USB2.0

When protecting USB 2.0, choose ultra-low capacitance ESD components (≤1pF) to avoid signal distortion on high-speed data lines.

Information

ESD Protection Guidelines for USB 2.0 D+ / D− Lines

1.Differential Signals Require Symmetrical Protection

  • D+ and D− form a high-speed differential pair. Using an ESD array (dual or multi-channel) ensures matched protection characteristics, preventing signal imbalance or offset.

2.Integrated Packaging Simplifies Layout

  • Array devices (e.g., SOT-23,SOT-143 ) combine multiple channels in a single package, saving PCB space and simplifying routing.

3.Matched Capacitance for Signal Integrity

  • Arrays are designed with tightly matched capacitance between channels—typically 0.5–1 pF—ideal for maintaining USB 2.0's 480 Mbps signal quality.

4.Compact Placement Near Connector

  • Small packages allow placement close to the USB connector, minimizing parasitic inductance and improving protection efficiency.oltage Vbus conditions.

SOT-883 vs SOT-23

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The SOT-23 package is commonly used for protecting USB 2.0 data lines (D+ and D−), but in space-constrained PCB designs, the SOT-883 package is more suitable and offers greater design flexibility for engineers.