Is there a pin-compatible replacement for P6SMB33A?

SM6T33A and other candidates in the SMB (DO-214AA) package are form-fit compatible. True pin-to-pin electrical compatibility depends on detailed parameters. SM6T33A is the most likely pin-compatible replacement, but datasheet verification is essential.

What risks should I check before replacing P6SMB33A?

Key risks include polarity mismatch (unidirectional vs. bidirectional), insufficient standoff voltage (Vrwm) causing leakage, lower power/current ratings (Pppm/Ipp) reducing surge protection, and higher clamping voltage (Vc) offering less protection to the circuit.

P6SMB33A Alternatives, Datasheet & Cross Reference | FUXINSEMI

P6SMB33A is a 600W, 28.2V unidirectional TVS diode in an SMB package. Finding a substitute requires matching the package, polarity, and key electrical ratings like standoff voltage and peak power.

AI replacement insight

Electrical riskhigh

Using a part with incorrect polarity or lower standoff voltage can lead to immediate circuit failure.

Package risklow

Many alternatives exist in the same SMB (DO-214AA) package, making physical replacement straightforward.

Can it be replaced directly?

SM6T33A appears to be a direct replacement, but this requires datasheet verification as it has not been fully cross-validated.

Best replacement path

Start with SM6T33A due to identical specs. If unavailable, evaluate SM6T30A, checking for tolerance to its higher standoff voltage.

Main risk

The primary risk is selecting a part with a lower standoff voltage (Vrwm) or a different polarity (bidirectional), which can cause circuit malfunction.

Recommended alternatives

Strong candidate with identical package, polarity, standoff voltage, power, and current ratings.

View details

Alternative comparison matrix

Feature / factor	P6SMB33A	SM6T33A	SM6T30A	Compatibility / risk
Package	SMB (DO-214AA)	SMB (DO-214AA)	SMB (DO-214AA)	SMB (DO-214AA) — Package matches, ensuring form-fit compatibility.; SM6T30A: Package matches, ensuring form-fit compatibility.
Polarity Or Type	Unidirectional (inferred)	Unidirectional	-	Unidirectional — Polarity matches target's expected unidirectional configuration.
Voltage	28.2V	28.2V	30.0V	28.2V / 30.0V — Reverse standoff voltage is identical to the target.; SM6T30A: Higher standoff voltage provides more margin but must be checked.
Power	600W	600W	600W	600W — Peak pulse power rating is identical.; SM6T30A: Peak pulse power rating is identical.
Current	13.1A	13.1A	14.5A	13.1A / 14.5A — Peak pulse current rating is identical.; SM6T30A: Higher peak pulse current rating offers more robustness.

Application & sourcing insights

Questions & answers

The SM6T33A by FUXINSEMI is the strongest candidate, featuring identical key electrical parameters and package. As a functional alternative, SM6T30A from Vishay offers slightly higher voltage and current ratings.