Is there a pin-compatible replacement for SMBJ28CA?

While parts like SMBJ30CA and SMBJ26CA share the same SMB package, they have different electrical parameters (voltage, current) and are not direct drop-in replacements without review.

What risks should I check before replacing SMBJ28CA?

Key risks include: 1) Standoff Voltage: ensure the replacement's voltage doesn't clip your signal or leave the circuit unprotected. 2) Peak Current/Power: ensure the replacement can handle expected surges. 3) Package: verify the footprint matches your PCB layout.

SMBJ28CA Alternatives, Datasheet & Cross Reference | Microdiode Semiconductor (Shenzhen) Co., Ltd.

SMBJ28CA is a 600W, 28V bidirectional TVS diode in a standard SMB package for transient voltage protection. Alternatives often involve trade-offs in standoff voltage or require package changes.

AI replacement insight

Electrical riskmedium

Candidates have different standoff voltages or current ratings.

Package riskhigh

Functional alternatives like SMCJ36CA are in a different package.

Sourcing risklow

The SMBJ family is widely available from multiple manufacturers.

Can it be replaced directly?

No direct, verified pin-to-pin replacement has been identified. All candidates have parametric differences or different packages requiring engineering review.

Best replacement path

For similar performance, consider other SMBJ series parts like SMBJ30CA, but carefully check the lower current rating. For a new design, SMCJ series offers higher power in a larger package.

Main risk

The main risks are mismatched standoff voltage, which can affect circuit operation, and different package footprints requiring PCB redesign.

Recommended alternatives

A parametric alternative in the same package with higher current but a lower standoff voltage that must be verified.

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Alternative comparison matrix

Feature / factor	SMBJ28CA	SMBJ26CA	SMBJ30CA	SMCJ36CA	Compatibility / risk
Package	DO-214AA, SMB	SMB (DO-214AA)	DO-214AA (SMB)	DO-214AB (SMC)	SMB (DO-214AA) / DO-214AA (SMB) / DO-214AB (SMC) — Package is form-factor compatible.; SMBJ30CA: Package is form-factor compatible.; SMCJ36CA: Larger package, not a drop-in replacement.
Polarity Or Type	Bidirectional	Bidirectional	Bidirectional	Bidirectional	Bidirectional — Polarity matches.; SMBJ30CA: Polarity matches.; SMCJ36CA: Polarity matches.
Voltage V	28.0V	26.0V	30.0V	36.0V	26.0V / 30.0V / 36.0V — Lower standoff voltage may cause unwanted clamping.; SMBJ30CA: Slightly higher standoff voltage, offers more headroom.; SMCJ36CA: Significantly higher standoff voltage.
Current A	13.3A	14.3A	12.4A	-	14.3A / 12.4A — Higher peak pulse current is an improvement.; SMBJ30CA: Lower peak pulse current rating is a downgrade.
Power W	600.0W	-	600.0W	1500.0W	600.0W / 1500.0W — Power rating matches.; SMCJ36CA: Significantly higher power rating.

Application & sourcing insights

Questions & answers

There is no single best alternative. SMBJ30CA is similar but has a lower current rating. SMBJ26CA has a lower standoff voltage. SMCJ36CA is a higher-power option but requires a different PCB layout.