Texas Instruments INA310A4IDGKR

Overview

INA310A4IDGKR from Texas Instruments is an ultra-precise current sense amplifier with integrated open-drain comparator and 0.6 V internal reference, designed for high-side or low-side shunt monitoring in 48 V systems. It delivers 200 V/V fixed gain, ±5 µV max offset voltage (25°C), 160 dB CMRR, and operates across –4 V to +110 V common-mode range with 1.3 MHz bandwidth - enabling fast overcurrent detection in DC/DC converters and battery management.

For engineers reviewing the INA310A4IDGKR datasheet, INA310A4IDGKR pinout, INA310A4IDGKR application, or INA310A4IDGKR equivalent, this page provides verified technical context, validated pin functions, confirmed accuracy specs under real operating conditions (–40°C to +125°C), and two rigorously cross-checked alternative parts for 48 V power rail monitoring with latched fault signaling.

Technical Context

The INA310A4IDGKR employs a zero-drift topology with precision resistor network to achieve 0.15% max gain error and ±0.25 µV/°C offset drift across –40°C to +125°C. Its input stage supports common-mode voltages independent of supply (2.7 V to 20 V), enabling direct connection to 48 V bus without level-shifting.

It integrates a comparator with 1 µs propagation delay, 8 mV hysteresis, and latching mode controlled by the RESET pin - allowing persistent fault flagging until manual reset. The open-drain CMPOUT supports pull-up to up to 20 V, decoupling logic-level signaling from the sensing domain.

Key Specifications

Pinout & Package

VSSOP-8 package (3.00 mm × 3.00 mm), thermally enhanced for high-density 48 V power modules; 0.65 mm pitch, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA310B4IDGKR, the INA310A4IDGKR provides 10× lower offset drift and tighter gain error for mission-critical protection; versus INA240A4DR, it trades external component count for fixed gain and embedded fault latching - optimizing for minimal footprint in space-constrained 48 V power modules.

Availability

INA310A4IDGKR is available at Aetrix Electronics and suitable for 48 V DC/DC converter protection, 48 V battery management systems, and macro remote radio unit (RRU) current monitoring requiring stable component supply and guaranteed long-term manufacturability.

Supply support for INA310A4IDGKR 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 INA310x product line was engineered specifically for high-voltage, high-speed current sensing in next-generation 48 V architectures - delivering integrated protection, wide common-mode tolerance, and automotive-grade reliability in compact VSSOP packaging.

FAQ

What is the maximum common-mode voltage the INA310A4IDGKR can handle?

The INA310A4IDGKR supports a continuous operational common-mode input range of –4 V to +110 V, with survival rating up to –20 V to +120 V. This allows direct high-side sensing on 48 V and 60 V bus systems without external level-shifting circuitry, and remains functional during load-dump transients in automotive-derived 48 V architectures.

Does the INA310A4IDGKR require external components to set the overcurrent threshold?

Yes - the INA310A4IDGKR uses an external resistor divider from OUT to GND to scale its 200 V/V output down to the 0.6 V comparator threshold at CMPIN. TI recommends total divider resistance ≤100 kΩ to minimize error from comparator input bias current; no additional reference or comparator IC is needed due to the integrated 0.6 V reference and open-drain output.

How does the RESET pin affect comparator behavior in the INA310A4IDGKR?

When RESET is grounded or left floating, the INA310A4IDGKR comparator operates in transparent mode - CMPOUT follows CMPIN in real time. When RESET is pulled high to VS, it enters latching mode: CMPOUT stays high after first overcurrent event until RESET is actively pulled low or released. This enables reliable fault capture in systems with intermittent interrupts or slow host polling.

Can the INA310A4IDGKR be used for low-side current sensing?

Yes - the INA310A4IDGKR supports both high-side and low-side configurations. For low-side sensing, connect IN+ to the load side of the shunt and IN– to system ground. Its –4 V minimum common-mode rating accommodates ground-referenced measurements while maintaining full 160 dB CMRR and 200 V/V gain accuracy, unlike many competitors that degrade performance near GND.

What is the typical propagation delay from shunt overcurrent to CMPOUT assertion in the INA310A4IDGKR?

The total propagation delay from VSENSE exceeding the trip threshold to CMPOUT going low (in open-drain active state) is 1 µs under small-signal overdrive conditions. This includes amplifier group delay, output settling, resistor-divider response, and comparator decision time - verified across –40°C to +125°C and independent of supply voltage, making it suitable for sub-microsecond protection in GaN-based 48 V PSUs.