DESCRIPTION
The 4N25, 4N26, 4N27, and 4N28 series of optocouplers have NPN silicon planar phototransistor optically coupled to a gallium arsenide diode.

FEATURES & APPLICATIONS
■ AC line/digital logic isolator
■ Digital logic/digital logic isolator
■ Telephone/telegraph line receiver
■ Twisted pair line receiver
■ High frequency power supply feedback control
■ Relay contact monitor
■ Power supply monitor
■ Small package size and low cost
■ Excellent frequency response
■ UL recognized - File E90700