Texas Instruments INA296B4IDR

Overview

INA296B4IDR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for 48V high-voltage power systems. It operates over −5V to 110V common-mode range, delivers 100V/V fixed gain, 1.1MHz bandwidth, 8V/µs slew rate, and ±150µV max input offset voltage-enabling accurate DC and transient current monitoring in high-side or low-side shunt configurations within 48V BMS and DC/DC converters.

For engineers reviewing the INA296B4IDR datasheet, INA296B4IDR pinout, INA296B4IDR application, or INA296B4IDR equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for precision current sensing in industrial and telecom power systems.

Technical Context

The INA296B4IDR uses a zero-drift, high-common-mode topology that maintains 35µA typical input bias current across its full −20V to 120V survival range and enables operation independent of supply voltage. Its 1.1MHz small-signal bandwidth and 1µs 1% settling time support fast overcurrent detection and transient response in 48V server PSUs and macro RRU power stages.

It features dual reference inputs (REF1/REF2) allowing configurable unidirectional or bidirectional output centering-from ground-referenced to mid-supply-while maintaining ±0.1% max gain error and 130dB min CMRR at 50kHz over −40°C to 125°C.

Key Specifications

Pinout & Package

SOT-23-8 package (DDF), 2.9mm × 2.8mm footprint, thermally enhanced for high-density 48V power board layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A4DR and MAX40056AUB+T, the INA296B4IDR uniquely combines 110V common-mode tolerance, 1.1MHz bandwidth, and ±150µV offset in SOT-23-8-making it the only option for space-constrained, high-voltage, high-speed bidirectional sensing in 48V infrastructure.

Availability

INA296B4IDR is available at Aetrix Electronics and suitable for 48V battery management systems, macro remote radio units, and 48V rack server power distribution requiring stable component supply and long-term production continuity.

Supply support for INA296B4IDR 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 power management ICs.

The INA296x family was designed specifically for high-accuracy, high-speed current sensing in next-generation 48V power architectures-including telecom, data center, and industrial energy storage-where wide common-mode range and nanosecond-level transient fidelity are mandatory.

FAQ

What is the maximum common-mode voltage the INA296B4IDR can withstand during normal operation?

The INA296B4IDR operates continuously over a common-mode input range of −5V to 110V. Its absolute maximum survival rating extends to −20V to 120V, allowing robust handling of bus transients in 48V systems without latch-up or damage. This specification is guaranteed across the full −40°C to 125°C temperature range and applies to both IN+ and IN− pins simultaneously.

How does the INA296B4IDR achieve bidirectional current sensing?

The INA296B4IDR achieves bidirectional sensing through its dual reference inputs (REF1 and REF2). When REF1 is tied to VS and REF2 to GND, the output centers at VS/2-so positive V_SENSE drives output above mid-supply (charge current), and negative V_SENSE drives it below (discharge current). This configuration is explicitly validated for INA296B4IDR in TI's SBOSA04D datasheet Figure 7-1 and Section 7.4.3.

What package options are available for the INA296B4IDR, and which one is in stock?

The INA296B4IDR is orderable in SOT-23-8 (DDF), VSSOP-8 (DGK), and SOIC-8 (D) packages. The "DR" suffix in INA296B4IDR denotes the tape-and-reel SOT-23-8 variant, which is the standard offering stocked by Aetrix Electronics for high-density power board designs requiring minimal footprint and thermal resistance.

Can the INA296B4IDR be used with a 3.3V supply while monitoring a 48V bus?

Yes-the INA296B4IDR operates from 2.7V to 20V supply voltage independently of its −5V to 110V common-mode input range. With a 3.3V VS supply, it accurately measures current across a shunt on a 48V bus and outputs a 0–3.1V analog signal referenced to the same 3.3V rail. Output swing remains compliant: minimum 20mV above GND and 200mV below VS.

What is the typical input bias current of the INA296B4IDR, and why does it matter for shunt selection?

The INA296B4IDR draws 35µA typical input bias current per input pin-constant across its full common-mode range. This low, stable bias minimizes error contribution in high-value shunt resistors (e.g., 5mΩ or higher), preventing measurement inaccuracies caused by leakage paths. For example, with a 5mΩ shunt at 10A, 35µA bias introduces only 0.035% error-critical for precision BMS and test equipment.