2sa1812 2sa1727 2sa1776.pdf datasheet:

2SA1812 / 2SA1727 / 2SA1776TransistorsHigh-voltage Switching Transistor( 400V, 0.5A)2SA1812 / 2SA1727 / 2SA1776 Features1) High breakdown voltage, BVCEO= 400V.2) Low saturation voltage, typically VCE (sat) = 0.3V at IC / IB = 100mA / 10mA.3) High switching speed, typically tf : 1 s at IC = 100mA.4) Wide SOA (safe operating area). Absolute maximum ratings (Ta=25C)Parameter Symbol Limits UnitCollector-base voltage VCBO 400 VCollector-emitter voltage VCEO 400 VEmitter-base voltage VEBO 7 V0.5 A (DC)Collector current IC1.0 A (Pulse) 10.5 W2SA18122 W 2Collector power1 WPC2SA1727dissipation10 W (Tc 25C)2SA1776 1 W3Junction temperatureTj 150 CStorage temperature CTstg 55 to +1501 Single pulse 2 When mounted on a 40 40 0.7mm ceramic board.3 When t = 1.7mm and the foil collector area on the PC board is 1cm2 or greater.