Texas Instruments INA310B5QDGKRQ1

Overview

INA310B5QDGKRQ1 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 500 V/V fixed gain, −4 V to +110 V common-mode input range, 1.3 MHz bandwidth, and ±150 µV max offset voltage - enabling accurate, fast overcurrent detection in eTurbo, EPS, and regenerative braking circuits.

For engineers reviewing the INA310B5QDGKRQ1 datasheet, INA310B5QDGKRQ1 pinout, INA310B5QDGKRQ1 application, or INA310B5QDGKRQ1 equivalent, key selection criteria include its 500 V/V gain accuracy (±0.5% max), latching comparator functionality, survival voltage up to +120 V, 1 µs propagation delay, and VSSOP-8 package compatibility with high-density automotive PCB layouts.

Technical Context

The INA310B5QDGKRQ1 employs a zero-drift, precision topology that maintains ±150 µV max input offset and ±1 µV/°C drift across −40°C to +125°C, while supporting differential sense inputs up to ±12 V and common-mode voltages independent of its 2.7 V–20 V supply. Its 1.3 MHz bandwidth at 500 V/V gain enables sub-microsecond response to fast transient overcurrent events.

Integrated comparator features 0.6 V internal reference with ±20 mV total threshold variation (−40°C to +125°C), 8 mV hysteresis, and RESET-controlled latching mode - allowing configurable fault-hold behavior without external logic. Input bias current remains stable at ≤20 µA across full common-mode range, minimizing shunt measurement error in high-impedance sensing paths.

Key Specifications

Pinout & Package

VSSOP-8 package (3.00 mm × 4.90 mm), thermally enhanced for automotive under-hood operation; 0.65 mm pitch, exposed thermal pad optional per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA310B5QDGKRQ1, INA240A5QDRQ1 reduces component count only if comparator functions are handled elsewhere, while MAX40056ATA+T trades integration for raw speed - neither provides the same single-chip, AEC-Q100-compliant, latching OCP solution for compact automotive power modules.

Availability

INA310B5QDGKRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), eTurbo control, and regenerative braking systems requiring stable component supply across extended automotive production lifecycles.

Supply support for INA310B5QDGKRQ1 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 deep expertise in automotive-grade signal conditioning and power management ICs.

The INA310x-Q1 product line was engineered specifically for ASIL-B/C automotive current sensing - integrating precision amplification, fast comparator response, and AEC-Q100 reliability into a single VSSOP-8 package for next-generation electrified powertrains.

FAQ

What is the maximum common-mode voltage the INA310B5QDGKRQ1 can withstand during transient conditions?

The INA310B5QDGKRQ1 supports a survival voltage range of −20 V to +120 V on IN+ and IN− pins, verified per AEC-Q100 stress testing. This enables robust operation during automotive load-dump events (up to +120 V) and reverse-battery conditions (down to −20 V) without latch-up or permanent damage - critical for under-hood ECUs where transient suppression is limited.

How does the RESET pin affect comparator behavior in the INA310B5QDGKRQ1?

In the INA310B5QDGKRQ1, the RESET pin controls comparator latching: when held high (≥1.2 V), it enables latching mode - CMPOUT stays asserted after overcurrent detection until RESET is pulled low or left floating. When open or grounded, the comparator operates in transparent mode, tracking CMPIN continuously. This dual-mode flexibility supports both momentary fault reporting and persistent safety shutdown per ISO 26262 requirements.

Can the INA310B5QDGKRQ1 be used for bidirectional current sensing?

Yes - the INA310B5QDGKRQ1 supports bidirectional sensing by reversing the connection of IN+ and IN− relative to the shunt resistor. Its symmetric input architecture and rail-to-rail output swing (within 20 mV of GND and 150 mV of VS) allow accurate measurement of both positive and negative current flow, making it suitable for regenerative braking and starter/generator applications where current direction changes dynamically.

What is the minimum shunt voltage (VSENSE) resolvable by the INA310B5QDGKRQ1 at full gain?

At 500 V/V gain, the INA310B5QDGKRQ1's minimum resolvable VSENSE is constrained by its output swing to GND (VSN), specified as +5 mV to +20 mV. Dividing by gain yields a theoretical minimum VSENSE of 10 µV to 40 µV - but practical resolution is limited by ±150 µV offset and 50 nV/√Hz input noise. For reliable 1% accuracy, VSENSE should exceed ~300 µV, enabling precise measurement with 0.5 mΩ shunts at 600 mA full scale.

Does the INA310B5QDGKRQ1 require external components for basic operation?

For basic current amplification, only VS decoupling (0.1 µF ceramic + 10 µF tantalum) and GND layout are mandatory. To use the comparator, an external resistor divider from OUT to CMPIN and pull-up resistor from CMPOUT to VS (or another rail) are required. The internal 0.6 V reference eliminates need for external reference IC, and RESET may be left unconnected for transparent mode - minimizing external parts count versus discrete comparator solutions.