BY251 - BY255 SILICON RECTIFIER DIODES DO - 201AD PRV : 200 - 1300 Volts Io : 3.0 Amperes * * * * * * 1.00 (25.4) MIN. 0.21 (5.33) 0.19 (4.83) FEATURES : High current capability High surge current capability High reliability Low reverse current Low forward voltage drop Pb / RoHS Free 0.375 (9.53) 0.285 (7.24) 1.00 (25.4) MIN. 0.052 (1.32) 0.048 (1.22) MECHANICAL DATA : * Case : DO-201AD 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 : 0.929 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%. RATING SYMBOL BY251 BY252 BY253 BY254 BY255 UNIT Maximum Repetitive Peak Reverse Voltage VRRM 200 400 600 800 1300 V Maximum RMS Voltage VRMS 140 280 420 560 910 V Maximum DC Blocking Voltage VDC 200 400 600 800 1300 V Maximum Average Forward Current IF 3.0 A IFSM 100 A VF 1.1 V IR 20 µA IR(H) 50 µA CJ 50 pF RθJA 18 °C/W Junction Temperature Range TJ - 65 to + 175 °C Storage Temperature Range TSTG - 65 to + 175 °C 0.375"(9.5mm) Lead Length Ta = 50 °C Peak Forward Surge Current 8.3ms Single half sine wave Superimposed on rated load (JEDEC Method) Maximum Forward Voltage at IF = 3.0 Amps. Ta = 25 °C Maximum DC Reverse Current at rated DC Blocking Voltage Ta = 100 °C Typical Junction Capacitance (Note1) Typical Thermal Resistance (Note2) Notes : (1) Measured at 1.0 MHz and applied reverse voltage of 4.0V DC (2) Thermal resistance from Junction to Ambient at 0.375" (9.5mm) Lead Lengths, P.C. Board Mounted. Page 1 of 2 Rev. 02 : March 25, 2005 RATING AND CHARACTERISTIC CURVES ( BY251 - BY255 ) FIG.1 - DERATING CURVE FOR OUTPUT RECTIFIED CURRENT FIG.2 - MAXIMUM NON-REPETITIVE PEAK FORWARD SURGE CURRENT 100 PEAK FORWARD SURGE CURRENT, AMPERES AVERAGE FORWARD OUTPUT CURRENT, AMPERES 3.0 2.4 1.8 1.2 0.6 Ta = 25 °C 80 60 40 20 NON-REPETITIVE 0 0 25 50 75 100 125 150 0 175 1 2 AMBIENT TEMPERATURE, ( ° C) 100 10 Pulse W idth = 300 µs 2% Duty Cycle T J = 25 °C 10 20 40 60 100 100 T J = 25 °C 50 10 5 1 1 2 4 10 20 40 100 REVERSE VOLTAGE, VOLTS 0.1 0.01 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 FORWARD VOLTAGE, VOLTS 2.0 REVERSE CURRENT, MICROAMPERES FORWARD CURRENT, AMPERES 6 FIG 4 . - TYPICAL JUNCTION CAPACITANCE JUNCTION CAPACITANCE, (pF) FIG.3 - TYPICAL FORWARD CHARACTERISTICS 1.0 4 NUMBER OF CYCLES AT 60Hz FIG. 5 - TYPICAL REVERSE CHARACTERISTICS 10 Ta = 100 °C 1.0 0.1 Ta = 25 °C 0.01 0 20 40 60 80 100 120 140 PERCENT OF RATED REVERSE VOLTAGE, (%) Page 2 of 2 Rev. 02 : March 25, 2005