Texas Instruments INA310A5QDGKRQ1

Overview

INA310A5QDGKRQ1 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, 1.3 MHz bandwidth, ±20 µV max offset voltage, and operates across −4 V to +110 V common-mode range with 2.7 V to 20 V supply - enabling fast overcurrent protection in eTurbo, EPS, and regenerative braking circuits.

For engineers reviewing the INA310A5QDGKRQ1 datasheet, INA310A5QDGKRQ1 pinout, INA310A5QDGKRQ1 application, or INA310A5QDGKRQ1 equivalent, this page provides verified technical context, exact pin functions, real-world automotive use cases, and validated alternative options - all grounded in TI's SBOSAD3 production data sheet and official package documentation.

Technical Context

The INA310A5QDGKRQ1 uses a zero-drift precision topology with matched internal resistor network to achieve 0.15% max gain error and 160 dB DC CMRR, maintaining accuracy across −40°C to +125°C. Its input bias current remains flat at 20 µA up to 110 V common-mode voltage - unlike conventional amplifiers where bias current rises with VCM.

It integrates a comparator with 1 µs propagation delay, 8 mV hysteresis, and latching mode controlled by the RESET pin. The comparator threshold is fixed at 0.6 V (±20 mV over temperature), referenced internally and independent of supply - enabling robust trip-point setting via external resistive divider on CMPIN.

Key Specifications

Pinout & Package

VSSOP-8 package (3.00 mm × 4.90 mm), thermally enhanced for automotive under-hood environments; 0.65 mm pitch, exposed thermal pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision automotive current sensing applications.

Compared with INA310B5QDGKRQ1, the INA310A5QDGKRQ1 provides 3.3× tighter gain error and 7.5× lower offset - justifying its use in ASIL-B/C torque and braking control. Versus MAX40056ATA+T, it trades 200 kHz bandwidth for complete single-chip overcurrent protection, reducing PCB area and qualification effort in automotive ECUs.

Availability

INA310A5QDGKRQ1 is available at Aetrix Electronics and suitable for eTurbo actuation, electric power steering (EPS), and regenerative braking systems requiring stable component supply, AEC-Q100 compliance, and functional safety documentation support.

Supply support for INA310A5QDGKRQ1 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 high-reliability automotive current sensing - addressing the need for wide common-mode range, ultra-low drift, integrated protection, and AEC-Q100/functional safety readiness in electrified powertrain systems.

FAQ

What is the maximum common-mode voltage the INA310A5QDGKRQ1 can withstand during transient conditions?

The INA310A5QDGKRQ1 supports −20 V to +120 V survival voltage on IN+ and IN− pins, verified per AEC-Q100 stress testing. This exceeds ISO 7637-2 Pulse 5a requirements for 12 V and 48 V automotive systems, allowing direct connection to high-side shunts without external clamping diodes. The device remains functional within −4 V to +110 V during normal operation.

How does the RESET pin affect comparator behavior in the INA310A5QDGKRQ1?

In the INA310A5QDGKRQ1, the RESET pin controls comparator latching: 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 grounded or open, the comparator operates transparently, updating CMPOUT in real time. This dual-mode capability supports both immediate fault response and persistent diagnostic flagging per ISO 26262 requirements.

Can the INA310A5QDGKRQ1 be used for bidirectional current sensing?

Yes - the INA310A5QDGKRQ1 supports bidirectional sensing when configured with a center-tapped shunt or differential input network. Its −4 V to +110 V common-mode range accommodates negative V_SENSE (reverse current) down to −12 V differential, and the amplifier output swings within 20 mV of GND. However, the integrated comparator is unidirectional (0.6 V threshold), so external circuitry is needed for reverse-current trip detection.

What is the minimum shunt voltage the INA310A5QDGKRQ1 can accurately measure at full temperature range?

At −40°C to +125°C, the INA310A5QDGKRQ1 guarantees ±20 µV offset and ±0.25 µV/°C drift, resulting in ≤±5 µV total offset variation. With 500 V/V gain, this translates to ±10 mV output error - meaning it can resolve shunt voltages ≥20 mV with <5% error. For 20 mΩ shunt, this enables accurate measurement of ≥1 A current across the full automotive temperature range.

Does the INA310A5QDGKRQ1 require external components for basic operation?

Yes - the INA310A5QDGKRQ1 requires a 0.1 µF ceramic decoupling capacitor between VS and GND, placed within 2 mm of the pins. For comparator operation, a pull-up resistor (typically 5.1 kΩ) from CMPOUT to VS or another logic rail is mandatory. An external resistive divider from OUT to CMPIN sets the overcurrent threshold; TI recommends total divider resistance ≤100 kΩ to minimize comparator input bias error.