Needs validationlow risk
Strong alternative with same package and improved voltage and temperature ratings. Pinout verification is recommended.
Best Alternatives to TLP621GB-1(UMW)
Finding a substitute for the TLP621GB-1(UMW) optocoupler involves matching its DIP-4 package and key electrical ratings. While several alternatives exist, the best options offer upgraded performance, but careful review of parameters like voltage, current, and input type is essential.
AI replacement insight
Package risklow
Multiple candidates are available in the same DIP-4 package, making physical replacement straightforward.
Electrical riskmedium
Several candidates have lower current ratings or different input types, requiring careful circuit analysis before substitution.
Can it be replaced directly?
Direct replacement for TLP621GB-1(UMW) should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
The strongest candidate is TLP785GB(UMW), which offers improved voltage and temperature ratings in the same package. Pinout verification is recommended.
Main risk
The main risk when substituting is ensuring that key electrical stress ratings like Collector-Emitter Voltage (VCEO) and Forward Current (IF) are not lower than the original part.
Recommended alternatives
3Alternative comparison matrix
| Feature / factor | TLP621GB-1(UMW) | TLP785GB(UMW) | TLP620(GB,F) | FOC-817D | Compatibility / risk |
|---|---|---|---|---|---|
| Package | DIP-4 | DIP-4 | DIP-4 | DIP-4 | DIP-4 — Package and pin count match.; TLP620(GB,F): Package and pin count match.; FOC-817D: Package and pin count match. |
| Voltage | 55 V | 80 V | 55 V | 80 V | 80 V / 55 V — Higher VCEO provides greater voltage margin.; TLP620(GB,F): Collector-Emitter Voltage (VCEO) matches.; FOC-817D: VCEO is higher, providing more margin. |
| Ctr | 100% - 600% | 100% - 600% | - | - | 100% - 600% — Current Transfer Ratio range matches. |
| Temperature | -55°C to 100°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 — Wider operating temperature range.; TLP620(GB,F): Operating temperature range matches.; FOC-817D: Operating temperature range is wider. |
| Interface | DC | - | AC, DC | - | AC, DC — Candidate supports AC input, target is DC only. May work in DC circuits but requires review. |
| Current | 60 mA | - | - | 50 mA | 50 mA — Forward Current (IF) rating is lower and must be verified for the application. |
Application & sourcing insights
Questions & answers
Verified drop-in options for TLP621GB-1(UMW) are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.