Texas Instruments INA186A3IDDFT

Overview

INA186A3IDDFT from Texas Instruments is a bidirectional, zero-drift current-sense amplifier with 100 V/V fixed gain, –0.2 V to +40 V common-mode input range, ±50 µV max offset voltage, and 48 µA typical quiescent current. It enables precision microamp-level current measurement in battery-powered portable electronics using low-value shunt resistors.

For engineers reviewing the INA186A3IDDFT datasheet, INA186A3IDDFT pinout, INA186A3IDDFT application, or INA186A3IDDFT equivalent, this page delivers verified package mapping (SOT-23-THIN, 8-pin DDF), confirmed enable functionality, bidirectional sensing capability via REF pin, and real-world design trade-offs versus alternatives.

Technical Context

The INA186A3IDDFT uses a capacitively coupled front-end architecture to achieve 120 dB minimum CMRR and reject DC common-mode shifts up to ±40 V independent of its 1.7–5.5 V supply. Its zero-drift topology maintains ±0.5 µV/°C max offset drift and supports unidirectional or bidirectional sensing via externally applied REF voltage.

It integrates an enable pin (pin 2) that reduces supply current to 10 nA in shutdown while placing OUT in high-impedance state-critical for intermittent monitoring in power-constrained systems. Bandwidth is 35 kHz at 100 V/V gain with 0.3 V/µs slew rate and 30 µs settling time to 1%.

Key Specifications

Pinout & Package

INA186A3IDDFT is packaged in an 8-pin SOT-23-THIN (DDF) body measuring 2.90 mm × 1.60 mm, with wettable flanks and thermal pad compatibility. The package supports bidirectional sensing and includes ENABLE and REF pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA2181A3IDDFT and MAX40016AUB+, the INA186A3IDDFT uniquely combines 100 V/V gain, ENABLE-controlled 10 nA shutdown, and REF-based bidirectional sensing in a single-channel SOT-23 package-making it optimal for portable and battery-backed current telemetry.

Availability

INA186A3IDDFT is available at Aetrix Electronics and suitable for smartphone battery management, USB-C PD charger feedback, and merchant server PSU overcurrent protection requiring stable component supply across extended production lifecycles.

Supply support for INA186A3IDDFT 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 specializing in analog and embedded processing technologies, with leadership in precision amplifiers and power management ICs.

The INA186 product line was designed for high-accuracy, low-power current sensing in space-constrained portable and infrastructure power systems-emphasizing zero-drift stability, wide common-mode operation, and enable-controlled energy efficiency.

FAQ

What is the maximum common-mode voltage supported by the INA186A3IDDFT?

The INA186A3IDDFT supports a common-mode input voltage range of –0.2 V to +40 V, independent of its 1.7–5.5 V supply voltage. This allows high-side sensing on 36-V bus rails while operating from a 1.8-V microcontroller supply. The specification is guaranteed across –40°C to +125°C and validated per TI's SBOS318B datasheet Section 6.3.

Does the INA186A3IDDFT support bidirectional current sensing, and how is it implemented?

Yes, the INA186A3IDDFT supports bidirectional current sensing via its REF pin (pin 3). Applying a mid-supply voltage (e.g., VS/2) to REF centers the output at that voltage; positive differential input yields output above REF, negative yields below. When REF is grounded, the device operates unidirectionally. This functionality is confirmed for the DDF package in TI's SBOS318B datasheet Sections 7.3.4 and 5.1.

What is the purpose of the ENABLE pin on the INA186A3IDDFT, and what happens when it is pulled low?

The ENABLE pin (pin 2) on the INA186A3IDDFT controls device power state. When driven to ≥0.7×VS, the device operates normally with 48 µA typical quiescent current. When pulled ≤0.3×VS, it enters shutdown: supply current drops to 10 nA typical and OUT enters high-impedance state. This behavior is documented in SBOS318B Sections 5.1 and 7.3.3.

What is the small-signal bandwidth and gain error specification for the INA186A3IDDFT?

The INA186A3IDDFT has a small-signal bandwidth of 35 kHz at 100 V/V gain (SBOS318B Section 6.5) and a maximum gain error of ±1% across –40°C to +125°C (Section 6.5, EG parameter). These values are measured with C_LOAD = 10 pF and define the usable frequency range and absolute accuracy for closed-loop current regulation and telemetry.

Can the INA186A3IDDFT operate from a 1.8-V supply, and what is its output swing capability at that voltage?

Yes, the INA186A3IDDFT operates from 1.7 V to 5.5 V, including 1.8-V nominal supplies. At 1.8 V, its output swings from GND+1 mV to VS–40 mV (i.e., 1.76 V), delivering >97% of full-scale range. This rail-to-rail performance is specified in SBOS318B Section 6.5 (VSP/VSN parameters) and enables high-resolution ADC interfacing in low-voltage systems.