Is there a pin-compatible replacement for PESD0402-140?

Yes, several pin-compatible replacements in the same 0402 package exist. For a 2-pin device like this, a matching package size implies pin compatibility. Candidates like Littelfuse's AXGD10402KR and PESD0402-240 are pin-compatible.

What risks should I check before replacing PESD0402-140?

Before replacing, verify two key parameters: the operating voltage must be 14V or higher, and the capacitance should be close to 0.25pF or lower. Using a part with lower voltage will cause failure, while higher capacitance can degrade high-speed signals.

PESD0402-140 Alternatives, Datasheet & Cross Reference | Littelfuse

PESD0402-140 is a 14V bi-directional TVS diode in an 0402 package for high-speed ESD protection. Key alternatives should match or exceed its 14V rating and have capacitance at or below 0.25pF.

AI replacement insight

Electrical risklow

Low if operating voltage and capacitance are correctly matched or improved.

Package risklow

The 0402 package is standard, ensuring form-fit compatibility.

Sourcing riskmedium

Availability of specific alternatives should be confirmed with distributors.

Can it be replaced directly?

Yes, several direct replacements are available. The best path is upgrading to AXGD10402KR for superior electrical characteristics and reliability.

Best replacement path

Upgrade to the Littelfuse AXGD10402KR for improved performance, including lower capacitance, higher ESD rating, and AEC-Q200 qualification.

Main risk

The main risk is selecting a part with a lower operating voltage (less than 14V), which would cause it to clamp during normal operation and fail.

Recommended alternatives

AEC-Q200 qualified upgrade with higher voltage, lower capacitance, and superior ESD protection.

View details

Alternative comparison matrix

Feature / factor	PESD0402-140	AXGD10402KR	PESD0402-240	LXES15AAA1-133	Compatibility / risk
Package	0402	0402	0402	0402	0402 — Same package ensures form and fit.; PESD0402-240: Same package ensures form and fit.; LXES15AAA1-133: Same package ensures form and fit.
Voltage	14 V	24 V	24 V	15 V	24 V / 15 V — Higher voltage rating provides more design margin.; PESD0402-240: Higher voltage rating provides more design margin.; LXES15AAA1-133: Slightly higher voltage is a near-perfect match.
Capacitance	0.25 pF	0.04 pF	0.25 pF	0.05 pF	0.04 pF / 0.25 pF / 0.05 pF — Ultra-low capacitance is a significant improvement.; PESD0402-240: Identical capacitance preserves signal integrity.; LXES15AAA1-133: Lower capacitance is an improvement for high-speed signals.
Esd Rating	15kV/8kV	30kV	-	15kV Air/Contact	30kV / 15kV Air/Contact — Superior ESD protection.; LXES15AAA1-133: Improved contact ESD rating.
Qualification	None	AEC-Q200	-	-	AEC-Q200 — Automotive qualification indicates higher reliability.
Temperature	-55°C to +125°C	-	-55°C to +125°C	-	-55°C to +125°C — Matching temperature range.

Application & sourcing insights

Questions & answers

The Littelfuse AXGD10402KR is an excellent upgrade, offering a higher 24V operating voltage, much lower 0.04pF capacitance, superior 30kV ESD protection, and AEC-Q200 qualification.