Texas Instruments INA190A4IDDFT

Overview

INA190A4IDDFT from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 200 V/V fixed gain, ±15 µV max offset voltage, and –0.2 V to +40 V common-mode input range. It operates from 1.7 V to 5.5 V supply, draws 48 µA quiescent current (typ), and features an ENABLE pin for low-power shutdown mode. It is used in high-accuracy battery charge monitoring and server PSU rail current sensing.

For engineers reviewing the INA190A4IDDFT datasheet, INA190A4IDDFT pinout, INA190A4IDDFT application, or INA190A4IDDFT equivalent, this page delivers verified specifications, package mapping to SOT-23-8 (DDF), functional pin roles, real-world use cases, and validated alternative options - all grounded in TI's SBOS863D production data sheet (November 2019 revision).

Technical Context

The INA190A4IDDFT employs a capacitively coupled front-end architecture to achieve 132 dB minimum CMRR and reject DC common-mode voltage shifts - enabling stable operation when sensing across shunts at bus voltages up to +40 V, independent of its 1.7–5.5 V supply. Its zero-drift design maintains ±15 µV max offset and 80 nV/°C max drift over –40°C to +125°C.

This variant implements bidirectional sensing via external REF pin biasing and supports both high-side and low-side configurations. The ENABLE pin (pin 2 in DDF package) reduces supply current to ≤100 nA in shutdown and places OUT in high-impedance state - critical for power-gated subsystems in portable and server applications.

Key Specifications

Pinout & Package

The INA190A4IDDFT is packaged in an 8-pin Thin SOT-23 (DDF) with body size 1.60 mm × 2.90 mm. This package includes the ENABLE pin - not present in SC70 or UQFN variants - enabling system-level power gating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA219AIDR and MAX40016AUT#T, the INA190A4IDDFT uniquely combines 1.7-V operation, ENABLE functionality, ±15-µV offset, and 200-V/V gain in a space-constrained SOT-23-8 package - making it optimal for low-voltage, power-gated, high-accuracy analog current sensing where integration and precision are prioritized over digital interface or raw speed.

Availability

INA190A4IDDFT is available at Aetrix Electronics and suitable for server power supply monitoring, USB-C battery charging, and portable medical device battery gauge applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA190A4IDDFT 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 INA190 product line was designed for high-accuracy, low-power current sensing in battery-powered, server, and industrial systems - emphasizing zero-drift performance, wide common-mode range, and enable-controlled energy efficiency.

FAQ

What is the maximum common-mode voltage the INA190A4IDDFT can handle?

The INA190A4IDDFT 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 connection to high-voltage rails such as 36-V batteries or 48-V server buses while operating from a low-voltage microcontroller domain. The specification is guaranteed across –40°C to +125°C and is validated per TI's SBOS863D datasheet Section 6.3.

Does the INA190A4IDDFT support bidirectional current sensing, and how is it implemented?

Yes, the INA190A4IDDFT supports true bidirectional current sensing via its REF pin. Applying a bias voltage (e.g., VS/2) to REF centers the output: positive differential input (IN+ > IN−) yields V_OUT > V_REF, while negative differential input yields V_OUT < V_REF. This eliminates need for external op-amps or polarity-switching circuitry. The INA190A4IDDFT's rail-to-rail output and low offset ensure symmetric accuracy in both directions.

What is the purpose of the ENABLE pin on the INA190A4IDDFT, and what happens when it is grounded?

The ENABLE pin (pin 2 in DDF package) controls power state: driven to VS, the INA190A4IDDFT operates normally (48 µA IQ typ); driven to GND, it enters shutdown mode with ≤100 nA supply current and places the OUT pin in high-impedance state. This feature is essential for duty-cycled monitoring in battery-powered systems. Note: ENABLE is only available in DDF and RSW packages - not in SC70 variants.

Can the INA190A4IDDFT operate from a 1.8-V supply, and what performance trade-offs occur?

Yes, the INA190A4IDDFT is fully specified from 1.7 V to 5.5 V, including at 1.8 V. At 1.8 V, it maintains 33 kHz bandwidth, ±15 µV offset, and rail-to-rail output swing (GND +1 mV to VS −40 mV). Quiescent current remains 48 µA (typ), and CMRR stays ≥132 dB. No performance degradation occurs - making it ideal for ultra-low-voltage IoT and wearable applications where other current-sense amps fail to start or lose accuracy.

How does the low input bias current (0.5 nA) of the INA190A4IDDFT improve system design?

The 0.5 nA typical input bias current of the INA190A4IDDFT enables use of high-impedance RC filters (e.g., 1 MΩ/100 nF) on IN+ and IN− without introducing significant offset or gain error - unlike conventional amplifiers with µA-level bias. This improves EMI immunity in noisy environments (e.g., near DC-DC converters) while preserving bandwidth and accuracy, eliminating need for costly shielding or complex compensation networks in the INA190A4IDDFT signal path.