Texas Instruments INA296B4QDGKRQ1

Overview

INA296B4QDGKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (−40°C to 125°C) ultra-precise bidirectional current sense amplifier with 100V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, and 8V/µs slew rate. It enables high-speed overcurrent detection and precision DC current monitoring in automotive high-side or low-side shunt configurations.

For engineers reviewing the INA296B4QDGKRQ1 datasheet, INA296B4QDGKRQ1 pinout, INA296B4QDGKRQ1 application, or INA296B4QDGKRQ1 equivalent, key selection criteria include its ±0.1% max gain error, ±150µV max input offset voltage, bidirectional operation capability, functional safety documentation support, and qualification for automotive battery management and DC/DC converter protection.

Technical Context

The INA296B4QDGKRQ1 employs a zero-drift topology with matched input pairs to achieve ±150µV max offset and ±5ppm/°C drift across −40°C to 125°C. Its internal architecture supports common-mode voltages exceeding the 2.7V–20V supply rail-enabling direct high-side sensing at 48V or 12V bus levels without level-shifting.

It delivers 1.1MHz small-signal bandwidth and 1µs settling time to 1%, making it suitable for fast transient detection in automotive power systems. The dual reference inputs (REF1/REF2) allow configurable unidirectional or bidirectional output swing relative to ground or supply rail.

Key Specifications

Pinout & Package

VSSOP-8 package (DGK), 3mm × 4.9mm body, exposed thermal pad (not electrically connected), RoHS-compliant, moisture sensitivity level 2a.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A4QDRQ1 and MAX40056ATA+T, the INA296B4QDGKRQ1 uniquely combines AEC-Q100 Grade 1 qualification, 1.1MHz bandwidth, and −5V to 110V common-mode operation-making it the only option for automotive high-speed, high-voltage bidirectional sensing with functional safety support.

Availability

INA296B4QDGKRQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, 48V DC/DC converters, fuel cell control units, and smart junction boxes requiring stable component supply across extended temperature and voltage ranges.

Supply support for INA296B4QDGKRQ1 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 automotive, industrial, personal electronics, and communications markets.

The INA296x-Q1 product line was designed specifically for high-reliability automotive current sensing-addressing needs for wide common-mode range, bidirectional operation, functional safety compliance, and robustness in harsh electrical environments.

FAQ

What is the maximum common-mode voltage the INA296B4QDGKRQ1 can withstand during transient conditions?

The INA296B4QDGKRQ1 has a survival common-mode voltage rating of −20V to 120V, meaning it can withstand brief transients such as load dump or jump-start events within this range without damage. This exceeds its operational range of −5V to 110V and ensures robustness in 12V/48V automotive systems. The INA296B4QDGKRQ1 maintains functionality throughout this survival range when powered, and its internal protection circuitry prevents latch-up or parametric shift.

How does the INA296B4QDGKRQ1 achieve bidirectional current sensing?

The INA296B4QDGKRQ1 achieves bidirectional current sensing through its dual reference inputs (REF1 and REF2), which configure the output common-mode voltage. When REF1 = VS and REF2 = GND, the output centers at VS/2, enabling symmetric positive/negative swing around that midpoint. This allows the same device to measure charging and discharging currents in battery systems. The INA296B4QDGKRQ1's differential input structure preserves polarity information inherently-no external circuitry or software inversion is needed.

What is the guaranteed gain error specification for the INA296B4QDGKRQ1 over temperature?

The INA296B4QDGKRQ1 guarantees ±0.1% maximum gain error at room temperature and ±5ppm/°C maximum gain error drift over the full −40°C to +125°C operating range. This translates to ≤±0.16% total gain error across temperature for Grade 1 operation. These values are production-tested and specified in the official TI datasheet SBOSA32D, ensuring predictable scaling accuracy in automotive thermal environments without calibration.

Can the INA296B4QDGKRQ1 operate with a 3.3V supply while sensing on a 48V bus?

Yes, the INA296B4QDGKRQ1 can operate with a 3.3V supply while accurately sensing current on a 48V bus. Its common-mode input range (−5V to 110V) is fully independent of the supply voltage (2.7V to 20V). The output will swing between ~8mV and ~3.1V (VS − 200mV), preserving signal integrity. This decoupling eliminates need for level shifters or isolated supplies-simplifying design in space-constrained automotive modules using the INA296B4QDGKRQ1.

What package type and thermal performance does the INA296B4QDGKRQ1 use?

INA296B4QDGKRQ1 uses the DGK (VSSOP-8) package: 3mm × 4.9mm body with exposed thermal pad. Its junction-to-ambient thermal resistance (RθJA) is 167.2°C/W, and junction-to-board (RθJB) is 88.9°C/W. For continuous 2.5mA operation at 125°C ambient, PCB copper area under the thermal pad is recommended to maintain junction temperature below 150°C. The DGK package supports automated optical inspection and fine-pitch reflow, aligning with automotive manufacturing standards for the INA296B4QDGKRQ1.