Texas Instruments INA190A4NDDFREP

Overview

INA190A4NDDFREP from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 200 V/V fixed gain, –0.2 V to +40 V common-mode input range, ±15 µV max offset voltage, and 132 dB minimum CMRR. It operates from 1.7 V to 5.5 V supply, draws 50 µA typical quiescent current when enabled, and supports aerospace-grade operation from –55°C to +150°C. It enables microamp-level current measurement in high-reliability avionics power monitoring.

For engineers reviewing the INA190A4NDDFREP datasheet, INA190A4NDDFREP pinout, INA190A4NDDFREP application, or INA190A4NDDFREP equivalent, key selection factors include its 200 V/V gain accuracy (±0.3% max), low 500 pA typical input bias current, rail-to-rail output swing (VS – 40 mV / GND + 1 mV), enable-controlled 0.1 µA shutdown current, and SOT-23-8 package compatibility with space-constrained ruggedized systems.

Technical Context

The INA190A4NDDFREP employs a capacitively coupled front-end architecture to achieve high DC common-mode rejection (132 dB min) independent of supply voltage, enabling accurate sensing at bus voltages up to +40 V while powered from as low as 1.7 V. Its zero-drift design maintains ±15 µV max offset and 80 nV/°C max drift across –55°C to +150°C.

Bidirectional operation is implemented via the REF pin, which sets output centerpoint voltage; differential input signals above/below zero produce corresponding output excursions relative to REF. The device enters high-impedance output state and draws ≤0.1 µA when ENABLE is pulled to GND, supporting duty-cycled current monitoring in low-power embedded systems.

Key Specifications

Pinout & Package

SOT-23-8 (DDF) package, 1.60 mm × 2.90 mm body size, 0.65 mm pitch, thermally enhanced for high-reliability operation in extended temperature environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A4D and MAX40016AUB+, the INA190A4NDDFREP delivers superior offset stability (±15 µV vs. ±100 µV) and extended temperature qualification (–55°C to +150°C), making it the only option qualified for mission-critical defense electronics where parametric drift over thermal cycling must be minimized.

Availability

INA190A4NDDFREP is available at Aetrix Electronics and suitable for avionics power distribution, radar transmitter health monitoring, and smart munitions actuation requiring stable component supply across extended temperature and long product lifecycles.

Supply support for INA190A4NDDFREP 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 company specializing in analog and embedded processing technologies, with leadership in precision analog signal chains and high-reliability aerospace components.

The INA190-EP product line delivers radiation-tolerant, extended-temperature current-sense amplifiers for defense, aerospace, and medical systems where failure is not an option-designed specifically for high-accuracy, low-power, bidirectional current measurement in harsh environments.

FAQ

What is the maximum common-mode voltage the INA190A4NDDFREP can handle?

The INA190A4NDDFREP supports a common-mode input voltage range of –0.2 V to +40 V, independent of its 1.7-V to 5.5-V supply voltage. This allows direct high-side sensing on 36-V battery systems without level-shifting circuitry. The specification is guaranteed across the full –55°C to +150°C operating temperature range, and the device maintains 132 dB minimum CMRR even at the extremes of this range. This capability is critical for avionics power bus monitoring where transient spikes exceed nominal rail voltage.

How does the ENABLE pin affect power consumption and output behavior of the INA190A4NDDFREP?

When ENABLE is pulled to GND, the INA190A4NDDFREP enters shutdown mode, drawing ≤0.1 µA supply current and placing the OUT pin in a high-impedance state. When ENABLE is tied to VS, the device operates normally with 50 µA typical quiescent current and full analog output functionality. This feature enables duty-cycled current monitoring in battery-powered munitions telemetry systems. The transition time from disable to enable is under 100 µs, allowing rapid wake-up for event-triggered measurements without significant latency.

Can the INA190A4NDDFREP be used for bidirectional current sensing, and how is it configured?

Yes, the INA190A4NDDFREP supports bidirectional current sensing via the REF pin. To configure bidirectional operation, apply a mid-supply voltage (e.g., VS/2) to REF; then positive differential input (IN+ > IN−) produces OUT > REF, and negative differential input produces OUT < REF. For unidirectional use, ground REF. The device's 200 V/V gain and ±15 µV offset ensure accurate resolution of both charge and discharge currents in radar T/R module power stages. External buffering of REF is recommended to maintain CMRR.

What is the gain error specification for the INA190A4NDDFREP, and how does it impact measurement accuracy?

The INA190A4NDDFREP has a maximum gain error of ±0.3% across temperature, with 7 ppm/°C max gain drift. At 25°C, typical gain error is ±0.06%. This means that for a 100-mV shunt voltage input, the output will be 20 V ±60 mV (200×). Gain error dominates total measurement uncertainty at high current levels, while offset voltage dominates at low currents. The tight gain tolerance enables system-level calibration with single-point correction, reducing factory test time in high-volume avionics harness assemblies.

Is the INA190A4NDDFREP compatible with standard SOT-23-8 PCB footprints, and what thermal considerations apply?

Yes, the INA190A4NDDFREP uses the industry-standard SOT-23-8 (DDF) package with 1.60 mm × 2.90 mm body size and 0.65 mm pitch, compatible with automated placement and reflow processes. Its junction-to-board thermal resistance is 84.3°C/W, so copper pour under the exposed pad (if present) and thermal vias are recommended for sustained operation at +150°C ambient. The device's 164.6°C/W junction-to-ambient rating assumes standard JEDEC 2S2P test board; derating is required above 85°C ambient in enclosed enclosures per MIL-STD-780 reliability predictions.