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