INA181A4IDBVR

Overview

The INA181A4IDBVR is a bidirectional current-sense amplifier manufactured by Texas Instruments. It operates with a supply voltage range of 2.7 V to 5.5 V and supports common-mode voltages from -200 mV to 26 V. The device features a fixed gain of 200 V/V, a bandwidth of 105 kHz, and a typical CMRR of 100 dB. It draws 260 µA of supply current and has an input offset voltage of 100 µV. Packaged in a 6-pin SOT-23, it functions within a temperature range of -40°C to +125°C.

Feature Summary

• Supports bidirectional current sensing with output voltage proportional to differential input across the shunt resistor.
• Enables high-side or low-side measurement capabilities through wide common-mode voltage tolerance.
• Provides rail-to-rail analog voltage output for direct interfacing with microcontrollers or ADCs.

Applications

• Battery management systems requiring precise current monitoring
• Industrial process control loops with ground-referenced loads
• Overcurrent protection circuits in power distribution units

Procurement Notes

Verify the specific suffix IDBVR corresponds to the SOT-23-6 package and tape-and-reel shipping configuration. Confirm that the A4 grade meets the required gain accuracy specifications for the target application. Ensure compatibility with the system's operating temperature range and voltage levels before finalizing procurement orders.

Selection Notes

Select this component when a fixed gain of 200 V/V is required for small signal amplification. Consider the 105 kHz bandwidth limit for dynamic response requirements. Evaluate the 26 V common-mode range against the maximum bus voltage present in the circuit design to ensure safe operation margins.

Part Context

This part belongs to the INA181 family of precision current-sense amplifiers designed for cost-sensitive applications. It shares architectural similarities with other members like the INA180 but offers distinct gain and bandwidth characteristics. The series targets general-purpose sensing needs where moderate precision and low power consumption are prioritized over ultra-high speed performance.

Replacement Considerations

INA181A3IDBVR: Offers different gain settings within the same package. INA181A1IDCKR: SC-70-6 package alternative with similar electrical characteristics. Verify pinout compatibility and thermal performance when substituting.