Is there a pin-compatible replacement for WPE3V3D3ULA?

While parts like PSD03C and ES3.3D1HA03 share the same SOD-323 package and pinout, they are not functionally pin-compatible for high-speed circuits due to a massive difference in junction capacitance.

What risks should I check before replacing WPE3V3D3ULA?

The most critical risk is the junction capacitance; the target's 1pF is for high-speed signals. Using a substitute with higher capacitance (e.g., 50pF) will likely degrade or corrupt data. Also, verify peak pulse power (Ppp) and clamping voltage (Vc) meet your circuit's protection needs.

WPE3V3D3ULA Alternatives, Datasheet & Cross Reference | WPMtek(Wei Pan Microelectronics)

Finding a substitute for the WPE3V3D3ULA TVS diode requires careful attention to its low 1pF capacitance, crucial for high-speed data line protection. While several parts match the SOD-323 package and 3.3V rating, their much higher capacitance makes them poor fits for the intended application.

AI replacement insight

Electrical riskhigh

High capacitance of substitutes will corrupt high-speed signals.

Package risklow

Candidates share the same SOD-323 package.

Can it be replaced directly?

No direct drop-in replacement was found. All reviewed candidates have significantly higher capacitance, which is a critical parameter for this part and makes them unsuitable for the intended high-speed applications.

Best replacement path

A new search focusing on bi-directional, 3.3V TVS diodes in a SOD-323 package with a junction capacitance under 5pF is the recommended path to find a suitable alternative.

Main risk

Signal integrity degradation due to using a substitute with high junction capacitance on a high-speed data line.

Recommended alternatives

Matches package and voltage but has much higher capacitance, making it unsuitable for high-speed applications.

View details

Alternative comparison matrix

Feature / factor	WPE3V3D3ULA	PSD03C	ES3.3D1HA03	Compatibility / risk
Package	SOD-323	SOD-323	SOD-323	SOD-323 — Form factor matches.; ES3.3D1HA03: Form factor matches.
Polarity	Bi-directional	Bi-directional	Bidirectional	Bi-directional / Bidirectional — Polarity matches.; ES3.3D1HA03: Polarity matches.
Voltage	3.3V	3.3V	3.3V	3.3V — Reverse working voltage matches.; ES3.3D1HA03: Reverse working voltage matches.
Capacitance	1pF	50pF	50pF	50pF — Significantly higher capacitance, not suitable for high-speed lines.; ES3.3D1HA03: Significantly higher capacitance, not suitable for high-speed lines.
Power	360W	450W	350W	450W / 350W — Higher peak pulse power is acceptable.; ES3.3D1HA03: Slightly lower peak pulse power requires review.

Application & sourcing insights

Questions & answers

No ideal alternative was found. Candidates like PSD03C match voltage and package but have much higher capacitance (50pF vs 1pF), making them unsuitable for the target's high-speed applications. A new search for low-capacitance TVS diodes is recommended.