ESD Protection Design and PCB Layout for Imports
1 resources tagged with "Esd Protection"
ESD protection is engineered into a PCB through TVS diode placement at exposed connectors, short clamp-to-ground paths, and stack-up choices that follow IEC 61000-4-2 discharge levels (often ±4kV contact / ±8kV air for consumer products). The TVS selection matters: clamping voltage and capacitance must suit the protected line, and a too-slow or wrong-rated diode on a USB or HDMI data line will pass DC tests but fail at the EMC lab. When sourcing, you also confirm the factory line keeps the design's protection intact with real ESD handling controls.
ESD protection design covers the circuit-level measures (TVS diodes, grounding, layout) that let a product survive electrostatic discharge. The pitfall is approving a schematic without checking the actual PCB layout — a correctly chosen TVS placed far from the connector with a long ground trace loses most of its effectiveness.
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FAQ
Where should TVS diodes be placed on a PCB?
As close as possible to the exposed connector or port, with the shortest practical path to a solid ground plane. Placing the TVS deep in the board after long traces lets the discharge couple into the circuit before it's clamped.
How do I pick the right TVS diode for a data line?
Match the standoff voltage to the line's normal operating voltage, keep clamping voltage below the IC's damage threshold, and use low-capacitance parts on high-speed lines like USB or HDMI so signal integrity isn't degraded. Test the protected port to IEC 61000-4-2 levels on a sample.
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