Texas Instruments INA254A2IPWAR

Overview

INA254A2IPWAR from Texas Instruments is a high-voltage, bidirectional current-shunt monitor integrating a precision 400-µΩ shunt resistor and zero-drift amplifier in a single 24-pin HTSSOP package. It delivers 40 mV/A gain, ±50 A continuous current sensing from –40°C to +85°C, 0.5% system gain error, and operates over –4 V to +80 V common-mode range - enabling accurate real-time current measurement in high-dv/dt motor-drive and solenoid control circuits.

For engineers reviewing the INA254A2IPWAR datasheet, INA254A2IPWAR pinout, INA254A2IPWAR application, or INA254A2IPWAR equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and PWM rejection performance, and real-world application constraints for high-side/low-side bidirectional sensing in industrial power systems.

Technical Context

The INA254A2IPWAR implements a Kelvin-connected integrated shunt with 400-µΩ nominal resistance and 10 ppm/°C drift (0°C–125°C), paired with a zero-drift chopped amplifier achieving >120 dB DC CMRR and 90 dB AC CMRR at 50 kHz. Its enhanced PWM rejection circuitry suppresses large dv/dt transients without requiring external filtering.

It supports bidirectional operation via dual reference inputs (REF1/REF2), delivers rail-to-rail output swing (VS – 0.2 V to GND + 10 mV), and maintains 350 kHz –3 dB bandwidth with 2 µs settling time for overcurrent detection. The device draws only 2.4 mA max supply current from 2.7 V to 5.5 V.

Key Specifications

Pinout & Package

INA254A2IPWAR is housed in a thermally enhanced 24-pin HTSSOP (PWA) package measuring 9.50 mm × 4.40 mm, optimized for high-current PCB layout with dedicated IS+ and IS– terminals and Kelvin sense pins (SH+, SH–) to eliminate parasitic resistance effects.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A2QDRQ1 and INA253A2IPW, the INA254A2IPWAR uniquely combines automotive-grade reliability (150°C junction rating), integrated Kelvin shunt, and superior thermal dissipation - making it optimal for space-constrained, high-current industrial motor and actuator systems requiring minimal calibration overhead.

Availability

INA254A2IPWAR is available at Aetrix Electronics and suitable for 48-V motor controls, DC/DC converters, and solenoid/actuator systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for INA254A2IPWAR 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 INA254 product line was designed specifically for high-accuracy, high-dv/dt current sensing in industrial motor drives, power supplies, and electromechanical actuation - integrating shunt and amplifier to eliminate system-level calibration variables.

FAQ

What is the maximum continuous current rating for INA254A2IPWAR at 125°C ambient?

The INA254A2IPWAR supports ±30 A continuous current at 125°C ambient temperature, as specified in Figure 8-1 of the datasheet. This derating accounts for thermal limits of the 1-mΩ total package resistance and junction temperature cap of 150°C. At 25°C ambient, it sustains ±50 A continuously. Designers must verify PCB copper weight, airflow, and thermal vias to achieve rated performance in actual layouts.

Does INA254A2IPWAR require external calibration to achieve its 0.5% system gain error specification?

No - the INA254A2IPWAR achieves ±0.5% system gain error (–40°C to +125°C) without external calibration due to factory matching of its integrated 400-µΩ shunt resistor and zero-drift amplifier. This system-level calibration is performed during production, eliminating the need for end-equipment trim resistors or firmware gain correction - a key advantage over discrete shunt + op-amp solutions.

Can INA254A2IPWAR be used for low-side current sensing?

Yes - the INA254A2IPWAR supports both high-side and low-side configurations. For low-side sensing, connect IS– to system ground and IS+ to load return path; REF1 and REF2 are biased to GND or VS/2 depending on unidirectional/bidirectional requirements. Its rail-to-rail output (GND + 10 mV min) ensures valid signal integrity even at near-zero current.

What is the purpose of the RES pin (pin 15) on INA254A2IPWAR?

The RES pin on INA254A2IPWAR is a reserved function pin and must be connected to GND per Table 6-1 of the datasheet. Leaving it floating or connecting to other potentials may cause undefined behavior or degraded performance. This pin has no active circuit function and serves internal test or future feature enablement purposes only.

How does the enhanced PWM rejection in INA254A2IPWAR differ from standard CMRR?

Standard CMRR measures rejection of steady-state common-mode voltage, whereas INA254A2IPWAR's enhanced PWM rejection specifically attenuates large dv/dt transients (e.g., 10–100 V/ns) associated with MOSFET switching edges. This is achieved through internal circuitry that suppresses fast common-mode slew rates before amplification - resulting in clean output waveforms even during aggressive PWM gating, unlike basic CMRR-limited amplifiers.