What risks should I check before replacing LY323DC05UL?

Before replacing, verify the reverse working voltage (must be 5V), package (SOD-323), and polarity (bi-directional). Critically, check the junction capacitance; a higher value can degrade high-speed signals. Also confirm the peak power rating is equal or greater.

LY323DC05UL Alternatives, Datasheet & Cross Reference | Liown Semiconductor Co., Ltd

Finding a substitute for the LY323DC05UL TVS diode involves matching its 5V working voltage, SOD-323 package, and low capacitance. Several alternatives exist, with TUSD05FB being a strong candidate offering improved protection.

AI replacement insight

Electrical risklow

Key parameters like voltage and power are matched or improved by the best candidates. Capacitance must be checked.

Package risklow

All candidates share the common SOD-323 package, but land pattern verification is still a good practice.

Sourcing riskhigh

Alternatives are from different manufacturers; availability and supply chain should be verified for your region.

Can it be replaced directly?

Direct replacement for LY323DC05UL should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

TUSD05FB by Leiditech is the most promising alternative, offering a strong parametric match and potential improvements in power handling and capacitance.

Main risk

The primary risk when substituting TVS diodes is a mismatch in capacitance, which can affect high-speed signal integrity. Several candidates were rejected for incorrect voltage.

Recommended alternatives

A strong alternative with matching voltage and package, plus higher power rating and lower capacitance.

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Alternative comparison matrix

Feature / factor	LY323DC05UL	TUSD05FB	SD05C	Compatibility / risk
Package	SOD-323	SOD-323	SOD-323	SOD-323 — Package matches, enabling form-fit compatibility.; SD05C: Package matches, enabling form-fit compatibility.
Voltage	5.0 V	5.0 V	5.0 V	5.0 V — Reverse working voltage matches target.; SD05C: Reverse working voltage matches target.
Power	300 W	350 W	300W - 350W	350 W / 300W - 350W — Higher peak pulse power offers more robust protection.; SD05C: Peak pulse power is equivalent or better.
Capacitance	1 pF	0.6 pF	35-70 pF	0.6 pF / 35-70 pF — Lower capacitance is better for high-speed signal integrity.; SD05C: Significantly higher capacitance may degrade high-speed signals.
Clamping Voltage	20 V	20 V	-	20 V — Clamping voltage matches the target specification.

Application & sourcing insights

Questions & answers

Verified drop-in options for LY323DC05UL 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.