1 Features
• Supply range: 1.8V to 5.5V
• Beyond the supply signal range: -15V to 15V
• High current support: 1.1A (maximum)
• Ultra-low on-resistance: 0.16Ω
• Low on-resistance flatness: 0.1mΩ typ
• 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 TMUX48xx is a complementary metaloxide
semiconductor (CMOS) multiplexer with 2
configurations available: 1:1, single-pole, single-throw
(SPST) 2-channel (TMUX4821) and 2:1, single-pole,
double-throw (SPDT) 1-channel (TMUX4819). This
device works with a single supply (1.8V to 5.5V),
but can pass bidirectional analog and digital signals
beyond the supply from -15V to 15V.
The TMUX48xx also features bidirectional powered
off protection up to ±15V, 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
TMUX48xx is an excellent choice for passing
precision analog and audio signals without adding
distortion.