View 2sd2561 datasheet:

Equivalent circuit CBDarlington 2SD2561(70)ESilicon NPN Triple Diffused Planar Transistor (Complement to type 2SB1648)Application : Audio, Series Regulator and General Purpose Absolute maximum ratings (Ta=25C) Electrical Characteristics (Ta=25C) External Dimensions MT-200SymbolSymbol 2SD2561 Unit Conditions 2SD2561 Unit0.26.00.336.4ICBOVCBO 150 V VCB=150V 100max A0.224.42.1IEBO VEB=5V 100max AVCEO 150 V 2-3.20.19V(BR)CEO IC=30mA 150min VVEBO 5 VIC hFE VCE=4V, IC=10A 5000min17 AaIB VCE(sat) IC=10A, IB=10mA 2.5max Vb1 APC VBE(sat) IC=10A, IB=10mA 3.0max V200(Tc=25C) W2Tj fT VCE=12V, IE=2A 70typ MHz150 C30.65+0.2-0.1COB VCB=10V, f=1MHz 120typ pFTstg 55 to +150 C 1.05+0.2-0.1 hFE Rank O(5000to12000), P(6500to20000), Y(15000to30000) +0.33.0 -0.10.1 0.15.45

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