TMUX28xx ±5.5V Beyond the Supply, 1:1 2-Channel, 2:1 1-Channel, Power-Off

Protection Switch, with 0.16Ω Ron, 1.2V and 1.8V Compatible Logic

1 Features

• Supply range: 1.8V to 5.5V

• Beyond the supply signal range: -5.5V to 5.5V

• High current support: 1.1A (maximum)

• Ultra-low on-resistance: 0.16Ω

• Low on-resistance flatness: 1.0mΩ

• Low THD+N: 0.001% (-100dB)

• –40°C to +125°C operating temperature

• Power-Off Protection

• 1.8V logic compatible at 5V VDD

• 1.2V logic compatible at 1.8V VDD

• Integrated Pull-Down Resistor on Logic Pins

• Fail-safe logic

• Break-before-make switching

2 Applications

• Land mobile radios

• Defense radios

• Audio input or output switching

• Ultrasonic gas flow transmitters

• Analog input modules

• Industrial module detection

3 Description

The

TMUX28xx

is

a

complementary

metal-

oxide semiconductor (CMOS) multiplexer with 2

configurations available: 1:1, single-pole, single-throw

(SPST) 2-channel (TMUX2821) and 2:1, single-pole,

double-throw (SPDT) 1-channel (TMUX2819). This

device works with a single supply (1.8V to 5.5V),

but can pass bidirectional analog and digital signals

beyond the supply from -5.5V to 5.5V.

The TMUX28xx also features bidirectional powered

off protection up to ±5.5V, which isolates the switch

even when there is no supply voltage present (VDD

= 0V). Without this protection feature, any voltage on

the switch can back-power the supply rail through an

internal ESD diode and cause potential damage to the

rest of the system.

With 0.001% THD+N and 1mΩ RON-flatness, the

TMUX28xx is an excellent choice for passing

precision analog and audio signals without adding

distortion.

Package Information

PART NUMBER

PACKAGE(1)

PACKAGE SIZE(2)

TMUX2819

DSG (SON, 8)

2mm × 2mm

TMUX2821

(1)

For more information, see Section 11.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

SA

SB

D

SEL

V

DD

Decoder

S2

S1

D1

SEL1

V

DD

Decoder

D2

EN

SEL2

TMUX2819 and TMUX2821 Block Diagram

TMUX2821, TMUX2819

SCDS488 – DECEMBER 2025

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.