Overview
The CNZ3731 series of optoisolators consist of a GaAs infrared LED which is optically coupled with a Si NPN Darlington phototransistor, and housed in a small DIL package. The series provides high I/O isolation voltage and high collector/emitter isolation voltage, as well as a high current transfer ratio (CTR). This opto isolator series also includes the two-channel CNC7C501 and the four channel CNZ3734, and A type of these models with increased collector to emitter breakdown voltage (VCEO> 350V).

Features
High collector to emitter breakdown voltage : VCEO> 300 V, A type : VCEO> 350 V
High current transfer ratio with Darlington phototransistor output: CTR = 4000% (typ.)
High I/O isolation voltage : VISO ≥5000 Vrms
Small DIL package for saving mounting space
A-type models have a guaranteed internal insulating distance of 0.4 mm

Applications
Telephones
Telephone exchange
FAX
Programmable controllers
Signal transfer between circuits with different potentials and impedances