features low cost diffused junction low leakage low forward voltage drop high current capability and similar solvents mechanical data case:jedec r--3,molded plastic terminals: axial lead ,solderable per mil- std-202,method 208 polarity: color band denotes cathode weight:0.021 unces,0.58 grams mounting pos ition: any maximum ratings and electrical characteristics ratings at 25 ambient temperature unless otherwise specified. single phase,half wave,60 hz,resistive or inductive load. for capacitive load,derate by 20%. fr 253 fr 254 fr 255 fr 256 fr 257 units maximum recurrent peak reverse voltage v rrm 200 400 600 800 1000 v max imum rms v oltage v rms 140 280 420 560 700 v maximum dc blocking voltage v dc 200 400 600 800 1000 v maximum average forw ard rectified current 9.5mm lead length, @t a =75 peak forw ard surge current 8.3ms single half-sine-w ave superimposed on rated load @t j =125 maximum instantaneous forw ard voltage @ 2.5 a v f v maximum reverse current @t a =25 at rated dc blocking voltage @t a =100 maximum reverse recovery time (note1) t rr 250 ns typical junction capacitance (note2) c j pf typical thermal resistance (note3) r ja <d operating junction temperature range t j storage temperature range t stg note:1. measured with i f =0.5a, i r =1a, i rr =0.25a. 500 voltage range: 50 --- 1000 v current: 2.5 a 100 fr 252 2.5 a fast recovery rectifier i f(av) the plastic material carries u/l recognition 94v-0 i r 150.0 5.0 100.0 1.3 70 a i fsm 3. thermal resistance f rom junction to ambient. a 2. measured at 1.0mhz and applied rev erse v oltage of 4.0v dc. - 55---- +150 - 55---- + 150 35 150 22 FR251---fr257 galaxy electrical r - 3 50 35 50 fr 251 easily cleaned with freon,alcohol,isopropanol 100 www.galaxycn.com bl bl galaxy electrical document number 0261005 1.
-1.0a -0.25a 0 +0.5a t rr 1cm pulse generator (note2) d.u.t. 1 n.1. 50 n.1. oscilloscope (note 1) (+) 50vdc (approx) (-) 10 n.1. (-) (+) 0.6 t j =25 pulse width=300 100 40 60 tj=125 8.3ms single half sine-wave 10 86 0.5 1.0 1.5 2.0 2.5 25 50 125 175 single phase half wave 60h z resistive or inductive load 0 75 150 100 0 bl galaxy electrical www.galaxycn.com document number 0261005 2. peak forward surge current amperes amperes ratings and characteristic curves instantaneous forward voltage,volts ambient temperature , fi g. 3--typi cal juncti on capaci tance instantaneous forward current FR251---fr257 junction capacitance,pf amperes notes: 1. rise time =7ns ma x. input impeda nce=1m .22pf fi g. 1 -- typi cal forward derati ng curve fig.2-- forward surge cu r rent fi g. 4 --typi cal forward characteri sti c reverse voltage,volts average forward current 2.rise time=10ns max. source impedance=5o set time base for 50/100 ns /cm fi g. 5 -- reverse recovery ti me characteri sti c and test ci rcui t di agram number of cycles at 60 hz
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