Texas Instruments INA253A2IPW

Overview

INA253A2IPW from Texas Instruments is a high-voltage, bidirectional, zero-drift current-shunt monitor with an integrated 2-mΩ precision shunt resistor and fixed 200 mV/A gain. It operates from 2.7 V to 5.5 V, supports –4 V to +80 V common-mode input range, delivers 350 kHz bandwidth, and maintains ±15 A continuous current capability across –40°C to +85°C - used for real-time inline current measurement in motor-drive and solenoid valve control.

For engineers reviewing the INA253A2IPW datasheet, INA253A2IPW pinout, INA253A2IPW application, or INA253A2IPW 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-checked alternative parts for current-sense amplifier selection in industrial power systems.

Technical Context

The INA253A2IPW integrates a Kelvin-connected 2-mΩ shunt (10 ppm/°C TC from 0°C to 125°C) with a zero-drift chopped amplifier, enabling system-calibrated current measurement without external calibration. Its enhanced PWM rejection circuitry suppresses large dv/dt transients while maintaining >120 dB DC CMRR and 90 dB AC CMRR at 50 kHz.

It uses dual reference inputs (REF1, REF2) to set output common-mode voltage, supports unidirectional or bidirectional sensing via IN+ and IN–, and routes internal shunt terminals (SH+, SH–) externally for optional filtering - all within a single 20-pin TSSOP package with 4.5 mΩ total package resistance and 3 nH inductance.

Key Specifications

Pinout & Package

INA253A2IPW is housed in a 20-pin TSSOP package (6.50 mm × 4.40 mm body size) with exposed thermal pad. Pin functions 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 INA253A2IPW, INA240A2QDRQ1 offers automotive qualification but demands external shunt design effort and sacrifices system-level accuracy, while INA250A2IDGSR trades bandwidth and current capacity for smaller size - making INA253A2IPW optimal for industrial motor drives requiring both speed and robustness.

Availability

INA253A2IPW is available at Aetrix Electronics and suitable for motor control systems, solenoid actuation, DC/DC converter monitoring, and transmission control units requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for INA253A2IPW 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The INA253 product line was designed specifically for high-accuracy, high-voltage bidirectional current sensing in power-constrained motor and actuator systems - integrating precision shunt and zero-drift amplifier to eliminate calibration overhead and layout complexity.

FAQ

What is the maximum continuous current rating for the INA253A2IPW?

The INA253A2IPW supports ±15 A continuous current from –40°C to +85°C under standard PCB layout conditions (1-oz copper, no airflow). At +125°C ambient, derated continuous current is ±10 A. This rating accounts for total 4.5 mΩ package resistance heating and junction temperature limits. The integrated 2-mΩ shunt contributes only part of that resistance; the remainder arises from bond wires and lead frames. The INA253A2IPW datasheet specifies these limits in Section 7.5 and Figure 29.

Does the INA253A2IPW require external calibration to achieve its stated accuracy?

No, the INA253A2IPW does not require external calibration to achieve its specified 0.4% max gain error and ±15 mA max offset current. Its system-level accuracy results from factory matching of the integrated 2-mΩ shunt resistor and zero-drift amplifier - a process documented in TI's SLOS954A datasheet Section 8.3.1. Using the internal shunt with the onboard amplifier delivers calibrated performance; using the shunt standalone yields ~5% tolerance and invalidates all accuracy claims for the INA253A2IPW.

How does the INA253A2IPW handle PWM switching noise in motor drive applications?

The INA253A2IPW employs dedicated enhanced PWM rejection circuitry that attenuates large dv/dt common-mode transients before they reach the amplifier core - distinct from relying solely on high bandwidth. This design achieves 90 dB AC CMRR at 50 kHz and suppresses output ringing during MOSFET/IGBT switching events. As confirmed in datasheet Figures 25–28 and Section 8.3.4, this enables clean current waveform reconstruction in BLDC motor phase-leg monitoring without external filtering components.

What is the function of the REF1 and REF2 pins on the INA253A2IPW?

The REF1 and REF2 pins on the INA253A2IPW set the output common-mode voltage. The amplifier output is referenced to (REF1 – REF2)/2, allowing bidirectional current measurement with centered output swing. For unidirectional sensing, tie REF2 to GND and REF1 to VS/2 to produce 0 V to VS output; for true bidirectional operation, drive REF1 and REF2 differentially (e.g., REF1 = VS, REF2 = 0 V) to center OUT at VS/2. This flexibility is detailed in Section 9.1 of the INA253A2IPW datasheet.

Can the SH+ and SH– pins of the INA253A2IPW be used for external filtering?

Yes, the SH+ and SH– pins provide direct Kelvin access to the internal 2-mΩ shunt resistor terminals and are explicitly intended for external RC filtering to improve PWM transient immunity. Per Section 6 and Figure 9 of the INA253A2IPW datasheet, connecting a capacitor between SH+ and SH– (or to GND) forms a low-pass filter that reduces high-frequency noise without degrading DC accuracy. However, excessive capacitance (>1 nF) may cause instability; the datasheet recommends ≤1 nF for stable operation with the INA253A2IPW.