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Best Alternatives to 1N4001WS

Package: SOD-323Microdiode Semiconductor (Shenzhen) Co., Ltd.DiodesReverse Voltage (VRM): 120 VAverage Rectified Current (IO): 150 mAForward Voltage (VF): 1.25 V @ 150 mAReverse Recovery Time (trr): 4 nsPeak Forward Surge Current: 2 A (1us)

Finding a substitute for the 1N4001WS fast recovery diode requires careful attention to its 4ns reverse recovery time. While many diodes match its SOD-323 package and exceed its voltage/current ratings, most are significantly slower, posing a risk in high-frequency applications.

AI replacement insight

Electrical riskhigh

Significant mismatch in reverse recovery time (trr) can impact circuit timing and efficiency.

Package risklow

All viable candidates use the same SOD-323 package.

Can it be replaced directly?

No direct drop-in replacement is identified. All candidates require careful review of their slower reverse recovery time (35-50ns) compared to the target's 4ns.

Best replacement path

Parametric alternatives with higher voltage/current but slower switching speed, such as ES1JLWS or onsemi's BAS2xH series.

Main risk

Slower switching speed (reverse recovery time).

Recommended alternatives

4
ES1JLWS package
ES1JLWS

Jingdao Microelectronics

Needs validationhigh risk

A robust diode with much higher voltage/current, but slower switching speed. Check application frequency requirements.

View details

Alternative comparison matrix

Feature / factor1N4001WSES1JLWSBAS20HT1GBAS21HCompatibility / risk
PackageSOD-323SOD-323SOD-323SOD-323SOD-323 — Same package ensures form-fit compatibility.; BAS20HT1G: Same package ensures form-fit compatibility.; BAS21H: Same package ensures form-fit compatibility.; BAS21HT1G: Same package ensures form-fit compatibility.
Voltage120V600V200V250V600V / 200V / 250V — Significantly higher voltage rating.; BAS20HT1G: Higher voltage rating provides more design margin.; BAS21H: Higher voltage rating provides more design margin.; BAS21HT1G: Higher voltage rating provides more design margin.
Current150mA500mA200mA200mA500mA / 200mA — Significantly higher current rating.; BAS20HT1G: Higher current rating.; BAS21H: Higher current rating.; BAS21HT1G: Higher current rating.
Trr4ns35ns50ns50ns35ns / 50ns — Slower switching speed. Verification is critical.; BAS20HT1G: Significantly slower switching speed. Critical to verify.; BAS21H: Significantly slower switching speed. Critical to verify.; BAS21HT1G: Significantly slower switching speed. Critical to verify.
ApplicationN/A---AEC-Q101 — Automotive qualification may be beneficial.

Application & sourcing insights

Questions & answers

There is no single best alternative. Candidates like ES1JLWS or BAS21HT1G offer higher voltage/current in the same package but have slower switching speeds (35-50ns vs 4ns). The best choice depends on your circuit's tolerance for slower recovery time.