This part is a kind of semiconductor called 4N33.

Function of this product has PHOTODARLINGTON OPTOCOUPLER.

Manufacturers : Siemens Semiconductor Group

Image and pinout :

Some of the text within the PDF file :

4N32/4N33 PHOTODARLINGTON OPTOCOUPLER FEATURES • Very High Current Transfer Ratio, 500% Min. • High Isolation Resistance, 1011 Ω Typical • Standard Plastic DIP Package • Underwriters Lab File #E52744 • V VDE Approvals #0884 (Available with Option 1) D E Dimensions in inches (mm) Pin One ID. 3 .248 (6.30) .256 (6.50) 4 5 6 2 1 Anode 1 Cathode 2 NC 3 6 Base 5 Collector 4 Emitter DESCRIPTION The 4N32 and 4N33 are optically coupled isolators with a Gallium Arsenide infrared LED and a silicon photodarlington sensor. Switching can be achieved while maintaining a high degree of isolation between driving and load circuits. These optocouplers can be used to replace reed and mercury relays with advantages of long life, high speed switching and elimination of magnetic fields. Maximum R [ ... ]

4N33 PDF Datasheet Download