Texas Instruments INA185A2IDRLT

Overview

INA185A2IDRLT from Texas Instruments is a bidirectional, high-precision current sense amplifier in a 6-pin SOT-563 package (1.6 mm × 1.6 mm), designed for space-constrained, cost-sensitive applications. It features 50 V/V fixed gain, ±55 µV max input offset voltage at 0 V common-mode, 350-kHz small-signal bandwidth, and operates from 2.7 V to 5.5 V supply across –40°C to +125°C - enabling accurate low-side and high-side current monitoring in motor control and battery management systems.

For engineers reviewing the INA185A2IDRLT datasheet, INA185A2IDRLT pinout, INA185A2IDRLT application, or INA185A2IDRLT equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The INA185A2IDRLT uses a precision current-shunt monitor architecture with an integrated matched resistor gain network - eliminating external gain-setting components and minimizing temperature-induced gain drift (max 8 ppm/°C). Its rail-to-rail output delivers 2 V/µs slew rate and supports linear operation down to 3.5 mV above GND and within 25 mV of VS.

It achieves bidirectional sensing via REF pin biasing, enabling zero-current output offset tuning; common-mode rejection exceeds 96 dB (typical) over –40°C to +125°C, and input bias current remains below 75 µA across –0.2 V to +26 V VCM range - critical for high-accuracy shunt measurements in noisy industrial power rails.

Key Specifications

Pinout & Package

INA185A2IDRLT is housed in a 6-pin SOT-563 package (1.6 mm × 1.6 mm × 0.55 mm body, 2.56 mm² total footprint), optimized for ultra-dense PCB layouts and thermal performance (RθJA = 230.9°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A2D and MAX40056ATA+T, the INA185A2IDRLT offers the smallest footprint and lowest quiescent current among 50-V/V current sense amplifiers rated for –40°C to +125°C, making it optimal for space- and power-constrained battery-powered and motor-control designs where 26-V VCM suffices.

Availability

INA185A2IDRLT is available at Aetrix Electronics and suitable for motor control, battery monitoring, and solar inverter applications requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.

Supply support for INA185A2IDRLT 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 INA185 product line was engineered specifically for cost-sensitive, space-constrained current sensing in motor drives, battery systems, and renewable energy inverters - prioritizing ultra-small packaging, low power, and high accuracy without external gain components.

FAQ

What is the maximum common-mode voltage supported by the INA185A2IDRLT?

The INA185A2IDRLT supports a common-mode input voltage range of –0.2 V to +26 V, independent of its 2.7–5.5-V supply voltage. This allows direct high-side sensing on 24-V industrial buses and low-side sensing near ground without level-shifting circuitry. The specification is validated across –40°C to +125°C and applies to all A2 variants including INA185A2IDRLT.

How does the REF pin function in bidirectional current sensing with the INA185A2IDRLT?

In bidirectional mode, the REF pin sets the zero-current output voltage level for the INA185A2IDRLT. Applying VS/2 to REF centers the output at mid-supply, enabling symmetric positive and negative current detection - e.g., +5 A yields OUT = VS/2 + 250 mV, –5 A yields OUT = VS/2 – 250 mV. The REF input must be buffered to avoid loading errors, and voltage must remain between GND and VS.

What is the typical output swing capability of the INA185A2IDRLT relative to supply rails?

The INA185A2IDRLT delivers rail-to-rail output swing: within 3.5 mV of GND and within 25 mV of VS under load (10 kΩ to GND). At 3.3-V supply, this provides >3.29-V usable range - preserving >99% of full-scale for 12-bit ADCs. Output swing is specified across –40°C to +125°C and is consistent for all A2 devices including INA185A2IDRLT.

Can the INA185A2IDRLT be used in unidirectional current sensing applications?

Yes - the INA185A2IDRLT supports unidirectional sensing by grounding the REF pin. With zero current, OUT sits near GND (≤12 mV max); positive current increases OUT linearly. For improved low-current linearity, bias REF to ≥50 mV instead of GND. This configuration is widely used in DC-DC converter output current monitoring and lighting control feedback loops.

What is the gain error specification for the INA185A2IDRLT over temperature?

The INA185A2IDRLT has a maximum gain error of ±0.2% across –40°C to +125°C, with typical drift of 1.5–8 ppm/°C. This is achieved via on-chip matched thin-film resistors, eliminating external gain-setting components and their associated temperature drift. The spec is explicitly confirmed for A2-grade devices in the official SBOS378A datasheet.