Is there a pin-compatible replacement for DSR1M?

A verified pin-compatible replacement is not available without datasheet review. 2CZ4007 is the most likely candidate for pin-compatibility because it is in the same SOD-123 package, but this must be confirmed by an engineer.

What risks should I check before replacing DSR1M?

Before replacing DSR1M, you must check three main risks: 1) Package compatibility, as many alternatives are in different packages like SOD-123FL or SMB. 2) Forward Voltage (Vf), as a higher value increases power loss. 3) Recovery Time (Trr), as replacing a standard diode with a fast one can alter circuit performance.

DSR1M Alternatives, Datasheet & Cross Reference | FUXINSEMI

Finding a substitute for the DSR1M, a 1000V 1A rectifier in a SOD-123 package, requires careful verification. While several parts offer similar electrical specs, confirming the package footprint and secondary parameters is critical for a successful replacement.

AI replacement insight

Package riskhigh

Multiple candidates have different or ambiguous packages (SOD-123FL, SMB) requiring layout changes or causing assembly failure.

Electrical riskmedium

Some candidates have higher forward voltage (Vf) or are fast-recovery types, which can affect efficiency and circuit behavior.

Can it be replaced directly?

No verified direct drop-in replacement has been identified. 2CZ4007 is a strong candidate for a form-fit replacement, but requires engineering review to confirm its pinout and secondary electrical characteristics from the datasheet.

Best replacement path

The most promising path is 2CZ4007, which matches the package and key ratings, but requires datasheet verification. For a guaranteed upgrade requiring a board change, STTH112U offers higher voltage.

Main risk

The primary risk is physical incompatibility due to package differences. Several candidates have ambiguous or different packages (SOD-123FL, SMB, SMC) that will not fit a SOD-123 footprint.

Recommended alternatives

A potential form-fit replacement in a SOD-123 package with matching 1000V/1A ratings; requires datasheet verification.

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Alternative comparison matrix

Feature / factor	DSR1M	2CZ4007	STTH112U	Compatibility / risk
Package	SOD-123	SOD-123	SMB	SOD-123 / SMB — Same package family, verify footprint dimensions.; STTH112U: Different package, not a drop-in replacement.
Voltage	1000V	1000V	1200V	1000V / 1200V — Identical voltage rating, no extra margin.; STTH112U: Higher voltage rating provides more margin.
Current	1A	1A	1A	1A — Identical current rating.; STTH112U: Identical current rating.
Vf	1.1V @ 1A	1.1V @ 1A	-	1.1V @ 1A — Forward voltage appears to match.
Type	Standard	-	Ultrafast	Ultrafast — Candidate is an ultrafast diode (Trr 75ns).

Application & sourcing insights

Questions & answers

The best potential alternative is 2CZ4007, as it shares the same SOD-123 package and 1000V/1A ratings. However, you must verify its datasheet to confirm full electrical and physical compatibility before use.