Is there a pin-compatible replacement for ES1M?

Several diodes like US2M and RS1M use the same SMA (DO-214AC) package, making them mechanically pin-compatible. However, their electrical characteristics, especially switching speed, differ significantly and require careful engineering review before substitution.

What risks should I check before replacing ES1M?

The main risk is using a diode with a slower reverse recovery time (trr). The ES1M is a 'superfast' 35ns diode. Replacing it with a standard or even a 'fast' (150-500ns) diode in a high-frequency application can cause overheating, reduced efficiency, and circuit malfunction.

ES1M Alternatives, Datasheet & Cross Reference | GOODWORK

ES1M is a 1A, 1000V superfast recovery rectifier in a compact SMA package, ideal for high-frequency power conversion. Finding a substitute requires careful matching of its critical 35ns reverse recovery time to ensure circuit performance and reliability.

AI replacement insight

Electrical riskhigh

Mismatch in reverse recovery time (trr) is the main electrical risk.

Package risklow

The SMA (DO-214AC) package is standard, and many candidates offer a direct physical fit.

Can it be replaced directly?

There is no drop-in replacement identified. US2M is a strong functional alternative but requires engineering review due to a slower switching speed (75ns vs 35ns).

Best replacement path

Prioritize 'ultrafast' or 'superfast' rectifiers in an SMA package. The US2M is a good starting point, but verify its 75ns trr is acceptable for your application's switching frequency.

Main risk

The primary risk is substituting with a slower diode. The target's 35ns reverse recovery time (trr) is critical for high-frequency applications, and a slower part can cause overheating, inefficiency, and circuit failure.

Recommended alternatives

A strong functional alternative with a higher current rating, but a slightly slower reverse recovery time.

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Alternative comparison matrix

Feature / factor	ES1M	US2M	RS1M	Compatibility / risk
Package	SMA (DO-214AC)	DO-214AC (SMA)	SMA (DO-214AC)	DO-214AC (SMA) / SMA (DO-214AC) — Package matches, ensuring form and fit.; RS1M: Package matches, ensuring form and fit.
Voltage	1000V	1000V	1000V	1000V — Voltage rating matches.; RS1M: Voltage rating matches.
Current	1A	2A	1A	2A / 1A — Higher current rating provides more margin.; RS1M: Current rating matches.
Diode Type	35ns (trr)	75ns	500ns	75ns / 500ns — Candidate is 'Ultrafast', slower than target's 'Superfast' 35ns. Verification required.; RS1M: Candidate is a 'Fast' rectifier, target is 'Superfast'. Significant performance downgrade.

Application & sourcing insights

Questions & answers

The US2M is a potential functional alternative. It offers a higher current rating (2A) but has a slower reverse recovery time (75ns vs 35ns) that must be evaluated for your specific circuit.