7 Parameter Measurement Information

7.1 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 7-1 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 7-1. On-Resistance Measurement Setup

7.2 On-Leakage Current

Source on-leakage current is defined as the leakage current flowing into or out of the source pin when the switch

is on. This current is denoted by the symbol IS(ON). Drain on-leakage current is defined as the leakage current

flowing into or out of the drain pin when the switch is on. This current is denoted by the symbol ID(ON). Either the

source pin or drain pin is left floating during the measurement. Figure 7-2 shows the circuit used for measuring

the on-leakage current, denoted by IS(ON) or ID(ON).

VDD

VDD

S1A

GND

VS

S1B

D1

VD

ID (ON)

VDD

VDD

S1A

GND

VS

S1B

D1

Vs

A

IS (ON)

N.C.

N.C.

A

S2A

VS

S2B

D2

VD

ID (ON)

S2A

VS

S2B

D2

Vs

A

N.C.

N.C.

A

IS (ON)

Figure 7-2. On-Leakage Measurement Setup

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TMUX4827

SCDS457A – MAY 2023 – REVISED JUNE 2023

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