Texas Instruments INA205AID

Overview

INA205AID from Texas Instruments is a unidirectional current-shunt monitor IC with 100 V/V gain, dual open-drain comparators (CMP1 latched, CMP2 programmable delay), and integrated 1.2-V reference output. It operates from 2.7 V to 18 V, supports –16 V to 80 V common-mode input range, and delivers 200 kHz bandwidth for precision shunt-based current sensing in high-side power rail monitoring.

For engineers reviewing the INA205AID datasheet, INA205AID pinout, INA205AID application, or INA205AID equivalent, this device is selected for high-accuracy, high-common-mode current measurement in battery protection, telecom power supplies, and industrial DC power systems where comparator-triggered fault response and stable internal references are required.

Technical Context

The INA205AID implements a precision current-sense amplifier stage followed by two independent comparators: CMP1 features latch-and-reset functionality via dedicated active-low CMP1 RESET pin, while CMP2 integrates a user-programmable RC delay circuit using the CMP2 DELAY pin and external capacitor. Its 100 V/V gain enables accurate detection of low shunt voltage drops (e.g., 20–100 mV) at high common-mode voltages up to 80 V.

Internal 0.6-V comparator references are accessible on pins 3 and 6 in 14-pin packages (SOIC/TSSOP), allowing override with external thresholds; the 1.2-V REF OUT pin provides a buffered, low-drift reference for system-level analog functions. All comparators feature open-drain outputs compatible with 5.1-kΩ pull-up to VS.

Key Specifications

Pinout & Package

INA205AID is packaged in SOIC-14 (8.65 mm × 3.91 mm) with exposed pad thermal performance optimized for industrial ambient conditions. Pin functions are validated per TI SBOS393E Rev E.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-sense monitor with dual-comparator applications.

Compared with INA204AID and INA206AID, the INA205AID uniquely combines maximum gain (100 V/V), dual independent comparators with distinct timing behaviors (latch vs. delay), and a buffered 1.2-V reference-making it optimal for complex, multi-level protection schemes requiring both immediate and time-gated responses.

Availability

INA205AID is available at Aetrix Electronics and suitable for battery management systems, telecom power supplies, industrial motor drives, and server power unit designs requiring stable component supply, extended temperature operation, and integrated fault signaling.

Supply support for INA205AID 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 signal conditioning and power management ICs.

The INA20x family-including INA205AID-is designed for high-accuracy, high-common-mode current sensing in power-constrained industrial, telecom, and automotive subsystems where integrated comparators and references reduce system component count.

FAQ

What is the maximum common-mode voltage supported by the INA205AID?

The INA205AID supports a common-mode input voltage range of –16 V to 80 V. This allows direct high-side current sensing in 48 V and 60 V systems, negative-rail battery configurations, and industrial DC buses without external level-shifting circuitry. The specification is guaranteed across the full operating temperature range of –40°C to 125°C.

How does the CMP2 DELAY pin function in the INA205AID?

The CMP2 DELAY pin on the INA205AID accepts an external capacitor to set the response delay of Comparator 2. Using the formula CDELAY (μF) = tD / 5, a 0.1 μF capacitor yields a nominal 0.5 s delay. This delay applies to both rising and falling edges of the comparator output and prevents false triggering during short-duration transients like inrush currents.

Can the internal 0.6-V reference be overridden on the INA205AID?

Yes-the INA205AID provides internal 0.6-V references on pins 3 (CMP1 IN−/0.6V REF) and 6 (CMP2 IN−/0.6V REF) in its SOIC-14 package. These can be overridden by applying external voltages within the specified input range (0 V to VS – 1.5 V), enabling custom comparator thresholds independent of the internal reference.

What is the purpose of the 1.2-V REF OUT pin on the INA205AID?

The 1.2-V REF OUT pin delivers a buffered, low-drift (40–100 ppm/°C) reference voltage capable of sourcing up to 1 mA. It is used to bias external circuitry-such as ADC references, op-amp levels, or secondary comparator inputs-eliminating the need for discrete reference ICs and improving system accuracy and stability.

Does the INA205AID require external pull-up resistors on its comparator outputs?

Yes-both CMP1 OUT and CMP2 OUT are open-drain outputs and require external pull-up resistors to VS (typically 4.7 kΩ or 5.1 kΩ). This configuration enables wired-OR logic, voltage-level translation, and compatibility with microcontroller GPIOs configured as interrupt inputs with internal or external pull-ups.