Texas Instruments INA301A3IDGKR

Overview

INA301A3IDGKR from Texas Instruments is a 36-V, high-speed, zero-drift current-shunt monitor IC with integrated voltage-output amplifier (gain = 100 V/V) and high-speed overcurrent comparator. It operates from 2.7 V to 5.5 V supply, supports 0 V to 36 V common-mode input, delivers ≤35 µV max offset, and achieves 1 µs total alert response time - enabling precise, fast overcurrent detection in high-side power rails of telecom power supplies and battery protection circuits.

For engineers reviewing the INA301A3IDGKR datasheet, INA301A3IDGKR pinout, INA301A3IDGKR application, or INA301A3IDGKR equivalent, this page provides verified functional context, validated pin roles, confirmed thermal and electrical specs per TI SBOS713A, and real-world implementation guidance for high-accuracy current monitoring with latched/transparent alert modes.

Technical Context

The INA301A3IDGKR integrates a precision zero-drift instrumentation amplifier and a dedicated high-speed comparator on a single die. Its amplifier uses auto-zeroing architecture to maintain ≤35 µV max offset and ≤0.5 µV/°C drift across –40°C to +125°C, while the comparator features an internal 80 µA current source at the LIMIT pin for resistor-programmable threshold setting and 1 µs propagation delay under 1 mV overdrive.

It supports dual operating modes via the RESET pin: transparent mode (RESET = low) for real-time interrupt-driven response, and latch mode (RESET = high) for polled-system reliability - both using the open-drain ALERT output with configurable pull-up. The device withstands full 36 V common-mode voltage at IN+/IN– even with VS removed, ensuring robustness in high-voltage industrial power paths.

Key Specifications

Pinout & Package

VSSOP-8 package (3.00 mm × 3.00 mm body), thermally enhanced for industrial ambient operation up to +125°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3DGNR and MAX40056ATA+T, the INA301A3IDGKR uniquely combines 100 V/V gain, integrated comparator with latch/transparent mode, and 36 V common-mode tolerance in a single VSSOP-8 package - making it optimal for cost-sensitive, space-constrained overcurrent protection where analog output and digital alert are both required.

Availability

INA301A3IDGKR is available at Aetrix Electronics and suitable for telecom power supplies, battery management systems, industrial motor drives, and server PSU redundancy control requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for INA301A3IDGKR 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 INA301 product line was designed specifically for high-accuracy, high-speed current monitoring in harsh industrial and telecom environments - integrating amplifier, comparator, and mode control into one compact solution to simplify overcurrent protection design.

FAQ

What is the maximum common-mode voltage the INA301A3IDGKR can handle?

The INA301A3IDGKR supports a common-mode input voltage range of 0 V to 36 V - meaning it can accurately measure shunt voltage on high-side rails up to 36 V, independent of its 2.7 V–5.5 V supply voltage. This rating holds across the full –40°C to +125°C operating temperature range and remains valid even if VS is unpowered, ensuring robustness during hot-swap or brownout events. The INA301A3IDGKR datasheet (SBOS713A, Section 6.1) confirms no damage occurs at 36 V common-mode stress.

How does the RESET pin configure alert behavior in the INA301A3IDGKR?

The RESET pin on the INA301A3IDGKR selects between two distinct alert modes: when pulled low, it enables transparent mode - the ALERT output follows the input state in real time; when pulled high, it activates latch mode - the ALERT output stays asserted until RESET is pulsed low for ≥100 ns. This dual-mode capability makes the INA301A3IDGKR adaptable to both interrupt-driven (MCU-based) and polled (resource-constrained) firmware architectures without external logic. The behavior is fully documented in TI SBOS713A Section 7.3.2.

What is the purpose of the LIMIT pin on the INA301A3IDGKR?

The LIMIT pin on the INA301A3IDGKR serves as the comparator's reference input, where an external resistor (RLIMIT) sets the overcurrent trip threshold via an internal 80 µA current source. The resulting voltage (VLIMIT = 80 µA × RLIMIT) is compared against the amplified shunt voltage at the OUT pin. When OUT exceeds VLIMIT, the ALERT pin asserts. This resistor-programmable method eliminates need for external DACs or precision references - a key differentiator of the INA301A3IDGKR versus discrete comparator solutions.

Can the INA301A3IDGKR operate with a 3.3 V supply?

Yes, the INA301A3IDGKR operates fully across 2.7 V to 5.5 V supply range, including standard 3.3 V logic rails. At 3.3 V, it maintains all specified performance: 100 V/V gain, ≤35 µV offset, 1 µs alert response, and 0 V–36 V common-mode tolerance. The OUT pin swings within 20 mV of GND and within 100 mV of VS, enabling direct interface with 3.3 V SAR ADCs or comparators. Quiescent current remains ≤700 µA, supporting low-power always-on monitoring - confirmed in SBOS713A Section 6.5 Electrical Characteristics.

What package type is used for the INA301A3IDGKR?

INA301A3IDGKR uses the DGK package: an 8-pin VSSOP (Very Small Outline Package) with 3.00 mm × 3.00 mm body size and 0.65 mm lead pitch. This thermally enhanced surface-mount package supports junction temperatures up to +150°C and is optimized for automated assembly in high-density PCB layouts. Pin configuration matches TI's standardized VSSOP-8 footprint, enabling drop-in compatibility with other TI current-sense monitors in the same package family.