SLVSFE3B November   2020  – May 2021 TPS2661


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Overload Protection and Fast-Trip
      2. 8.3.2 Reverse Current Blocking for Unipolar Current Inputs (4 - 20 mA, 0 - 20 mA)
      3. 8.3.3 OUTPUT/INPUT Cutoff During Over-Voltage, Under-Voltage Due to Miswiring
        1. Output Over-Voltage
        2. Output or Input Under-Voltage
      4. 8.3.4 External Power Supply(±Vs)
      5. 8.3.5 Loop Testing Without ±Vs Supply (Loop Power Mode in TPS26610 Only)
        1. Supply Sensing with VSNS For Loop Power Mode (TPS26610)
      6. 8.3.6 Enable Control (TPS26611 and TPS26612)
      7. 8.3.7 Signal Good Indicator (SGOOD)
    4. 8.4 Device Functional Modes
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application: Analog Input Protection for Current Inputs with TPS26610
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure for Current Inputs with TPS26610
        1. Selecting ±Vs Supplies for TPS26610
        2. Selecting RBurden
        3. Selecting MODE Configuration for TPS26610
      3. 9.2.3 Application Performance Plots for Current Inputs with TPS26610
    3. 9.3 Typical Application: Analog Input Protection for Multiplexed Current and Voltage Inputs with TPS26611
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedure for Analog Input Protection for Multiplexed Current and Voltage Inputs with TPS26611
        1. Selecting ±Vs Supplies for TPS26611
        2. Selecting MODE Configuration for TPS26611
        3. Selecting Bias Resistors R1, R2 for Setting Common Mode Voltage for Voltage Inputs
      3. 9.3.3 Application Performance Plots for V/I Inputs with TPS26611
    4. 9.4 System Examples
      1. 9.4.1 Power Supply Protection of 2-Wire Transmitter with TPS26612
      2. 9.4.2 Protection of 3-Wire Transmitters and Analog Output Modules with TPS26611/12
      3. 9.4.3 UART IO Protection with TPS26611/12
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information


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 - 20-mA current loops and bipolar ±20-mA current loops. TPS26610 is 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. TPS26611 is specifically tailored for universal current inputs, voltage/current multiplexed inputs while TPS26612 is tailored for protection of two wire sensor transmitters. TPS2661x devices feature a configurable MODE pin to allow higher current for powering up of a variety of two wire transmitters. 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 startup 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 the surge compliance. TPS2661x devices are immune to noise tests like Electrical Fast Transients that are common in industrial applications and these devices also simplify the system design for protection from surge transients (IEC61000-4-5).