Texas Instruments INA296B3QDDFRQ1

Overview

INA296B3QDDFRQ1 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 INA296B3QDDFRQ1 datasheet, INA296B3QDDFRQ1 pinout, INA296B3QDDFRQ1 application, or INA296B3QDDFRQ1 equivalent, this page delivers verified specifications, SOT-23-8 pin functions, automotive-grade thermal performance (R_θJA = 129.7°C/W), functional safety documentation support, and real-world BMS/DC-DC use-case implementation guidance.

Technical Context

The INA296B3QDDFRQ1 employs a zero-drift, precision topology enabling stable bidirectional current measurement across −5V to 110V common-mode voltages independent of its 2.7V–20V supply. Its 50V/V gain is factory-trimmed with ±0.1% max gain error and ±5ppm/°C drift, optimized for low-V_SENSE operation down to millivolt-level shunt drops.

It delivers 1.1MHz small-signal bandwidth and 1µs 1% settling time for fast overcurrent detection in safety-critical automotive subsystems. Input bias current remains constant at 35µA (typ) across full V_CM, eliminating common-mode–dependent leakage errors in high-voltage battery monitoring.

Key Specifications

Pinout & Package

INA296B3QDDFRQ1 is packaged in an 8-pin SOT-23 (DDF) measuring 2.9mm × 2.8mm, optimized for space-constrained automotive modules with exposed pad thermal enhancement.

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 INA296B3QDDFRQ1 uniquely combines AEC-Q100 Grade 0 operation, 1.1MHz bandwidth, and 166dB CMRR in a single SOT-23 package-enabling compact, high-fidelity current sensing in next-generation 48V power architectures where thermal margin and noise immunity are non-negotiable.

Availability

INA296B3QDDFRQ1 is available at Aetrix Electronics and suitable for battery management systems, automotive DC/DC converters, and smart junction boxes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for INA296B3QDDFRQ1 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 deep expertise in automotive-grade signal conditioning and power management ICs.

The INA296x-Q1 product line was designed specifically for high-reliability, high-precision current sensing in AEC-Q100 automotive subsystems-including 48V mild hybrids, electric power steering, and fuel cell controls-where wide V_CM, low drift, and functional safety compliance are mandatory.

FAQ

What is the maximum common-mode voltage the INA296B3QDDFRQ1 can withstand during normal operation?

The INA296B3QDDFRQ1 operates continuously across a common-mode input range of −5V to +110V, independent of its 2.7V–20V supply voltage. This allows direct connection to 48V, 60V, or 72V battery rails in high-side configurations without level-shifting circuitry. The device also survives transient conditions up to −20V and +120V without damage, supporting robustness against load dump and reverse-battery events in automotive environments.

Does the INA296B3QDDFRQ1 support bidirectional current sensing, and how is polarity configured?

Yes, the INA296B3QDDFRQ1 natively supports bidirectional current sensing. Polarity is configured via the REF1 and REF2 pins: connecting both to VS/2 centers the output at mid-supply (e.g., 2.5V on 5V supply), enabling positive and negative V_SENSE to produce corresponding above/below-mid output voltages. This eliminates need for external op-amps or digital post-processing to determine current direction in BMS or regenerative braking circuits.

What is the thermal performance of the INA296B3QDDFRQ1 in its SOT-23-8 (DDF) package?

In the DDF (SOT-23-8) package, the INA296B3QDDFRQ1 has a junction-to-ambient thermal resistance (R_θJA) of 129.7°C/W under standard JEDEC PCB conditions. Its junction-to-board (R_θJB) is 52.6°C/W, indicating strong heat conduction through the exposed pad to the PCB copper. This enables reliable operation at full 150°C ambient when mounted on 2oz copper with thermal vias-critical for engine bay or inverter-integrated placements.

How does the INA296B3QDDFRQ1 achieve low input bias current across its full common-mode range?

The INA296B3QDDFRQ1 uses a proprietary input stage architecture that maintains a constant 35µA (typ) input bias current on both IN+ and IN− pins across the entire −5V to +110V common-mode range. Unlike conventional high-voltage amplifiers where bias current scales with V_CM, this design eliminates V_CM-dependent shunt measurement errors-ensuring consistent accuracy whether monitoring 12V starter loads or 72V traction inverters.

Is functional safety documentation available for the INA296B3QDDFRQ1, and what does it cover?

Yes, Texas Instruments provides comprehensive functional safety documentation for the INA296B3QDDFRQ1, including FMEDA reports, FIT rate calculations (124 failures-in-time), diagnostic coverage analysis, and safety manual guidance. These materials support ISO 26262 ASIL-B and ASIL-C system development by clarifying fault modes, safe failure fraction, and recommended diagnostic strategies-such as monitoring supply voltage, reference pin integrity, and output saturation flags.