This part is a kind of semiconductor called MCT2.

Function of this product has PHOTOTRANSISTOR OPTOCOUPLERS.

Manufacturers : Fairchild

Image and pinout :

Some of the text within the PDF file :

PHOTOTRANSISTOR OPTOCOUPLERS MCT2 MCT2200 MCT2E MCT2201 MCT210 MCT2202 MCT271 WHITE PACKAGE (-M SUFFIX) BLACK PACKAGE (NO -M SUFFIX) 6 6 1 1 6 1 6 1 6 6 1 1 DESCRIPTION The MCT2XXX series optoisolators consist of a gallium arsenide infrared emitting diode driving a silicon phototransistor in a 6-pin dual in-line package. FEATURES • UL recognized (File # E90700) • VDE recognized (File # 94766) -Add option V for white package (e.g., MCT2V-M) -Add option 300 for black package (e.g., MCT2.300) • MCT2 and MCT2E are also available in white package by specifying -M suffix, eg. MCT2-M 1 SCHEMATIC 6 2 5 3 NC 4 APPLICATIONS • Power supply regulators • Digital logic inputs • Microprocessor inputs PIN 1. ANODE 2. CATHODE 3. NO CONNECTION 4. EMITTER 5. COLLECTOR 6. BASE [ ... ]

MCT2 PDF Datasheet Download