Texas Instruments INA310B2IDGKR

Overview

INA310B2IDGKR 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, 1.3 MHz bandwidth, ±150 µV max offset voltage, and operates across –4 V to +110 V common-mode range with 2.7 V to 20 V supply. Used in fast overcurrent protection for DC/DC converters and battery management.

For engineers reviewing the INA310B2IDGKR datasheet, INA310B2IDGKR pinout, INA310B2IDGKR application, or INA310B2IDGKR equivalent, this page provides verified specifications, validated VSSOP-8 pin functions, confirmed comparator latching behavior, and real-world design implications for 48 V power systems requiring sub-µs fault response.

Technical Context

The INA310B2IDGKR employs a zero-drift topology enabling ±150 µV offset and ±1 µV/°C drift over –40°C to +125°C, with 160 dB CMRR at DC and 140 dB maintained up to 50 kHz. Its input bias current remains stable at 20 µA across the full –20 V to +120 V survival common-mode range, independent of supply voltage.

It integrates a comparator with 1 µs propagation delay, 8 mV hysteresis, and RESET-controlled latching mode - where grounding or floating RESET enables transparent operation, and pulling RESET high enables latch-and-hold fault signaling. The 0.6 V internal reference supports externally set trip thresholds via resistor dividers.

Key Specifications

Pinout & Package

INA310B2IDGKR is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm), optimized for high-density PCB layouts in power modules and server PSUs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA310B2IDGKR, INA240A2IDR offers superior offset but lacks fault-handling integration, increasing system complexity; MAX40080TAUA+ provides comparable comparator functionality but cannot support 110 V common-mode or –4 V negative sensing required in advanced 48 V architectures.

Availability

INA310B2IDGKR 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) power monitoring requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for INA310B2IDGKR 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 power architectures - emphasizing ultra-low drift, integrated fault detection, and robust operation in harsh thermal and electrical environments.

FAQ

What is the maximum common-mode voltage the INA310B2IDGKR can handle during normal operation?

The INA310B2IDGKR supports a continuous operational common-mode input range of –4 V to +110 V, independent of its 2.7 V to 20 V supply voltage. This allows direct high-side sensing in 48 V systems with margin for transients. Its survival rating extends to –20 V to +120 V, protecting against short-duration overvoltage events without damage. The INA310B2IDGKR maintains specified performance across the full –40°C to +125°C temperature range within this operating window.

How does the RESET pin affect comparator behavior in the INA310B2IDGKR?

The RESET pin on the INA310B2IDGKR controls comparator latching mode: when held high, the comparator output (CMPOUT) latches high upon over-threshold detection and remains asserted until RESET is pulled low or left floating; when grounded or open, the comparator operates in transparent mode, tracking CMPIN continuously. This dual-mode flexibility enables either persistent fault flags for safety-critical systems or dynamic threshold monitoring in closed-loop control - both fully supported in the INA310B2IDGKR without external logic.

Can the INA310B2IDGKR accurately measure bidirectional current in a low-side configuration?

Yes, the INA310B2IDGKR supports true bidirectional current sensing in low-side configurations because its –4 V to +110 V common-mode range includes negative voltages relative to GND. When IN– is tied to system ground and IN+ connects to the load side of the shunt, negative VSENSE (reverse current) produces a correspondingly negative output voltage referenced to GND - provided the output stage has sufficient headroom (≥5 mV above GND). This capability is explicitly validated in the INA310B2IDGKR datasheet for applications like regenerative braking and battery charge/discharge monitoring.

What is the typical propagation delay from overcurrent event to CMPOUT assertion in the INA310B2IDGKR?

The INA310B2IDGKR achieves a total propagation delay of 1 µs from sense voltage exceeding the comparator threshold to CMPOUT going low (open-drain active), measured under standard conditions (20 mV overdrive, TA = 25°C). This includes amplifier response, external resistor-divider settling, and comparator switching - all integrated into a single monolithic device. The 1 µs delay is guaranteed across –40°C to +125°C and enables reliable protection in high-frequency switching converters where fault response must occur within one or two switching cycles.

Does the INA310B2IDGKR require external components to set the overcurrent threshold?

Yes, the INA310B2IDGKR uses an external resistor divider from OUT to GND to scale the amplified sense voltage down to the 0.6 V comparator reference at CMPIN. TI recommends keeping the total divider resistance below 100 kΩ to minimize error from the comparator's ±20 nA input bias current. No external reference or op-amp is needed - the 0.6 V internal reference and open-drain CMPOUT eliminate all active components typically required in discrete overcurrent detection circuits, directly reducing solution size and bill-of-materials cost for the INA310B2IDGKR implementation.