6N139 Overview
High mon mode transient immunity and very high current ratio are achieved by coupling and LED with an integrated high gain photo detector in an eight pin dual-in-line package. Separate pins for the photo diode and output stage enable TTL patible saturation voltages with high speed operation. Access to the base terminal allows adjustment to the gain bandwidth.
6N139 Key Features
- 400 % (min) high current transfer ratio
- 0.5 mA low input drive current
- Enhanced CTI of 275
- 10 kV/μs (typ.) high mon mode transient
- Material categorization


