Is there a pin-compatible replacement for SMBJ5349B-TP?

While other diodes exist in the same DO-214AA package, no direct pin-compatible replacements with identical key electrical parameters were identified in this analysis. Any substitute requires engineering review.

What risks should I check before replacing SMBJ5349B-TP?

Key risks include differences in Zener voltage (Vz), power dissipation, and dynamic impedance (Zzt). An incorrect voltage will cause circuit malfunction, so this must be the top priority for verification.

SMBJ5349B-TP Alternatives, Datasheet & Cross Reference | Micro Commercial Components Corp.

SMBJ5349B-TP is a 5W, 12V Zener diode in a standard DO-214AA (SMB) package from Micro Commercial Co. It is commonly used for voltage regulation and clamping in a variety of electronic circuits.

AI replacement insight

Electrical riskhigh

Zener voltage is a critical parameter; deviation requires redesign.

Package risklow

The DO-214AA (SMB) package is standardized, making physical replacement straightforward.

Can it be replaced directly?

No direct pin-to-pin replacements with identical key parameters were found in this review. All potential alternatives require careful validation of the Zener voltage.

Best replacement path

Search for Zener diodes with a 12V nominal voltage, 5W or greater power rating, and a DO-214AA (SMB) package.

Main risk

The primary risk in substituting this part is a Zener voltage mismatch, which will alter the circuit's voltage regulation or clamping point, likely causing malfunction.

Recommended alternatives

A potential downgrade with the same package and power, but a lower Zener voltage (10V).

View details

Alternative comparison matrix

Feature / factor	SMBJ5349B-TP	SMBJ5347B-TP	SMBJ5355B-TP	Compatibility / risk
Voltage	12V	10V	18V	10V / 18V — Candidate Zener voltage is lower, posing a downgrade risk.; SMBJ5355B-TP: Candidate Zener voltage is significantly higher.
Power	5W	5W	5W	5W — Power rating is identical.; SMBJ5355B-TP: Power rating is identical.
Package	DO-214AA (SMB)	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB — Package is form-fit compatible.; SMBJ5355B-TP: Package is form-fit compatible.
Temperature	-55°C to +150°C	-55°C to +150°C	-55°C to +150°C	-55°C to +150°C — Operating temperature range is identical.; SMBJ5355B-TP: Operating temperature range is identical.

Application & sourcing insights

Questions & answers

The best alternative is another Zener diode with a 12V nominal voltage, 5W or higher power rating, and a DO-214AA (SMB) package. Always verify the full datasheet before substitution.