Texas Instruments INA301A2IDGKR

Overview

INA301A2IDGKR from Texas Instruments is a 36-V common-mode, zero-drift current-shunt monitor IC with dual output (voltage amplifier + high-speed comparator), 50 V/V fixed gain, ±15 µV max offset voltage, 0.5 µV/°C max drift, and 1 µs total alert response time - used for precision overcurrent detection in high-side power rails of telecom equipment and battery management systems.

For engineers reviewing the INA301A2IDGKR datasheet, INA301A2IDGKR pinout, INA301A2IDGKR application, or INA301A2IDGKR equivalent, this page delivers verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options - all grounded in TI's SBOS713A production datasheet and official package documentation.

Technical Context

The INA301A2IDGKR integrates a precision zero-drift instrumentation amplifier and a dedicated high-speed comparator on a single die. Its amplifier uses auto-zeroing architecture to achieve ≤±15 µV offset and ≤0.5 µV/°C drift over –40°C to +125°C, enabling accurate measurement of sub-100 mV differential signals across 0–36 V common-mode range. The comparator features an internal 80 µA current source at LIMIT pin, programmable hysteresis (50 mV), and open-drain ALERT output with <1 µs propagation delay under 1 mV overdrive.

It operates from a single 2.7–5.5 V supply, draws ≤700 µA quiescent current, and supports two alert modes: transparent (RESET = low) and latched (RESET = high). Pin-level control of RESET and LIMIT enables flexible system-level fault handling without external logic - critical for server PSU protection and industrial motor drives requiring deterministic fault capture.

Key Specifications

Pinout & Package

VSSOP-8 package (DGK suffix), 3.00 mm × 3.00 mm body size, exposed thermal pad optional. Pin 1 marked via dot or bevel; pin numbering follows standard counter-clockwise top-view convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-shunt monitor applications.

Compared with INA301A2IDGKR, INA219BIDR trades analog output and sub-microsecond alert for integrated I²C telemetry, while MAX40056AUT+T offers higher bandwidth but removes latching and limits gain flexibility - making INA301A2IDGKR uniquely balanced for cost-sensitive, safety-critical analog+hardware-fault applications.

Availability

INA301A2IDGKR is available at Aetrix Electronics and suitable for telecom power supply protection, battery management systems, industrial motor drive protection, and server PSU overcurrent detection requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for INA301A2IDGKR 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 over 50 years of innovation in precision signal chain and power management solutions.

The INA301 product line delivers integrated current-sensing amplifiers with on-chip comparators for high-reliability overcurrent protection - designed specifically for telecom infrastructure, industrial automation, and energy storage systems demanding zero-drift accuracy and sub-microsecond fault response.

FAQ

What is the maximum common-mode voltage the INA301A2IDGKR can measure?

The INA301A2IDGKR supports a common-mode input voltage range of 0 V to 36 V - meaning it can accurately monitor current through a shunt resistor placed on power rails up to 36 V, regardless of its own 2.7–5.5 V supply voltage. This capability is explicitly specified in Section 6.5 of the SBOS713A datasheet and validated across –40°C to +125°C.

How do I configure the INA301A2IDGKR for latched alert mode?

To configure latched alert mode on the INA301A2IDGKR, hold the RESET pin at a logic-high voltage (≥1.4 V) - this forces the ALERT output to remain low after an overcurrent event until RESET is actively pulled low for ≥100 ns. This behavior is documented in Section 7.3.2.2 and Table 1 of the SBOS713A datasheet, and is electrically validated across temperature and supply variations.

What is the typical value of RLIMIT for a 10 A overcurrent threshold with a 5 mΩ shunt resistor?

For a 10 A trip current and 5 mΩ shunt, the differential input is 50 mV. With INA301A2IDGKR's 50 V/V gain, VOUT = 2.5 V at trip. Using the internal 80 µA LIMIT current source, RLIMIT = 2.5 V / 80 µA = 31.25 kΩ - a standard 31.6 kΩ (1%) resistor is recommended. This calculation follows Equation in Table 2 of SBOS713A Section 7.3.3.1.

Does the INA301A2IDGKR require external calibration for offset error?

No, the INA301A2IDGKR does not require external calibration - its zero-drift architecture guarantees ≤±15 µV max input offset voltage and ≤0.5 µV/°C max drift over –40°C to +125°C, as tested and guaranteed in production (Section 6.5 Electrical Characteristics). System-level offset trimming is unnecessary for most precision current-sensing applications.

Can the ALERT output of the INA301A2IDGKR be pulled up to 12 V?

No - the ALERT pin is open-drain but rated for absolute maximum voltage of 6 V (Section 6.1 Absolute Maximum Ratings). Pulling ALERT above 5.5 V violates the "(VS) + 0.3 V" limit and risks permanent damage. For interfacing with 12 V logic, use a level-shifting buffer or optocoupler; TI recommends ≤5.5 V pull-up per SBOS713A Section 7.3.1.