Texas Instruments INA253A1QPWRQ1

Overview

INA253A1QPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified, bidirectional precision current sense amplifier with integrated 2 mΩ shunt resistor, 100 mV/A fixed gain, –4 V to +80 V common-mode range, and 350 kHz bandwidth. It delivers ±15 mA input offset current max and 0.4% system gain error for real-time motor and solenoid current monitoring in powertrain control units.

For engineers reviewing the INA253A1QPWRQ1 datasheet, INA253A1QPWRQ1 pinout, INA253A1QPWRQ1 application, or INA253A1QPWRQ1 equivalent, key selection criteria include PWM rejection capability, integrated shunt temperature coefficient (10 ppm/°C from 0 °C to 125 °C), output swing to rail (VS – 0.2 V), quiescent current (2.4 mA max), and TSSOP-20 package compatibility with Kelvin sensing layout requirements.

Technical Context

The INA253A1QPWRQ1 integrates a zero-drift chopped amplifier with a matched 2 mΩ Kelvin-connected shunt resistor, enabling calibration-equivalent accuracy without external trimming. 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 operates from a single 2.7 V to 5.5 V supply, supports bidirectional current sensing up to ±15 A continuous at –40 °C to +85 °C, and provides voltage output referenced to user-defined REF1/REF2 pins. The device is specified across –40 °C to +125 °C ambient and features 3 nH shunt inductance and 4.5 mΩ total package resistance.

Key Specifications

Pinout & Package

The INA253A1QPWRQ1 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 SBOS950A datasheet Figure 5-1 and Table 5-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA253A1QPWRQ1, INA240A1QDRQ1 offers higher voltage rating but adds layout complexity and calibration burden, while MAX40056ATA+T provides similar integration but lacks automotive qualification and functional safety support - making INA253A1QPWRQ1 the only drop-in solution for ASIL-B powertrain current sensing.

Availability

INA253A1QPWRQ1 is available at Aetrix Electronics and suitable for diesel engine control, gasoline engine control, automatic transmission solenoid actuation, and 48 V mild-hybrid powertrain current sensing requiring stable component supply across automotive production lifecycles.

Supply support for INA253A1QPWRQ1 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 automotive, industrial, and personal electronics markets.

The INA253-Q1 product line was designed specifically for AEC-Q100-compliant, high-accuracy bidirectional current sensing in automotive powertrain systems - integrating precision shunt resistors and zero-drift amplifiers to eliminate calibration and layout variability.

FAQ

What is the maximum continuous current rating for the INA253A1QPWRQ1?

The INA253A1QPWRQ1 supports ±15 A continuous current at ambient temperatures from –40 °C to +85 °C. At +125 °C ambient, the derated maximum is ±10 A due to thermal limits of the 4.5 mΩ package resistance. This rating assumes 1-oz. copper PCB planes and no forced airflow; with 2-oz. copper and airflow, ±15 A is sustainable across the full –40 °C to +125 °C range. The INA253A1QPWRQ1's integrated shunt and thermal design ensure safe operation without external heatsinking.

Does the INA253A1QPWRQ1 require external calibration for production use?

No, the INA253A1QPWRQ1 does not require external calibration. Its integrated 2 mΩ shunt resistor is factory-matched to the zero-drift amplifier, achieving ±0.4% system gain error and ±15 mA input offset current without trimming. The 10 ppm/°C temperature coefficient (0 °C to 125 °C) and <15 ppm/°C total system drift ensure stable performance across automotive operating conditions. This calibration-equivalent accuracy is confirmed in TI SBOS950A datasheet Section 6.5 and eliminates post-assembly calibration steps for the INA253A1QPWRQ1.

How does the enhanced PWM rejection in the INA253A1QPWRQ1 improve motor control accuracy?

The INA253A1QPWRQ1's enhanced PWM rejection suppresses large dv/dt common-mode transients generated during motor inverter switching - reducing output ringing and settling time errors that degrade current waveform fidelity. Unlike standard amplifiers relying solely on bandwidth, this feature uses dedicated circuitry to attenuate transients before amplification, preserving 90 dB AC CMRR at 50 kHz. As a result, the INA253A1QPWRQ1 delivers clean, real-time current measurements even during 20 kHz PWM commutation, enabling precise torque control and overcurrent protection without external filtering components.

Can the INA253A1QPWRQ1 be used in high-side current sensing configurations?

Yes, the INA253A1QPWRQ1 supports high-side current sensing with its –4 V to +80 V common-mode input range, allowing direct connection between battery positive and load. Its 350 kHz bandwidth and 100 mV/A gain enable accurate capture of fast-switching currents in 12 V and 48 V automotive systems. The device's Kelvin-connected IS+/IS– and SH+/SH– pins maintain measurement integrity by separating high-current paths from sensitive sense nodes. When used in high-side configuration, the INA253A1QPWRQ1's output remains referenced to system ground via REF1/REF2, simplifying ADC interfacing without level-shifting circuitry.

What is the role of the REF1 and REF2 pins on the INA253A1QPWRQ1?

The REF1 and REF2 pins on the INA253A1QPWRQ1 set the output common-mode voltage baseline, defining the zero-current output level. Their differential voltage determines the output offset: V_OUT = Gain × I_SENSE + (REF1 – REF2)/2. For unidirectional sensing, REF2 is typically grounded and REF1 tied to VS/2, yielding a 0.5×VS mid-rail zero point. For bidirectional operation, both pins can be biased to establish symmetric positive/negative output swing. This flexible referencing eliminates the need for external op-amps or level-shifters and ensures the INA253A1QPWRQ1 output stays within ADC input ranges across varying supply voltages.