BY251 . . . 255 Series Data Sheet 3.0 Amp MINIATURE PLASTIC SILICON RECTIFIERS Description Mechanical Dimensions JEDEC D0-201AD .285 .375 .190 .210 1.00 Min. .050 typ. Features n LOW COST n DIFFUSED JUNCTION n HIGH CURRENT CAPABILITY n MEETS UL SPECIFICATION 94V-0 Electrical Characteristics @ 25oC. Maximum Ratings BY251 . . . 255 Series Units BY251 BY252 BY253 BY254 BY255 Peak Repetitive Reverse Voltage...VRRM 200 400 600 800 1300 Volts RMS Reverse Voltage...VR(rms) 140 280 420 560 910 Volts DC Blocking Voltage...VDC 200 400 600 800 1300 Volts Average Forward Rectified Current...IF(av) TA = 50°C (Note 3) ............................................. 3.0 ............................................... Amps Repetitive Peak Forward Surge Current...IFM ............................................. 20 ............................................... Amps Non-Repetitive Peak Forward Surge Current...IFSM @ Rated Current & Temp ............................................. 100 ............................................... Amps Forward Voltage @ 3.0A...VF ............................................. 1.1 ............................................... Volts DC Reverse Current...IR ............................................. 20 ............................................... µAmps Typical Thermal Resistance...RθJC (Note 2) ............................................. 30 ............................................... °C / W Operating & Storage Temperature Range...TJ, TSTRG ......................................... -50 to 150 .......................................... °C Page 9-14 3.0 Amp MINIATURE PLASTIC SILICON RECTIFIERS Instantaneous Forward Characteristics o Amps C/Watt Thermal Resistance Forward Voltage (Volts) Lead Length (mm) Forward Current Derating Curve LL = 10mm Resistive Load Amps Amps Peak Forward Surge Current TJ = 175°° C PW = 8.3ms BY251 . . . 255 Series Data Sheet Capacitive Load Number of Cycles @ 60 Hz NOTES: 1. Measured @ 1 MHZ and applied reverse voltage of 4.0V. 2. Thermal Resistance Junction to Ambient, Jedec Method. 3. When Mounted to heat sink, from body. TA = Ambient Temperature (°°C) Ratings at 25 Deg. C ambient temperature unless otherwise specified. Single Phase Half Wave, 60 HZ Resistive or Inductive Load. For Capacitive Load, Derate Current by 20%. Page 9-15