Texas Instruments INA296B3IDR

Overview

INA296B3IDR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for 48V high-side or inline sensing in DC/DC converters and battery management systems. It operates over −5V to 110V common-mode voltage, delivers 50V/V fixed gain, achieves 1.1MHz bandwidth and 8V/µs slew rate, and maintains ±150µV max input offset with ±0.5µV/°C drift across −40°C to +125°C.

For engineers reviewing the INA296B3IDR datasheet, INA296B3IDR pinout, INA296B3IDR application, or INA296B3IDR equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-chain support specific to the SOT-23-8 packaged INA296B3IDR variant.

Technical Context

The INA296B3IDR implements a zero-drift, high-voltage input stage enabling operation beyond its 2.7V–20V supply rail-supporting −5V to 110V common-mode inputs independent of VS. Its multistage architecture sustains 1.1MHz small-signal bandwidth and 1µs 1% settling time at all gains, including the 50V/V gain of this variant.

It uses dual reference inputs (REF1/REF2) to configure unidirectional or bidirectional output centering, with internal precision resistor matching ensuring ≤±0.15% reference divider error. Input bias current remains constant at 35µA (typ) across the full common-mode range-unaffected by VCM up to 110V.

Key Specifications

Pinout & Package

INA296B3IDR is housed in an 8-pin SOT-23 package (DDF), measuring 2.9mm × 2.8mm with 0.65mm pitch. The package supports thermal performance up to 129.7°C/W junction-to-ambient and is RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3DR and MAX40056ASA+T, the INA296B3IDR uniquely combines 110V common-mode tolerance, 1.1MHz bandwidth, and ±150µV offset in a SOT-23-8 package-making it the only option qualified for 48V telecom rectifier and high-density server PSU designs demanding simultaneous precision, speed, and voltage margin.

Availability

INA296B3IDR is available at Aetrix Electronics and suitable for 48V DC/DC converter design, 48V battery management systems, and macro remote radio unit (RRU) development requiring stable component supply and long-term production continuity.

Supply support for INA296B3IDR 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 expertise in precision signal conditioning and high-voltage interface ICs.

The INA296x product line was designed specifically for high-accuracy, high-speed current sensing in next-generation 48V power architectures-including datacenter PSUs, EV charging infrastructure, and 5G base station power systems.

FAQ

What is the maximum common-mode voltage the INA296B3IDR can withstand during transient events?

The INA296B3IDR has a survival rating of −20V to 120V common-mode voltage, meaning it withstands short-duration transients up to 120V without damage-even when operating outside its functional −5V to 110V range. This protects the device during lightning-induced surges or inductive kickback in 48V telecom rectifiers. The INA296B3IDR maintains functionality throughout normal operation within its specified −5V to 110V window.

Can the INA296B3IDR be used for unidirectional current sensing, and how is it configured?

Yes, the INA296B3IDR supports unidirectional sensing by connecting both REF1 and REF2 pins to either GND (for ground-referenced output) or V_S (for supply-referenced output). When tied to GND, the output rises from 20mV with positive current flow; when tied to V_S, the output falls toward GND with negative current polarity. This eliminates need for external op-amps or level shifters in single-direction applications like input current monitoring in AC/DC front-ends. The INA296B3IDR's architecture ensures stable operation in both configurations.

What is the minimum shunt resistance compatible with the INA296B3IDR at full-scale 200A measurement?

With its 50V/V gain and 1.1V full-scale output (assuming 5V supply and mid-rail referencing), the INA296B3IDR resolves 22mV across the shunt at 200A-requiring a 110µΩ shunt. However, practical layout constraints (thermal EMF, parasitic inductance) and noise floor (39nV/√Hz input noise) recommend ≥250µΩ for stable 200A measurement. At 250µΩ, the INA296B3IDR produces 2.5V output swing for 200A, staying well within its 0.02V–4.8V linear output range on a 5V rail. The INA296B3IDR's low offset ensures minimal error even at this scale.

Does the INA296B3IDR require external compensation components for stability?

No, the INA296B3IDR is internally compensated and operates stably with capacitive loads up to 1nF-no external compensation networks are needed. Its 1.1MHz bandwidth and 8V/µs slew rate are guaranteed without added RC networks. Layout best practices (short traces to REF1/REF2, local 100nF V_S decoupling, Kelvin shunt connections) are sufficient to maintain stability in high-noise 48V environments. The INA296B3IDR's architecture eliminates tuning effort typically required with discrete current sense solutions.

How does the INA296B3IDR's input bias current behave across temperature and common-mode voltage?

The INA296B3IDR maintains a constant 35µA typical input bias current across −40°C to +125°C and −20V to +120V common-mode voltage-unlike competing amplifiers whose bias current scales with V_CM. This stability prevents gain error drift in high-impedance shunt networks (e.g., 1Ω BMS cell monitors) and ensures predictable performance during cold-start or overvoltage conditions. Measured bias current variation is <±5µA over full range, directly contributing to the INA296B3IDR's ±0.1% gain accuracy specification.