Ars calculates the size of the DualShock 4 touchpad: about 2.1” x 1”

A little image wrangling (and math) generates a general sizing estimate.

DualShock 4 (CUH-ZCT1U) Touch Pad Replacement - iFixit Repair Guide

Nintendo Switch - Wikipedia

Perfect for PS4 controller, best replacement for a damaged or broken one. Made of high quality ABS material, wear-resistant and durable. Exquisite

PS4 Controller Touchpad Replacement for Sony PS4 Game Controller Replacement Touch Pad

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GCDualShockGamepad Apple Developer Documentation

DualShock 4 CHU-ZCT2U Touchpad Replacement - iFixit Repair Guide

ISO 9241-9 Evaluation of Video Game Controllers - Department of

eXtremeRate Replacement D-pad R1 L1 R2 L2 Triggers Touchpad Action Home Share Options Buttons for ps4 Controller, Chrome Gold Full Set Buttons Repair Kit for ps4 Slim Pro CUH-ZCT2 Controller – eXtremeRate

Precision Control: The feel, shape, and sensitivity of the DualShock 4 s analog sticks and trigger buttons have been enhanced to offer players

DualShock 4 - White