Is there a pin-compatible replacement for SMF22A?

SMF20A shares the same SOD-123FL package and pinout. However, its electrical characteristics, specifically the lower standoff voltage, differ from SMF22A, so it is not a direct pin-to-pin electrical equivalent and requires review.

What risks should I check before replacing SMF22A?

Key risks include: 1) Standoff Voltage: A lower voltage may cause unwanted clamping. 2) Peak Current: A lower rating reduces surge protection. 3) Polarity: Ensure the replacement is also unidirectional. 4) Package: Ensure the footprint matches.

SMF22A Alternatives, Datasheet & Cross Reference | Yangjie Technology

SMF22A is a 200W unidirectional TVS diode in a compact SOD-123FL package. Finding a direct, pin-compatible replacement requires careful matching of its 22V standoff voltage and 5.6A peak current rating.

AI replacement insight

Electrical riskmedium

Standoff voltage differences require circuit validation.

Package risklow

Alternatives in the same package are available, but require electrical checks.

Can it be replaced directly?

No direct, fully equivalent replacement was found. The closest candidate, SMF20A, has a lower standoff voltage.

Best replacement path

Parametric alternative (SMF20A) with voltage verification.

Main risk

Electrical mismatch, primarily the standoff voltage which dictates the protection level.

Recommended alternatives

A parametric alternative in the same package, but with a lower 20V standoff voltage that requires circuit validation.

View details

Alternative comparison matrix

Feature / factor	SMF22A	SMF20A	SMCJ28A	Compatibility / risk
Package	SOD-123FL	SOD-123FL	DO-214AB (SMC)	SOD-123FL / DO-214AB (SMC) — Package matches, likely form-fit compatible.; SMCJ28A: Package is completely different and much larger.
Polarity Or Type	Unidirectional TVS	Unidirectional TVS	Unidirectional	Unidirectional TVS — Polarity matches.; SMCJ28A: Polarity matches.
Voltage V	22.0V	20.0V	28.0V	20.0V / 28.0V — Lower standoff voltage may cause premature clamping.; SMCJ28A: Higher standoff voltage provides less protection.
Current A	5.6A	6.2A	33.1A	6.2A / 33.1A — Higher peak current rating provides more robust protection.; SMCJ28A: Significantly higher current rating.
Power W	200.0W	200.0W	1500.0W	200.0W / 1500.0W — Peak power rating matches.; SMCJ28A: Significantly higher power rating.

Application & sourcing insights

Questions & answers

There are no direct drop-in replacements among the candidates reviewed. SMF20A is a potential parametric alternative in the same package but has a lower 20V standoff voltage, which must be verified against your circuit's operating conditions.