INA190A1NDDFREP

Overview

The INA190A1NDDFREP is a bidirectional, low-power, zero-drift current sense amplifier from the enhanced product (EP) series. It operates on a single supply voltage ranging from 1.7 V to 5.5 V and supports common-mode voltages from -0.2 V to +40 V. The device features a fixed gain of 25 V/V, a maximum gain error of ±0.2%, and a minimum common-mode rejection ratio of 132 dB. It includes an enable pin that reduces quiescent current to less than 0.1 µA when disabled. The component is housed in an SOT-23-THIN-8 package and is rated for an operating temperature range of -55°C to +150°C.

Feature Summary

• Zero-drift architecture ensures high precision with low offset voltage and drift across extreme temperatures.
• Capacitively coupled input stage provides ultra-low input bias current for accurate microamp-level measurements.
• Integrated digital enable pin allows deep power-down mode with minimal leakage current.
• Bidirectional sensing capability via external reference voltage application.

Applications

• Avionics systems
• Radar systems
• Smart munitions

Procurement Notes

Verify the specific ordering suffix 'DDFREP' corresponds to the SOT-23-THIN-8 package and tape-and-reel packaging format. Confirm the 'EP' designation indicates the controlled baseline and extended lifecycle status required for defense or aerospace qualification. Ensure the datasheet revision matches the design-in requirements for the -55°C to +150°C temperature range.

Selection Notes

Select this variant for applications requiring a 25 V/V gain and operation within the -55°C to +150°C industrial/military temperature range. The low input bias current makes it suitable for high-impedance shunt sensing. Consider the enable pin functionality if system power management requires periodic shutdown. Verify that the 40 V common-mode voltage range aligns with the bus voltage specifications of the target circuit.

Part Context

This component belongs to the INA190-EP family of current sense amplifiers designed for ruggedized environments. The EP series offers controlled baselines, single assembly/fabrication sites, and extended product change notifications. It shares architectural similarities with standard INA190 devices but is qualified for higher reliability standards and wider temperature extremes.

Replacement Considerations

INA190A1QDCKRQ1G4: Automotive grade alternative with AEC-Q100 qualification and SC-70-6 package.

FAQ

How does the INA190A1NDDFREP achieve bidirectional current sensing?

It utilizes an external reference voltage applied to the REF pin. Positive differential inputs produce outputs above this reference, while negative inputs produce outputs below it.

What is the impact of the enable pin on power consumption?

Driving the ENABLE pin to GND disables the device, reducing the typical supply current to less than 0.1 µA and placing the output in a high-impedance state.