Texas Instruments INA190A3IDDFR

Overview

INA190A3IDDFR from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 100 V/V fixed gain, ±15 µV max offset voltage, 132 dB min CMRR, and –0.2 V to +40 V wide common-mode input range. It operates from 1.7 V to 5.5 V supply, draws 48 µA typical quiescent current, and features an ENABLE pin for low-power shutdown mode-used in battery-powered load monitoring and overcurrent protection circuits.

For engineers reviewing the INA190A3IDDFR datasheet, INA190A3IDDFR pinout, INA190A3IDDFR application, or INA190A3IDDFR equivalent, this device supports high-accuracy microamp-to-amp current sensing in space-constrained, low-voltage systems requiring rail-to-rail output swing, bidirectional capability, and <100 nA shutdown current.

Technical Context

The INA190A3IDDFR employs a capacitively coupled front-end architecture to achieve ultra-low input bias current (0.5 nA typ) and high DC common-mode rejection (132 dB min), enabling stable operation across –0.2 V to +40 V common-mode voltages 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 fixed 100 V/V gain with ±0.3% max gain error and 35 kHz small-signal bandwidth (C_LOAD = 10 pF). The ENABLE pin (Pin 2 in DDF package) controls functional state: when pulled to VS, it enables full operation with 48 µA IQ; when pulled to GND, output enters high-Z state and supply current drops to ≤100 nA.

Key Specifications

Pinout & Package

The INA190A3IDDFR is housed in an 8-pin Thin SOT-23 (DDF) package measuring 1.60 mm × 2.90 mm, with exposed thermal pad for enhanced power dissipation. Pin 1 is marked via dot; pin numbering follows standard SOT-23 counterclockwise from the mark.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA219BIDR and MAX4008AUA+T, the INA190A3IDDFR uniquely combines analog output, ENABLE control, 0.5 nA input bias, and –40°C to +125°C operation in a 2.9 mm × 1.6 mm SOT-23 package-making it optimal for compact, low-power, high-accuracy analog current sensing where firmware overhead or layout area must be minimized.

Availability

INA190A3IDDFR is available at Aetrix Electronics and suitable for smartphone battery management, server PSU overcurrent protection, and USB-C PD portable charger designs requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for INA190A3IDDFR 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 delivers ultra-low-bias, zero-drift current-sense amplifiers optimized for high-accuracy, low-power, wide common-mode applications in portable electronics, datacenter infrastructure, and industrial sensing.

FAQ

What is the maximum common-mode voltage the INA190A3IDDFR can handle?

The INA190A3IDDFR 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 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.

Does the INA190A3IDDFR require external passive components for stable operation?

Yes-the INA190A3IDDFR requires a 0.1 µF ceramic bypass capacitor between VS and GND, placed within 2 mm of the pins. No external gain-setting resistors are needed (fixed 100 V/V), and no input filtering is mandatory-but RC filters may be added at IN+/IN− without accuracy penalty due to its 0.5 nA input bias current.

How does the ENABLE pin affect output behavior in shutdown mode?

When the ENABLE pin of the INA190A3IDDFR is driven to GND, the device enters shutdown mode: supply current drops to ≤100 nA, and the OUT pin transitions to a high-impedance state-neither sourcing nor sinking current. This prevents loading of downstream circuitry and eliminates output contention in multiplexed analog signal paths.

Can the INA190A3IDDFR measure bidirectional current with a single supply?

Yes-the INA190A3IDDFR supports true bidirectional current sensing using only a single 1.7–5.5 V supply. By applying a reference voltage (e.g., VS/2 = 2.5 V) to the REF pin, the output centers at that voltage: positive differential input yields V_OUT > V_REF, negative yields V_OUT < V_REF. No dual supplies or level translators are required.

What is the typical output swing capability of the INA190A3IDDFR at 1.8 V supply?

At VS = 1.8 V, the INA190A3IDDFR delivers rail-to-rail output swing: minimum V_OUT = GND + 1 mV and maximum V_OUT = VS – 40 mV (i.e., 1.76 V). This 1.759 V usable range preserves >97% of full-scale dynamic range for 12-bit ADC interfacing, critical in low-voltage portable applications.