This part is a kind of semiconductor called 4N35.

Function of this product has PHOTO TRANSISTOR (AC LINE/DIGITAL LOGIC ISOLATOR).

Manufacturers : Toshiba Semiconductor

Image and pinout :

Some of the text within the PDF file :

4N35,4N36,4N37(Short) TOSHIBA Photocoupler GaAs IRed & Photo−Transistor 4N35(Short), 4N36(Short), 4N37(Short) AC Line / Digital Logic Isolator. Digital Logic / Digital Logic Isolator. Telephone Line Receiver. High Frequency Power Supply Feedback Control. Relay Contact Monitor. The TOSHIBA 4N35 (short) through 4N37 (short) consists of a gallium arsenide infrared emitting diode coupled with a silicon phototransistor in a dual in−line package. · Switching speeds: 3µs (typ.) · DC current transfer ratio: 100% (min.) · Isolation resistance: 1011Ω (min.) · Isolation voltage: 2500Vrms (min.) · UL recognized: UL1577, file no. E67349 Unit in mm TOSHIBA Weight: 0.4 g 11−7A8 Pin Configurations(top view) 1 2002-09-25 4N35,4N36,4N37(Short) Maximum Ratings (Ta = 25°C) LED Detecto [ ... ]

4N35 PDF Datasheet Download