Texas Instruments INA190A1NDDFREP

Overview

INA190A1NDDFREP from Texas Instruments is a radiation-tolerant, bidirectional current-sense amplifier with zero-drift architecture, 25 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 only 50 µA typical quiescent current, and enables microamp-level current measurement in avionics power monitoring.

For engineers reviewing the INA190A1NDDFREP datasheet, INA190A1NDDFREP pinout, INA190A1NDDFREP application, or INA190A1NDDFREP equivalent, this page delivers verified electrical specs, SOT-23-8 pin functions, EP-grade temperature performance (–55°C to +150°C), bidirectional sensing implementation details, and validated alternative parts for defense-grade current sensing designs.

Technical Context

The INA190A1NDDFREP uses a capacitively coupled front-end amplifier followed by a difference amplifier output stage to achieve ultra-low input bias current (±0.5 nA typ) and high DC common-mode rejection (132 dB min). Its zero-drift architecture ensures stable offset (±15 µV max) and low drift (80 nV/°C max) across the full military temperature range.

This device supports both high-side and low-side sensing independent of supply voltage - common-mode voltage (–0.2 V to +40 V) exceeds VS (1.7 V to 5.5 V) - and features an enable pin that reduces supply current to <0.1 µA in shutdown while placing OUT in high-impedance state.

Key Specifications

Pinout & Package

SOT-23-8 (DDF) package: 1.60 mm × 2.90 mm body, 0.65 mm pitch, surface-mount, thermally enhanced for high-reliability PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA190A1NDDFREP, the INA240A1QPWRQ1 offers automotive robustness but omits enable control and military temperature support, while the INA185A1IDDFR provides identical gain and footprint at lower cost but forfeits EP-grade reliability, extended temp operation, and ultra-low IQ - making INA190A1NDDFREP irreplaceable for mission-critical defense current sensing.

Availability

INA190A1NDDFREP is available at Aetrix Electronics and suitable for avionics power monitoring, radar system diagnostics, and smart munitions firing circuits requiring stable component supply under extended temperature and radiation-hardened conditions.

Supply support for INA190A1NDDFREP 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 precision amplifiers and space-grade components.

The INA190-EP product line was engineered specifically for defense, aerospace, and medical systems demanding extended temperature operation, controlled manufacturing baselines, and full product lifecycle traceability - directly addressing MIL-PRF-38535 Class K requirements.

FAQ

What is the maximum common-mode voltage supported by the INA190A1NDDFREP?

The INA190A1NDDFREP 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 enables reliable high-side sensing on 28 V or 40 V aircraft buses without level-shifting circuitry. The specification is guaranteed across the full –55°C to +150°C operating temperature range, and is validated per SBOSA74 datasheet Section 6.3.

Does the INA190A1NDDFREP support bidirectional current sensing, and how is it implemented?

Yes, the INA190A1NDDFREP supports bidirectional current sensing via its REF pin. Applying a mid-supply voltage (e.g., VS/2) to REF centers the output at that voltage: positive differential input yields OUT > VREF, negative yields OUT < VREF. This configuration is explicitly documented in Section 7.3.4 and Figure 7-3 of the SBOSA74 datasheet, and requires no external components beyond the reference source.

What is the gain error specification for the INA190A1NDDFREP, and how does it impact measurement accuracy?

The INA190A1NDDFREP has a gain error of ±0.2% maximum at 25°C, with a drift of 7 ppm/°C maximum. At full-scale output, this translates to ≤0.2% absolute current measurement error due to gain tolerance alone. When combined with ±15 µV offset, total error remains <0.3% across –55°C to +150°C per TI's production characterization data in Figures 6-5 and 6-8.

How does the ENABLE pin function, and what is its leakage behavior?

The ENABLE pin places the INA190A1NDDFREP in active mode when driven ≥0.7×VS, and shutdown mode when ≤0.3×VS. In shutdown, supply current drops to <0.1 µA (100 nA typical), and OUT enters high-impedance state. Input leakage on ENABLE is ≤100 nA across –55°C to +150°C, per Electrical Characteristics Table 6.5, ensuring compatibility with open-drain MCU GPIOs.

Is the INA190A1NDDFREP pin-compatible with other variants in the INA190-EP family?

Yes, all INA190-EP variants - including INA190A1NDDFREP, INA190A2NDDFREP, and up to INA190A5NDDFREP - share identical SOT-23-8 (DDF) packaging and pinout. Gain is factory-set and non-configurable; substitution requires only validation of signal chain gain budget, as electrical characteristics (offset, CMRR, bandwidth) scale predictably with gain per Table 6.5.