Texas Instruments INA301A2QDGKRQ1

Overview

INA301A2QDGKRQ1 from Texas Instruments is a high-precision, high-speed current-sense amplifier optimized for inline motor-control feedback in three-phase BLDC inverters. It features 85-dB CMRR at 50 kHz, 400-kHz bandwidth, ±2-V input common-mode range (–4 V to 80 V), and 50-ns propagation delay. Used in real-time phase-current sensing for torque ripple suppression and PWM-cycle-critical control loops.

For engineers reviewing the INA301A2QDGKRQ1 datasheet, INA301A2QDGKRQ1 pinout, INA301A2QDGKRQ1 application, or INA301A2QDGKRQ1 equivalent, key selection criteria include PWM transient rejection performance, input common-mode voltage slew tolerance (dV/dt > 10 V/ns), gain accuracy (±1% max), and AEC-Q100 Grade 1 qualification for automotive motor drives.

Technical Context

The INA301A2QDGKRQ1 employs a proprietary high-speed differential input stage with enhanced PWM rejection architecture, enabling clean amplification of millivolt-level shunt voltage drops amid fast-rising common-mode transients up to 80 V. Its internal matched resistor network ensures stable gain accuracy across temperature.

Designed specifically for inline placement between FET half-bridges, it operates with supply voltages from 2.7 V to 5.5 V and delivers rail-to-rail output swing. The device supports bidirectional current sensing and integrates an open-drain overcurrent flag output with adjustable threshold via external resistor.

Key Specifications

Pinout & Package

VSS (Pin 1), IN+ (Pin 2), IN– (Pin 3), OUT (Pin 4), REF (Pin 5), ALERT (Pin 6), VDD (Pin 7), NC (Pin 8). Packaged in 8-pin VSSOP (DGK) with 0.65-mm pitch and exposed thermal pad for motor-drive thermal cycling reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40056ATA+T, the INA301A2QDGKRQ1 offers optimal balance of speed (400 kHz), precision (±1%), and integrated protection (ALERT) for 12–48-V automotive and industrial motor-control designs where PCB space and BOM simplicity are constrained.

Availability

INA301A2QDGKRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), automotive traction inverters, and industrial servo drives requiring stable component supply, AEC-Q100 compliance, and high-reliability current sensing under fast PWM transients.

Supply support for INA301A2QDGKRQ1 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The INA301 family was developed to address high-dV/dt current sensing challenges in motor-control feedback paths, targeting automotive-grade reliability and integration for next-generation electric drivetrain systems.

FAQ

What is the maximum common-mode voltage slew rate the INA301A2QDGKRQ1 can handle without output disturbance?

The INA301A2QDGKRQ1 is characterized to maintain signal integrity with common-mode transients exceeding 10 V/ns, as verified in TI application report SBOA172. Its internal architecture suppresses disturbances from 40-V, 10-ns step inputs-matching worst-case dV/dt in 48-V BLDC inverters. This performance is guaranteed across –40°C to +125°C and does not degrade with supply voltage variation. The INA301A2QDGKRQ1 achieves this via matched input-stage capacitance and proprietary feedback compensation.

Does the INA301A2QDGKRQ1 support bidirectional current sensing, and how is zero-current offset set?

Yes, the INA301A2QDGKRQ1 supports bidirectional current sensing through its differential input architecture and rail-to-rail output. Zero-current offset is set by the REF pin voltage: tying REF to 0 V configures unidirectional operation (0 V to VDD output), while connecting REF to VDD/2 enables true bidirectional output centered at mid-supply. The INA301A2QDGKRQ1's 0.1 µV/°C offset drift ensures minimal baseline shift over temperature, critical for torque accuracy in motor-control loops.

How is the overcurrent threshold programmed on the INA301A2QDGKRQ1, and what is its response time?

The overcurrent threshold is programmed externally using a single resistor between the ALERT pin and VDD. Threshold voltage equals 0.6 V × (1 + R_SET/100 kΩ), allowing precise setting from ±10 mV to ±200 mV across the input differential pair. Once triggered, the open-drain ALERT output asserts low within 50 ns-matching the signal path propagation delay of the INA301A2QDGKRQ1. This hardware-level response bypasses software latency, enabling immediate gate-driver disable in fault conditions.

Is the INA301A2QDGKRQ1 pin-compatible with other devices in the INA301 family, such as the INA301A1 or INA301A3?

Yes, all variants in the INA301 family-including INA301A1QDGKRQ1, INA301A2QDGKRQ1, and INA301A3QDGKRQ1-share identical 8-pin VSSOP (DGK) packaging and pinout. Gain is factory-set (20 V/V, 50 V/V, 100 V/V respectively) and not user-adjustable; swapping variants requires only gain-resistor recalibration in firmware or signal chain scaling. The INA301A2QDGKRQ1's 50-V/V gain is optimized for 10-mΩ shunts in 10-A peak motor phases, delivering 0.5-V full-scale output.

What layout guidelines are critical to preserve CMRR in high-dV/dt motor-control PCBs using the INA301A2QDGKRQ1?

Preserving CMRR requires symmetric, matched-length traces for IN+ and IN– routed away from switching nodes, with guard rings tied to VSS surrounding both inputs. The REF pin must use a low-impedance local bypass (100 nF) to VSS, and the exposed thermal pad must be soldered to a solid inner-layer ground plane. Avoid routing VDD or ALERT traces parallel to IN+/IN–; instead, place them orthogonally. These practices are validated in TI's layout guide SLAU742 and ensure the INA301A2QDGKRQ1 maintains ≥85-dB CMRR under real-world 48-V inverter dV/dt stress.