Texas Instruments INA310A1IDGKR

Overview

INA310A1IDGKR from Texas Instruments is an ultra-precise, high-speed 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 20 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 systems.

For engineers reviewing the INA310A1IDGKR datasheet, INA310A1IDGKR pinout, INA310A1IDGKR application, or INA310A1IDGKR equivalent, this device supports precision current measurement at low VSENSE levels, latching comparator operation via RESET control, and stable performance from –40°C to +125°C in space-constrained 8-pin VSSOP packaging.

Technical Context

The INA310A1IDGKR employs a zero-drift topology with 160 dB CMRR and 2.5 V/µs slew rate to maintain accuracy under high common-mode transients and wide supply variation (2.7 V to 20 V). Its input bias current remains flat at 20 µA across the full –20 V to +120 V survival range, decoupling sensing fidelity from bus voltage fluctuations.

Integrated comparator features 1 µs propagation delay, 8 mV hysteresis, and configurable latching mode via RESET pin - allowing transparent response when grounded/open or persistent fault flagging when pulled high. The 0.6 V reference enables precise trip-point setting using external resistor dividers with ≤100 kΩ total resistance for minimal threshold error.

Key Specifications

Pinout & Package

INA310A1IDGKR is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm), optimized for thermal performance and PCB area efficiency in high-density power modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR and INA301A1IDCKR, the INA310A1IDGKR uniquely combines ultra-low offset, high bandwidth, and integrated latching comparator - making it optimal for autonomous, high-reliability overcurrent protection in 48 V infrastructure without MCU intervention.

Availability

INA310A1IDGKR is available at Aetrix Electronics and suitable for 48 V DC/DC converter monitoring, 48 V battery management systems (BMS), and macro remote radio unit (RRU) power supervision requiring stable component supply and long-term production continuity.

Supply support for INA310A1IDGKR 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.

The INA310x product line was engineered specifically for high-voltage, high-accuracy current sensing in next-generation 48 V power architectures - emphasizing speed, stability, and integration to reduce system-level protection latency.

FAQ

What is the maximum common-mode voltage the INA310A1IDGKR can withstand during normal operation?

The INA310A1IDGKR operates reliably across a common-mode input range of –4 V to +110 V per the datasheet's Recommended Operating Conditions. This allows direct high-side sensing on 48 V buses with significant transient headroom, and supports negative rail detection in bidirectional motor control. Survival rating extends to –20 V to +120 V, but sustained operation outside the –4 V to +110 V range may impact accuracy or longevity. The INA310A1IDGKR achieves this independently of its 2.7 V–20 V supply voltage.

How does the RESET pin affect comparator behavior in the INA310A1IDGKR?

The RESET pin on the INA310A1IDGKR configures comparator operation between two modes: when grounded or left floating, the comparator runs in transparent mode - CMPOUT follows CMPIN in real time. When pulled high to VS, it enters latching mode - CMPOUT stays asserted after first over-threshold event until RESET is actively pulled low or released. This enables hardware-level fault persistence without MCU polling. The INA310A1IDGKR's internal 2 MΩ pull-down ensures safe default transparent behavior if RESET is unconnected.

Can the INA310A1IDGKR be used for low-side current sensing, and what layout considerations apply?

Yes, the INA310A1IDGKR supports both high-side and low-side configurations. For low-side use, connect IN+ to the load side of the shunt and IN– to system ground. Critical layout requirements include Kelvin connections to the shunt terminals to avoid trace resistance errors, placement of 0.1 µF ceramic bypass capacitor close to VS and GND pins, and separation of analog ground (GND pin) from noisy power ground. The INA310A1IDGKR's 160 dB CMRR helps reject ground bounce, but proper routing remains essential for ±20 µV offset accuracy.

What is the minimum detectable current using the INA310A1IDGKR with a 1 mΩ shunt resistor?

With a 1 mΩ shunt and 20 V/V gain, the INA310A1IDGKR produces 20 mV output per 1 A sensed. Given its ±20 µV maximum offset, the minimum resolvable differential voltage is ~40 µV (2× offset), corresponding to ~2 mA current (40 µV ÷ 20 V/V ÷ 0.001 Ω). At room temperature, typical offset is <±10 µV, enabling reliable detection below 1 mA. The INA310A1IDGKR's 0.25 µV/°C drift ensures this resolution holds across –40°C to +125°C with minimal calibration drift.

Does the INA310A1IDGKR require external components to set the overcurrent threshold, and how is accuracy affected?

Yes - the overcurrent threshold is set by an external resistor divider from OUT to GND, feeding CMPIN. Accuracy depends on divider resistor tolerance and matching; TI recommends total resistance ≤100 kΩ to limit comparator input bias current error (<20 nA near 0.6 V), which otherwise introduces trip-point error. The INA310A1IDGKR's internal 0.6 V reference has ±20 mV tolerance over temperature, so final threshold uncertainty is dominated by resistor ratio error and reference drift - not amplifier gain error. No external reference or comparator IC is needed.