Texas Instruments INA253A2IPWR

Overview

INA253A2IPWR from Texas Instruments is a high-voltage, bidirectional current-shunt monitor with integrated 2-mΩ precision shunt resistor, zero-drift amplifier, and 200 mV/A fixed gain. It operates from 2.7 V to 5.5 V supply, supports –4 V to +80 V common-mode input range, 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 INA253A2IPWR datasheet, INA253A2IPWR pinout, INA253A2IPWR application, or INA253A2IPWR equivalent, this page delivers verified specifications, validated TSSOP-20 pin functions, confirmed bidirectional measurement capability, and two rigorously cross-referenced alternative parts for solenoid control, transmission systems, and DC/DC converter current monitoring.

Technical Context

The INA253A2IPWR 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 internal architecture eliminates external sense-resistor layout parasitics while maintaining system-calibrated accuracy.

It features dual reference inputs (REF1/REF2), dedicated Kelvin sense terminals (SH+/SH–), and three isolated current-input banks (IS+, IS–) tied to the same internal shunt path. The device uses enhanced transient suppression circuitry to reject large dv/dt common-mode edges without requiring external filtering, making it suitable for high-noise motor-drive environments.

Key Specifications

Pinout & Package

INA253A2IPWR is housed in a thermally enhanced 20-pin TSSOP package (6.50 mm × 4.40 mm), optimized for high-current PCB routing with exposed thermal pad (not electrically connected). The package supports ±15 A continuous current at ≤85°C ambient with 1-oz copper planes and no forced airflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A2QDRQ1 and MAX40056ATA+T, the INA253A2IPWR uniquely combines integrated Kelvin shunt, 350 kHz bandwidth, and <125 µA/°C offset drift - delivering superior accuracy and noise immunity in high-dv/dt motor and solenoid control without external component trade-offs.

Availability

INA253A2IPWR is available at Aetrix Electronics and suitable for motor controls, solenoid and valve controls, DC/DC converters, and transmission control systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for INA253A2IPWR 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 high-reliability power management ICs.

The INA253 product line was designed specifically for high-accuracy, high-noise industrial and automotive current sensing - integrating precision resistors and zero-drift amplifiers to eliminate system-level calibration and improve thermal stability in motor drives and actuator control.

FAQ

What is the maximum continuous current rating for the INA253A2IPWR?

The INA253A2IPWR supports ±15 A continuous current from –40°C to +85°C ambient temperature with standard PCB layout (1-oz copper, no forced airflow). At +125°C ambient, derated continuous current is ±10 A. This rating is based on the 4.5 mΩ total package resistance and thermal limits ensuring junction temperature remains below 150°C. The internal 2-mΩ shunt contributes precisely to this thermal profile.

Does the INA253A2IPWR require external calibration for accurate current measurement?

No, the INA253A2IPWR does not require external calibration. Its integrated 2-mΩ shunt resistor is factory-matched to the zero-drift amplifier, achieving system-level gain accuracy of ±0.4% over temperature - effectively providing calibration-equivalent performance out-of-the-box. The matched pair eliminates gain error sources associated with discrete resistor-amplifier combinations, making the INA253A2IPWR suitable for applications demanding high accuracy without post-assembly trimming.

How does the INA253A2IPWR handle PWM switching noise in motor drive applications?

The INA253A2IPWR employs enhanced PWM rejection circuitry that achieves 90 dB AC CMRR at 50 kHz and >120 dB DC CMRR, suppressing large dv/dt transients from IGBT or MOSFET switching without external filtering. Its internal architecture rejects common-mode edges before amplification, minimizing output ringing and transient overshoot - enabling clean current waveforms even during hard-switching events in BLDC or stepper motor drives using the INA253A2IPWR.

Can the INA253A2IPWR measure current in both directions, and how is polarity indicated?

Yes, the INA253A2IPWR is fully bidirectional: positive current flow (IS+ → IS–) produces a positive output voltage above the reference level set by REF1/REF2, while negative current (IS– → IS+) produces a correspondingly lower output voltage. The output is centered at (VREF1 – VREF2)/2, so polarity is determined by whether VOUT is above or below that midpoint - enabling seamless regenerative braking current monitoring in H-bridge and inverter topologies using the INA253A2IPWR.

What is the purpose of the SH+ and SH– pins on the INA253A2IPWR?

The SH+ and SH– pins provide Kelvin (4-wire) access to the internal 2-mΩ shunt resistor's sense nodes - allowing direct connection to IN+ and IN– to eliminate voltage drop errors caused by package and PCB trace resistance. These pins are essential for achieving the specified ±0.4% system gain accuracy; bypassing them and connecting IN+ directly to IS+ would introduce up to 2.5 mΩ of uncalibrated series resistance, degrading measurement fidelity. Their use is mandatory for precision applications relying on the INA253A2IPWR.