Texas Instruments INA310A5IDGKR

Overview

INA310A5IDGKR 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 500 V/V fixed gain, ±20 µV max offset voltage, 0.15% max gain error, and 1.3 MHz bandwidth across –4 V to +110 V common-mode range - enabling fast overcurrent protection in DC/DC converters and battery management.

For engineers reviewing the INA310A5IDGKR datasheet, INA310A5IDGKR pinout, INA310A5IDGKR application, or INA310A5IDGKR equivalent, this page provides verified technical context, validated pin functions, confirmed application use cases in 48 V BMS and macro RRU, and two rigorously cross-checked alternative parts with documented functional differences.

Technical Context

The INA310A5IDGKR uses a zero-drift topology with precision resistor network to achieve ±20 µV offset and 0.15% gain error at 25°C, with drift limited to ±0.25 µV/°C and 10 ppm/°C over –40°C to +125°C. Its input stage operates independently of supply voltage, supporting –4 V to +110 V common-mode while powered from 2.7 V to 20 V.

It integrates a comparator with 0.6 V internal reference, 8 mV hysteresis, and 1 µs propagation delay. The RESET pin enables transparent or latched operation: grounded or floating for real-time response; pulled high for fault-hold behavior - critical for safety-critical overcurrent detection in 48 V server PSUs.

Key Specifications

Pinout & Package

INA310A5IDGKR is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm), optimized for high-density 48 V power stages with thermal resistance R_θJA = 172.2°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA310A5IDGKR, INA240A5IDR trades precision and integration for lower cost, while MAX40085AUT+T offers higher bandwidth but demands more external components - making INA310A5IDGKR optimal for space-constrained, safety-critical 48 V systems needing self-contained overcurrent response.

Availability

INA310A5IDGKR is available at Aetrix Electronics and suitable for 48 V DC/DC converters, 48 V battery management systems (BMS), and macro remote radio unit (RRU) applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA310A5IDGKR 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 power management ICs.

INA310A5IDGKR belongs to TI's ultra-precise current sense amplifier product line, engineered specifically for high-voltage, high-speed current monitoring in next-generation 48 V power architectures including datacenter PSUs and EV charging infrastructure.

FAQ

What is the maximum common-mode voltage supported by the INA310A5IDGKR?

The INA310A5IDGKR supports a continuous common-mode input range of –4 V to +110 V, with survival rating up to –20 V to +120 V. This allows direct connection to 48 V bus lines and compatibility with transient overvoltage conditions in industrial power systems - all while operating from a 2.7 V to 20 V supply independent of the common-mode level.

How does the RESET pin affect comparator behavior in the INA310A5IDGKR?

In the INA310A5IDGKR, the RESET pin controls comparator latching: when held high, the comparator output remains asserted after overcurrent detection until RESET is pulsed low; when grounded or left floating, the comparator operates transparently - asserting CMPOUT only while CMPIN exceeds the 0.6 V threshold. This dual-mode flexibility supports both fault-hold and real-time monitoring use cases.

Can the INA310A5IDGKR be used for low-side current sensing?

Yes, the INA310A5IDGKR supports both high-side and low-side configurations. For low-side sensing, connect IN+ to the load side of the shunt and IN– to ground. Its wide common-mode range (–4 V to +110 V) and rail-to-rail output swing ensure accurate measurement even when the shunt is placed between load and ground in 48 V systems.

What is the typical propagation delay from shunt overcurrent to CMPOUT assertion in the INA310A5IDGKR?

The INA310A5IDGKR achieves a total propagation delay of 1 µs from shunt voltage exceeding the programmed trip point to CMPOUT going high. This includes amplifier settling, external resistor-divider delay, and comparator response - verified under 20 mV overdrive at 25°C - making it suitable for fast overcurrent protection in 48 V server PSUs and telecom equipment.

Does the INA310A5IDGKR require external components for basic operation?

The INA310A5IDGKR requires only a supply bypass capacitor (≥1 µF ceramic) and an external pull-up resistor on CMPOUT (e.g., 5.1 kΩ to VS). For overcurrent detection, a two-resistor divider from OUT to CMPIN sets the trip threshold; TI recommends total divider resistance ≤100 kΩ to minimize comparator input bias current error. No external reference or latch circuitry is needed due to on-chip 0.6 V reference and RESET-controlled latching.