Texas Instruments INA190A3NDDFREP

Overview

INA190A3NDDFREP from Texas Instruments is a radiation-tolerant, bidirectional, zero-drift current-sense amplifier with 100 V/V fixed gain, ±15 µV max offset voltage, and –0.2 V to +40 V wide common-mode input range. It operates from 1.7 V to 5.5 V supply, draws only 50 µA typical quiescent current when enabled, and supports precision microamp-level current measurement in avionics power monitoring and radar system overcurrent protection.

For engineers reviewing the INA190A3NDDFREP datasheet, INA190A3NDDFREP pinout, INA190A3NDDFREP application, or INA190A3NDDFREP equivalent, this page delivers verified electrical specs, SOT-23-8 pin functions, EP-grade thermal and reliability data, and validated alternatives for defense-grade current sensing designs requiring operation from –55°C to +150°C.

Technical Context

The INA190A3NDDFREP uses a capacitively coupled front-end architecture to achieve 132 dB minimum CMRR and block DC common-mode voltages-enabling accurate sensing at bus voltages up to +40 V independent of its 1.7–5.5 V supply rail. Its zero-drift core ensures <80 nV/°C offset drift and maintains ±0.3% gain error across –55°C to +150°C.

Bidirectional operation is implemented via the REF pin: applying a mid-supply reference enables symmetric output swing around VREF for both positive and negative differential inputs. The ENABLE pin reduces supply current to <100 nA in shutdown while placing OUT in high-impedance state-critical for intermittent monitoring in battery-constrained aerospace subsystems.

Key Specifications

Pinout & Package

SOT-23-8 (DDF) package: 1.60 mm × 2.90 mm body, 0.95 mm max height, lead pitch 0.65 mm-designed for high-density PCB layouts in space-constrained flight control units.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA190A3NDDFREP, the INA240A3QPWRQ1 offers higher gain but lacks radiation hardening and extreme temperature support, while the MAX40016AUB+ trades EP reliability for smaller package and lower cost-neither provides the same combination of –55°C to +150°C operation, 132 dB CMRR, and TI's defense-grade manufacturing controls.

Availability

INA190A3NDDFREP is available at Aetrix Electronics and suitable for avionics power monitoring, radar transmitter protection, and smart munitions telemetry requiring stable component supply across extended product lifecycles and harsh environmental conditions.

Supply support for INA190A3NDDFREP 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 heritage in high-reliability aerospace and defense components.

The INA190-EP product line was engineered specifically for mission-critical systems requiring extended temperature operation, radiation tolerance, and full traceability-targeting avionics, radar, and guided weapons platforms.

FAQ

What is the maximum common-mode voltage the INA190A3NDDFREP can handle?

The INA190A3NDDFREP supports a common-mode input 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 28 V MIL-STD-704 aircraft buses and 40 V radar transmitter rails without external level-shifting circuitry. The specification is guaranteed across the full –55°C to +150°C operating temperature range.

Does the INA190A3NDDFREP support bidirectional current sensing?

Yes, the INA190A3NDDFREP supports bidirectional current sensing via its REF pin. Applying a reference voltage (e.g., VS/2) to REF centers the output voltage, enabling positive differential inputs to raise OUT above VREF and negative inputs to lower OUT below VREF. This capability is explicitly validated in the datasheet for all gain variants including INA190A3NDDFREP.

What is the gain error specification for the INA190A3NDDFREP?

The INA190A3NDDFREP has a maximum gain error of ±0.3% across temperature (–55°C to +150°C), as specified for A3 devices in the Electrical Characteristics table. At 25°C, the typical gain error is ±0.06%, and gain drift is limited to 7 ppm/°C maximum-ensuring stable scaling for precision current measurement in flight-critical subsystems.

How does the ENABLE pin function on the INA190A3NDDFREP?

The ENABLE pin on the INA190A3NDDFREP controls device power state: driving it to VS enables normal operation with 50 µA typical quiescent current, while pulling it to GND disables the amplifier, reducing supply current to <100 nA and placing the OUT pin in high-impedance state. This feature is fully characterized across –55°C to +150°C and supports low-duty-cycle monitoring in battery-powered munitions.

Is the INA190A3NDDFREP compatible with low-voltage microcontrollers?

Yes, the INA190A3NDDFREP operates from 1.7 V to 5.5 V and features rail-to-rail output swing-delivering linear output down to GND + 1 mV and up to VS – 40 mV. This allows direct interface with 1.8 V FPGA I/O banks and low-voltage ARM Cortex-M MCUs without level-shifting, preserving signal fidelity in compact avionics modules.