Texas Instruments INA310A2IDGKR

Overview

INA310A2IDGKR 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 50 V/V fixed gain, ±20 µV max offset voltage, 160 dB CMRR, and 1.3 MHz bandwidth - enabling fast overcurrent detection in DC/DC converters and battery management systems.

For engineers reviewing the INA310A2IDGKR datasheet, INA310A2IDGKR pinout, INA310A2IDGKR application, or INA310A2IDGKR equivalent, key selection criteria include its −4 V to +110 V common-mode range, latching comparator mode, 1 µs propagation delay, and VSSOP-8 package compatibility with space-constrained 48 V power rails.

Technical Context

The INA310A2IDGKR 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 operates independently of supply voltage (2.7 V–20 V), supporting both high-side sensing at bus voltages up to 110 V and low-side configurations with ground-referenced shunts.

The integrated comparator features 8 mV hysteresis, 0.6 V reference, and RESET-controlled latching mode - where grounding or floating RESET enables transparent operation, while pulling RESET high enables latch-and-hold fault signaling. Propagation delay remains ≤1 µs from sense voltage threshold crossing to CMPOUT assertion.

Key Specifications

Pinout & Package

The INA310A2IDGKR 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 48 V power modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A2IDR and MAX40056ATA+T, the INA310A2IDGKR uniquely combines ultra-low offset (±20 µV), highest CMRR (160 dB), and fastest comparator response (1 µs) in a single VSSOP-8 package - making it optimal for high-reliability 48 V overcurrent protection where accuracy, noise immunity, and speed are jointly critical.

Availability

INA310A2IDGKR is available at Aetrix Electronics and suitable for 48 V DC/DC converters, battery management systems, and macro remote radio units requiring stable component supply and long-term industrial lifecycle support.

Supply support for INA310A2IDGKR 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 architectures - targeting datacenter power, automotive electrification, and 5G infrastructure where speed, offset stability, and integration reduce system complexity.

FAQ

What is the maximum common-mode voltage the INA310A2IDGKR can withstand during normal operation?

The INA310A2IDGKR supports a continuous operational common-mode input range of −4 V to +110 V, independent of its 2.7 V–20 V supply voltage. This enables direct high-side sensing on 48 V bus rails with margin, and compatibility with negative-rail industrial actuators. Survival rating extends to −20 V to +120 V per absolute maximum ratings.

How does the RESET pin affect comparator behavior in the INA310A2IDGKR?

When the RESET pin of the INA310A2IDGKR is left open or tied to GND, the comparator operates in transparent mode - CMPOUT follows CMPIN in real time. When RESET is pulled high to VS, the comparator enters latching mode: CMPOUT stays high after first over-threshold event until RESET is actively pulled low or released. This behavior is confirmed in the functional description and pin table of the SBOSA86 datasheet.

What is the guaranteed maximum gain error for the INA310A2IDGKR across temperature?

The INA310A2IDGKR has a maximum gain error of ±0.15% at room temperature, with a worst-case drift of 10 ppm/°C over −40°C to +125°C. This means total gain error remains within ±0.25% across full temperature range - verified in Electrical Characteristics Table 6.5 and Figure 6-10 of the official datasheet.

Can the INA310A2IDGKR be used for low-side current sensing, and how are IN+ and IN− connected?

Yes, the INA310A2IDGKR supports low-side sensing: IN+ connects to the load side of the shunt resistor, and IN− connects to the system ground side. The device's rail-to-rail input stage and −4 V common-mode capability ensure accurate measurement even when shunt is placed between load and ground - confirmed in Pin Function Table 5-1 and Section 7.4.1 of the datasheet.

What is the minimum recommended pull-up resistance for the CMPOUT pin of the INA310A2IDGKR?

The datasheet specifies a 5.1 kΩ pull-up resistor from CMPOUT to VS in all test conditions, and recommends keeping total divider resistance below 100 kΩ for optimal comparator threshold accuracy. Lower values (e.g., 2.2 kΩ–10 kΩ) improve rise time and noise immunity, especially when interfacing with 3.3 V GPIOs - consistent with Figure 6-34 VOL vs I_SINK and Section 7.3.7.