14 Parameter Measurement Information

14.1 On-Resistance

The on-resistance of a device is the ohmic resistance between the source (Sx) and drain (Dx) pins of the

device. The on-resistance varies with input voltage and supply voltage. The symbol RON is used to denote

on-resistance. Figure 14-1 shows the measurement setup used to measure RON. Voltage (V) and current (ISD)

are measured using this setup, and RON is computed with RON = V / ISD.

V

Dx

V

S

I

SD

Sx

RON

Figure 14-1. On-Resistance Measurement Setup

TMUX4821, TMUX4819

SCDS487A – OCTOBER 2025 – REVISED DECEMBER 2025

www.ti.com

14

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