Texas Instruments INA181A4IDBVR

Overview

INA181A4IDBVR from Texas Instruments is a single-channel, bidirectional current-sense amplifier optimized for high-accuracy, low-power current monitoring in both high-side and low-side configurations. It features 200 V/V fixed gain, –0.2 V to +26 V input common-mode range, ±500 µV max offset at 12 V VCM, 105 kHz bandwidth, and 2 V/µs slew rate - enabling precise motor control, battery management, and solar inverter current sensing.

For engineers reviewing the INA181A4IDBVR datasheet, INA181A4IDBVR pinout, INA181A4IDBVR application, or INA181A4IDBVR equivalent, key selection criteria include its rail-to-rail output swing (within 30 mV of VS and 5 mV of GND), 260 µA max quiescent current, ±1% gain error, and compatibility with 2.7–5.5 V supply rails in space-constrained SOT-23 packages.

Technical Context

The INA181A4IDBVR employs a precision current-shunt monitor architecture with integrated matched resistor gain network, eliminating external gain-setting components and minimizing temperature-induced gain drift. Its proprietary topology enables operation with input common-mode voltages exceeding the supply rail - supporting direct connection to 24-V bus lines while powered from 3.3-V or 5-V logic supplies.

This A4 variant delivers 200 V/V gain with 105 kHz small-signal bandwidth (C_LOAD = 10 pF) and maintains ±1% gain error across –40°C to +125°C. The device uses an internal reference-independent output stage that allows bidirectional sensing via externally applied REF voltage, with output polarity directly indicating current direction relative to the sense resistor.

Key Specifications

Pinout & Package

The INA181A4IDBVR is packaged in a 6-pin SOT-23 (DBV) footprint measuring 2.90 mm × 2.80 mm, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR and MAX40056ATA+T, the INA181A4IDBVR provides the only combination of 200 V/V fixed gain, sub-500 µV offset at 12 V VCM, and <300 µA quiescent current in SOT-23 - making it optimal for cost-sensitive, space-constrained battery and motor control designs where precision at mid-range common-mode voltages is critical.

Availability

INA181A4IDBVR is available at Aetrix Electronics and suitable for motor control, battery monitoring, and solar inverter applications requiring stable component supply, extended temperature operation (–40°C to +125°C), and RoHS-compliant packaging.

Supply support for INA181A4IDBVR 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 INA181 family was designed specifically for cost-optimized, high-accuracy current sensing in industrial, automotive, and energy systems - delivering factory-trimmed gain, wide common-mode range, and low-power operation in compact packages.

FAQ

What is the maximum common-mode voltage the INA181A4IDBVR can handle?

The INA181A4IDBVR 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 operating temperature range (–40°C to +125°C) and applies to both IN+ and IN– pins simultaneously.

Does the INA181A4IDBVR require external gain-setting resistors?

No, the INA181A4IDBVR does not require external gain-setting resistors. It integrates a factory-trimmed, matched resistor network providing a fixed 200 V/V gain. This eliminates component count, reduces layout sensitivity, and ensures ±1% gain error and low temperature drift - critical for production consistency in current-sensing applications.

How does the REF pin enable bidirectional current sensing in the INA181A4IDBVR?

The REF pin on the INA181A4IDBVR sets the output voltage midpoint for bidirectional operation. When REF = V_S/2, a positive differential input (IN+ > IN–) produces V_OUT > V_S/2, while a negative differential input produces V_OUT < V_S/2. This allows a single-ended ADC to determine both magnitude and direction of current flow through the sense resistor without additional signal conditioning.

What is the typical bandwidth and slew rate of the INA181A4IDBVR?

The INA181A4IDBVR has a small-signal bandwidth of 105 kHz (with 10-pF load) and a large-signal slew rate of 2 V/µs. These specifications enable accurate capture of fast-changing currents in PWM-driven motor phases and rapid fault detection in overcurrent protection circuits - verified in TI's SBOS793H datasheet under standard test conditions.

Which package options are available for the INA181A4IDBVR?

INA181A4IDBVR is available exclusively in the 6-pin SOT-23 (DBV) package, measuring 2.90 mm × 2.80 mm. This surface-mount package supports automated pick-and-place assembly and provides thermal performance characterized at R_θJA = 198.7°C/W. The DBV variant is distinct from the SC70 (DCK) option, which carries the same electrical specs but different mechanical dimensions.