Texas Instruments INA185A3IDRLT

Overview

INA185A3IDRLT from Texas Instruments is a bidirectional, high-precision current sense amplifier optimized for space-constrained, cost-sensitive applications. It features 100 V/V fixed gain, ±55 µV max 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. It enables accurate low-side and high-side current monitoring in motor control and battery management systems.

For engineers reviewing the INA185A3IDRLT datasheet, INA185A3IDRLT pinout, INA185A3IDRLT application, or INA185A3IDRLT equivalent, this page delivers verified specifications, validated SOT-563 package details, confirmed bidirectional sensing capability, and real-world implementation context for power electronics design.

Technical Context

The INA185A3IDRLT uses a precision matched-resistor gain network to achieve ±0.2% max gain error and 0.5 µV/°C offset drift, eliminating external gain-setting components. Its proprietary topology supports common-mode input voltages from –0.2 V to +26 V independent of supply voltage, enabling direct high-side sensing on 24-V bus rails without level-shifting.

It delivers rail-to-rail output swing (within 25 mV of VS and 3.5 mV of GND), 2 V/µs slew rate, and 40 nV/√Hz input-referred voltage noise - all while drawing only 260 µA max quiescent current. These traits make it suitable for fast-response fault detection and wide-dynamic-range current measurement in battery-powered systems.

Key Specifications

Pinout & Package

The INA185A3IDRLT is housed in a 6-pin SOT-563 package (1.6 mm × 1.6 mm × 0.55 mm), offering 39% smaller footprint than SC70 and optimized for ultra-dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3IDR and MAX40056ATA+T, the INA185A3IDRLT uniquely balances ultra-small SOT-563 footprint, 260 µA IQ, and 26-V operation - making it optimal for space- and power-limited 24-V embedded systems where neither extreme voltage nor sub-15 µV offset is required.

Availability

INA185A3IDRLT 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 INA185A3IDRLT 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 power management ICs.

The INA185 product line was designed specifically for cost-sensitive, space-constrained current sensing in industrial motor drives, battery systems, and renewable energy inverters - prioritizing accuracy, integration, and thermal robustness over general-purpose op-amp flexibility.

FAQ

What is the maximum common-mode voltage the INA185A3IDRLT can handle?

The INA185A3IDRLT 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 bus rails without external level-shifting circuitry. The specification is validated across the full –40°C to +125°C operating temperature range and applies to the exact INA185A3IDRLT variant per TI SBOS378A datasheet Section 5.3.

Does the INA185A3IDRLT support bidirectional current sensing?

Yes, the INA185A3IDRLT supports true bidirectional current sensing by applying a reference voltage to the REF pin. With VREF set to mid-supply (e.g., 2.5 V on 5-V rail), the output rises above VREF for positive current and falls below VREF for negative current. This functionality is inherent to the INA185A3IDRLT's architecture and is explicitly documented in Section 6.4.3 of the official datasheet.

What is the gain error specification for the INA185A3IDRLT?

The INA185A3IDRLT has a maximum gain error of ±0.2% over the full operating temperature range (–40°C to +125°C), as specified in Section 5.5 of the TI datasheet. This value applies specifically to A1, A2, and A3 variants - including the INA185A3IDRLT - and reflects the performance of its integrated matched-resistor gain network.

Can the INA185A3IDRLT operate from a 3.3-V supply?

Yes, the INA185A3IDRLT operates from 2.7 V to 5.5 V, fully supporting standard 3.3-V logic rails. At 3.3 V, its output swings within 25 mV of VS and 3.5 mV of GND, maintaining full rail-to-rail functionality. All electrical characteristics - including 150-kHz bandwidth and ±55 µV offset - are guaranteed across this supply range per Section 5.3.

What package does the INA185A3IDRLT use, and what are its dimensions?

The INA185A3IDRLT uses the DRL package: a 6-pin SOT-563 measuring 1.6 mm × 1.6 mm × 0.55 mm. This package occupies 2.56 mm² including pins - 39% smaller than SC70 - and is explicitly listed in TI's orderable information table for the INA185A3IDRLT part number.