Texas Instruments INA310A3QDGKRQ1

Overview

INA310A3QDGKRQ1 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 100 V/V fixed gain, −4 V to +110 V common-mode input range, 1.3 MHz bandwidth, and ±10 µV max offset voltage (25°C), enabling fast, accurate overcurrent detection in eTurbo, EPS, and regenerative braking circuits.

For engineers reviewing the INA310A3QDGKRQ1 datasheet, INA310A3QDGKRQ1 pinout, INA310A3QDGKRQ1 application, or INA310A3QDGKRQ1 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 INA310A3QDGKRQ1 employs a zero-drift precision amplifier architecture with 160 dB DC CMRR and 2.5 V/µs slew rate, enabling stable operation across its full −4 V to +110 V common-mode range independent of supply voltage. Its input bias current remains flat at 20 µA up to 110 V, eliminating voltage-dependent leakage errors common in high-voltage sensing.

It integrates a comparator with 1 µs propagation delay, 8 mV hysteresis, and latching capability controlled by the RESET pin - allowing transparent or fault-latched behavior without external logic. The 0.6 V internal reference and CMPIN input support externally set trip thresholds via resistor dividers, with accuracy preserved by limiting total divider resistance to ≤100 kΩ.

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 current sense amplifier applications.

Compared with INA240A3QDRQ1, INA310A3QDGKRQ1 reduces component count and improves fault response time via integrated comparator; compared with MAX40056ATA+T, it extends common-mode range by 45 V and meets AEC-Q100 Grade 1 - essential for 48 V hybrid architectures and engine compartment placement.

Availability

INA310A3QDGKRQ1 is available at Aetrix Electronics and suitable for eTurbo control, electric power steering (EPS), and regenerative braking systems requiring stable component supply, AEC-Q100 compliance, and functional safety documentation support.

Supply support for INA310A3QDGKRQ1 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 AEC-Q100 qualification to replace discrete op-amp + comparator solutions in EPS, brake, and 48 V mild-hybrid systems.

FAQ

What is the maximum common-mode voltage the INA310A3QDGKRQ1 can handle during continuous operation?

The INA310A3QDGKRQ1 supports a continuous operational common-mode input range of −4 V to +110 V, independent of supply voltage. This allows direct connection to 48 V or 60 V bus lines without level-shifting. Its survival rating extends to −20 V to +120 V, providing margin against transients. The specification is validated across the full −40°C to +125°C temperature range per AEC-Q100 testing.

How does the RESET pin affect comparator behavior in the INA310A3QDGKRQ1?

The RESET pin on the INA310A3QDGKRQ1 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, it operates in transparent mode - CMPOUT tracks CMPIN in real time. The internal 2 MΩ pulldown ensures safe default behavior if left unconnected.

Can the INA310A3QDGKRQ1 be used for low-side current sensing, and what are the layout considerations?

Yes, the INA310A3QDGKRQ1 supports low-side sensing by connecting IN+ to the load side and IN− to ground. Layout must minimize ground path impedance between GND pin and shunt ground return to preserve CMRR. Avoid routing high-current traces near IN+ or IN−; use Kelvin connections to the shunt. The 160 dB CMRR ensures <1 µV error from 1 V ground bounce at 50 kHz.

What is the accuracy impact of using an external resistor divider on the CMPIN pin of the INA310A3QDGKRQ1?

Using an external resistor divider on CMPIN introduces gain error dependent on resistor tolerance and temperature drift. TI recommends keeping total divider resistance ≤100 kΩ to minimize comparator input bias current (≤20 nA near 0.6 V) effects. With 0.1% resistors, trip point accuracy remains within ±0.5% - sufficient for most automotive overcurrent thresholds. Higher resistance degrades accuracy due to I_BCMPIN voltage drop.

Does the INA310A3QDGKRQ1 require external compensation components for stability?

No, the INA310A3QDGKRQ1 is internally compensated and stable with capacitive loads up to 500 pF. No external compensation is needed for standard PCB layouts. However, if driving long traces (>10 cm) or high-capacitance ADC inputs, a small series resistor (10–50 Ω) at the OUT pin is recommended to isolate capacitance and prevent peaking. Bandwidth remains ≥1.0 MHz under these conditions.