Texas Instruments INA310B4IDGKR

Overview

INA310B4IDGKR from Texas Instruments is a 200 V/V ultra-precise current sense amplifier with integrated open-drain comparator and 0.6 V internal reference, operating over −4 V to +110 V common-mode range and delivering 1.3 MHz bandwidth, 2.5 V/µs slew rate, and 140 dB min CMRR for high-speed overcurrent protection in 48 V BMS and DC/DC converters.

For engineers reviewing the INA310B4IDGKR datasheet, INA310B4IDGKR pinout, INA310B4IDGKR application, or INA310B4IDGKR equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal and comparator timing behavior, and real-world implementation context for high-voltage current monitoring systems.

Technical Context

The INA310B4IDGKR uses a zero-drift, precision topology enabling ±30 µV max offset voltage (RTI), ±0.5% max gain error, and ±1 µV/°C drift across −40°C to +125°C - all while maintaining flat 20 µA input bias current up to 110 V common-mode. Its multistage amplifier architecture sustains 900 kHz bandwidth at 200 V/V gain with 10 µs settling to 0.5%.

Its integrated comparator features 1 µs propagation delay, 8 mV hysteresis, latching mode controlled by RESET pin, and operates independently of supply voltage via open-drain CMPOUT capable of sinking up to 2.35 mA - supporting robust fault signaling in noisy 48 V power rails.

Key Specifications

Pinout & Package

INA310B4IDGKR is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm body size) with exposed pad for thermal enhancement and standard JEDEC MO-178AC footprint compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A4DR and MAX40088ASA+, the INA310B4IDGKR uniquely combines 110 V common-mode tolerance, integrated 0.6 V reference, and 900 kHz bandwidth at 200 V/V - making it the only option qualified for fault-critical 48 V BMS and macro-RRU deployments demanding single-chip precision and speed.

Availability

INA310B4IDGKR is available at Aetrix Electronics and suitable for 48 V battery management systems, 48 V DC/DC converters, and macro remote radio unit (RRU) designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial and telecom OEMs.

Supply support for INA310B4IDGKR 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 designed specifically for high-voltage, high-speed current sensing in next-generation 48 V power architectures - targeting BMS, server PSUs, and telecom infrastructure where accuracy, speed, and integration reduce system complexity.

FAQ

What is the maximum common-mode voltage the INA310B4IDGKR can withstand during normal operation?

The INA310B4IDGKR 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 on 48 V bus rails with headroom for transients. The device also survives −20 V to +120 V per absolute maximum ratings, but sustained operation above +110 V is not specified.

Does the INA310B4IDGKR require external components to set the comparator threshold?

Yes - the INA310B4IDGKR includes a 0.6 V internal reference, but the comparator threshold is set externally via a resistor divider from OUT to GND, feeding CMPIN. TI recommends keeping the total divider resistance ≤100 kΩ to minimize error from comparator input bias current (≤20 nA near 0.6 V), ensuring accurate trip-point alignment.

How does the RESET pin affect comparator behavior in the INA310B4IDGKR?

The RESET pin configures the comparator's functional mode: when pulled high (≥1.2 V), it enables latching mode - CMPOUT stays asserted after overcurrent detection until RESET is pulsed low. When grounded or left open (due to internal 2 MΩ pull-down), it operates in transparent mode - CMPOUT tracks CMPIN in real time. No external pull-up/down is needed for default transparent operation.

What is the typical propagation delay from overcurrent event to CMPOUT assertion in the INA310B4IDGKR?

The total propagation delay from VSENSE exceeding the programmed threshold to CMPOUT going low (open-drain active) is 1 µs under small-signal overdrive conditions (20 mV). This includes amplifier response, resistive divider settling, and comparator decision time - verified across −40°C to +125°C and critical for fast OCP in 48 V server PSUs.

Can the INA310B4IDGKR be used for low-side current sensing, and what layout considerations apply?

Yes - the INA310B4IDGKR supports both high-side and low-side configurations. For low-side use, connect IN+ to the load side and IN− to ground. Critical layout requirements include Kelvin connections to the shunt, separation of analog and power grounds, localized 0.1 µF ceramic bypass at VS, and routing CMPIN away from noisy switch nodes to preserve 8 mV hysteresis effectiveness.