INA2181A3IDGST

Overview

The INA2181A3IDGST is a dual-channel, bi-directional 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 up to 12 V. The device features a fixed gain of 200 V/V and a bandwidth product of 105 kHz. Key electrical specifications include a maximum input offset voltage of 100 µV, a typical CMRR of 100 dB, and a quiescent current of 500 µA per channel. It functions within an operating temperature range of -40 °C to +125 °C and is housed in a 10-pin VSSOP package.

Feature Summary

• Dual-channel architecture providing independent current sensing for two separate circuits within a single compact package.
• Bi-directional signal processing capability allowing accurate measurement of current flow in both directions across the shunt resistor.
• High common-mode voltage tolerance enabling direct connection to high-side buses without requiring level shifting.

Applications

• Multi-rail power distribution monitoring in industrial equipment
• Battery management systems requiring bidirectional charge/discharge tracking
• Hot-swap controller interfaces for peripheral protection

Procurement Notes

Verify the specific suffix IDGST corresponds to the TSSOP/VSSOP-10 package variant when sourcing. Confirm that the A-grade accuracy meets system requirements, as other grades may offer different offset characteristics. Ensure the component is sourced from authorized distributors to guarantee authenticity and traceability, particularly given the availability of obsolete or end-of-life notices for similar series members.

Selection Notes

Select this component when dual-channel isolation is required within a limited board area. The 200 V/V gain suits applications with moderate shunt resistances where higher gain would saturate the output. Consider the 500 µA quiescent current against low-power constraints, as it is higher than some single-channel alternatives. Verify that the 12 V common-mode limit aligns with the bus voltage levels in the target design.

Part Context

This part belongs to the INA2181 family of current sense amplifiers, designed for precision monitoring in space-constrained environments. It complements single-channel variants like the INA2180 by offering dual functionality. The device integrates internal gain setting resistors, eliminating external components typically needed for discrete amplifier configurations. It serves as a bridge between analog current signals and digital ADC inputs in mixed-signal systems.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official Texas Instruments resources for cross-reference data before replacing this component.