Texas Instruments INA310B1IDGKR

Overview

INA310B1IDGKR 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 20 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.

For engineers reviewing the INA310B1IDGKR datasheet, INA310B1IDGKR pinout, INA310B1IDGKR application, or INA310B1IDGKR equivalent, this device supports fast overcurrent protection in DC/DC converters, battery management, and server power supplies where precision, speed, and wide common-mode tolerance are critical.

Technical Context

The INA310B1IDGKR uses a zero-drift topology enabling ±150 µV max input offset and ±1 µV/°C drift over –40°C to +125°C, while maintaining 140–160 dB CMRR across its full –4 V to +110 V common-mode range - independent of supply voltage. Its 2.5 V/µs slew rate and 1 µs comparator propagation delay support real-time fault detection in high-voltage power stages.

It integrates a latching open-drain comparator with 0.6 V internal reference and programmable trip point via external resistor divider; RESET pin configures transparent (low or floating) or latched (high) operation. Input bias current remains stable at ~20 µA across full common-mode range, minimizing measurement error in high-impedance sensing paths.

Key Specifications

Pinout & Package

INA310B1IDGKR is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm), optimized for high-density PCB layouts in power-constrained applications such as 48 V server PSUs and macro RRUs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR and MAX40056ATA+T, the INA310B1IDGKR uniquely combines –4 V to +110 V common-mode tolerance, integrated latching comparator, and 1 µs fault response - making it optimal for high-reliability 48 V BMS and telecom power where voltage transients and autonomous protection are mandatory.

Availability

INA310B1IDGKR is available at Aetrix Electronics and suitable for 48 V battery management systems, rack server power supplies, and macro remote radio units requiring stable component supply and guaranteed long-term manufacturability.

Supply support for INA310B1IDGKR 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 accuracy, integration, and robustness in automotive, telecom, and datacenter applications.

FAQ

What is the maximum common-mode voltage the INA310B1IDGKR can withstand during normal operation?

The INA310B1IDGKR supports a continuous operational common-mode input range of –4 V to +110 V, independent of supply voltage. This allows direct high-side sensing on 48 V buses with margin for transients. Its survival rating extends to –20 V to +120 V, ensuring robustness against short-duration overvoltage events without damage.

Does the INA310B1IDGKR require external components to configure the overcurrent threshold?

Yes - the INA310B1IDGKR uses an external resistor divider from OUT to GND to scale the amplified sense voltage down to the 0.6 V comparator threshold at CMPIN. TI recommends total divider resistance ≤100 kΩ to minimize error from comparator input bias current; no external reference or op-amp is needed due to the integrated 0.6 V reference.

How does the RESET pin affect comparator behavior in the INA310B1IDGKR?

In the INA310B1IDGKR, the RESET pin controls latching mode: when held high, the comparator output (CMPOUT) latches high upon overcurrent detection and stays asserted until RESET is pulled low or left floating. When RESET is low or open, the comparator operates transparently - CMPOUT follows CMPIN in real time. This dual-mode flexibility supports both self-clearing and persistent fault signaling.

Can the INA310B1IDGKR be used for low-side current sensing, and what are the layout considerations?

Yes - the INA310B1IDGKR supports low-side sensing by connecting IN+ to the load side and IN– to system ground. For best accuracy, use Kelvin connections to the shunt resistor and place the device close to the shunt with separate analog and power ground traces. Avoid routing noisy digital signals near IN+ or IN– to preserve 140–160 dB CMRR performance.

What is the typical propagation delay from overcurrent event to CMPOUT assertion in the INA310B1IDGKR?

The INA310B1IDGKR achieves a total propagation delay of 1 µs from sense voltage exceeding the programmed trip point to CMPOUT going high. This includes amplifier settling, resistive divider delay, and comparator response - verified under small-signal overdrive conditions. The value holds across –40°C to +125°C and supports hardware-fast OCP in safety-critical 48 V systems.