Is there a pin-compatible replacement for SMBJ28A?

Yes, parts like SMBJ26A and SMBJ36A are in the same SMB (DO-214AA) package and are pin-compatible. However, their electrical characteristics differ, so they are not drop-in replacements and require engineering review.

What risks should I check before replacing SMBJ28A?

Key risks are: 1) Standoff Voltage: A lower voltage (e.g., 26V) may cause unwanted clamping. 2) Clamping Voltage: A higher voltage (e.g., 58.1V) may not adequately protect the downstream circuit. 3) Polarity: Ensure the replacement is also unidirectional.

SMBJ28A Alternatives, Datasheet & Cross Reference | onsemi

Finding a substitute for the SMBJ28A TVS diode requires matching its 28V standoff voltage, 600W power rating, and unidirectional polarity in the SMB package. Alternatives exist but have different voltage ratings requiring review.

AI replacement insight

Electrical riskhigh

Key voltage parameters differ in all candidates, requiring careful analysis.

Package risklow

Candidates share the common DO-214AA (SMB) package.

Can it be replaced directly?

No direct, drop-in replacement for the SMBJ28A has been identified. All candidates require review due to differences in standoff or clamping voltages.

Best replacement path

Reviewing parametric alternatives like SMBJ26A if a slightly lower standoff voltage (26V) is tolerable for the application.

Main risk

The primary risk is mismatch in standoff and clamping voltages, which can lead to either nuisance tripping or inadequate circuit protection.

Recommended alternatives

A form-fit compatible TVS diode, but with a lower 26V standoff voltage that requires engineering review.

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Alternative comparison matrix

Feature / factor	SMBJ28A	SMBJ26A	SMBJ36A	Compatibility / risk
Package	DO-214AA (SMB)	DO-214AA (SMB)	SMB (DO-214AA)	DO-214AA (SMB) / SMB (DO-214AA) — Same package family.; SMBJ36A: Same package family.
Polarity	Unidirectional	Unidirectional	Unidirectional	Unidirectional — Target polarity inferred as unidirectional.; SMBJ36A: Polarity matches.
Voltage	28V	26V	36V	26V / 36V — Lower standoff voltage.; SMBJ36A: Higher standoff voltage is safer.
Power	600W	600W	-	600W — Peak pulse power matches.
Clamping Voltage	45.4V	42.1V	58.1V	42.1V / 58.1V — Lower clamping voltage is better.; SMBJ36A: Higher clamping voltage offers less protection.
Current	13.22A	-	10.3A	10.3A — Lower peak pulse current rating.

Application & sourcing insights

Questions & answers

No direct drop-in replacement is identified. The SMBJ26A has a lower standoff voltage, while the SMBJ36A offers weaker protection. The best choice depends on your circuit's specific voltage margins and protection requirements.