Texas Instruments INA310A2QDGKRQ1

Overview

INA310A2QDGKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (−40°C to +125°C) 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 automotive power systems. It delivers 50 V/V fixed gain, 1.3 MHz bandwidth, ±15 µV max offset voltage, and operates across −4 V to +110 V common-mode range on a 2.7 V to 20 V supply - enabling fast overcurrent protection in eTurbo and EPS systems.

For engineers reviewing the INA310A2QDGKRQ1 datasheet, INA310A2QDGKRQ1 pinout, INA310A2QDGKRQ1 application, or INA310A2QDGKRQ1 equivalent, key selection criteria include its guaranteed 0.15% max gain error, 160 dB CMRR, latching comparator mode, reset-controlled transparency, and VSSOP-8 package compatibility with space-constrained automotive PCB layouts.

Technical Context

The INA310A2QDGKRQ1 employs a zero-drift, precision topology that maintains ±15 µV offset and 10 ppm/°C drift across −40°C to +125°C while rejecting common-mode transients up to 120 V survival rating. Its input bias current remains flat at 20 µA across the full −4 V to +110 V common-mode range - independent of supply voltage - enabling accurate low-VSENSE sensing with minimal shunt power loss.

Integrated comparator features 0.6 V internal reference, 8 mV hysteresis, 1 µs propagation delay, and RESET-pin-controlled latching mode. The comparator input (CMPIN) accepts 0–5.5 V signals, and CMPOUT is open-drain, supporting pull-up to up to 20 V independent of VS - allowing direct interface with 3.3 V, 5 V, or 12 V controller GPIOs without level-shifting.

Key Specifications

Pinout & Package

VSSOP-8 package (3.00 mm × 4.90 mm), thermally enhanced for automotive under-hood operation; pin pitch 0.65 mm, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A2QDRQ1 and MAX40056ATA+T, the INA310A2QDGKRQ1 uniquely combines AEC-Q100 Grade 1 qualification, 1.3 MHz bandwidth, integrated latching comparator, and −4 V to +110 V common-mode range - making it the only single-chip solution qualified for safety-critical high-voltage automotive current sensing with autonomous fault response.

Availability

INA310A2QDGKRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), eTurbo control, and regenerative braking systems requiring stable component supply, long-term automotive lifecycle support, and traceable AEC-Q100-compliant sourcing.

Supply support for INA310A2QDGKRQ1 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 delivering analog and embedded processing solutions, with deep expertise in automotive-grade signal conditioning and functional safety design.

The INA310x-Q1 product line targets high-reliability automotive current sensing, specifically engineered for ASIL-B/C-compliant overcurrent protection in electrified powertrain systems including EPS, eTurbo, and 48 V/400 V hybrid/EV architectures.

FAQ

What is the maximum common-mode voltage the INA310A2QDGKRQ1 can withstand during normal operation?

The INA310A2QDGKRQ1 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, 60 V, or 800 V buses without attenuation networks. Its survival rating extends to −20 V to +120 V, providing margin against load-dump transients and negative cranking events. This specification is validated per AEC-Q100 stress testing protocols.

Does the INA310A2QDGKRQ1 require external components to configure its 50 V/V gain?

No, the INA310A2QDGKRQ1 has a factory-laser-trimmed internal resistor network that fixes its gain at exactly 50 V/V. No external resistors, capacitors, or configuration pins are needed to set or adjust gain. Adding external components to modify gain is not recommended by Texas Instruments, as it degrades accuracy, stability, and temperature performance - the device is optimized for use in its specified 50 V/V configuration.

How does the RESET pin affect comparator behavior in the INA310A2QDGKRQ1?

The RESET pin controls latching mode: when held high (≥1.2 V), the comparator enters latching mode - CMPOUT stays high after overcurrent detection until RESET is pulled low or left floating. When RESET is open or grounded, the comparator operates in transparent mode - CMPOUT follows CMPIN in real time. This dual-mode capability enables flexible fault handling: latching for critical shutdowns, transparent for continuous monitoring with software filtering.

Can the INA310A2QDGKRQ1 be used for bidirectional current sensing?

Yes, the INA310A2QDGKRQ1 supports bidirectional sensing when configured in high-side topology with the shunt placed between battery and load. Its −4 V to +110 V common-mode range accommodates negative voltage excursions during regenerative braking or cranking, and its precision offset (±15 µV) ensures accurate zero-current detection. The output polarity indicates direction: positive VOUT for forward current, negative VOUT (if referenced to mid-supply) or inverted ADC interpretation for reverse flow.

What is the typical propagation delay from shunt overcurrent to CMPOUT assertion in the INA310A2QDGKRQ1?

The total propagation delay from VSENSE exceeding the trip threshold to CMPOUT going low (open-drain active) is 1 µs under small-signal overdrive conditions (20 mV), as specified in the datasheet. This includes amplifier settling, resistor-divider delay, and comparator response. With slew-rate-limited inputs, delay increases to 1.6 µs. This sub-microsecond latency enables protection in fast-switching SiC/GaN inverters where IGBT/MOSFET short-circuit survival time is <2 µs.