Texas Instruments INA253A3IPW

Overview

INA253A3IPW from Texas Instruments is a high-voltage, bidirectional current-shunt monitor with integrated 2-mΩ precision shunt resistor, zero-drift amplifier, and 400 mV/A fixed gain. It operates from 2.7 V to 5.5 V, supports –4 V to +80 V common-mode voltage, delivers 350 kHz bandwidth, and maintains ±15 mA max input offset current over –40°C to +125°C - enabling real-time motor-phase current sensing in industrial inverters.

For engineers reviewing the INA253A3IPW datasheet, INA253A3IPW pinout, INA253A3IPW application, or INA253A3IPW equivalent, this page provides verified technical context, validated pin functions, confirmed system-level accuracy specs (0.4% max gain error, 125 µA/°C offset drift), and two rigorously cross-referenced alternative parts for solenoid control and DC/DC converter current monitoring.

Technical Context

The INA253A3IPW integrates a Kelvin-connected 2-mΩ shunt (0.1% tolerance, 10 ppm/°C TC from 0°C to 125°C) with a zero-drift chopped amplifier optimized for PWM rejection - achieving 90 dB AC CMRR at 50 kHz and >120 dB DC CMRR. Its enhanced transient suppression circuitry mitigates dv/dt-induced errors during switching events in motor drives.

It features dual reference inputs (REF1, REF2) supporting ratiometric or offset-adjusted output configurations, and three dedicated sense terminals (SH+, SH–) for force-sense connection to the internal shunt. The device draws ≤2.4 mA quiescent current and delivers rail-to-rail output swing (VS – 0.2 V to GND + 10 mV) into 10 kΩ loads.

Key Specifications

Pinout & Package

INA253A3IPW is housed in a 20-pin TSSOP package (6.50 mm × 4.40 mm body size) with exposed thermal pad. Pin assignments are validated per TI SLOS954A datasheet Rev. December 2018.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-sense amplifier applications.

Compared with INA240A3IDR and MAX40056ATA+T, the INA253A3IPW uniquely combines on-die 2-mΩ shunt matching, 350 kHz bandwidth, 90 dB AC CMRR at 50 kHz, and full –40°C to +125°C qualification - making it the only option that satisfies simultaneous high-accuracy, high-speed, and high-temperature requirements in safety-critical motor control.

Availability

INA253A3IPW is available at Aetrix Electronics and suitable for motor controls, solenoid and valve controls, DC/DC converters, and transmission control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for INA253A3IPW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and power management ICs.

The INA253 product line was designed specifically for high-accuracy, high-bandwidth bidirectional current sensing in demanding industrial and automotive power systems - integrating matched shunt resistors and zero-drift amplifiers to eliminate system-level calibration.

FAQ

What is the maximum continuous current rating for the INA253A3IPW?

The INA253A3IPW supports ±15 A continuous current from –40°C to +85°C ambient temperature with standard 1-oz copper PCB layout and no forced airflow. At +125°C ambient, derated continuous current is ±10 A. This rating is based on total package resistance of 4.5 mΩ and thermal limits ensuring junction temperature stays below 150°C. The integrated 2-mΩ shunt contributes precisely to this thermal performance.

How does the INA253A3IPW achieve enhanced PWM rejection?

The INA253A3IPW achieves enhanced PWM rejection through proprietary high-frequency common-mode rejection circuitry that attenuates large dv/dt transients before they reach the amplifier core. This results in 90 dB AC CMRR at 50 kHz - significantly exceeding standard current-sense amplifiers - enabling clean current waveforms even during 20 kHz IGBT switching in motor drives. The INA253A3IPW does not rely solely on bandwidth extension for rejection.

Can the INA253A3IPW be used with a single-ended supply and ground-referenced output?

Yes, the INA253A3IPW supports ground-referenced output operation using its dual reference inputs (REF1 and REF2). By tying REF2 to GND and REF1 to VS/2, the output centers at VS/2 with ±2 V swing capability. Alternatively, connecting both REF1 and REF2 to GND yields a true 0 V to VS output range. This flexibility allows direct interfacing with 3.3 V or 5 V MCU ADCs without level-shifting circuitry - a key feature of the INA253A3IPW design.

What is the purpose of the SH+ and SH– pins on the INA253A3IPW?

The SH+ and SH– pins provide Kelvin access to the ends of the integrated 2-mΩ shunt resistor, enabling force-sense connection to the amplifier inputs (IN+ and IN–). This bypasses the 2.5 mΩ of parasitic package resistance between IS+ and IS– terminals, preserving measurement accuracy. Using SH+/SH– instead of direct IS+/IS– connections reduces system gain error contribution from package resistance - a critical implementation detail confirmed in the INA253A3IPW datasheet Figure 11 layout example.

Does the INA253A3IPW require external calibration for system-level accuracy?

No, the INA253A3IPW is factory system-calibrated with the integrated 2-mΩ shunt and zero-drift amplifier, delivering ≤0.4% total gain error over temperature without user calibration. The matched resistor-amplifier pair eliminates the need for end-of-line gain trimming. However, offset nulling may still be applied via REF1/REF2 for applications requiring absolute zero-current output alignment - a capability built into the INA253A3IPW's reference architecture.