Texas Instruments INA280A5QDCKRQ1

Overview

INA280A5QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40 °C to +125 °C) high-precision unidirectional current sense amplifier optimized for automotive high-side sensing. It delivers 500 V/V fixed gain, 1.1 MHz bandwidth at lower gains (800 kHz at 500 V/V), ±150 µV max input offset, ±0.5% max gain error, and operates from 2.7 V to 20 V supply across a 2.7–120 V common-mode range - enabling accurate LiDAR pulse-current monitoring and fast overcurrent protection in 48-V HVAC compressors.

For engineers reviewing the INA280A5QDCKRQ1 datasheet, INA280A5QDCKRQ1 pinout, INA280A5QDCKRQ1 application, or INA280A5QDCKRQ1 equivalent, this page provides verified technical context, validated pin functions, real-world automotive use cases, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The INA280A5QDCKRQ1 employs a transconductance architecture with current-feedback amplifier topology, enabling 20 µA typical input bias current even at 120 V common-mode voltage and restricting operation to high-side-only sensing. Its internal precision resistor network fixes gain at 500 V/V with ≤20 ppm/°C drift and supports unidirectional current flow only - no bidirectional or low-side configurations.

It achieves 85-dB AC CMRR at 50 kHz and 120-dB minimum DC CMRR, with output swing limited to GND + 25 mV (min) and VS – 200 mV (max) under load. Bandwidth is gain-dependent: 800 kHz at 500 V/V with 2 V/µs slew rate, enabling sub-2 µs response to 75-A threshold events on a 2-mΩ shunt at 5 V supply.

Key Specifications

Pinout & Package

INA280A5QDCKRQ1 is housed in a space-constrained SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, with 5 terminals arranged in a single row. The footprint occupies only 2.0 mm × 2.1 mm on PCB, supporting high-density automotive ECU layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA280A5QDCKRQ1, INA240A5QDRQ1 offers configurable gain and bidirectional capability at the cost of bandwidth and CMRR, while MAX40056ATA+T trades Grade 1 qualification and safety documentation for higher speed - making INA280A5QDCKRQ1 the optimal choice for AEC-Q100-compliant, safety-aware high-side sensing in demanding thermal environments.

Availability

INA280A5QDCKRQ1 is available at Aetrix Electronics and suitable for automotive HVAC compressors, solid-state LiDAR systems, interior/parking heater modules, and 48-V electric pump control requiring stable component supply across extended temperature and safety-critical validation cycles.

Supply support for INA280A5QDCKRQ1 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 decades of automotive-grade IC development and AEC-Q100 qualification expertise.

The INA280-Q1 product line delivers high-precision, high-bandwidth current sensing for next-generation automotive electrification - targeting high-side monitoring in 48-V mild-hybrid systems, battery management, and safety-critical motor control.

FAQ

What is the maximum common-mode voltage the INA280A5QDCKRQ1 can measure?

The INA280A5QDCKRQ1 supports an operational common-mode input range of 2.7 V to 120 V, with survival capability up to −20 V and +122 V. This allows direct sensing on 48-V battery rails and high-voltage traction inverters without external level-shifting circuitry. The device's internal topology restricts use to high-side configurations only - it cannot be used for low-side or bidirectional sensing.

Does the INA280A5QDCKRQ1 support bidirectional current sensing?

No, the INA280A5QDCKRQ1 is strictly unidirectional and designed only for high-side current measurement. Its internal transconductance architecture and pin configuration (IN+ connected to supply side, IN− to load side) do not support reverse current flow detection. For bidirectional applications, TI recommends the INA240-Q1 family, which features symmetric input structure and dual-supply capability.

What is the bandwidth of the INA280A5QDCKRQ1 at its 500 V/V gain setting?

At 500 V/V gain, the INA280A5QDCKRQ1 has a −3-dB bandwidth of 800 kHz when loaded with 5 pF and driven with an 8-mV differential input. This bandwidth enables accurate capture of fast transients in automotive overcurrent protection - for example, responding to a 75-A fault on a 2-mΩ shunt in under 2 µs. Bandwidth decreases with higher capacitive loads or lower input signal amplitudes.

How does the INA280A5QDCKRQ1 handle input offset drift over temperature?

The INA280A5QDCKRQ1 specifies a maximum input offset drift of ±1 µV/°C across −40 °C to +125 °C. At 125 °C, this contributes ≤105 µV additional offset beyond room-temperature value - maintaining total offset within ±255 µV. This stability enables consistent current measurement accuracy in under-hood environments without periodic recalibration, unlike many non-automotive amplifiers with >5 µV/°C drift.

Is the INA280A5QDCKRQ1 pin-compatible with other members of the INA280-Q1 family?

Yes, all INA280-Q1 variants - including INA280A1QDCKRQ1 (20 V/V), INA280A2QDCKRQ1 (50 V/V), INA280A3QDCKRQ1 (100 V/V), INA280A4QDCKRQ1 (200 V/V), and INA280A5QDCKRQ1 (500 V/V) - share identical SC-70 (DCK) 5-pin packaging and pinout. Gain is set internally; no external resistors or configuration pins are required. This allows seamless gain optimization via part number selection without PCB redesign.