Texas Instruments INA284AID

Overview

INA284AID from Texas Instruments is a high-accuracy, zero-drift current shunt monitor IC designed for bidirectional sensing across shunt resistors in high common-mode voltage environments. It features a 500 V/V fixed gain, –14 V to +80 V input common-mode range, ±20 µV max offset voltage, and operates from a single 2.7 V to 18 V supply. It enables precise low-side and high-side current measurement in telecom power supplies and solar inverter DC-link monitoring.

For engineers reviewing the INA284AID datasheet, INA284AID pinout, INA284AID application, or INA284AID equivalent, this page delivers verified functional context, SOIC-8 package mapping, real-world use-value metrics (e.g., 10 mV full-scale shunt drop capability), and validated alternative options - all grounded in TI SBOS485C revision C specifications.

Technical Context

The INA284AID implements a zero-drift chopper-stabilized architecture with switched-capacitor input stage, enabling ultra-low offset drift (0.3 µV/°C max) and 140 dB CMRR. Its differential input structure supports bidirectional current sensing by accepting independent reference voltages on REF1 and REF2 pins, allowing output centering at any point between GND and V+ (up to 9 V).

This device uses an internal precision resistor divider network to set reference gain and reject common-mode transients; its effective bandwidth is 4 kHz due to discrete-time sampling behavior, and it tolerates rapid common-mode steps up to 80 V without latch-up when used within absolute maximum ratings.

Key Specifications

Pinout & Package

INA284AID is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with standard JEDEC MS-012AC footprint and 1.27 mm pitch. The package supports automated optical inspection and reflow soldering per IPC/JEDEC J-STD-020D.3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA284AID, INA285AID offers higher gain and lower offset for micro-shunt applications but sacrifices bandwidth; INA240AIDR trades gain for speed and EMI robustness, making it preferable in high-dV/dt motor phases but unsuitable for bidirectional reference biasing.

Availability

INA284AID 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 applications requiring stable component supply and long-term production continuity.

Supply support for INA284AID 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, specializing in analog and embedded processing technologies with over 90 years of innovation in precision signal conditioning.

The INA28x product line was developed specifically for high-accuracy, wide common-mode current sensing in power conversion, battery management, and industrial control systems - emphasizing zero-drift stability, fault resilience, and reference flexibility.

FAQ

What is the maximum common-mode voltage the INA284AID can handle?

The INA284AID supports a common-mode input voltage range of –14 V to +80 V, as specified in the absolute maximum ratings and confirmed across operating conditions in TI SBOS485C. This allows direct connection to high-side shunts in 48 V telecom systems or automotive 12 V buses during load-dump events. The device maintains functionality within this range without external level-shifting circuitry, and the specification applies to both +IN and –IN pins simultaneously.

Does the INA284AID require external components for basic operation?

No, the INA284AID operates with only a local 0.1 µF ceramic bypass capacitor on the V+ pin. Unlike many current sense amplifiers, it does not require external gain-setting resistors (gain is fixed at 500 V/V), external reference sources (REF1/REF2 accept direct DC bias), or input protection diodes - provided common-mode and differential voltage limits are respected. TI explicitly warns against adding series input resistors, as they degrade gain accuracy.

Can the INA284AID measure bidirectional current without external circuitry?

Yes, the INA284AID supports true bidirectional current measurement natively via its dual reference inputs (REF1 and REF2). By applying equal DC voltages (e.g., 2.5 V) to both pins, the output centers at that voltage when V_SENSE = 0 V; positive current raises the output, negative current lowers it. This eliminates the need for external op-amps or level-shifters required by single-reference amplifiers like the MAX4080.

What is the minimum shunt voltage the INA284AID can accurately resolve?

With ±20 µV max offset and 500 V/V gain, the INA284AID achieves ≤0.2% error at 10 mV full-scale shunt drop - meaning it can resolve currents corresponding to as little as 10 mV across the shunt resistor. This enables high-precision measurement in low-power systems where minimizing I²R loss is critical, such as battery-powered IoT sensors or energy-harvesting nodes.

Is the INA284AID pin-compatible with other devices in the INA28x family?

Yes, all INA28x devices - including INA282AID, INA283AID, INA284AID, INA285AID, and INA286AID - share identical SOIC-8 and VSSOP-8 pinouts and reference pin functionality. The only differences are gain value and bandwidth; no PCB layout changes are needed when upgrading or downgrading within the family, provided supply and load conditions remain within each device's specifications.