Understanding D2 Functionality

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chien94

Please explain what @D2 does.

flux

D2 is a dual-channel transient-voltage-suppressor (TVS) diode (Würth Elektronik WE-TVS-82400102) placed across the USB data lines to protect against ESD and surge events. Key details:

Table

FeatureSpecification
FunctionESD/surge protection for USB D+ and D– lines
Topology2 channels + common cathode (2 + 1)
Clamping Voltage (typ.)7.7 V at 1 A (Transmission Line Pulsing)
Peak Pulse Current (8/20 µs)6 A
PackageSOT-23-6L
Operating Temperature–55 °C to +125 °C
ComplianceIEC 61000-4-2, ‑4, and ‑5
DatasheetDatasheet (PDF)
By clamping any fast voltage spikes on USB1’s DP and DN nets to ground, this part safeguards the CH340C USB interface and downstream circuitry against electrostatic discharge and other transient overvoltages.
Add TVS diode
Enforce placement
Assign net class
Extract footprint dims
Add series resistor
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WiFi Camera Reference Design