3kg) tension mechanical data case: transfer molded plastic epoxy: ul94v-o rate flame retardant polarity: color band denotes cathode end lead: plated axial lead, solderable per mil-std-202e method 208c mounting position: any weight: 0.042ounce, 1.19 grams maximum ratings and electrical characteristics ratings at 25 o c ambient temperature unless otherwise specified single phase, half wave, 60hz, resistive or inductive load for capacitive load derate current by 20% symbols fr 251 fr 252 fr 253 fr 254 fr 255 fr 256 fr 257 units maximum repetitive peak reverse voltage v rrm 50 100 200 400 600 800 1000 volts maximum rms voltage v rms 35 70 140 280 420 560 700 volts maximum dc blocking voltage v dc 50 100 200 400 600 800 1000 volts maximum average forward rectified current 0.375 (9.5mm) lead length at t a = 75 i (av) 2.5 amp peak forward surge current 8.3ms single half sine wave superimposed on rated load (jedec method) i fsm 100 amps maximum instantaneous forward voltage @ 2.5a v f 1.3 volts t a = 25 5.0 maximum dc reverse current at rated dc blocking voltage t a = 100 i r 500 a maximum reverse recovery time (note 3) t j =25 trr 150 250 500 ns typical junction capacitance (note 1) c j 60 pf typical thermal resistance (note 2) r ja 30 /w operating junction temperature range t j (-55 to +150) storage temperature range t stg (-55 to +150) notes: 1.measured at 1.0mhz and applied reverse voltage of 4.0volits. 2 thermal resistance from junction to ambient at .375 (9.5mm)lead length, p.c.board mounted. 3.reverse recovery test conditions:if=0.5ma,ir=1.0ma,irr=0.25a r-3 dia. .042(1.1) .038(0.96) dia. .160(4.1) .138(3.5) .160(4.1) .138(3.5) 1.0(25.4) min. 1.0(25.4) min. dimensions in inches and (millimeters)
fast recover rectifier voltage range 50 to 1000 volts FR251 thru fr257 current 2 .5ampere e-mail: sales@cnmic.com web site: www.cnmic.com 3.0 characteristics fig.4-typical reverse derating curve fig.1-typical forward current 150 175 125 75 100 2.0 50 1.0 0 0 single phase inductive load half wave 60hz resistive or 25 a v e r a g e f o r w a r d c u r r e n t , ( a ) ambient temperature, ( c) 100 100 10 fig.5-typical junction capacitance 10 1.0 0.1 1 reverse voltage,(v) tj=25 c f=1mhz 0.375"(9.5mm)lead length vsig=50mvp-p rating and chracteristic curves FR251 thru fr257 0.01 j t =25 c 120 140 i n s t a n t a n e o u s r e v e r s e c u r r e n t , percent of rated peak reverse voltage,(%) ( u a ) 0 20 0.1 1.0 100 60 40 80 10 t =100 c j fig.6-test circuit diagram and reverse rexovery time characteristic note: 1.rise time =7ns max.input impedance=1megohm.22pf 2.rise time=10ns max.source impedance=50 ohms set time base for 50 /100ns /cm -1.0a 0.25a 0 +0.5a oscilloscope (note 1) pulse generatior (note 2) (-) 1 non inductive 10 noninductive 50 noninductive d . u.t (-) approx 25 vdc (+) 20 1.8 1.6 1.4 i n s t a n t a n e o u s f o r w a r d c u r r e n t , instantaneous forward voltage,(v) ( a ) ( a ) 0.01 0.1 1.0 pulse width=300us 1% duty cycle 0.40.6 0.81.0 tj =25 c 1.2 forward characteristics fig.3-typical instantaneous 10 80 4 6 40 forward surge current number of cycles at 60 hz p e a k f o r w a r d s u r g e c u r r e n t , ( a ) 10 1 20 60 100 28 102060 100 fig.2-maximum non-repetitive peak 200 80 40 8.3ms single half sine-wave (jedec method) tj=tjmax 60 80 40 20 8 6 4 2 j u n c t i o n c a p a c i t a n c e , ( p f )
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