Is there a pin-compatible replacement for RS1MF?

Yes, RS3MF is a strong pin-compatible candidate in the same SMAF package. Other parts like S2MF/S3MF are physically compatible but not functionally equivalent due to their slower recovery time.

What risks should I check before replacing RS1MF?

The main risk is accidentally using a standard (slow) rectifier instead of a fast recovery one, which can cause overheating and failure in switching power supplies. Always verify the reverse recovery time (trr) is 500ns or faster.

RS1MF Alternatives, Datasheet & Cross Reference | MDD(Microdiode Semiconductor)

RS1MF is a 1000V, 1A fast recovery rectifier in a compact SMAF package. When seeking alternatives, it is critical to match the fast recovery time (trr ≤ 500ns) for high-frequency applications.

AI replacement insight

Electrical riskhigh

Using a slow, standard rectifier instead of a fast one will cause excessive heat and likely failure in switching circuits.

Package risklow

Multiple candidates are available in the same SMAF package, ensuring physical compatibility.

Can it be replaced directly?

Yes, RS3MF from ZHIDE is a strong candidate for replacing RS1MF, offering improved current handling while matching all critical parameters.

Best replacement path

RS3MF is an excellent upgrade path, offering higher current (3A) in the same package with identical voltage and recovery speed.

Main risk

Using a standard recovery diode (like S2MF/S3MF) instead of a fast recovery one can cause circuit failure in switching applications.

Recommended alternatives

RS3MF is a strong upgrade with higher current (3A vs 1A) in the same package and matching fast recovery time.

View details

Alternative comparison matrix

Feature / factor	RS1MF	RS3MF	S3MF	Compatibility / risk
Package	SMAF	SMAF	SMAF	SMAF — Same form and fit.; S3MF: Same form and fit.
Voltage	1.3V	1.3V	1000V	1.3V / 1000V — Forward voltage matches.; S3MF: Reverse voltage matches.
Current	1A	3A	3A	3A — Higher current capability.; S3MF: Higher current capability.
Application	500ns	500ns	Standard Recovery	500ns / Standard Recovery — Fast recovery time matches.; S3MF: Much slower than target's Fast Recovery.

Application & sourcing insights

Questions & answers

The best alternative identified is RS3MF. It is a fast recovery rectifier with a higher current rating (3A vs 1A) in the same SMAF package, making it a robust upgrade.