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Best Alternatives to 1N5819WT

Package: SOD-523Shenzhen SLKOR Micro Semicon Co., Ltd.RectifiersDiode Type: Schottky barrier rectifierPeak Repetitive Reverse Voltage: 40 VAverage Forward Rectified Current: 350 mAForward Voltage: 0.37 V max at 20 mA; 0.6 V max at 200 mAPeak Forward Surge Current: 2 A at 8.3 ms

1N5819WT is a 40V, 350mA Schottky diode in a compact SOD-523 package. This page reviews potential replacements, including pin-compatible options and functional alternatives that may require board changes.

AI replacement insight

Electrical risklow

Many alternatives match or exceed key voltage and current ratings.

Package riskhigh

Many functional alternatives are in much larger packages (SMA, SMB) that require a new PCB layout.

Sourcing risklow

The target and its primary alternative are widely available from multiple vendors.

Can it be replaced directly?

Direct replacement for 1N5819WT should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

The most direct path is using B5819WT from a reputable manufacturer after datasheet verification. For higher power needs, functional alternatives exist but require a new PCB layout.

Main risk

The primary risk is selecting an alternative with a different physical package, which would not be a drop-in replacement and requires a board redesign.

Recommended alternatives

2
B5819WT package
B5819WT

FUXINSEMI

Needs validationlow risk

A likely pin-compatible replacement in the same SOD-523 package with matching electrical ratings.

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Alternative comparison matrix

Feature / factor1N5819WTB5819WTUMW SS34BAlt 3Compatibility / risk
PackageSOD-523SOD-523-SMB (DO-214AA) — Package is significantly larger and requires board redesign.
Voltage40V40V-40V — Voltage rating matches.
Current0.35A0.35A-3.0A — Current rating is significantly higher, offering more margin.
Power0.15W0.15W - 0.2W-0.15W - 0.2W — Power dissipation is equivalent or slightly better.

Application & sourcing insights

Questions & answers

Verified drop-in options for 1N5819WT 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.