INA190A3NDDFREP

Overview

The Texas Instruments INA190A3NDDFREP is a bidirectional, low-power, zero-drift current sense amplifier with an enable pin. It features a fixed gain of 100 V/V and operates from a single supply voltage ranging from 1.7 V to 5.5 V. The device supports common-mode voltages from -0.2 V to +40 V. Key electrical specifications include a maximum offset voltage of ±15 µV, a minimum common-mode rejection ratio of 132 dB, and a typical quiescent current of 50 µA. It is housed in an 8-pin SOT-23-THIN package.

Feature Summary

• Zero-drift architecture ensures high precision with minimal offset voltage drift over temperature.
• Capacitively coupled input stage provides extremely low input bias currents for accurate microamp-level measurements.
• Integrated enable pin allows the device to enter a low-power disabled state with reduced supply current.
• Bidirectional sensing capability enables monitoring of current flow in both directions via the reference pin.

Applications

• Avionics systems
• Radar systems
• Smart munitions

Procurement Notes

Verify that the specific part number matches the enhanced product (EP) designation required for your application. Confirm that the component meets the necessary defense, aerospace, or medical qualification standards. Ensure the ordering suffix corresponds to the correct tape-and-reel packaging format. Cross-reference the datasheet revision history to confirm the document version aligns with your design requirements.

Selection Notes

Select this component when high accuracy and low power consumption are critical. The 100 V/V gain option is suitable for applications requiring moderate signal amplification. Consider the wide common-mode voltage range if sensing is performed on high-side rails. Verify that the operating temperature range of -55°C to +150°C fits the environmental constraints of the target system.

Part Context

This device belongs to the INA190-EP series, which is designed specifically for rugged environments. It offers controlled baseline manufacturing with extended product life cycles and traceability. The series includes multiple gain options to accommodate various current sensing requirements while maintaining consistent performance characteristics across the family.

Replacement Considerations

Standard commercial variants like the INA190A3IDDFR lack the enhanced product qualifications and extended temperature range. Substituting non-EP versions may compromise reliability in defense or aerospace applications due to differences in fabrication site controls and lifecycle management.

FAQ

How does the INA190A3NDDFREP achieve bidirectional current sensing?

It uses an external voltage applied to the REF pin to offset the output. Positive differential inputs result in an output greater than the reference voltage, while negative inputs result in an output lower than the reference voltage.

What is the benefit of the capacitively coupled input stage?

The capacitively coupled input blocks DC common-mode voltages from downstream circuits, resulting in very high common-mode rejection ratios and allowing the use of input filters without degrading measurement accuracy.