Is there a pin-compatible replacement for SMBJ5349B?

While several parts share the same 2-pin SMB package, no direct pin-to-pin replacements with an identical 12V Zener voltage were found in this analysis. Alternatives require parametric validation.

What risks should I check before replacing SMBJ5349B?

The primary risk is the Zener voltage. Using a part with a different Vz (e.g., 13V instead of 12V) will change the circuit's voltage regulation point. Also, verify power dissipation, Zener impedance, and temperature range.

SMBJ5349B Alternatives, Datasheet & Cross Reference | Slkor(SLKORMICRO Elec.)

Finding a substitute for the SMBJ5349B 12V 5W Zener diode involves checking key electrical parameters. While form-fit matches exist, careful review of the Zener voltage is crucial for proper circuit operation.

AI replacement insight

Electrical riskmedium

Zener voltage differs, requiring circuit validation.

Package risklow

Candidates share the same SMB package.

Can it be replaced directly?

No direct drop-in replacement was identified. The closest options have a different Zener voltage (13V vs 12V).

Best replacement path

Parametric alternative

Main risk

The Zener voltage mismatch is the main risk, potentially causing improper voltage regulation or downstream component damage.

Recommended alternatives

A 5W Zener diode in the same SMB package, but with a 13V nominal voltage instead of 12V. Requires engineering review.

View details

Alternative comparison matrix

Feature / factor	SMBJ5349B	SMB5350B	SMBJ5350B	Compatibility / risk
Package	SMB (DO-214AA)	SMB/DO-214AA	SMB (DO-214AA)	SMB/DO-214AA / SMB (DO-214AA) — Package matches, ensuring form and fit.; SMBJ5350B: Package matches, ensuring form and fit.
Voltage	12.0V	13.0V	13.0V	13.0V — Zener voltage is higher than target.; SMBJ5350B: Zener voltage is higher than target.
Power	5.0W	5.0W	5.0W	5.0W — Power rating matches.; SMBJ5350B: Power rating matches.
Zener Impedance	2.5Ω	2.5Ω	2.5Ω	2.5Ω — Zener impedance matches.; SMBJ5350B: Zener impedance matches.
Reverse Leakage	2.0μA	-	1uA @ 9.4V	1uA @ 9.4V — Candidate has lower (better) leakage.

Application & sourcing insights

Questions & answers

Candidates like SMBJ5350B offer the same package and power rating but have a 13V Zener voltage. This is a parametric alternative that requires engineering review to ensure the higher voltage is acceptable for your application.