Is there a pin-compatible replacement for 1SMB5919BT3G?

Yes, several Zener diodes use the same 2-pin SMB (DO-214AA) package. However, a true drop-in replacement requires matching the 5.6V Zener voltage and 3W power rating, which must be verified from datasheets.

What risks should I check before replacing 1SMB5919BT3G?

Key risks include Zener voltage deviation, which can affect regulation accuracy, and differences in dynamic impedance or temperature characteristics. Always verify the substitute's datasheet against your application's needs.

1SMB5919BT3G Alternatives, Datasheet & Cross Reference | onsemi

The onsemi 1SMB5919BT3G is a 3W, 5.6V Zener diode in an SMB package, used for voltage regulation. Finding a substitute requires matching the package, power rating, and Zener voltage.

AI replacement insight

Electrical riskmedium

Zener voltage differs by up to 11%, which may be outside the acceptable range for the application.

Package risklow

The SMB (DO-214AA) package is a widely used industry standard.

Can it be replaced directly?

No exact drop-in replacement was found. The closest options have slightly different Zener voltages (5.1V or 6.2V) and require engineering validation.

Best replacement path

Cross-vendor parametric alternatives like SUNMATE 1SMB3EZ5.1 or ZHIDE SMB5341A offer similar form and power but require voltage tolerance checks.

Main risk

The primary risk is the Zener voltage mismatch, which could impact the stability and accuracy of the regulated voltage rail.

Recommended alternatives

A potential alternative in the same SMB package and power rating, but with a slightly lower Zener voltage.

View details

Alternative comparison matrix

Feature / factor	1SMB5919BT3G	1SMB3EZ5.1	SMB5341A	Compatibility / risk
Package	SMB (DO-214AA)	SMB (DO-214AA)	SMB (DO-214AA)	SMB (DO-214AA) — Form and fit are compatible.; SMB5341A: Form and fit are compatible.
Voltage	5.6V	5.1V	6.2V	5.1V / 6.2V — Candidate voltage is ~9% lower, requires circuit tolerance check.; SMB5341A: Candidate voltage is ~11% higher, requires circuit tolerance check.
Power	3.0W	3.0W	5.0W	3.0W / 5.0W — Power rating matches target.; SMB5341A: Higher power rating is a safe upgrade.
Manufacturer	onsemi	SUNMATE	ZHIDE	SUNMATE / ZHIDE — Cross-vendor alternative.; SMB5341A: Cross-vendor alternative.

Application & sourcing insights

Questions & answers

Candidates like SUNMATE 1SMB3EZ5.1 (5.1V) or ZHIDE SMB5341A (6.2V) are potential alternatives in the same package, but require engineering review due to slight voltage differences.