Is there a pin-compatible replacement for TUSD03FBX?

Yes, several parts share the same SOD-323 package and 2-pin layout, making them physically compatible. WS03DLC-B is a strong candidate for pin-compatibility, but you must always verify electrical parameters like power rating and capacitance for your specific application.

What risks should I check before replacing TUSD03FBX?

When replacing TUSD03FBX, verify three key parameters: 1) Working Voltage must be 3.3V. 2) Peak Pulse Power should be at least 350W. 3) Capacitance should be around 1.0pF to avoid degrading high-speed signals. Using a part with the wrong voltage or lower power rating can lead to circuit failure.

TUSD03FBX Alternatives, Datasheet & Cross Reference | Slkor(SLKORMICRO Elec.)

TUSD03FBX is a 3.3V bi-directional TVS diode in a SOD-323 package for ESD protection. When searching for alternatives, key parameters are the 3.3V working voltage, 350W power rating, and low capacitance (~1.0pF).

AI replacement insight

Electrical riskhigh

Mismatched voltage, power, or capacitance can lead to circuit failure or poor performance.

Package risklow

SOD-323 is a standard package, so physical compatibility is high among candidates.

Can it be replaced directly?

While no drop-in replacement is guaranteed without testing, WS03DLC-B is a pin-compatible upgrade path. Other parts like WS03DLC-B-ES exist but have lower power ratings, posing a risk.

Best replacement path

WS03DLC-B by Leiditech is a strong candidate, offering a higher power rating and better clamping voltage in the same package.

Main risk

The main risk is selecting a part with incorrect voltage, insufficient power rating, or high capacitance which can damage the circuit or degrade signal integrity.

Recommended alternatives

A form-fit alternate with a higher power rating and improved clamping voltage for better protection.

View details

Alternative comparison matrix

Feature / factor	TUSD03FBX	WS03DLC-B	WS03DLC-B-ES	Compatibility / risk
Package	SOD-323	SOD-323	SOD-323	SOD-323 — Same package ensures form and fit compatibility.; WS03DLC-B-ES: Same package ensures form and fit compatibility.
Voltage	3.3V	3.3V	3.3V	3.3V — Working voltage matches the target's requirement.; WS03DLC-B-ES: Working voltage matches the target's requirement.
Power	350W	400W	200W	400W / 200W — Higher peak pulse power provides more robust protection.; WS03DLC-B-ES: Lower peak pulse power offers less protection.
Capacitance	1.0pF	1.0pF	1.2pF	1.0pF / 1.2pF — Low capacitance matches target, suitable for high-speed lines.; WS03DLC-B-ES: Slightly higher capacitance may affect high-speed signals.
Clamping Voltage	9V @ 1A	5V @ 1A	-	5V @ 1A — Lower clamping voltage offers superior protection.

Application & sourcing insights

Questions & answers

WS03DLC-B from Leiditech is a strong alternative. It matches the package, 3.3V working voltage, and 1.0pF capacitance, while offering a higher power rating (400W vs 350W) and better clamping performance for enhanced protection.