SBOS775B September 2016  – April 2017 INA302 , INA303


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1Bidirectional Current Sensing and Out-of-Range Detection
      2. 7.3.2Alert Outputs
      3. 7.3.3Alert Operating Mode
        1. Output Mode
        2. Output Mode
      4. 7.3.4Setting Alert Thresholds
        1. Current Limit
          1. Current Limit: Example
        2. Current Limit
      5. 7.3.5Selecting a Current-Sensing Resistor (RSENSE)
        1. a Current-Sensing Resistor: Example
      6. 7.3.6Hysteresis
    4. 7.4Device Functional Modes
      1. 7.4.1Input Filtering
      2. 7.4.2Using The INA30x With Common-Mode Transients Above 36 V
  8. Applications and Implementation
    1. 8.1Application Information
    2. 8.2Typical Application
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
      3. 8.2.3Application Curve
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Documentation Support
      1. 11.1.1Related Documentation
    2. 11.2Related Links
    3. 11.3Receiving Notification of Documentation Updates
    4. 11.4Community Resources
    5. 11.5Trademarks
    6. 11.6Electrostatic Discharge Caution
    7. 11.7Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Orderable Information


  • Wide Common-Mode Input Range: –0.1 V to 36 V
  • Dual Comparator Outputs:
    • INA302: Two Independent Overlimit Alerts
    • INA303: Window Comparator
    • Threshold Levels Set Individually
    • Comparator 1 Alert Response: 1 µs
    • Comparator 2 Adjustable Delay: 2 µs to 10 s
    • Open-Drain Outputs With Independent Latch Control Modes
  • High Accuracy Amplifier:
    • Offset Voltage: 30 µV (Max, A3 Version)
    • Offset Voltage Drift: 0.5 µV/°C (Max)
    • Gain Error: 0.15% (Max, A3 Version)
    • Gain Error Drift: 10 ppm/°C
  • Available Amplifier Gains:
    • INA302A1, INA303A1: 20 V/V
    • INA302A2, INA303A2: 50 V/V
    • INA302A3, INA303A3: 100 V/V


  • Overcurrent Protection
  • Motor Control
  • Power-Supply Protection
  • Computers and Servers
  • Telecom Equipment


The INA302 and INA303 devices feature a high common-mode, bidirectional, current-sensing amplifier and two high-speed comparators to detect out-of-range current conditions. The INA302 comparators are configured to detect and respond to overcurrent conditions. The INA303 comparators are configured to respond to both over- and undercurrent conditions in a windowed configuration. The device features an adjustable limit threshold range for each comparator set using an external limit-setting resistor. These current-shunt monitors can measure differential voltage signals on common-mode voltages that can vary from –0.1 V up to 36 V, independent of the supply.

The open-drain alert outputs can be configured to operate in either a transparent mode (output status follows the input state) or in a latched mode (alert output is cleared when the latch is reset). The alert response time for comparator 1 is under 1 µs and the alert response for comparator 2 is set through an external capacitor ranging from 2 µs to 10 s.

This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 950 μA. The device is specified over the extended operating temperature range (–40°C to +125°C), and is available in a 14-pin TSSOP package.

Device Information

INA302TSSOP (14)4.40 mm × 5.00 mm
INA303TSSOP (14)4.40 mm × 5.00 mm

Typical Application

INA302 INA303 frontpagecircuit_bos775.gif