Is there a pin-compatible replacement for ES1JL?

Yes, parts like US1MFA and US1JW are pin-compatible in the same SOD-123FL package. However, they are not identical electrically. You must verify that your circuit can tolerate a slower reverse recovery time (trr) of 75ns compared to the original's 35ns.

What risks should I check before replacing ES1JL?

The main risk is the slower switching speed (reverse recovery time, trr). The ES1JL is a 'super fast' diode (35ns), while most alternatives are slightly slower (75ns or more). In high-frequency power supplies or rectifiers, a slower diode can lead to increased power loss, higher temperatures, or circuit malfunction.

ES1JL Alternatives, Datasheet & Cross Reference | Taiwan Semiconductor Co., Ltd.

ES1JL is a 600V, 1A Super Fast Recovery Rectifier in a compact SOD-123FL package, designed for high-frequency applications. When seeking a replacement, it is critical to match its 35ns reverse recovery time to ensure circuit performance.

AI replacement insight

Electrical riskmedium

Candidate trr is 75ns vs target's 35ns. This may increase switching losses or cause timing issues in fast power circuits.

Package risklow

All strong candidates use the same SOD-123FL package, ensuring form and fit compatibility.

Sourcing risklow

Alternatives from major manufacturers like onsemi are readily available, potentially improving supply chain resilience.

Can it be replaced directly?

Yes, several pin-compatible alternatives exist, but none are exact drop-in replacements. The closest options, like US1MFA, have a slightly slower reverse recovery time (trr) which must be verified for the application.

Best replacement path

US1MFA from onsemi or US1JW from Slkor are the best functional alternatives. They match the package and primary ratings, with only a minor relaxation in switching speed.

Main risk

The primary risk is functional failure in high-frequency circuits due to a slower reverse recovery time (trr).

Recommended alternatives

A strong functional alternative with a higher voltage rating and AEC-Q101 qualification, but a slightly slower recovery time.

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Alternative comparison matrix

Feature / factor	ES1JL	US1MFA	US1JW	Compatibility / risk
Package	SOD-123FL	SOD-123FL	SOD-123FL	SOD-123FL — Package is physically compatible.; US1JW: Package is physically compatible.
Voltage	600V	1000V	600V	1000V / 600V — Candidate has higher voltage rating, offering more margin.; US1JW: Voltage rating matches.
Current	1A	1A	1A	1A — Average forward current matches.; US1JW: Average forward current matches.
Trr	35ns	75ns	75ns	75ns — Slower reverse recovery time. Verify circuit switching frequency.; US1JW: Slower reverse recovery time. Verify circuit switching frequency.
Vf	1.7V	1.7V	1.25V	1.7V / 1.25V — Maximum forward voltage matches.; US1JW: Lower forward voltage is more efficient.

Application & sourcing insights

Questions & answers

The best alternatives for ES1JL are US1MFA by onsemi and US1JW by Slkor. Both are in the same SOD-123FL package and have similar or better voltage/current ratings, but with a slightly slower recovery time (75ns vs 35ns).