Texas Instruments INA310B4QDGKRQ1

Overview

INA310B4QDGKRQ1 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 200 V/V fixed gain, −4 V to +110 V common-mode input range, 1.3 MHz bandwidth, and ±30 µV max offset voltage (25°C), enabling fast overcurrent detection in eTurbo, EPS, and regenerative braking circuits.

For engineers reviewing the INA310B4QDGKRQ1 datasheet, INA310B4QDGKRQ1 pinout, INA310B4QDGKRQ1 application, or INA310B4QDGKRQ1 equivalent, key selection criteria include its 200 V/V gain accuracy (±0.5% max), latching comparator mode, 1 µs propagation delay, and VSSOP-8 package compatibility with high-voltage PCB layout constraints in safety-critical automotive subsystems.

Technical Context

The INA310B4QDGKRQ1 employs a zero-drift precision amplifier architecture with matched internal resistive gain network, achieving 160 dB DC CMRR and 2.5 V/µs slew rate to support rapid transient response in high-dV/dt battery and motor drive environments. Its input bias current remains stable at 20 µA across the full −20 V to +120 V survival common-mode range, decoupled from supply voltage (2.7 V–20 V).

The integrated comparator uses a trimmed 0.6 V internal reference with 8 mV hysteresis and supports transparent/latching operation via the RESET pin. Comparator input (CMPIN) accepts 0–5.5 V signals independent of VS, while CMPOUT is open-drain rated to 22 V, enabling direct interface with 3.3 V/5 V/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; exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3QDRQ1, INA310B4QDGKRQ1 integrates comparator and reference to reduce component count and latency; compared with MAX40056ATA+T, it extends common-mode range to +110 V for robustness in 48 V+ regenerative systems, at the cost of slightly lower bandwidth (900 kHz vs. 1.1 MHz).

Availability

INA310B4QDGKRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), eTurbo control, and regenerative braking systems requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for INA310B4QDGKRQ1 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-combining precision amplification, fast comparator response, and extended common-mode operation to replace discrete solutions in EPS, brake, and hybrid powertrain systems.

FAQ

What is the maximum common-mode voltage the INA310B4QDGKRQ1 can withstand during normal operation?

The INA310B4QDGKRQ1 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 and 60 V automotive buses without attenuation networks. Its survival rating extends to −20 V to +120 V, covering load-dump and jump-start transients per ISO 7637-2.

Does the INA310B4QDGKRQ1 require external components to configure the comparator trip point?

Yes-the INA310B4QDGKRQ1 uses an internal 0.6 V reference but requires an external resistor divider from OUT to CMPIN to scale the amplified shunt voltage to the comparator threshold. TI recommends keeping the total divider resistance below 100 kΩ to minimize comparator input bias current error and maintain trip accuracy within ±20 mV.

How does the RESET pin affect comparator behavior in the INA310B4QDGKRQ1?

The RESET pin configures the comparator's functional mode: when pulled low or left open (via internal 2 MΩ pulldown), the comparator operates in transparent mode with immediate output toggling; when pulled high to VS, it enters latching mode-CMPOUT stays asserted after overcurrent detection until RESET is actively pulled low. This supports fail-safe shutdown in brake and steering systems.

What is the guaranteed offset voltage specification for the INA310B4QDGKRQ1 over temperature?

The INA310B4QDGKRQ1 guarantees ±150 µV maximum offset voltage over the full operating temperature range of −40°C to +125°C, with ±1 µV/°C drift. At 25°C, the limit is tighter: ±30 µV max. This performance is achieved through zero-drift chopper stabilization and is validated per AEC-Q100 stress testing protocols.

Can the INA310B4QDGKRQ1 be used in low-side current sensing configurations?

Yes-the INA310B4QDGKRQ1 supports both high-side and low-side shunt configurations. For low-side use, connect IN+ to the load side of the shunt and IN− to system ground. Its −4 V to +110 V common-mode range accommodates ground-referenced sensing while maintaining immunity to supply noise and enabling accurate bidirectional current measurement in regenerative braking.