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 compact, feature rich, fully integrated current loop protector suitable for analog inputs, analog outputs, sensor transmitters, HART Inputs and UART IO protection. It provides Universal Input protection for ±20 mA, 0 to 20 mA, 4-20 mA. Low RON of 7.5 Ω minimizes drop in the current loop, thereby extending operating range and supporting operation even with lower voltage power supplies. The device can withstand and protect the loads from positive and negative supply voltages up to ±50 V. The MODE pin allows flexibility to enable 2x current limit through the device to enable proper startup of two wire transmitters. Device is capable of operating from an external bipolar supply as low as ± 2.25 V to ±20 V. It can also be powered from unipolar supplies as low as 3 V to 30 V. TPS26610 device features loop power mode to facilitate loop testing in un-powered state without ±Vs supplies.

The device also protects the system from output side miswiring in Analog Outputs and sensor transmitters by turning off the current path. The internal robust protection control blocks along with the 50-V rating of the TPS2661x helps to protect against surge (IEC61000-4-5) and EFT (IEC61000-4-4) transients for signal lines. The device greatly reduces system footprint by its 2.9 mm × 1.6 mm 8-pin SOT-23 package.

Device Information(1)
SOT-23 (8)2.9 mm × 1.6 mm
For all available packages, see the orderable addendum at the end of the data sheet.
GUID-20201106-CA0I-QPXN-J60V-8H1MLLX6KF84-low.gifTypical Circuit Schematic
GUID-20201030-CA0I-MJKH-T08D-VKCQQ1G6SLPQ-low.pngMiswiring Protection on Input From Field Supply