BY251 thru BY255 General Purpose Plastic Rectifiers Reverse Voltage 200 to 1300 Volts Forward Current 3.0 Amperes Features Low forward voltage drop High current capability High reliability High surge current capability TJ is 150oC (Max.) and TSTG is 175oC (Max.) with PI glue Mechanical Data Cases: Molded plastic Epoxy: UL 94V-O rate flame retardant Lead: Axial leads, solderable per MIL-STD-202, Method 208 guaranteed Polarity: Color band denotes cathode end High temperature soldering guaranteed: 250oC/10 seconds .375" (9.5mm) lead lengths at 5 lbs., (2.3kg) tension Weight: 0.042 ounce, 1.2 grams Maximum Ratings and Electrical Characteristics Ratings at 25oC ambient temperature unless otherwise specified. Single phase, half wave, 60 Hz, resistive or inductive load. For capacitive load, derate current by 20% Parameter Symbols BY251 BY252 BY253 BY254 BY255 Units Maximum repetitive peak reverse voltage VRRM 200 400 600 800 1300 Volts Maximum RMS voltage VRMS 140 280 420 560 910 Volts Maximum DC blocking voltage V DC 200 400 600 800 1000 Volts Maximum average forward rectified current 0.375" (9.5mm) lead length @TA=50oC I(AV) 3.0 Amp Peak forward surge current, 8.3 ms single half sine-wave superimposed on rated load (JEDEC Method) IFSM 100.0 Amps Maximum instantaneous forward voltage @ 3.0A VF 1.1 Volts IR 5.0 100 uA IR(AV) 30 uA CJ 60 Maximum DC reverse current at rated DC blocking voltage @TA=25oC @TA=100oC Maximum full load reverse current full cycle average, .375" (9.5mm) lead length @TL=75oC Typical junction capacitance (Note 1) Typical thermal resistance (Note 2) Operating junction temperature range Storage temperature range Notes: pF o RθJA 18 TJ -55 to +125 o C -55 to +150 o C TSTG 1. Measured at 1 MHz and Applied Reverse Voltage of 4.0 V D.C. 2. Thermal Resistance from Junction to Ambient .375” (9.5mm) Lead Length 67 C/W RATINGS AND CHARACTERISTIC CURVES (TA = 25oC unless otherwise noted) 68