Texas Instruments INA185A1IDRLT

Overview

INA185A1IDRLT from Texas Instruments is a bidirectional, high-precision current-sense amplifier in a 1.6 mm × 1.6 mm SOT-563 package, designed for space-constrained high-side and low-side sensing. It delivers 20 V/V fixed gain, ±55 µV max offset at 0 V common-mode, 350 kHz bandwidth, and operates from 2.7 V to 5.5 V supply across –40°C to +125°C - enabling accurate motor phase current monitoring in compact industrial drives.

For engineers reviewing the INA185A1IDRLT datasheet, INA185A1IDRLT pinout, INA185A1IDRLT application, or INA185A1IDRLT equivalent, this page provides verified specifications, validated SOT-563 pin functions, real-world use cases in battery management and solar inverters, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The INA185A1IDRLT uses a precision matched-resistor gain network (20 V/V) to minimize gain error drift and achieve ±0.2% max gain error over temperature. 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 features 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 noise - optimized for fast transient response in closed-loop motor control and fault detection circuits where sub-millisecond current step fidelity is required.

Key Specifications

Pinout & Package

SOT-563 (DRL) package: 1.6 mm × 1.6 mm × 0.55 mm body, 6-pin ultra-small footprint with 0.5-mm pitch; thermally enhanced for PCB-mounted power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1D and MAX40056ATA+T, the INA185A1IDRLT uniquely balances ultra-small SOT-563 size, full industrial temperature range, and 350-kHz bandwidth - making it optimal for space-constrained 24-V motor drives and solar microinverters where thermal performance and layout density are critical.

Availability

INA185A1IDRLT is available at Aetrix Electronics and suitable for motor control, battery monitoring, and solar inverter applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for INA185A1IDRLT 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 high-accuracy, space-constrained current sensing in industrial motor drives, battery systems, and renewable energy equipment - prioritizing small footprint, wide common-mode range, and robust thermal performance.

FAQ

What is the maximum common-mode voltage the INA185A1IDRLT can handle?

The INA185A1IDRLT 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 without external level-shifting circuitry. The specification is validated across the full –40°C to +125°C temperature range and applies to the exact INA185A1IDRLT variant per TI SBOS378A datasheet Section 5.3.

Does the INA185A1IDRLT support bidirectional current sensing?

Yes, the INA185A1IDRLT supports bidirectional current sensing via its REF pin. When a mid-supply voltage (e.g., VS/2) is applied to REF, the output swings above REF for positive current and below REF for negative current. This functionality is inherent to the INA185A1IDRLT's architecture and is explicitly confirmed in Section 6.4.3 of the official datasheet for the A1 gain variant.

What is the gain error specification for the INA185A1IDRLT over temperature?

The INA185A1IDRLT has a maximum gain error of ±0.2% over the full operating temperature range of –40°C to +125°C, as specified in Section 5.5 of the TI datasheet. Gain error drift is further limited to 1.5 ppm/°C, ensuring minimal variation across thermal cycles in industrial environments.

Can the INA185A1IDRLT be used in low-side sensing configurations?

Yes, the INA185A1IDRLT is fully supported for low-side current sensing. Its –0.2 V minimum common-mode voltage enables connection to ground-referenced shunts, and its ±55 µV max offset at 0 V VCM ensures high accuracy for low-current measurements. The device's rail-to-rail output and 20 V/V gain simplify interface with standard 3.3-V ADCs in low-side topologies.

What package does the INA185A1IDRLT use, and what are its dimensions?

The INA185A1IDRLT uses the SOT-563 (DRL) package: a 6-pin, ultra-small outline transistor package measuring 1.6 mm × 1.6 mm × 0.55 mm with 0.5-mm lead pitch. This footprint is 39% smaller than SC70 and occupies only 2.56 mm² including pins - confirmed in TI's Package Information table and Mechanical Drawing SLMS202.