This part is a kind of semiconductor called STM8500.

Function of this product has Dual Enhancement Mode Field Effect Transistor.

Manufacturers : SamHop Microelectronics

Image and pinout :

Some of the text within the PDF file :

S T M8500 S amHop Microelectronics C orp. Arp,20 2005 ver1.2 Dual E nhancement Mode Field E ffect Transistor ( N and P Channel) P R ODUC T S UMMAR Y (N-C hannel) V DS S 55V P R ODUC T S UMMAR Y (P -C hannel) V DS S -55V ID 4.5A R DS (ON) ( m W ) Max ID -3A R DS (ON) ( m W ) Max 50 @ V G S = 10V 75 @ V G S = 4.5V D1 8 110 @ V G S = -10V 145 @ V G S = -4.5V D1 7 D2 6 D2 5 S O-8 1 1 2 3 4 S1 G1 S 2 G2 ABS OLUTE MAXIMUM R ATINGS (T A=25 C unless otherwise noted) P arameter Drain-S ource Voltage R ating Drain-S ource Voltage Gate-S ource Voltage Drain C urrent-C ontinuous @ Ta -P ulsed b a S ymbol Vspike V DS V GS 25 C 70 C ID IDM IS PD T J , T S TG d N-C hannel P-C hannel 60 55 20 4.5 3.8 20 1.7 2 1.44 -55 to 150 -60 -55 20 -3 -2.5 -15 -1.7 Unit V V V A A A A W C Drain-S [ ... ]

STM8500 PDF Datasheet Download