The TPS2661x is a family of devices providing complete protection for current inputs, voltage inputs/outputs, and sensor supply in industrial and process automation systems. The device supports both unipolar 4-mA to 20-mA current loops and bipolar ±20-mA current loops. The TPS26610 and TPS26613 are tailored for current inputs. The device can be powered from an external supply and draws < 100-nA maximum current from the current loop enabling design of high accuracy analog input systems. The devices feature an accurate 32-mA current limit, which enables using low power components in the loop like the sense resistors, which reduces the overall system size and cost. The TPS26611 and TPS26614 are specifically tailored for universal current inputs and voltage/current multiplexed inputs while the TPS26612 is tailored for protection of two wire sensor transmitters. The TPS2661x devices feature a configurable MODE pin to allow higher current for powering up of a variety of two wire transmitters. The TPS26611 also has enable control for designing V/I multiplexed analog inputs or universal analog input-output modules. The device also features a signal-good output to indicate if the there is a valid current input. The signal good pin goes high in the event of any fault or during start-up of the system if there is an inrush current. The device also protects the system from output miswiring in analog output modules or sensor transmitters by cutting off the current path if the OUT pin goes outside the +/–Vs supply rails.

The robust protection of the TPS2661x along with its ±50-V rating helps to simplify the system designs for surge compliance. The TPS2661x devices are immune to noise tests like electrical fast transients that are common in industrial applications. These devices also simplify the system design for protection from surge transients (IEC61000-4-5).