Is there a pin-compatible replacement for US1G?

ES3JA uses the same DO-214AC/SMA package and is pin-compatible. However, due to a slight difference in forward voltage, it's best to review its impact on power dissipation before considering it a direct drop-in replacement.

What risks should I check before replacing US1G?

The main risk is using a standard recovery diode instead of an ultra-fast one. Check the reverse recovery time (trr); it must be close to the target's 50ns. Also, verify the forward voltage (Vf) to avoid overheating and efficiency loss.

US1G Alternatives, Datasheet & Cross Reference | MDD(Microdiode Semiconductor)

US1G is a 400V, 1A ultra-fast rectifier in a DO-214AC/SMA package. Finding a replacement requires matching the 50ns reverse recovery time (trr) for high-frequency applications.

AI replacement insight

Electrical riskmedium

Forward voltage (Vf) and recovery time (trr) must be carefully matched.

Package risklow

The DO-214AC/SMA package is common and well-defined.

Sourcing risklow

Multiple vendors produce similar fast-recovery diodes in this package.

Can it be replaced directly?

No verified direct drop-in replacement exists. ES3JA is a strong candidate requiring minor engineering review of its forward voltage characteristic.

Best replacement path

ES3JA offers upgraded electrical ratings in the same package, making it the most promising path. Verify thermal performance due to slightly higher Vf.

Main risk

Substituting with a slow, standard-recovery diode (like S1G/S1J) will cause circuit failure in high-frequency applications.

Recommended alternatives

Strong alternative with upgraded voltage, current, and speed in the same package. Review forward voltage.

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Alternative comparison matrix

Feature / factor	US1G	ES3JA	ES2MA	Compatibility / risk
Package	DO-214AC/SMA	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA) — Form and fit match.; ES2MA: Form and fit match.
Voltage	400V	600V	1000V	600V / 1000V — Higher voltage rating provides more margin.; ES2MA: Higher voltage rating.
Current	1A	3A	2A	3A / 2A — Higher current rating.; ES2MA: Higher current rating.
Speed	50ns	35ns	35ns	35ns — Faster recovery time is an upgrade.; ES2MA: Faster recovery time.
Forward Voltage	1.3V @ 1A	1.7V @ 3A	3.2V @ 2A	1.7V @ 3A / 3.2V @ 2A — Slightly higher Vf, review thermal impact.; ES2MA: Significantly higher Vf will increase power loss.

Application & sourcing insights

Questions & answers

ES3JA is a strong alternative with higher voltage (600V) and current (3A) ratings and a faster recovery time (35ns). Its forward voltage is slightly higher, which should be checked for thermal impact.