Is there a pin-compatible replacement for US1JW?

Yes, several diodes like the onsemi US1MFA share the same SOD-123FL package and pinout. However, they are not drop-in replacements due to differences in electrical characteristics like recovery speed.

What risks should I check before replacing US1JW?

The main risk is using a slower diode. Check the reverse recovery time (Trr). A slower Trr (>50ns) will increase switching losses, potentially causing overheating and circuit failure in high-frequency applications. Also verify forward voltage (Vf).

US1JW Alternatives, Datasheet & Cross Reference | Slkor(SLKORMICRO Elec.)

Finding a substitute for the US1JW ultrafast rectifier requires matching its 600V, 1A rating, SOD-123FL package, and critically, its 50ns reverse recovery time. Alternatives must be carefully vetted for switching performance.

AI replacement insight

Electrical riskhigh

Mismatch in reverse recovery time (Trr) is critical for switching applications and can cause component failure.

Package risklow

The SOD-123FL package is common and candidates with the same footprint are available.

Can it be replaced directly?

No direct, drop-in replacement has been identified. Candidates like US1MFA are form-fit compatible but have weaker switching performance (slower Trr) that must be evaluated in the application.

Best replacement path

The best path is to find another 'ultrafast' rectifier with Trr ≤ 50ns. The onsemi US1MFA is a 'super fast' option but represents a performance downgrade.

Main risk

Increased switching losses and heat dissipation due to a slower reverse recovery time (Trr).

Recommended alternatives

A form-fit alternative with higher voltage but slower switching speed; requires performance validation.

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Alternative comparison matrix

Feature / factor	US1JW	US1MFA	US1008FL_R1_00001	Compatibility / risk
Package	SOD-123FL	SOD-123FL	SOD-123FL	SOD-123FL — Package matches.; US1008FL_R1_00001: Package matches.
Voltage	600V	1000V	800V	1000V / 800V — Higher voltage rating provides more margin.; US1008FL_R1_00001: Higher voltage rating provides more margin.
Current	1A	1A	-	1A — Current rating matches.
Reverse Recovery Time	50ns	75ns	100ns	75ns / 100ns — Slower recovery time will increase switching losses.; US1008FL_R1_00001: Significantly slower recovery time (2x) will increase switching losses.
Forward Voltage	1.3V	1.7V	1.7V	1.7V — Higher forward voltage increases conduction losses.; US1008FL_R1_00001: Higher forward voltage increases conduction losses.

Application & sourcing insights

Questions & answers

The onsemi US1MFA is a potential alternative in the same package with a higher voltage rating, but it has a slower recovery time (75ns) and higher forward voltage, requiring circuit performance review.