1 Features
• Compatible with high-speed I3C signals
• High performance switch characteristics:
– Bandwidth (–3 dB): 3.0 GHz
– RON (typical): 3 Ω
– CON (typical): 1.7 pF
– TPD (typical): 60 ps
– TSWEK (typical): 2 ps
• Low current consumption: 12 μA (typical)
• Special features:
– IPOFF protection prevents current leakage in
Powered-Down state
– 1.8 V and 3.3 V compatible control inputs
(SEL, EN)
• 3.3 V supply voltage
• Industrial temperature range: –40 to 125°C
• Compact 10-pin 1.4 mm × 1.8 mm, UQFN package

2 Applications
• I3C (SenseWire)
• I3C and I2C peripheral switching
• Servers
• Handset: smart phone
• Notebook PC
• Tablet: multimedia
• Electronic point-of-sale
• Field instrumentation
• Portable monitor

3 Description
The TMUX121 is a high performance bidirectional
2-channel, 2:1 (SPDT) switch that supports both
differential and single ended signals. The TMUX121
is an analog passive switch which features power-off
protection forcing all I/O pins to be in high-impedance
mode when power is not present on the VDD pin. The
select and enable pins of the TMUX121 compatible
with 1.8 V and 3.3 V control voltage, allowing them
to be directly interfaced with the General purpose
I/O (GPIO) from low voltage processors. This, along
with the low on-resistance and low on capacitance of
the device, make the TMUX121 an excellent choice
for supporting switching a wide range of analog
signals and digital communication protocol standards,
including high-speed standards such as I3C.
The TMUX121 comes in a small 10-pin UQFN
package with only 1.8 mm × 1.4 mm in size, which
makes it useful when PCB area is limited.