fr251 - FR257-STR fast recovery rectifier diodes prv : 50 - 1000 volts io : 2.5 amperes features : * high current capability * high surge current capability * high reliability * low reverse current * low forward voltage drop * fast switching for high efficiency mechanical data : * case : d2a molded plastic * epoxy : ul94v-o rate flame retardant * lead : axial lead solderable per mil-std-202, method 208 guaranteed * polarity : color band denotes cathode end * mounting position : any * weight : 0.645 gram maximum ratings and electrical characteristics rating at 25 c ambient temperature unless otherwise specified. single phase, half wave, 60 hz, resistive or inductive load. for capacitive load, derate current by 20%. symbol fr251 fr252 fr253 fr254 fr255 fr256 fr257 fr257 -str unit maximum recurrent peak reverse voltage v rrm 50 100 200 400 600 800 1000 1000 v maximum rms voltage v rms 35 70 140 280 420 560 700 700 v maximum dc blocking voltage v dc 50 100 200 400 600 800 1000 1000 v maximum average forward current 0.375"(9.5mm) lead length ta = 55 c peak forward surge current, 8.3ms single half sine wave superimposed on rated load (jedec method) maximum peak forward voltage at i f = 2.5 a v f 1.3 v maximum dc reverse current ta = 25 c i r 10 m a at rated dc blocking voltage ta = 100 c i r(h) 500 m a maximum reverse recovery time ( note 1 ) trr 150 250 500 250 ns typical junction capacitance ( note 2 ) c j 28 pf junction temperature range t j - 65 to + 150 c storage temperature range t stg - 65 to + 150 c notes : ( 1 ) reverse recovery test conditions : i f = 0.5 a, i r = 1.0 a, irr = 0.25 a. ( 2 ) measured at 1.0 mhz and applied reverse voltage of 4.0 v dc page 1 of 2 rev. 01 : january 10, 2004 a a 2.5 rating i f(av) i fsm 100 d2a 0.040 (1.02) 0.0385 (0.98) 1.00 (25.4) min. 0.161 (4.1) 0.154 (3.9) 0.284 (7.2) 0.268 (6.8) 1.00 (25.4) min. dimensions in inches and ( millimeters )
rating and characteristic curves ( fr251 - fr257 ) fig.1 - reverse recovery time characteristic and test circuit diagram + notes : 1. rise time = 7 ns max., input impedance = 1 megaohm, 22 pf. 2. rise time = 10 ns max., source impedance = 50 ohms. 3. all resistors = non-inductive types. fig.2 - derating curve for output fig.3 - maximum non-repetitive peak rectified current forward surge current 0 25 50 75 100 125 150 175 1 2 4 6 10 20 40 60 100 ambient temperature, ( c) number of cycles at 60hz fig.4 - typical forward characteristics fig.5 - typical reverse characteristics 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 forward voltage, volts page 2 of 2 rev. 01 : january 10, 2004 60hz resistive or inductive load 2.0 1.5 1.0 0.5 2.5 100 10 1.0 80 0 100 0 60 40 20 0.1 10 80 0.01 0.01 1.0 0.1 100 140 0 20 40 60 120 percent of rated reverse voltage, (%) peak forward surge current, amperes average forward output current, amperes forward current, amperes reverse current, microamperes t j = 25 c t j = 100 c t j = 25 c pulse width = 300 m s 2% duty cycle 8.3 ms single half sine wave ta = 50 c set time base for 50/100 ns/cm trr + 0.5 a 0 - 0.25 a - 1.0 a 1 cm 50 vdc (approx) oscilloscope ( note 1 ) 1 w 50 w 10 w d.u.t. pulse generator ( note 2 )
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