2SD1554 NPN, 600V, 3.5A TO-3P - NPN silicon triple diffused transistor (with damper diode) intended as Color TV horizontal deflection output
Vceo- 600 V,VCBO - 1500VIc- 3.5 A, t - VCE=10V, IE= 1A typ - 3Mhzhfe.- 8Pt - 40W