Texas Instruments INA225AIDGKT

Overview

INA225AIDGKT from Texas Instruments is a 36-V, bidirectional, zero-drift current-shunt monitor IC with programmable voltage-output gain (25/50/100/200 V/V), ±150 μV max offset voltage, and 250-kHz bandwidth at G=25. It measures shunt voltage drops across resistors in power supplies, motor drives, and telecom equipment while operating from 2.7 V to 36 V supply.

For engineers reviewing the INA225AIDGKT datasheet, INA225AIDGKT pinout, INA225AIDGKT application, or INA225AIDGKT equivalent, this page delivers verified functional role, gain-select logic mapping, thermal performance (θJA = 163.6°C/W), output swing limits (VS – 0.2 V min), and real-world accuracy trade-offs between shunt resistor selection and offset-induced error.

Technical Context

The INA225AIDGKT implements a zero-drift chopper-stabilized architecture to maintain ±150 μV max input offset and 0.5 μV/°C max drift over –40°C to +125°C. Its four discrete gain states are set by static digital inputs GS0/GS1 referenced to VS or GND - no internal logic or clock required.

It supports bidirectional sensing via external REF pin biasing (0 V to VS), enabling current direction detection in H-bridge motor control or battery charge/discharge monitoring. Common-mode rejection exceeds 95 dB across 0–36 V, and PSRR remains >100 dB up to 100 kHz.

Key Specifications

Pinout & Package

INA225AIDGKT is housed in an MSOP-8 package (3.0 mm × 3.0 mm, 0.65 mm pitch) with exposed thermal pad for enhanced heat dissipation in high-current sensing layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-sense amplifier applications.

Compared with INA225AIDGKT, INA240A1IDR offers superior offset performance but lacks gain configurability and bidirectional capability, while MAX40056ASA+T extends voltage range at the cost of power efficiency and sensing flexibility - making INA225AIDGKT optimal for mid-voltage, multi-gain, bidirectional applications.

Availability

INA225AIDGKT is available at Aetrix Electronics and suitable for power supply monitoring, motor control feedback, and computer power management requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and automotive programs.

Supply support for INA225AIDGKT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and current-sensing solutions.

The INA225AIDGKT belongs to TI's high-accuracy current-shunt monitor product line, designed specifically for bidirectional, wide common-mode, and programmable-gain applications in power conversion, motor control, and energy measurement systems.

FAQ

What is the maximum common-mode voltage supported by the INA225AIDGKT?

The INA225AIDGKT supports a common-mode input voltage range of 0 V to +36 V, independent of its supply voltage. This allows high-side current sensing on 24-V or 36-V bus lines without level-shifting circuitry. The specification is guaranteed over the full operating temperature range (–40°C to +125°C), and absolute maximum rating extends to +40 V for transient tolerance.

How do I configure the gain of the INA225AIDGKT?

The INA225AIDGKT gain is configured using two digital inputs: GS0 and GS1. Tie each pin to either VS (logic high) or GND (logic low) to select 25 V/V, 50 V/V, 100 V/V, or 200 V/V per the truth table in the datasheet. No pull-up/down resistors are needed - direct connection ensures reliable state setting. Floating pins are undefined and must be avoided.

Can the INA225AIDGKT measure bidirectional current flow?

Yes, the INA225AIDGKT supports bidirectional current sensing via its REF pin. When REF is biased to a voltage between GND and VS (e.g., VS/2), the OUT pin outputs a voltage centered at that reference - positive for current in one direction, negative deviation for the opposite. This enables true bidirectional monitoring in H-bridge drivers and battery charge/discharge systems.

What is the output voltage swing limitation of the INA225AIDGKT?

The INA225AIDGKT output swings from GND + 7 mV (min, at G=25, RL = 10 kΩ) up to VS – 0.2 V (min, same conditions). At higher gains or heavier loads, swing degrades further - e.g., at G=200, minimum high-side swing is VS – 0.6 V. These limits define usable shunt voltage range and must be accounted for in full-scale design.

Does the INA225AIDGKT require external filtering for EMI immunity?

While not mandatory, external RC filtering at the IN+/IN− inputs is recommended for noisy environments. Use series resistors ≤10 Ω and capacitors sized per cutoff frequency requirements (e.g., 10 Ω + 10 nF → 1.6 MHz). Avoid larger resistors - they introduce gain error due to input bias current mismatch. The INA225AIDGKT's 95+ dB CMRR provides inherent noise rejection, but board-level filtering improves robustness in switch-mode power systems.