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.

Controller Touchpad Board for Sony Playstation 4 Dualshock 4 Replacement Part

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PS4 Controller Touchpad

Game Controller Repairing Touch Pad Accessory, Wearable and Durable Replacement Touchpad for PS4 Gamepad : Video Games

PlayStation Controller Dimensions & Drawings

Powkiddy X28 Handheld Game Player Android 11 T618 5.5 Inch Touch IPS Screen Handheld Retro Game Console Gift Free Shipping - AliExpress

JCD Joystick Controller Touchpad Board For PS4 Slim Pro 4.0 5.0 CUH-1000/1100 JDM-030 JDS-040 Gamepad Touch Pad W/ Flex Cable - AliExpress

Use Touchpad of DS4 controller as a button (PC) : r/RocketLeague

DUALSHOCK 4 Battery and Touch Pad Replacement

We know that your controller button is more than just a plastic accessory., It is your sidekick, your wing man, your battle buddy., This is why we use

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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