Is there a pin-compatible replacement for 1SMB5929BT3G?

Yes, parts like 1SMB5928BT3G and SMBJ5355B share the same SMB (DO-214AA) package and 2-pin layout. However, their electrical parameters, especially Zener voltage, differ and require engineering review.

What risks should I check before replacing 1SMB5929BT3G?

The primary risk is the Zener voltage mismatch. Using a part with a different voltage (e.g., 13V or 18V instead of 15V) can lead to improper circuit regulation or failure. Always verify the new voltage is acceptable for your application.

1SMB5929BT3G Alternatives, Datasheet & Cross Reference | onsemi

Finding a replacement for the onsemi 1SMB5929BT3G, a 15V 3W Zener diode in an SMB package, requires careful matching of the Zener voltage. While no direct drop-in is identified, several functional and parametric alternatives exist that require engineering review.

AI replacement insight

Electrical riskhigh

All candidates have a different Zener voltage, which is a critical electrical parameter.

Package risklow

Candidates share the same SMB (DO-214AA) package, ensuring physical compatibility.

Can it be replaced directly?

No direct, one-to-one replacement for the 1SMB5929BT3G has been identified. All viable candidates require an engineering review of their Zener voltage.

Best replacement path

Review the application's voltage tolerance. If a slightly higher voltage is acceptable, SMBJ5355B is a robust option. If a lower voltage can be used, 1SMB5928BT3G is from the same product family.

Main risk

The most significant risk is using a substitute with an incorrect Zener voltage, which will compromise the voltage regulation function of the circuit.

Recommended alternatives

A form-fit compatible Zener diode from the same series, but with a lower nominal voltage of 13V.

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Alternative comparison matrix

Feature / factor	1SMB5929BT3G	1SMB5928BT3G	SMBJ5355B	Compatibility / risk
Package	SMB (DO-214AA)	SMB (DO-214AA)	SMB (DO-214AA)	SMB (DO-214AA) — Same package and pin count ensures form-fit compatibility.; SMBJ5355B: Same package ensures form-fit compatibility.
Voltage	15.0V	13.0V	18V	13.0V / 18V — Lower Zener voltage will change the regulation point.; SMBJ5355B: Higher Zener voltage will change the regulation point.
Power	3.0W	3.0W	5.0W	3.0W / 5.0W — Identical power rating.; SMBJ5355B: Higher power rating provides more thermal margin.
Manufacturer	onsemi	onsemi	Slkor(SLKORMICRO Elec.)	onsemi / Slkor(SLKORMICRO Elec.) — Same manufacturer and product family.; SMBJ5355B: Different manufacturer may have process variations.

Application & sourcing insights

Questions & answers

There is no direct drop-in replacement. The best alternative depends on your circuit's voltage tolerance. SMBJ5355B offers higher power but at 18V, while 1SMB5928BT3G is in the same family but at a lower 13V.