Texas Instruments INA186A4IYFDR

Overview

INA186A4IYFDR from Texas Instruments is a bidirectional, zero-drift current-sense amplifier with 200 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 monitoring in battery-powered consumer electronics using a DSBGA-6 (YFD) package with ENABLE pin.

For engineers reviewing the INA186A4IYFDR datasheet, INA186A4IYFDR pinout, INA186A4IYFDR application, or INA186A4IYFDR equivalent, key selection factors include its 200 V/V gain accuracy (±1% max), bidirectional sensing capability via REF pin (not present in YFD), low 500 pA typical input bias current, and operation from 1.7 V to 5.5 V supply - critical for smartphone and notebook power rail monitoring.

Technical Context

The INA186A4IYFDR 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 supply voltage. Its zero-drift design ensures 0.5 µV/°C max offset drift and supports unidirectional current sensing with internal REF node grounded.

This variant integrates an ENABLE pin (pin B3) that reduces supply current to 10 nA typical when driven low, placing OUT in high-impedance state. It delivers 33 kHz small-signal bandwidth at 200 V/V gain with rail-to-rail output swing (GND +1 mV / VS –40 mV) under 10 kΩ load.

Key Specifications

Pinout & Package

INA186A4IYFDR is packaged in a 1.17 mm × 0.765 mm, 6-ball DSBGA (YFD) with bottom-side thermal pad. This ultra-compact package supports automated placement in space-constrained mobile PCBs and provides 141.4°C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA186A4IYFDR, INA219BIDR trades analog simplicity for digital configurability and telemetry, while MAX40016AUT+T offers superior drift performance but sacrifices enable control and low-voltage operation - making INA186A4IYFDR optimal for battery-constrained, analog-feedback systems requiring periodic wake-up.

Availability

INA186A4IYFDR is available at Aetrix Electronics and suitable for smartphone power management, notebook PC battery monitoring, and consumer battery charger designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA186A4IYFDR 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 is designed for high-accuracy, low-power current sensing in portable and infrastructure power systems - targeting applications where wide VCM, microamp resolution, and minimal supply current are essential.

FAQ

What is the function of the ENABLE pin on the INA186A4IYFDR?

The ENABLE pin (ball B3) on the INA186A4IYFDR is an active-high digital control input that powers down the device when pulled low, reducing quiescent current to 10 nA typical and placing the OUT pin in high-impedance state. When driven to VS, the INA186A4IYFDR operates normally with 48 µA typical IQ. This feature enables duty-cycled current monitoring in battery-powered systems without external switch circuitry.

Does the INA186A4IYFDR support bidirectional current sensing?

No - the INA186A4IYFDR in the YFD (DSBGA-6) package does not include a dedicated REF pin; its REF node is internally grounded. Therefore, it supports only unidirectional current sensing. Bidirectional operation requires external REF voltage injection, which is only available on DCK (SC70) and DDF (SOT-23) variants. The INA186A4IYFDR outputs zero-scaled voltage proportional to (IN+ – IN–) × 200, referenced to GND.

What is the maximum common-mode voltage the INA186A4IYFDR can handle?

The INA186A4IYFDR 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 direct high-side sensing on 36-V rails (e.g., server PSUs) and low-side sensing near ground without level-shifting. The absolute maximum rating is ±42 V differential and 42 V with respect to GND, but operation beyond +40 V or below –0.2 V is outside specified performance limits.

Can the INA186A4IYFDR operate from a 1.8-V supply?

Yes - the INA186A4IYFDR is fully specified for operation from 1.7 V to 5.5 V supply. At 1.8 V, it maintains 48 µA typical quiescent current, ±50 µV max offset voltage, and rail-to-rail output swing (GND +1 mV / VS –40 mV), enabling direct interface with 1.8-V microcontrollers and ADCs. Output swing remains linear down to 1.8 V, preserving dynamic range in ultra-low-voltage portable designs.

What shunt resistor value is recommended for use with the INA186A4IYFDR?

For optimal performance with the INA186A4IYFDR's 200 V/V gain, a 5 mΩ shunt yields 1 V output per 1 A sensed current, fitting within 0–1.8 V ADC range at 1.8-V supply. Lower values (e.g., 1 mΩ) reduce power loss but require higher currents for measurable output; higher values (e.g., 50 mΩ) improve µA-resolution but increase I²R loss. The 500 pA input bias current allows use of ≥10 Ω shunts for sub-µA detection, though thermal noise and layout parasitics must be managed.