6N139

Features 

• Low current – 0.5mA 

• Superior CTR-2000% 

• CTR guaranteed 0–70°C 

Applications 

• Digital logic ground isolation 

• Telephone ring detector 

• EIA-RS-232C line receiver 

• High common mode noise line receiver 

• μP bus isolation 

• Current loop receiver 

Description 

The 6N138 & 6N139 optocouplers consist of an 

AlGaAs LED optically coupled to a high gain split 

darlington photodetector. 

The combination of a very low input current of 

0.5mA and a high current transfer ratio of 2000% 

makes this family particularly useful for input 

interface to MOS, CMOS, LSTTL and EIA RS232C, 

while output compatibility is ensured to CMOS as 

well as high fan-out TTL requirements. 

The devices are packaged in an 8-pin DIP package 

and also available in gullwing (400mil) spacing and

surface mount lead forming option.