Is there a pin-compatible replacement for SM6T39A?

Yes, several parts like SM6T36A and SM6T30A use the same 2-pin SMB (DO-214AA) package. However, they are not electrically identical, so they are not drop-in replacements without review.

What risks should I check before replacing SM6T39A?

The most critical risk is the reverse standoff voltage (Vrwm). Ensure the replacement's Vrwm is equal to or slightly greater than 33.3V. Also verify peak power, peak current, and that the polarity is unidirectional.

SM6T39A Alternatives, Datasheet & Cross Reference | VISHAY

Finding a replacement for the SM6T39A TVS diode involves matching its 33.3V standoff voltage, 600W power rating, and SMB package. Alternatives exist but may require careful review of electrical parameters.

AI replacement insight

Electrical riskhigh

Standoff voltage mismatch is common in available alternatives.

Package risklow

The SMB (DO-214AA) package is widely available.

Can it be replaced directly?

No direct drop-in replacement has been identified. Candidates like SM6T36A have a lower standoff voltage, which is a critical parameter to verify.

Best replacement path

Parametric alternatives with a slightly lower standoff voltage are available, but require engineering review to ensure circuit compatibility.

Main risk

The primary risk is using a part with a lower standoff voltage (Vrwm), which could lead to unwanted clamping during normal operation.

Recommended alternatives

A parametric alternative with a much lower standoff voltage that requires careful electrical validation.

View details

Alternative comparison matrix

Feature / factor	SM6T39A	SM6T30A	SM6T36A	Compatibility / risk
Package	SMB (DO-214AA)	SMB (DO-214AA)	SMB (DO-214AA)	SMB (DO-214AA) — Same package and pin count.; SM6T36A: Same package and pin count.
Polarity Or Type	Unidirectional	Unidirectional	Unidirectional	Unidirectional — Polarity matches.; SM6T36A: Polarity matches.
Voltage V	33.3V	30.0V	30.8V	30.0V / 30.8V — Significantly lower standoff voltage.; SM6T36A: Lower standoff voltage requires review.
Current A	11.1A	14.5A	12.0A	14.5A / 12.0A — Higher peak current capability.; SM6T36A: Higher peak current capability.
Power W	600W	-	600W	600W — Power rating matches.

Application & sourcing insights

Questions & answers

Candidates like FUXINSEMI's SM6T36A are parametrically similar but have a lower standoff voltage (30.8V vs 33.3V). This requires careful review to ensure it's above your circuit's maximum operating voltage.