Is there a pin-compatible replacement for SMF26A?

Yes, several parts like TPSMF4L28A use the same SOD-123FL package and 2-pin layout. However, electrical parameters like standoff voltage must be carefully checked to ensure functional compatibility.

What risks should I check before replacing SMF26A?

First, ensure the replacement is unidirectional. Second, verify the standoff voltage (VRWM) is at or slightly above 26V. A lower voltage may cause unwanted clamping. Finally, check that peak power and current ratings are equal to or greater than the original's 200W and 4.8A.

SMF26A Alternatives, Datasheet & Cross Reference | Microdiode Semiconductor (Shenzhen) Co., Ltd.

SMF26A is a popular 26V unidirectional TVS diode in a SOD-123FL package for signal and power line protection. When searching for alternatives, key parameters are polarity, standoff voltage, and power rating.

AI replacement insight

Electrical riskhigh

Incorrect polarity or voltage can cause circuit failure.

Package risklow

SOD-123FL is a common package with good availability.

Can it be replaced directly?

No exact drop-in replacement was found. TPSMF4L28A is a strong candidate but has a slightly higher 28V standoff voltage. SMF24A has a lower 24V standoff voltage and requires circuit validation.

Best replacement path

The best path is finding an upgrade like TPSMF4L28A, which offers higher power/current ratings. Downgrades like SMF24A exist but carry voltage risks.

Main risk

The main risks are polarity mismatch (unidirectional vs. bidirectional) and incorrect standoff voltage, which can fail to protect or interfere with operation.

Recommended alternatives

A potential upgrade with higher power and current ratings in the same SOD-123FL package.

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Alternative comparison matrix

Feature / factor	SMF26A	TPSMF4L28A	SMF24A	Compatibility / risk
Package	SOD-123FL (SMF)	SOD-123FL	SOD-123FL	SOD-123FL — Same package family ensures form-fit compatibility.; SMF24A: Same package family ensures form-fit compatibility.
Polarity	Unidirectional	Uni-directional	Unidirectional	Uni-directional / Unidirectional — Polarity matches the target part.; SMF24A: Polarity matches the target part.
Voltage	26.0V	28.0V	24.0V	28.0V / 24.0V — Slightly higher standoff voltage, offers more headroom.; SMF24A: Lower standoff voltage may clamp during normal operation.
Power	200.0W	400.0W	200.0W	400.0W / 200.0W — Higher power rating provides more robust protection.; SMF24A: Power rating matches the target.
Current	4.8A	8.8A	5.1A	8.8A / 5.1A — Higher peak current rating improves survivability.; SMF24A: Slightly higher peak current rating.

Application & sourcing insights

Questions & answers

TPSMF4L28A is a strong alternative, offering higher power (400W) and current (8.8A) ratings in the same package. Its 28V standoff voltage is slightly higher and should be verified for your application.