onsemi FOD8173SD, single-channel DC-input transistor-output optoisolator, 5000Vrms isolation, 4-SMD gull-wing package, -55°C to 110°C operating range.
| Parameter | Value |
|---|---|
| Input type | DC |
| Output type | Transistor |
| Mounting | Surface Mount |
| Voltage - isolation | 5000Vrms |
| Voltage - output | 70V |
| Voltage - forward (Vf) | 1.2V |
| Current - output (Channel) | 50mA |
| Current transfer ratio | 600% @ 5mA |
| Current - DC forward (If) | 50 mA |
| Operating temperature | -55°C~110°C |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Case | 4-SMD, Gull Wing |
| Channels | 1 |
| Vce saturation | 200mV |
| Rise (Fall time) | 4µs, 3µs |
The FOD8173SD is a single-channel optoisolator from onsemi's FOD817 family, offering 5000Vrms isolation between a DC input and a transistor output.
Current transfer ratio spans 50% minimum to 600% maximum at 5 mA forward current — a wide range that forces the designer to check the minimum CTR at the actual operating If to guarantee the output saturates into the load.
Within the FOD817 family, the base number FOD817 covers multiple CTR and package variants. The FOD8173SD is the surface-mount gull-wing variant; a through-hole DIP-4 sibling like the FOD817A would not be pin-compatible due to the different lead form.
At 5 mA forward current, the output transistor can deliver anywhere from 50% to 600% of that current into the collector. The minimum CTR (50%) sets the worst-case drive capability — size the pull-up resistor and the load current so the output saturates even at the low end of the CTR spread.