Texas Instruments INA181A1IDBVT

Overview

INA181A1IDBVT from Texas Instruments is a single-channel, bidirectional current-sense amplifier optimized for high-accuracy, low-power, low- and high-side sensing in 2.7–5.5 V systems. It features 20 V/V fixed gain, ±150 µV max offset at 0 V common-mode, 350 kHz bandwidth, and –0.2 V to +26 V input common-mode range - enabling precise motor control and battery monitoring where bus voltage exceeds supply rail.

For engineers reviewing the INA181A1IDBVT datasheet, INA181A1IDBVT pinout, INA181A1IDBVT application, or INA181A1IDBVT equivalent, this page delivers verified specifications, SOT-23-6 pin mapping, real-world use cases in power management and solar inverters, and two confirmed alternative parts with documented functional and application differences.

Technical Context

The INA181A1IDBVT employs a precision current-sense topology with integrated matched resistor network for 20 V/V gain, eliminating external gain-setting components and minimizing temperature drift (≤1 µV/°C offset drift). Its input stage operates independently of VS, allowing accurate sensing at VCM = –0.2 V to +26 V while powered from only 2.7–5.5 V.

It supports bidirectional operation via REF pin biasing, delivers rail-to-rail output swing (within 30 mV of VS and 5 mV of GND), and maintains ±1% max gain error across –40°C to +125°C - making it suitable for closed-loop current feedback in motor drives and fault-detection circuits requiring fast transient response (2 V/µs slew rate).

Key Specifications

Pinout & Package

The INA181A1IDBVT is packaged in a 6-pin SOT-23 (DBV) measuring 2.90 mm × 2.80 mm, with exposed pad optional for thermal enhancement.

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 INA181A1IDBVT offers optimal balance of ultra-low quiescent current (260 µA), extended temperature range (–40°C to +125°C), and SOT-23-6 compatibility for cost-sensitive, thermally demanding applications like solar microinverters and automotive body controllers - without sacrificing 20-V/V precision or 350-kHz responsiveness.

Availability

INA181A1IDBVT 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 traceable sourcing for production ramp-up.

Supply support for INA181A1IDBVT 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The INA181 family targets cost-optimized, high-accuracy current sensing in space- and power-constrained systems - designed specifically for bidirectional, low-/high-side shunt monitoring with minimal external components and guaranteed performance across harsh temperature ranges.

FAQ

What is the maximum common-mode voltage supported by the INA181A1IDBVT?

The INA181A1IDBVT 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 –40°C to +125°C and applies to both IN+ and IN– pins simultaneously.

Can the INA181A1IDBVT be used for bidirectional current sensing, and how is it configured?

Yes, the INA181A1IDBVT supports bidirectional current sensing by applying a reference voltage (e.g., VS/2) to the REF pin. A positive differential input (IN+ > IN–) produces an output above REF; a negative differential input produces an output below REF. This configuration is explicitly validated in TI's SBOS793H datasheet Figure 7-4 and Equation 1 for the INA181A1IDBVT.

What is the gain accuracy and temperature drift of the INA181A1IDBVT?

The INA181A1IDBVT has a fixed 20 V/V gain with ±1% maximum gain error over –40°C to +125°C, and gain error drift of ≤20 ppm/°C. Its offset voltage is ±150 µV maximum at 0 V common-mode and ±500 µV maximum at 12 V common-mode, with offset drift ≤1 µV/°C - all values specified and tested per SBOS793H Section 6.5.

Which package does the INA181A1IDBVT use, and what are its key mechanical dimensions?

The INA181A1IDBVT uses the DBV package: a 6-pin SOT-23 measuring 2.90 mm × 2.80 mm (length × width including pins). This package is distinct from the DCK (SC70) variant and is fully specified in TI's SBOS793H Section 11. Thermal resistance is RθJA = 198.7°C/W, and the device is rated for reflow soldering per JEDEC J-STD-020.

Does the INA181A1IDBVT require external gain-setting resistors?

No, the INA181A1IDBVT integrates a precision-matched internal resistor network for its 20 V/V gain. This eliminates external gain components, reduces board area, avoids resistor tolerance and thermal drift errors, and ensures consistent performance across units and temperatures - as confirmed in SBOS793H Section 3 and Table 4-1.