INA190A1QDDFRQ1

Overview

The INA190A1QDDFRQ1 is an automotive-grade, bidirectional current sense amplifier with a fixed gain of 25 V/V. 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 maximum offset voltage of ±15 µV and a minimum common-mode rejection ratio of 132 dB. It draws a typical quiescent current of 65 µA when enabled and reduces to 100 nA maximum in shutdown mode. The component is housed in an SOT-23-THIN-8 package and is qualified for operation between -40°C and +125°C.

Feature Summary

• Features an enable pin that allows the device to enter a low-power shutdown state with minimal supply current draw.
• Provides bidirectional current sensing capability by utilizing an external reference voltage at the REF pin.
• Utilizes a zero-drift architecture to maintain high accuracy across wide temperature ranges.
• Supports both high-side and low-side current monitoring configurations independent of the supply voltage.

Applications

• Body control module (BCM)
• Telematics control unit
• Emergency call (eCall) systems
• Battery management system (BMS)

Procurement Notes

Verify the specific A1 gain variant matches the design requirement of 25 V/V. Confirm the DDF package includes the ENABLE pin functionality if power management is required. Ensure the operating environment stays within the specified -40°C to +125°C range. Check that the common-mode voltage does not exceed the 40 V limit during transient events.

Selection Notes

Select this component for applications requiring precise measurement of microamp-level currents where low input bias current is critical. The fixed 25 V/V gain suits scenarios with small differential signals. Consider the SOT-23-THIN-8 package for space-constrained designs. Verify compatibility with the system's supply voltage range of 1.7 V to 5.5 V.

Part Context

This part belongs to the INA190-Q1 family of ultra-precise current sense amplifiers designed for automotive environments. It shares the core zero-drift technology and low bias current characteristics with other variants like the INA190A2QDDFRQ1, differing primarily in gain settings and package options. The series is engineered for direct connection to automotive battery rails.

Replacement Considerations

INA190A2QDDFRQ1 offers a different gain option (50 V/V) but maintains similar electrical characteristics and package type.

FAQ

How does the device achieve bidirectional sensing?

Bidirectional sensing is achieved by applying a reference voltage to the REF pin, which offsets the output voltage to allow detection of both positive and negative differential input voltages.

What is the function of the ENABLE pin?

The ENABLE pin controls the operational state of the device. Driving it to VS activates the amplifier, while driving it to GND disables the device, reducing supply current to less than 100 nA and placing the output in a high-impedance state.