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Texas Instruments INA751x Current-Sense Amplifier

Texas Instruments INA751x Current-Sense Amplifier is a voltage-output current-sense amplifier with an integrated 800µΩ shunt resistor. This amplifier is designed to monitor bidirectional current over a common-mode range of -4V to +110V, independent of the supply voltage. The adjustable gain option helps optimize the system's dynamic range. The INA751x current-sense amplifier operates from a single 2.7V to 5.5V power supply, drawing a maximum of 4.25mA of supply current. Applications include 48V DC/DC converters, 48V battery management systems, macro Remote Radio Unit (RRU), 48V rack servers, 48V merchant network, and server Power Supply Unit (PSU).

The Texas Instruments INA751x amplifier features an internal amplifier with a precision zero-drift topology and an excellent Common-Mode Rejection Ratio (CMRR). This high-speed current-sensing amplifier helps the output settle quickly after common-mode transients. All versions are specified over the extended operating temperature range (-40°C to +125°C) and are available in a 14-pin VQFN package.

Features

  • Precision design with integrated shunt resistor:
    • ±35A continuous current at 25°C
    • ±25A continuous current at 125°C
    • 800µΩ shunt resistor
    • 2.5nH shunt inductance
  • -4V to +110V wide common-mode voltage range
  • 1MHz high small-signal bandwidth
  • Excellent CMRR:
    • 160dB DC CMRR
    • 114dB AC CMRR at 50kHz
  • High measurement accuracy:
    • System gain error (maximum):
      • Version A: ±0.4%, ±40ppm/°C drift
      • Version B: ±1%, ±100ppm/°C drift
    • Offset current (maximum):
      • Version A: ±20mA, ±35mA over temperature
      • Version B: ±105mA, ±125mA over temperature
  • 40mV/A to 800mV/A adjustable gain with external resistor divider network
  • Open-drain temperature alert at TJ of 160°C

Applications

  • 48V DC/DC converters
  • 48V Battery Management Systems (BMS)
  • Test and measurement
  • Macro Remote Radio Unit (RRU)
  • 48V rack servers
  • 48V merchant network and server Power Supply Unit (PSU)

Application Diagram

Application Circuit Diagram - Texas Instruments INA751x Current-Sense Amplifier

Functional Block Diagram

Block Diagram - Texas Instruments INA751x Current-Sense Amplifier

Related Products

Texas Instruments INA750x Current-Sense Amplifiers

This device is a voltage-output current sense amplifier with an integrated shunt resistor of 800µΩ.

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Related EVMs

Texas Instruments INA75xEVM Evaluation Modules

Allows users to evaluate the INA750x and INA751x current-sense amplifiers.

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Published: 2026-11-02 | Updated: 2026-11-02