Is there a pin-compatible replacement for SMF6.5A?

Yes, parts like SMF6.0A-MS and KPTVS6V0S1UR are pin-compatible as they use the same SOD-123FL package. However, they are not electrically identical due to a lower standoff voltage, so they are not drop-in replacements without engineering review.

What risks should I check before replacing SMF6.5A?

Before replacing SMF6.5A, check three main risks: 1) Polarity: Ensure the replacement is unidirectional, not bidirectional ('CA' suffix). 2) Standoff Voltage (Vrwm): Ensure it's at least 6.5V or that a lower voltage is acceptable for your circuit. 3) Peak Pulse Current (Ipp): Ensure it's at least 17.9A.

SMF6.5A Alternatives, Datasheet & Cross Reference | Microdiode Semiconductor (Shenzhen) Co., Ltd.

The MDD SMF6.5A is a unidirectional 6.5V TVS diode in a SOD-123FL package. While no direct drop-in replacements are identified, several parametric alternatives exist with the same package but require careful electrical review.

AI replacement insight

Electrical riskhigh

Incorrect polarity (bidirectional vs. unidirectional) or lower standoff voltage can cause circuit failure.

Package risklow

Many alternatives exist in the same SOD-123FL package, ensuring mechanical compatibility.

Can it be replaced directly?

No direct, drop-in replacements with identical key parameters were found. Several alternatives are available in the same package, but they have a lower 6.0V standoff voltage, which requires careful review of your circuit's maximum operating voltage.

Best replacement path

Search for unidirectional TVS diodes in a SOD-123FL package with a standoff voltage (Vrwm) of 6.5V or slightly higher, and peak pulse current (Ipp) at or above 17.9A.

Main risk

The main risk is selecting an incorrect part type. Using a bidirectional diode (often marked 'CA') instead of the required unidirectional 'A' type will lead to circuit malfunction. Using a part with lower standoff voltage could cause unwanted clamping during normal operation.

Recommended alternatives

Form-fit compatible with higher current rating, but its lower standoff voltage requires engineering review.

View details

Alternative comparison matrix

Feature / factor	SMF6.5A	KPTVS6V0S1UR	SMF6.0A-MS	Compatibility / risk
Package	SOD-123FL	SOD-123FL	SOD-123FL	SOD-123FL — Mechanically compatible package.; SMF6.0A-MS: Mechanically compatible package.
Polarity	Unidirectional	Unidirectional	Unidirectional	Unidirectional — Polarity matches target (verified from datasheet).; SMF6.0A-MS: Polarity matches target.
Voltage	6.5V	6.0V	6.0V	6.0V — Lower standoff voltage requires circuit compatibility check.; SMF6.0A-MS: Lower standoff voltage requires circuit compatibility check.
Current	17.9A	19.4A	19.4A	19.4A — Higher peak pulse current offers more robust protection.; SMF6.0A-MS: Higher peak pulse current offers more robust protection.
Power	200W	200W	200W	200W — Peak pulse power matches.; SMF6.0A-MS: Peak pulse power matches.

Application & sourcing insights

Questions & answers

The best alternatives found are SMF6.0A-MS and KPTVS6V0S1UR. Both match the package and have a higher current rating, but feature a lower 6.0V standoff voltage. You must verify this is compatible with your circuit's maximum operating voltage before using them.