Is there a pin-compatible replacement for US1MW?

Several diodes like RS1ML and FR107 exist in the same SOD-123FL package, making them physically compatible. However, they are functionally different with much slower recovery times and are not pin-to-pin functional replacements for high-frequency circuits.

What risks should I check before replacing US1MW?

The most critical risk is the reverse recovery time (Trr). Replacing the 75ns US1MW with a slower diode will cause increased switching losses, overheating, and potential circuit failure in high-frequency designs. Always verify Trr is less than or equal to 75ns.

US1MW Alternatives, Datasheet & Cross Reference | Shenzhen SLKOR Micro Semicon Co., Ltd.

US1MW is a 1000V, 1A ultra-fast rectifier in a SOD-123FL package, used in high-efficiency power applications. Finding a substitute requires matching its fast 75ns reverse recovery time.

AI replacement insight

Electrical riskhigh

Using a slower diode will cause excessive switching losses, heat, and potential circuit failure.

Package risklow

The SOD-123FL package is common and several candidates match the form factor.

Sourcing riskmedium

Ultra-fast diodes with these ratings are more specialized than common fast or standard recovery types.

Can it be replaced directly?

No direct drop-in replacement was found. All reviewed candidates have a significantly slower reverse recovery time, which is a critical functional mismatch.

Best replacement path

Search for ultra-fast rectifiers with VRRM ≥ 1000V, IF(AV) ≥ 1A, Trr ≤ 75ns in a SOD-123FL package from other manufacturers.

Main risk

Functional mismatch due to slower reverse recovery time (Trr).

Recommended alternatives

A 1000V 1A diode in the same package, but with a much slower recovery time (500ns vs 75ns).

View details

Alternative comparison matrix

Feature / factor	US1MW	FR107 F7	RS1ML	Compatibility / risk
Package	SOD-123FL	SOD-123FL	SOD-123FL	SOD-123FL — Package is physically compatible.; RS1ML: Package is physically compatible.
Voltage	1000V	1000V	1000V	1000V — Voltage rating is sufficient.; RS1ML: Voltage rating is sufficient.
Current	1A	1A	1A	1A — Current rating is sufficient.; RS1ML: Current rating is sufficient.
Trr	75ns	500ns	500ns	500ns — Much slower recovery time; high risk of switching loss.; RS1ML: Much slower recovery time; high risk of switching loss.

Application & sourcing insights

Questions & answers

Finding a direct, verified replacement for US1MW requires an ultra-fast rectifier with 1000V, 1A ratings and a reverse recovery time (Trr) of 75ns or less in a SOD-123FL package. No direct drop-in matches have been confirmed among common parts.