ProjectsPricingInsights

Best Alternatives to US1A

Package: SMADiotec SemiconductorRectifiersMfr: Diotec SemiconductorSeries: -Package: Tape & Reel (TR)Diode Type: StandardVoltage - DC Reverse (Vr) (Max): 50 V

US1A is a 50V, 1A fast recovery diode in a common SMA package, used in high-frequency power applications. Finding a substitute requires matching the 50ns recovery time and low forward voltage.

AI replacement insight

Electrical riskhigh

Mismatched reverse recovery time (trr) or forward voltage (Vf) is common and critical for performance.

Package risklow

The DO-214AC (SMA) package is standard, but verifying datasheet dimensions is always recommended.

Sourcing risklow

Many manufacturers produce similar fast recovery diodes in SMA packages.

Can it be replaced directly?

Direct replacement for US1A should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

HS1D is the most promising path, offering an upgrade in voltage with no parametric compromises on key specs like trr and Vf.

Main risk

The primary risk is substituting with a diode that has a slower reverse recovery time (trr) or higher forward voltage (Vf), impacting efficiency and performance.

Recommended alternatives

4
HS1D package
HS1D

Yangjie Technology

Needs validationlow risk

A pin-compatible fast recovery diode with a higher 200V rating, matching current and recovery time.

View details

Alternative comparison matrix

Feature / factorUS1AHS1DUS2DUS1JCompatibility / risk
PackageDO-214AC (SMA)DO-214AC (SMA)DO-214AC (SMA)DO-214AC (SMA)DO-214AC (SMA) — Package matches target.; US2D: Package matches target.; US1J: Package matches target.; US1M: Package matches target.
Voltage50V200V200V600V200V / 600V / 1000V — Higher voltage rating provides more margin.; US2D: Higher voltage rating provides more margin.; US1J: Significantly higher voltage rating.; US1M: Significantly higher voltage rating.
Current1A1A2A-1A / 2A — Current rating matches.; US2D: Higher current rating.
Trr50ns50ns~75ns75ns50ns / ~75ns — Reverse recovery time matches.; US2D: Slower recovery time, requires verification.; US1J: Slower recovery time requires verification.; US1M: Slower recovery time requires verification.
Vf1.0V @ 1.0A1V @ 1A-1.7V @ 1A1V @ 1A / 1.7V @ 1A — Forward voltage matches.; US1J: Higher forward voltage increases power loss.; US1M: Higher forward voltage increases power loss.

Application & sourcing insights

Questions & answers

Verified drop-in options for US1A are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.