21. TVS Diode for USB Data Line ESD Protection

Every time a user plugs a USB cable, static discharge from their body can reach thousands of volts in nanoseconds. This ESD strike travels directly into the MCU’s USB data pins, which are rated for only ~4V absolute maximum.

A bidirectional TVS diode on each data line clamps ESD strikes to a safe voltage (~17V peak for nanosecond pulses — MCU pins can survive these brief transients). Critical: the TVS must have very low capacitance (≤5pF) to avoid distorting fast USB data signals.

Required: Bidirectional · Vstandoff 5–6.5V · Vclamp ≤17V · ≥40W · ≤5pF · SOD-882 · Littelfuse

Go to DigiKey.com → Circuit Protection → TVS - TVS Diodes

Apply these filters:

• Bidirectional Channels → 1
• Voltage - Reverse Standoff (Typ) → 5V to 6.5V range
• Voltage - Clamping (Max) → 17V or lower
• Capacitance → 5pF or lower
• Package / Case → SOD-882
• Manufacturer → Littelfuse Inc.
• Part Status → Active

Important: Capacitance is critical for USB. A TVS with 50pF capacitance would corrupt USB Full-Speed and Hi-Speed data. Always verify ≤5pF for data line TVS protection.

The filtered list will show matching parts. Before you pick one, check: Is it Active? Is stock available? Is the manufacturer reputable? Is a datasheet available?

Full checklist: How to Select a Safe, Production-Ready Component — EWskills Guide

➡ View Matching Parts — Littelfuse, Bidirectional TVS, 5–6.5V, ≤5pF, SOD-882