This part is a kind of semiconductor called KTA1023.

Function of this product has EPITAXIAL PLANAR PNP TRANSISTOR.

Manufacturers : KEC

Image and pinout :

Some of the text within the PDF file :

SEMICONDUCTOR TECHNICAL DATA HIGH VOLTAGE APPLICATION. FEATURE Complementary to KTC1027. MAXIMUM RATING (Ta=25 ) CHARACTERISTIC SYMBOL Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current Emitter Current Collector Power Dissipation Junction Temperature VCBO VCEO VEBO IC IE PC Tj Storage Temperature Range Tstg RATING -120 -120 -5 -800 800 1 150 -55 150 UNIT V V V mA mA W O D KTA1023 EPITAXIAL PLANAR PNP TRANSISTOR BD G JA R P DEPTH:0.2 C Q K FF HH M EM 123 HL NN 1. EMITTER 2. COLLECTOR 3. BASE DIM MILLIMETERS A 7.20 MAX B 5.20 MAX S C 0.60 MAX D 2.50 MAX E 1.15 MAX F 1.27 G 1.70 MAX H 0.55 MAX J 14.00+_ 0.50 K H L 0.35 MIN 0.75+_ 0.10 M4 N 25 O 1.25 P Φ1.50 Q 0.10 MAX R 12.50 +_ 0.50 S 1.00 TO-92L ELECTRICAL CHARACTER [ ... ]

KTA1023 PDF Datasheet Download