SPST four-channel precision switches suit medical equipment to industrial systems

08-08-2019 | Texas Instruments | Semiconductors

Texas Instruments TMUX111x SPST Four-Channel Precision Switches are precision CMOS devices that have four independently selectable 1:1, SPST switches. Wide operating supply of 1.08V to 5.5V provides for use in a wide array of medical equipment to industrial systems applications. The device supports bidirectional analog and digital signals on the source (Sx) and drain (Dx) pins ranging from GND to VDD.


The switches of the TMUX1111 are turned on with Logic 0 on the relevant logic control inputs, while Logic 1 is needed to turn on switches in the TMUX1112. The four channels of the TMUX1113 are split with two switches supporting Logic 0, whilst the other two switches support Logic 1. The TMUX1113 displays break-before-make switching, which enables the device to be employed in cross-point switching applications.


The devices are part of the precision switches and multiplexers family. These devices provide very low on and off leakage currents, and low charge injection, enabling them to be utilised in high precision measurement applications. The low supply current of 8nA and small package options allow use in portable applications.


Typical applications include sample-and-hold circuits, feedback gain switching, signal isolation, field transmitters, PLC, factory automation and control, ultrasound scanners, patient monitoring and diagnostics, ECG, DAQ, ATE test equipment, and battery test equipment among many others.

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