Texas Instruments INA290A3QDCKRQ1

Overview

INA290A3QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) ultra-precise current sense amplifier optimized for high-side sensing in automotive power systems. It delivers 100 V/V fixed gain, ±12 µV max input offset voltage, ±0.1% max gain error, 1.1-MHz bandwidth at 20 V/V (900 kHz at 100 V/V), and operates across 2.7 V to 120 V common-mode voltage - enabling accurate shunt-based current monitoring in HVAC compressor modules and solid-state LiDAR power stages.

For engineers reviewing the INA290A3QDCKRQ1 datasheet, INA290A3QDCKRQ1 pinout, INA290A3QDCKRQ1 application, or INA290A3QDCKRQ1 equivalent, this page provides verified technical context, real-world design meaning of key specs, SC-70 package terminal mapping, functional alternatives with documented differences, and supply-chain support details specific to the A3 gain variant.

Technical Context

The INA290A3QDCKRQ1 uses 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 unidirectional current sensing. Its zero-drift input stage achieves ±0.2 µV/°C offset drift and 160-dB DC CMRR, while the internal precision resistor network fixes gain at 100 V/V with ±5 ppm/°C drift.

It supports fast overcurrent detection via 2 V/µs slew rate and sub-2 µs response time (e.g., 75-A threshold on 2-mΩ shunt), with output swing to within 70 mV of VS and 25 mV of GND under full temperature range. The device requires no external gain-setting components and is not configurable for bidirectional sensing.

Key Specifications

Pinout & Package

The INA290A3QDCKRQ1 is housed in a 5-pin SC-70 package (2.00 mm × 1.25 mm body, 2.0 mm × 2.1 mm PCB footprint), optimized for space-constrained automotive modules including interior heater control boards and pump driver assemblies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3QDCKRQ1 and MAX40056ATA+T, the INA290A3QDCKRQ1 uniquely balances 900-kHz bandwidth, ±12-µV offset, and AEC-Q100 Grade 1 qualification - making it optimal for automotive interior heater modules requiring both precision and rapid fault response without package size compromise.

Availability

INA290A3QDCKRQ1 is available at Aetrix Electronics and suitable for automotive HVAC compressor modules, solid-state LiDAR power stages, interior heater modules, and parking heater modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for INA290A3QDCKRQ1 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 product development and AEC-Q100 validation expertise.

The INA290-Q1 product line delivers ultra-precise, high-voltage current sensing for next-generation automotive electrification systems - designed specifically for high-side monitoring in 12-V, 24-V, and 48-V battery architectures with functional safety support.

FAQ

What is the maximum common-mode voltage the INA290A3QDCKRQ1 can measure?

The INA290A3QDCKRQ1 supports an operational common-mode input voltage range from 2.7 V to 120 V, with survival capability up to +122 V and down to –20 V. This allows direct connection to 48-V battery rails and compatibility with load-dump transients in automotive 12-V systems. The minimum usable VCM depends on supply voltage per Figure 7-1 in the datasheet - for example, at VS = 5 V, VCM must be ≥2.7 V to operate.

Does the INA290A3QDCKRQ1 support bidirectional current sensing?

No, the INA290A3QDCKRQ1 operates in unidirectional mode only, as confirmed by its functional block diagram and Section 7.4.1 of the datasheet. It measures current flowing from supply to load (high-side sensing) and cannot resolve direction reversal. For bidirectional applications, TI recommends the INA229 or similar devices explicitly specified for that function.

What is the output voltage swing capability of the INA290A3QDCKRQ1?

The INA290A3QDCKRQ1 output swings to within 70 mV of the VS supply rail and to within 25 mV of GND across –40°C to +125°C, per Electrical Characteristics Table 6.5. At VS = 5 V, this yields a usable output range of approximately 0.025 V to 4.93 V - sufficient to drive most 12-bit ADCs directly without rail-to-rail op-amp buffering.

How does the bandwidth of the INA290A3QDCKRQ1 compare to other gain variants?

At 100 V/V gain, the INA290A3QDCKRQ1 has a –3-dB bandwidth of 900 kHz (vs 1.1 MHz for A1/A2 variants), as specified in Table 6.5. This represents an 18% reduction versus the 20-V/V version but retains sufficient speed for most automotive protection functions - such as detecting 75-A faults on 2-mΩ shunts in under 2 µs - while providing higher signal gain for improved SNR in low-current sensing.

Is external gain-setting required for the INA290A3QDCKRQ1?

No, the INA290A3QDCKRQ1 features a factory-trimmed internal resistor network that fixes gain at exactly 100 V/V. Table 7-1 confirms R1 = 10 kΩ and RL = 1000 kΩ for the A3 variant. TI explicitly advises against adding external resistors to modify gain, as absolute resistor values vary significantly between units - only the ratio is precision-matched.