Is there a pin-compatible replacement for SMF30A?

Yes, parts like Meritek's SMF30A are expected to be pin-compatible as they share the same package (SOD-123FL) and part number. A datasheet review is required to confirm pinout and polarity before assembly.

What risks should I check before replacing SMF30A?

Before replacing, check three main risks: 1) Package mismatch, as some alternatives are larger. 2) Polarity mismatch; ensure you use a 'Unidirectional' part, not a 'Bidirectional' ('CA') one. 3) Standoff voltage; it must be at least 30V to avoid clamping during normal operation.

SMF30A Alternatives, Datasheet & Cross Reference | Microdiode Semiconductor (Shenzhen) Co., Ltd.

The MDD SMF30A is a standard 200W, 30V unidirectional TVS diode in a compact SOD-123FL package. Several cross-vendor alternatives exist, making sourcing flexible, but careful verification of package and electrical parameters is crucial for a successful substitution.

AI replacement insight

Electrical riskmedium

Ensure substitute has Unidirectional polarity and a standoff voltage of at least 30V.

Package risklow

Most SMF30A parts use the same SOD-123FL package, but functional alternates may differ.

Can it be replaced directly?

Yes, other manufacturers offer parts named SMF30A in the same package. These are likely direct replacements, but datasheet verification of all key parameters is essential.

Best replacement path

Cross to another manufacturer's SMF30A, like Meritek, after verifying its polarity from the datasheet.

Main risk

The primary risk is substituting with a part that has a different polarity (e.g., bidirectional 'CA' versions) or a non-matching package.

Recommended alternatives

A likely pin-compatible alternative from a different vendor, pending datasheet verification of polarity.

View details

Alternative comparison matrix

Feature / factor	SMF30A	SMF30A	SMBJ30A	SMF24A	Compatibility / risk
Package	SOD-123FL	SOD-123FL	DO-214AA (SMB)	SOD-123FL	SOD-123FL / DO-214AA (SMB) — Package matches, enabling form-fit compatibility.; SMBJ30A: Larger package requires board layout change.; SMF24A: Package matches.
Voltage	30.0V	30.0V	30.0V	24.0V	30.0V / 24.0V — Reverse standoff voltage matches.; SMBJ30A: Standoff voltage matches.; SMF24A: Lower standoff voltage may clamp during normal operation.
Power	200.0W	200.0W	600.0W	-	200.0W / 600.0W — Peak pulse power rating matches.; SMBJ30A: Higher power rating provides more robustness.
Polarity Or Type	Unidirectional	Missing	Unidirectional	Unidirectional	Missing / Unidirectional — Polarity not specified in data; target is Unidirectional.; SMBJ30A: Polarity matches.; SMF24A: Polarity matches.
Current	4.1A	-	-	5.1A	5.1A — Higher peak pulse current rating.

Application & sourcing insights

Questions & answers

The best alternative is another manufacturer's SMF30A, such as from Meritek or Littelfuse, as it is most likely to be a direct match. However, you must verify the polarity is 'Unidirectional' from its datasheet.