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Best Alternatives to ES1BL

Package: SOD-123FLTaiwan Semiconductor Co., Ltd.Diodes - Rectifiers - SingleRepetitive Peak Reverse Voltage (VRRM): 100 VAverage Forward Current (IF(AV)): 1 APeak Forward Voltage (VF): 0.95 VMaximum Reverse Recovery Time (trr): 35 nsPeak Reverse Current (IRRM): 5 µA

Explore alternatives for the ES1BL, a 100V, 1A Super Fast Recovery Diode in a SOD-123FL package. This guide analyzes top candidates, highlighting critical parameters like recovery time and forward voltage to ensure a reliable substitution.

AI replacement insight

Electrical riskhigh

Using a standard diode or one with high Vf will likely cause circuit failure or overheating.

Package risklow

The SOD-123FL package is common, and many candidates match the form factor.

Can it be replaced directly?

No direct drop-in replacement has been identified. US1DW is a strong functional alternative, but has slightly higher forward voltage (1.0V vs 0.95V) and slower recovery time (50ns vs 35ns) that must be verified.

Best replacement path

US1DW is the most promising alternative, offering a similar electrical profile in the same package. Engineers must validate its performance, especially the slightly slower recovery time and higher forward voltage.

Main risk

The primary risk when replacing ES1BL is functional incompatibility due to mismatched reverse recovery time (trr) or excessive power dissipation from a higher forward voltage (Vf).

Recommended alternatives

5
US1DW package
US1DW

Slkor(SLKORMICRO Elec.)

Needs validationlow risk

A strong alternative with a higher voltage rating and very similar electrical characteristics in the same package.

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Alternative comparison matrix

Feature / factorES1BLUS1DWUS1JWES1JLCompatibility / risk
PackageSOD-123FLSOD-123FLSOD-123FLSOD-123FLSOD-123FL — Package matches, enabling form-fit compatibility.; US1JW: Package matches, enabling form-fit compatibility.; ES1JL: Package matches, enabling form-fit compatibility.; FFM107-M: Package matches, enabling form-fit compatibility.
Voltage100V200V600V600V200V / 600V / 1000V — Higher voltage rating provides a good safety margin.; US1JW: Voltage rating is significantly higher, providing a large safety margin.; ES1JL: Voltage rating is significantly higher, providing a large safety margin.; FFM107-M: Voltage rating is significantly higher, providing a large safety margin.
Current1A1A--1A — Forward current rating matches.; FFM107-M: Forward current rating matches.
Forward Voltage0.95V1.0V1.25V1.7V1.0V / 1.25V / 1.7V / 1.3V — Slightly higher forward voltage; likely acceptable.; US1JW: Higher forward voltage increases power loss and heat.; ES1JL: Significantly higher forward voltage will nearly double power dissipation.; FFM107-M: Higher forward voltage increases power loss and heat.
Recovery Time35ns50ns75ns35ns50ns / 75ns / 35ns / 500ns — Slightly slower recovery time; likely acceptable in many circuits.; US1JW: Slower recovery time may be unsuitable for some applications.; ES1JL: Reverse recovery time matches the target.; FFM107-M: Significantly slower recovery time (Fast vs Super Fast); may not work in high-frequency circuits.

Application & sourcing insights

Questions & answers

The best alternative identified is US1DW. It has a matching package, 1A current rating, and a higher 200V voltage rating. Its forward voltage (1.0V) and recovery time (50ns) are slightly higher but very close to the ES1BL's 0.95V and 35ns, making it a strong candidate that requires final validation.