BY251 THRU BY255 3.0 AMPS. Silicon Rectifiers Voltage Range 200 to 1300 Volts Current 3.0Amperes DO-201AD Features a Low forward voltage drop a High current capability a High reliability a High surge current capability Mechanical Data a Cases: Molded plastic a Epoxy: UL 94V-O rate flame retardant a Lead: Axial leads, solderable per MILLead: STD-202, Method 208 guaranteed a Polarity: Color band denotes cathode end a High temperature soldering guaranteed: 250°C/10 seconds/.375”,(9.5mm) lead lengths at 5 lbs., (2.3kg) tension aWeight: 1.2 grams Dimensions in inches and (millimeters) 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% Type Number Maximum Recurrent Peak Reverse Voltage Maximum RMS Voltage Maximum DC Blocking Voltage BY251 200 140 200 BY252 400 280 400 Maximum Average Forward Rectified Current . 375 (9.5mm) Lead Length @TA = 75°C Peak Forward Surge Current, 8.3 ms Single Half Sine-wave Superimposed on Rated Load (JEDEC method ) Maximum Instantaneous Forward Voltage @ 3.0A Maximum DC Reverse Current @ TA=25°C at Rated DC Blocking Voltage @ TA=100°C Maximum Full Load Reverse Current, Full Cycle Average .375”(9.5mm) Lead Length @TL=75°C Typical Junction Capacitance ( Note 1 ) Typical Thermal Resistance RÛJA ( Note 2 ) Operating Temperature Range TJ Storage Temperature Range TSTG BY253 600 420 600 BY254 800 560 800 Units V V V 3.0 A 150 A 1.0 V 5.0 100 30 uA uA uA 50 18 -65 to +150 -65 to +150 pF °C/W °C °C Notes: 1. Measured at 1 MHz and Applied Reverse Voltage of 4.0 V D.C. Notes: 2. Thermal Resistance from Junction to Ambient .375” (9.5mm) Lead Length. - 298 - BY255 1300 910 1300 4 FIG.1- MAXIMUM FORWARD CURRENT DERATING CURVE FIG.2- MAXIMUM FORWARD SURGE CURRENT 150 3 2 Single Phase Half Wave 60Hz Resistive or Inductive Load 0.375" (9.5mm) Lead Length 1 0 0 25 50 75 100 125 150 175 PEAK FORWARD SURGE CURRENT. (A) AVERAGE FORWARD CURRENT AMPERES RATINGS AND CHARACTERISTIC CURVES (BY251 THRU BY255) NON-REPETITIVE 100 50 Tj=25oC 10 1 50 100 NUMBER OF CYCLES AT 60Hz FIG.4- TYPICAL JUNCTION CAPACITANCE FIG.3- TYPICAL FORWARD CHARACTERISTICS 100 JUNCTION CAPACITANCE.(pF) 100 30 10 3.0 Tj=25oC Pulse Width=300 s 1% Duty Cycle 1.0 50 Tj=25 0C 10 5 1 .1 1 5 10 REVERSE VOLTAGE. (V) 50 100 FIG.5- TYPICAL REVERSE CHARACTERISTICS .03 .6 .8 1.0 1.2 1.4 FORWARD VOLTAGE. (V) 1.6 1.8 INSTANTANEOUS REVERSE CURRENT. ( A) INSTANTANEOUS FORWARD CURRENT. (A) 10 5 o AMBIENT TEMPERATURE. ( C) .01 .4 REPETITIVE 8.3ms Single Half Sine Wave JEDEC Method - 299- 100 Tj=100 0C 1.0 .1 Tj=25 0C .01 0 20 40 60 80 100 120 PERCENT OF RATED PEAK REVERSE VOLTAGE. (%) 140