Texas Instruments INA282AIDR

Overview

INA282AIDR from Texas Instruments is a zero-drift, voltage-output current shunt monitor optimized for high-accuracy bidirectional current sensing in industrial and automotive power systems. It features a –14 V to +80 V common-mode input range, 50 V/V fixed gain, ±20 µV max offset voltage, and operates from a single 2.7 V to 18 V supply - enabling precise measurement of as little as 10 mV full-scale shunt voltage drop in high-side or low-side configurations.

For engineers reviewing the INA282AIDR datasheet, INA282AIDR pinout, INA282AIDR application, or INA282AIDR equivalent, key selection considerations include its wide common-mode tolerance, ultra-low offset drift (±0.3 µV/°C), 140 dB CMRR, 10 kHz bandwidth, and SOIC-8 package compatibility with space-constrained PCB layouts.

Technical Context

The INA282AIDR uses a zero-drift chopper-stabilized architecture to achieve ±20 µV max input offset and 0.3 µV/°C max drift over –40°C to +125°C. Its switched-capacitor input stage enables 140 dB CMRR and supports operation with common-mode voltages extending 14 V below GND - critical for battery-reversal protection in automotive 12 V systems.

It delivers 50 V/V gain with ±1.4% max gain error, 900 µA max quiescent current, and rail-to-rail output swing (GND + 15 mV to V+ – 400 mV at 25°C). The dual reference inputs (REF1/REF2) allow flexible unidirectional or bidirectional output biasing - including ground-, V+-, or external-reference referenced configurations.

Key Specifications

Pinout & Package

INA282AIDR is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size), RoHS-compliant and rated for –40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current shunt monitor applications.

Compared with INA240AIDR and MAX4080TASA+, the INA282AIDR offers superior offset performance (±20 µV vs. ±500 µV), lower drift (0.3 µV/°C vs. 2 µV/°C), and broader temperature support (–40°C to +125°C), making it optimal for high-accuracy, thermally demanding current sensing where long-term stability is critical.

Availability

INA282AIDR is available at Aetrix Electronics and suitable for telecom power monitoring, automotive battery management, solar inverter DC-link sensing, and industrial motor drive phase current measurement requiring stable component supply and long-lifecycle support.

Supply support for INA282AIDR 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 amplifiers and current-sensing solutions.

The INA28x product line was designed specifically for high-accuracy, wide common-mode current sensing in harsh environments - targeting automotive, industrial, and renewable energy applications where reliability and parametric stability are mission-critical.

FAQ

What is the maximum common-mode voltage the INA282AIDR can tolerate?

The INA282AIDR supports a common-mode input voltage range of –14 V to +80 V. This allows safe operation during automotive battery reversal (–14 V) and load-dump transients (+80 V), eliminating the need for external protection components in most 12 V and 48 V systems. The specification is guaranteed over the full –40°C to +125°C temperature range and applies independently of the V+ supply voltage, which may be as low as 2.7 V.

Can the INA282AIDR measure bidirectional current, and how is output polarity configured?

Yes, the INA282AIDR supports bidirectional current sensing via its dual reference inputs (REF1 and REF2). By applying equal voltages to both pins - such as half the supply (V+/2) - the output centers at that voltage, allowing symmetric positive/negative current detection. Ground-referenced (unidirectional) or V+-referenced configurations are also supported. The INA282AIDR's internal reference divider ensures matched tracking between REF1 and REF2 for stable biasing.

What is the minimum shunt voltage the INA282AIDR can accurately resolve?

With ±20 µV max input offset and 50 V/V gain, the INA282AIDR achieves an effective output offset uncertainty of ±1 mV. This enables accurate full-scale measurement down to 10 mV shunt voltage - corresponding to ~0.1% full-scale error before gain error. At 25°C, typical offset is ±7 µV (±0.35 mV output), further improving resolution in controlled environments.

Does the INA282AIDR require external compensation or filtering for stable operation?

No external compensation is required. The INA282AIDR is internally compensated for unity-gain stability and drives capacitive loads up to 1 nF without oscillation. However, for high-noise environments (e.g., motor drives), a 1–10 nF capacitor from OUT to GND is recommended to suppress RF pickup. Input RC filters (e.g., 10 Ω + 1 nF) may be added at +IN/–IN if EMI is present - but must be balanced to avoid degrading CMRR.

Is the INA282AIDR pin-compatible with other devices in the INA28x family?

Yes - all INA28x devices (INA282, INA283, INA284, INA285, INA286) share identical 8-pin SOIC and VSSOP footprints and pin functions. The only differences are fixed gain (50 V/V for INA282AIDR) and minor electrical specifications (e.g., bandwidth, gain error). This allows direct substitution within the same package for gain-scaling flexibility without PCB redesign.