# PGA2350 USB PCB trace impedance

**URL:** <https://forums.pimoroni.com/t/pga2350-usb-pcb-trace-impedance/27387>\
**Category:** Support\
**Created:** [February 27, 2025, 1:58pm UTC](https://forums.pimoroni.com/t/pga2350-usb-pcb-trace-impedance/27387 "2025-02-27T13:58:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![NewMaker](https://avatars.discourse-cdn.com/v4/letter/n/f19dbf/32.png) [@NewMaker](https://forums.pimoroni.com/u/NewMaker)\
**Post date:** [February 27, 2025, 1:58pm UTC](https://forums.pimoroni.com/t/pga2350-usb-pcb-trace-impedance/27387/1 "2025-02-27T13:58:36Z")

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Hi,

The PGA2350 as two 27ohms resistors for the USB signal.  
I assume a 54 ohms in impedance.  
Should the PCB trace match this impedance?

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<div class="post-metadata">

**Author:** ![NewMaker](https://avatars.discourse-cdn.com/v4/letter/n/f19dbf/32.png) [@NewMaker](https://forums.pimoroni.com/u/NewMaker)\
**Post date:** [February 27, 2025, 2:49pm UTC](https://forums.pimoroni.com/t/pga2350-usb-pcb-trace-impedance/27387/2 "2025-02-27T14:49:49Z")

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Finally, I found the requirement from RP2350 hardware document.