Is there a pin-compatible replacement for US1DW?

Yes, several parts like US1MFA and US1JW use the same SOD-123FL package and are pin-compatible. However, their electrical characteristics, such as forward voltage (Vf) and recovery time (Trr), differ and must be verified for your application.

What risks should I check before replacing US1DW?

The main risks are increased power dissipation due to higher forward voltage (Vf) and slower switching performance from a longer reverse recovery time (Trr). These can affect efficiency and cause timing issues in high-frequency circuits.

US1DW Alternatives, Datasheet & Cross Reference | Slkor(SLKORMICRO Elec.)

Reviewing alternatives for the US1DW, a 200V, 1A ultrafast rectifier in a SOD-123FL package. Key considerations for substitutes include matching the 50ns reverse recovery time and low 1.0V forward voltage to maintain circuit efficiency and performance.

AI replacement insight

Electrical riskmedium

Higher Vf and slower Trr require circuit analysis.

Package risklow

All viable candidates use the same SOD-123FL package.

Sourcing risklow

Multiple vendors offer parts in this package and rating class.

Can it be replaced directly?

No direct, fully equivalent replacement was found. All candidates require a trade-off analysis, primarily on forward voltage and recovery speed.

Best replacement path

Upgrade voltage while carefully validating slower Trr and higher Vf.

Main risk

Increased power loss and thermal stress from higher forward voltage (Vf).

Recommended alternatives

Substitute in the same package with higher voltage, but has higher forward voltage and is slightly slower.

View details

Alternative comparison matrix

Feature / factor	US1DW	US1JW	US1MFA	Compatibility / risk
Package	SOD-123FL	SOD-123FL	SOD-123FL	SOD-123FL — Form factor matches.; US1MFA: Form factor matches.
Voltage	200V	600V	1000V	600V / 1000V — Higher voltage rating provides margin.; US1MFA: Higher voltage rating provides more margin.
Current	1A	1A	1A	1A — Average forward current matches.; US1MFA: Average forward current matches.
Forward Voltage	1.0V	1.25V	1.7V	1.25V / 1.7V — Higher Vf increases power loss.; US1MFA: Higher Vf increases power loss.
Recovery Time	50ns	75ns	75ns	75ns — Slower recovery may affect high-frequency performance.; US1MFA: Slower recovery may affect high-frequency performance.

Application & sourcing insights

Questions & answers

Finding a direct drop-in for US1DW is challenging. Candidates like onsemi's US1MFA offer higher voltage (1000V) but have a higher forward voltage and slightly slower recovery time, requiring engineering review.