5000 Vrms isolation with Darlington gain
The 6N139VM is a single-channel Darlington-output optocoupler from onsemi, delivering a minimum current transfer ratio of 500% at just 1.6 mA forward current. That gain margin means the LED side can be driven from a logic output without a buffer transistor — the 60 mA continuous output capability is enough to sink a relay coil or a PLC input module directly. The 240 ns turn-on and 1.3 µs turn-off times keep propagation delay low enough for 10–20 kHz switching signals.
Through-hole 8-DIP for serviceable designs
Packaged in an 8-DIP (0.300", 7.62 mm) through-hole body, the 6N139VM is a direct fit for boards that avoid SMT reflow — common in high-reliability or rework-friendly assemblies. The 8-DIP footprint matches the industry-standard 6N139 pinout, so a layout designed for the base 6N139 accepts this VDE-suffix variant without a board spin. The DC input type means the LED is forward-biased continuously — no AC line rectification needed on the primary side.