CT Micro Rev 1
Proprietary & Confidential Page 1 Aug, 2013
6N138, 6N139
Low Input Current Photodarlington Coupler
Package Outline Schematic
Note: Different lead forming options available. See package
dimension.
Features
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• Low current – 0.5mA
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• Superior CTR-2000%
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• CTR guaranteed 0–70°C
Applications
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• Digital logic ground isolation
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• Telephone ring detector
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• EIA-RS-232C line receiver
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• High common mode noise line receiver
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• P bus isolation
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• 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.