This part is a kind of semiconductor called BD204.

Function of this product has PNP PLASTIC POWER TRANSISTORS.

Manufacturers : CDIL

Image and pinout :

Some of the text within the PDF file :

Continental Device India Limited An ISO/TS 16949, ISO 9001 and ISO 14001 Certified Company TO-220 Plastic Package BD202, BD204, BDX78 BD202, BD204, BDX78 PNP PLASTIC POWER TRANSISTORS Complementary BD201, BD203 and BDX77 Medium Power Switching and Amplifier Applications N LH BF C E 12 3 A OO K D G J M All diminsions in mm. PIN CONFIGURATION 1. BASE 2. COLLECTOR 3. EMITTER 4. COLLECTOR 1 2 3 DIM MIN . MAX. A 14.42 16.51 B 9.63 10.67 C 3.56 4.83 D 0.90 E 1.15 1.40 F 3.75 3.88 G 2.29 2.79 H 2.54 3.43 J 0.56 K 12.70 14.73 L 2.80 4.07 M 2.03 2.92 N 31.24 O DEG 7 4 ABSOLUTE MAXIMUM RATINGS Collector-base voltage (open emitter) Collector-emitter voltage (open base) Collector current (DC) Total power dissipation up to Tmb = 25°C Junction temperature Collector-emitter saturation volt [ ... ]

BD204 PDF Datasheet Download