Is there a pin-compatible replacement for TUSD05FB?

Several parts like SD05C and PSD05C-ES share the same SOD-323 package and 2-pin layout, but are not electrically equivalent due to a large capacitance difference, which is critical for performance.

What risks should I check before replacing TUSD05FB?

Verify the capacitance, as the TUSD05FB is an ultra-low capacitance part (0.6pF). Also check clamping voltage and peak power rating (350W) to ensure adequate protection without affecting the circuit.

TUSD05FB Alternatives, Datasheet & Cross Reference | Leiditech

Finding a replacement for the Leiditech TUSD05FB TVS diode requires matching its 5V rating, SOD-323 package, and critically, its ultra-low 0.6pF capacitance for high-speed line protection.

AI replacement insight

Electrical riskhigh

Capacitance mismatch is critical and will likely cause signal integrity failure in high-speed circuits.

Package risklow

The SOD-323 package is common and candidates match the form factor.

Can it be replaced directly?

No direct drop-in replacement has been identified. Candidates match voltage and package but have significantly higher capacitance, making them unsuitable for the target's high-speed applications.

Best replacement path

Search for TVS diodes in a SOD-323 package with 5V working voltage and capacitance under 1pF.

Main risk

The primary risk is capacitance mismatch. Using a high-capacitance alternative on a high-speed data line will degrade signal integrity.

Recommended alternatives

Offers higher power handling but has much higher capacitance, making it a risk for high-speed applications.

View details

Alternative comparison matrix

Feature / factor	TUSD05FB	PSD05C-ES	SD05C	Compatibility / risk
Package	SOD-323	SOD-323	SOD-323	SOD-323 — Form factor matches.; SD05C: Form factor matches.
Voltage	5.0V	5.0V	5.0V	5.0V — Operating voltage matches.; SD05C: Operating voltage matches.
Capacitance	0.6pF	~100pF	~150pF	~100pF / ~150pF — Significantly higher than target's 0.6pF, not for high-speed lines.; SD05C: Significantly higher than target's 0.6pF, not for high-speed lines.
Power	350W	550W	300W	550W / 300W — Higher power rating is an upgrade.; SD05C: Slightly lower power rating.

Application & sourcing insights

Questions & answers

The best alternative must match the 5V rating, SOD-323 package, and ultra-low capacitance (<1pF). While parts like SD05C match voltage, their high capacitance makes them poor substitutes for high-speed applications.