Is there a pin-compatible replacement for SMF28CA?

SMF26CA shares the same SOD-123FL package and pinout, but its lower 26V standoff voltage (vs. 28V) poses a risk of unintended clamping and requires careful circuit analysis before use.

What risks should I check before replacing SMF28CA?

Key risks include: 1) Package mismatch requiring PCB redesign. 2) Polarity mismatch (unidirectional vs. bidirectional). 3) Incorrect standoff voltage, which can either fail to protect the circuit or interfere with normal operation.

SMF28CA Alternatives, Datasheet & Cross Reference | Meritek

SMF28CA is a 200W bidirectional TVS diode in a compact SOD-123FL package for transient voltage protection. Finding a direct drop-in replacement requires careful matching of package, standoff voltage, and polarity.

AI replacement insight

Package riskhigh

Most alternatives are in larger SMB/SMC packages requiring redesign.

Electrical riskhigh

All candidates have different standoff voltages, posing a risk to circuit operation or protection.

Sourcing risklow

TVS diodes are common components with many manufacturers.

Can it be replaced directly?

No direct, risk-free drop-in replacement for SMF28CA is available. All candidates have significant differences in package or key electrical parameters like standoff voltage.

Best replacement path

Functional alternatives with higher power ratings (e.g., SMBJ30CA) exist but require a new board layout. For the same footprint, SMF26CA is an option but has a lower, riskier voltage rating.

Main risk

The primary risks are package incompatibility and incorrect standoff voltage, which could lead to circuit malfunction or damage.

Recommended alternatives

Shares the same package but has a lower standoff voltage, requiring careful electrical review before use.

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Alternative comparison matrix

Feature / factor	SMF28CA	SMF26CA	SMBJ30CA	Compatibility / risk
Package	SOD-123FL	SOD-123FL	DO-214AA (SMB)	SOD-123FL / DO-214AA (SMB) — Package matches, enabling form-fit evaluation.; SMBJ30CA: Larger package requires PCB redesign.
Polarity Or Type	Bidirectional	Bidirectional	Bidirectional	Bidirectional — Polarity matches target.; SMBJ30CA: Polarity matches target.
Voltage V	28.0V	26.0V	30.0V	26.0V / 30.0V — Lower standoff voltage may cause clamping in normal operation.; SMBJ30CA: Slightly higher standoff voltage; protection level is different.
Current A	4.4A	4.8A	-	4.8A — Higher peak pulse current offers more robustness.
Power W	200.0W	200.0W	600.0W	200.0W / 600.0W — Power rating matches target.; SMBJ30CA: Significantly higher power rating.

Application & sourcing insights

Questions & answers

No direct drop-in replacement has been identified. Functional alternatives like SMBJ30CA offer higher power but require a different PCB layout. Parametric alternatives like SMF26CA have a different voltage rating and must be carefully evaluated.