BY251 DC COMPONENTS CO., LTD. THRU RECTIFIER SPECIALISTS R BY255 TECHNICAL SPECIFICATIONS OF GENERAL PURPOSE SILICON RECTIFIER VOLTAGE RANGE - 50 to 1000 Volts CURRENT - 3.0 Amperes FEATURES * Low cost * Low leakage * Low forward voltage drop DO-27 * High current capability MECHANICAL DATA .052(1.3) DIA. * Case: Molded plastic .048(1.2) 1.0(25.4) * Epoxy: UL 94V-0 rated flame retardant MIN. * Lead: MIL-STD-202E, Method 208 guaranteed * Polarity: Color band denotes cathode end .375(9.5) * Mounting position: Any .335(8.5) * Weight: 1.18 gram approx. .220(5.6) DIA. .197(5.0) 1.0(25.4) MIN. MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS o Ratings at 25 C ambient temperature unless otherwise specified. Single phase, half wave, 60Hz, resistive or inductive load. For capacitive load, derate current by 20%. Dimensions in inches and (millimeters) SYMBOL BY251 BY252 BY253 BY254 BY255 UNITS Maximum Recurrent Peak Reverse Voltage VRRM Volts 200 400 600 800 1300 Maximum RMS Voltage VRMS Volts 140 280 420 560 910 Maximum DC Blocking Voltage VDC Volts 200 400 600 800 1300 Maximum Average Forward Rectified Current IO Amps o 3.0 375 (9.5mm) lead length at TA = 75 C Peak Forward Surge Current 8.3 ms single half sine-wave IFSM Amps 200 superimposed on rated load (JEDEC Method) Maximum Instantaneous Forward Voltage at 3.0A DC Volts VF 1.1 TA=25oC Maximum DC Reverse Current at Rated 5.0 DC Blocking Voltage TA=100oC 500 IR Amps Maximum Full Load Reverse Current Average, Full 30 Cycle .375(9.5mm) lead length at TL = 55oC Typical Junction Capacitance (Note 1) 40 CJ pF Typical Thermal Resistance (Note 2) RJA 30 oC/W Operating and Storage Temperature Range TJ,TSTG -55 to +150 oC Note 1: Measured at 1 MHz and applied reverse voltage of 4.0 volts. Note 2: Typical thermal resistance from junction to ambient. REV-3,MAY,2017 1 www.dccomponents.comRATING AND CHARACTERISTIC CURVES (BY251 THRU BY255) FIG. 2 FIG. 1 MAXIMUM NON-REPETITIVE FORWARD TYPICAL FORWARD CURRENT DERATING CURVE SURGE CURRENT 5.0 300 8.3ms Single Half Sine-Wave (JEDEC Method) 250 4.0 3.0 200 2.0 150 Single Phase Half Wave 60Hz 1.0 100 Resistive or Inductive Load 0 0 0 25 50 75 100 125 150 1 2 4 6 8 10 20 40 60 80 100 AMBIENT TEMPERATURE, (OC) NUMBER OF CYCLES AT 60Hz FIG. 3 FIG. 4 TYPICAL REVERSE CHARACTERISTICS TYPICAL INSTANTANEOUS FORWARD CHARACTERISTICS 100 1000 TJ=125OC 10 100 TJ=100OC TJ=25OC 1.0 Pulse Width=300s 1% Duty Cycle 10 0.1 0 1 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 TJ=25OC INSTANTANEOUS FORWARD VOLTAGE, (V) .1 0 20 40 60 80 100 120 140 FIG. 5 PERCENT OF RATED PEAK REVERSE VOLTAGE, (%) TYPICAL JUNCTION CAPACITANCE 200 100 60 40 20 10 TJ=25OC 6 4 2 1 .1 .2 .4 1.0 2 4 10 20 40 100 REVERSE VOLTAGE, (V) REV-3,MAY,2017 2 www.dccomponents.com INSTANTANEOUS FORWARD CURRENT, (A) AVERAGE FORWARD CURRENT, (A) JUNCTION CAPACITANCE, (pF) PEAK FORWARD SURGE CURRENT, (A) INSTANTANEOUS REVERSE CURRENT, (A)