1 Features
• AEC-Q100 qualified for automotive applications
– Device Temperature Grade 1: –40°C to 125°C
ambient operating temperature
• Injection current control
• Back-powering protection
– No ESD diode path to VDD
• Wide supply range: 1.62V to 5.5V
• Fast settling times
• Low ON-capacitance
• Bidirectional signal path
• Optimized for high-impedance loads
• Rail-to-rail operation
• 1.8V logic compatible
• Fail-safe logic
• Break-before-make switching
• Short-to-battery protection for ON and OFF
channels
• Functional safety-capable
– Documentation available to aid functional safety
system design
• TMUX1308A-Q1 – pin compatible with:
– Industry standard 4051, 4851 and 1308
multiplexers
• TMUX1309A-Q1 – pin compatible with:
– Industry standard 4052, 4852 and 1309
multiplexers

2 Applications
• Analog and digital multiplexing and demultiplexing
• Diagnostics and monitoring
• Zonal architecture
• Body control modules
• Battery management systems (BMS)
• HVAC control module
• Automotive head unit
• Telematics
• On-board (OBC) and wireless charging

3 Description
The TMUX1308A-Q1 and TMUX1309A-Q1 are
general purpose complementary metal-oxide
semiconductor (CMOS) multiplexers (MUX). The
TMUX1308A-Q1 is an 8:1, 1-channel (single-ended)
mux, while the TMUX1309A-Q1 is a 4:1, 2-channel
(differential) mux. The devices support bidirectional
analog and digital signals on the source (Sx) and
drain (Dx) pins ranging from GND to VDD.
The TMUX13xxA-Q1 devices have an internal
injection current control feature, which eliminates
the need for external diode and resistor networks
typically used to protect the switch and keep the
input signals within the supply voltage. The internal
injection current control circuitry allows signals on
disabled or enabled signal paths to exceed the supply
voltage. Disabled channels with voltages above VDD
are prevented from affecting the signal of the enabled
signal path. Additionally, the TMUX13xxA-Q1 devices
do not have an internal diode path to the supply pin,
which eliminates the risk of damaging components
connected to the supply pin or providing unintended
power to the supply rail. Due to these features RC
networks on the input side can be reduced- allowing
for a much smaller current limiting resistor which can
have a significant impact on the ramp rates.
All logic inputs have 1.8V logic compatible thresholds,
allowing for both TTL and CMOS logic compatibility
when operating with a valid supply voltage. Fail-Safe
Logic circuitry allows voltages on the control pins to
be applied before the supply pin, protecting the device
from potential damage.