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Best Alternatives to SD103AX

Package: SOD-523TWGMCRectifiersDevice type: Small-signal Schottky barrier diodePeak repetitive reverse voltage (VRRM): 40 VMaximum average forward current (IF(AV)): 350 mAForward voltage: 0.37 V max at 20 mA; 0.60 V max at 200 mAMaximum peak reverse current: 5 uA max at VR=30 V

SD103AX is a popular 40V, 350mA Schottky diode in a compact SOD-523 package, used for fast switching and rectification. Several functional alternatives with similar or upgraded performance are available.

AI replacement insight

Electrical riskmedium

Some alternatives have higher reverse leakage. Always verify Vf/Ir curves.

Package risklow

SOD-523 is a standard package, but cathode marking must be confirmed.

Sourcing risklow

Multiple manufacturers produce suitable alternatives.

Can it be replaced directly?

Yes, several direct replacements exist for SD103AX. SD103AWT is a strong candidate with matching key specifications and package.

Best replacement path

For a direct replacement, consider SD103AWT or 1N5819WT. For higher current needs, review B1040X or MSK4010, but check reverse leakage.

Main risk

The main risk is assuming pin-compatibility without verifying the datasheet and differences in secondary electrical parameters like reverse leakage current and forward voltage curves.

Recommended alternatives

6
1N5819WT package
1N5819WT

Slkor(SLKORMICRO Elec.)

Needs validationlow risk

A strong alternative with matching package, voltage, current, and other key electricals.

View details

Alternative comparison matrix

Feature / factorSD103AX1N5819WTSD103AWTSD103AXCompatibility / risk
PackageSOD-523SOD-523SOD-523SOD-523SOD-523 — Same package and pin count.; SD103AWT: Same package and pin count.; SD103AX: Same package and pin count.; B1040X: Same package and pin count.
Voltage40V40V40V40V40V — Voltage rating is identical.; SD103AWT: Voltage rating is identical.; SD103AX: Voltage rating is identical.; B1040X: Voltage rating is identical.
Current350mA350mA350mA350mA350mA / 1.0A — Current rating is identical.; SD103AWT: Current rating is identical.; SD103AX: Current rating is identical.; B1040X: Higher current rating provides more margin.
Vf0.6V @ 200mA600mV @ 200mA0.6V @ 200mA0.6V @ 200mA600mV @ 200mA / 0.6V @ 200mA — Forward voltage is identical.; SD103AWT: Forward voltage is identical.; SD103AX: Forward voltage appears comparable.
Ir5µA @ 30V5uA @ 30V5µA @ 30V-5uA @ 30V / 5µA @ 30V / 40µA @ 40V — Reverse leakage is identical.; SD103AWT: Reverse leakage is identical.; B1040X: Higher reverse leakage current.

Application & sourcing insights

Questions & answers

SD103AWT and 1N5819WT are strong alternatives, offering the same 40V, 350mA rating and SOD-523 package with very similar electrical characteristics. Verification of detailed datasheet parameters is recommended.