FOC-817D
Ningbo Songle Relay Co., Ltd.
Needs validationlow risk
A strong alternative matching key specs, but with a slightly lower forward current rating.
Best Alternatives to TLP785GB(UMW)
The TLP785GB(UMW) is a general-purpose DIP-4 optocoupler with an 80V phototransistor output. Finding a substitute requires checking collector voltage, forward current, and package lead style.
AI replacement insight
Electrical riskhigh
Several candidates have lower voltage or current ratings.
Package riskmedium
One candidate is an SMD variant of the through-hole target.
Can it be replaced directly?
No direct drop-in replacement was found. FOC-817D is parametrically close but has a lower forward current rating. All candidates require engineering review.
Best replacement path
FOC-817D is a strong candidate if the application's forward current is below 50mA. For different footprints, TLP785GB-S(UMW) is an electrical match with SMD leads.
Main risk
The primary risks are mismatched collector-emitter voltage (VCEO) and different package lead forms (SMD vs. through-hole).
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | TLP785GB(UMW) | FOC-817D | TLP785GB-S(UMW) | TLP621GB-1(UMW) | Compatibility / risk |
|---|---|---|---|---|---|
| Package | DIP-4 | DIP-4 | DIP-4 (SMD leads) | DIP-4 | DIP-4 / DIP-4 (SMD leads) — Package and pin count match.; TLP785GB-S(UMW): Likely SMD lead form ('-S' suffix) vs through-hole.; TLP621GB-1(UMW): Package and pin count match.; TLP620(GB,F): Package matches. |
| Voltage | 80 V | 80 V | 80 V | 55 V | 80 V / 55 V — Collector-Emitter Voltage (VCEO) matches.; TLP785GB-S(UMW): Collector-Emitter Voltage (VCEO) matches.; TLP621GB-1(UMW): Collector-Emitter Voltage (VCEO) is lower.; TLP620(GB,F): Collector-Emitter Voltage (VCEO) is lower. |
| Current | 60 mA | 50 mA | - | - | 50 mA — Max forward current is lower. |
| Temperature | -55°C to +110°C | -55°C to +110°C | -55°C to 110°C | -55°C to 100°C | -55°C to +110°C / -55°C to 110°C / -55°C to 100°C — Operating temperature range matches.; TLP785GB-S(UMW): Operating temperature range matches.; TLP621GB-1(UMW): Max operating temperature is lower.; TLP620(GB,F): Max operating temperature is lower. |
| Interface | DC | - | DC | - | DC / AC, DC — Input type matches.; TLP620(GB,F): Candidate has AC/DC input vs target's DC-only. |
| Ctr | 100% - 600% | - | - | 100% - 600% | 100% - 600% — Current Transfer Ratio matches. |
Application & sourcing insights
Questions & answers
FOC-817D is a strong functional alternative, matching key specs like VCEO and temperature, but has a lower forward current (50mA vs 60mA). TLP785GB-S(UMW) is an electrical match but in an SMD package.