View 2sd1221 datasheet:

SMD Type TransistorsNPN Transistors2SD1221TO-252Unit: mm6.50+0.15-0.15+0.12.30 -0.1 Features5.30+0.2 0.50 +0.8-0.2-0.7 Low collector saturation voltage : VCE (sat) = 0.4 V (typ.) (IC = 3 A, IB = 0.3 A) High power dissipation: PC = 20 W (Tc = 25C) 0.1270.80+0.1 max-0.1 Complementary to 2SB9062.3 0.60+ 0.1 1 Base- 0.1+0.154.60 -0.152 Collector3 Emitter Absolute Maximum Ratings Ta = 25Parameter Symbol Rating Unit Collector - Base Voltage VCBO 60 Collector - Emitter Voltage VCEO 60 V Emitter - Base Voltage VEBO 7 Collector Current - Continuous IC 3A Base Current IB 0.5 Collector Power Dissipation Ta = 25 1PC W Tc = 25 20 Junction Temperature TJ 150 Storage Temperature Range Tstg -55 to 150 Electrical Characteristics Ta = 25Parameter Symbol Test Conditions Min Typ Max Unit

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