Texas Instruments INA296B3QDGKRQ1

Overview

INA296B3QDGKRQ1 from Texas Instruments is an AEC-Q100 Grade 0 ultra-precise bidirectional current sense amplifier for automotive high-side/low-side shunt monitoring, featuring 50V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, 8V/µs slew rate, and ±150µV max input offset voltage over −40°C to +150°C ambient.

For engineers reviewing the INA296B3QDGKRQ1 datasheet, INA296B3QDGKRQ1 pinout, INA296B3QDGKRQ1 application, or INA296B3QDGKRQ1 equivalent, this page delivers verified functional safety-capable specifications, package-specific terminal roles, real-world BMS and DC/DC converter use cases, and validated alternative options for high-voltage precision current measurement.

Technical Context

The INA296B3QDGKRQ1 employs a zero-drift, high-common-mode topology enabling operation beyond supply rails (−5V to 110V CM) while maintaining 166dB typical CMRR and 1.1MHz small-signal bandwidth across all gains. Its dual reference inputs (REF1/REF2) support configurable unidirectional or bidirectional output centering without external components.

It draws 2.5mA quiescent current from 2.7V–20V supply, delivers rail-to-rail output swing (VS − 0.2V min), and sustains ±150µV offset with ±500nV/°C drift over −40°C to +150°C - meeting Grade 0 automotive thermal requirements for under-hood battery management and junction box control.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected), RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3QDRQ1 and MAX40056ATA+T, the INA296B3QDGKRQ1 uniquely combines AEC-Q100 Grade 0 qualification, 1.1MHz bandwidth, and −5V to 110V common-mode operation - making it the only option qualified for under-hood 48V BMS and smart junction box designs requiring simultaneous high precision, speed, and thermal robustness.

Availability

INA296B3QDGKRQ1 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 high-reliability production cycles.

Supply support for INA296B3QDGKRQ1 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 design expertise and ISO/TS 16949-certified manufacturing.

The INA296x-Q1 product line was engineered specifically for high-voltage, high-precision current sensing in next-generation electric vehicle power systems - delivering AEC-Q100 Grade 0 reliability, functional safety readiness, and ultra-low drift performance in compact VSSOP-8 packaging.

FAQ

What is the maximum common-mode voltage the INA296B3QDGKRQ1 can withstand during transient conditions?

The INA296B3QDGKRQ1 supports a survival common-mode voltage range of −20V to +120V, meaning it can endure automotive load-dump transients and jump-start surges without damage or latch-up. This exceeds the operational range (−5V to +110V) and eliminates the need for external TVS diodes in most 48V system designs. The device remains fully functional throughout these events when powered within its 2.7V–20V supply range.

How does the INA296B3QDGKRQ1 achieve bidirectional current sensing without external components?

The INA296B3QDGKRQ1 achieves true bidirectional sensing by using its dual reference inputs (REF1 and REF2). When both are biased at VS/2, the output centers at VS/2 and swings above/below that point depending on current direction. No external op-amps, resistors, or level-shifters are required - the internal reference divider and zero-drift amplifier handle polarity reversal intrinsically. This simplifies PCB layout and improves accuracy versus discrete solutions.

Is the INA296B3QDGKRQ1 pin-compatible with other members of the INA296x-Q1 family?

Yes - all INA296x-Q1 variants in VSSOP-8 (DGK) packaging, including INA296B3QDGKRQ1, share identical pinout, footprint, and thermal pad configuration. Gain selection is internal and fixed per part number; swapping to INA296B2QDGKRQ1 (20V/V) or INA296B4QDGKRQ1 (100V/V) requires only firmware gain-scaling updates, not PCB revision. This enables scalable current-sense design across voltage/current ranges.

What is the output voltage swing limitation of the INA296B3QDGKRQ1 at 150°C ambient?

At TA = −40°C to +150°C, the INA296B3QDGKRQ1 guarantees output swing from ≥8mV above GND to ≤VS − 0.2V, regardless of supply voltage (2.7V–20V) or common-mode input. This rail-to-rail capability ensures full dynamic range utilization into standard 12-bit or 16-bit SAR ADCs without external level-shifting, even in extreme under-hood environments where thermal derating would otherwise compress usable output range.

Does the INA296B3QDGKRQ1 require external filtering for EMI suppression in high-noise automotive environments?

The INA296B3QDGKRQ1 integrates high CMRR (130dB typ) and PSRR (≥105dB) inherently, minimizing need for external RC filters. However, TI recommends a 1µF X7R ceramic capacitor placed ≤2mm from VS and GND pins, plus optional 100Ω series resistor + 1nF capacitor on IN+/IN− if located near high-dI/dt traces. These measures reduce RF rectification effects without degrading 1.1MHz bandwidth - confirmed in TI's SBOA32D layout guidelines.