Texas Instruments INA296B5IDDFR

Overview

INA296B5IDDFR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier with 200V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, and ±150µV max input offset voltage. It operates from 2.7V to 20V supply and delivers 8V/µs slew rate for fast overcurrent detection in high-voltage DC/DC converters and 48V BMS.

For engineers reviewing the INA296B5IDDFR datasheet, INA296B5IDDFR pinout, INA296B5IDDFR application, or INA296B5IDDFR equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for precision high-side/low-side current monitoring in industrial and telecom power systems.

Technical Context

The INA296B5IDDFR uses a zero-drift, high-common-mode architecture enabling operation beyond its supply rails - supporting −5V to 110V V_CM independent of 2.7V–20V V_S. Its 1.1MHz small-signal bandwidth and 1µs 1% settling time are maintained across all gains, including 200V/V.

It features dual reference inputs (REF1/REF2) that set output mid-point voltage via Equation V_OUT = G × (V_IN+ − V_IN−) + (V_REF1 + V_REF2)/2, enabling configurable unidirectional or bidirectional output swing without external op-amps.

Key Specifications

Pinout & Package

INA296B5IDDFR is packaged in an 8-pin SOT-23 (DDF) measuring 2.9mm × 2.8mm, optimized for space-constrained high-density PCB layouts in telecom and server power applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA296B5IDDFR, INA240A5IDR trades 30V V_CM headroom and 4× slower slew for lower cost, while MAX40056ASA+T offers marginally higher bandwidth but lacks integrated reference flexibility - both require design compromises in 110V-tolerant or compact bidirectional systems.

Availability

INA296B5IDDFR is available at Aetrix Electronics and suitable for 48V DC/DC converters, 48V battery management systems, and macro remote radio units requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for INA296B5IDDFR 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 chain solutions.

The INA296x family was designed specifically for high-accuracy, high-speed current sensing in next-generation 48V power architectures - targeting telecom infrastructure, data center PSUs, and electric vehicle subsystems demanding robustness at extreme common-mode voltages.

FAQ

What is the maximum common-mode voltage the INA296B5IDDFR can withstand during operation?

The INA296B5IDDFR operates continuously over a common-mode input range of −5V to 110V. Its survival rating extends to −20V to 120V, meaning it tolerates brief transients within that range without damage. This makes INA296B5IDDFR suitable for 48V systems with high dV/dt noise or negative rail excursions, such as in regenerative braking circuits where bus voltage dips below ground.

How does the REF1 and REF2 pin configuration affect bidirectional current measurement in the INA296B5IDDFR?

For bidirectional operation, INA296B5IDDFR requires REF1 and REF2 to be biased at different potentials - typically REF1 = V_S and REF2 = GND - establishing V_OUT = 100×(V_IN+ − V_IN−) + V_S/2. This centers the output at mid-supply, allowing positive current to raise V_OUT above V_S/2 and negative current to lower it - enabling single-supply microcontrollers to detect direction and magnitude without external level-shifting. The same configuration applies to INA296B5IDDFR.

Can the INA296B5IDDFR be used in low-side current sensing configurations?

Yes, INA296B5IDDFR supports low-side sensing: connect IN+ to the load side of the shunt and IN− to system ground. Its −5V to 110V common-mode range fully covers ground-referenced measurements, and its 35µA input bias current minimizes error from shunt resistor parasitics. The REF1/REF2 pins are configured identically as in high-side use - e.g., REF1 = V_S, REF2 = GND - to maintain bidirectional output swing centered at V_S/2. This capability is explicitly validated for INA296B5IDDFR in TI's SBOSA04D datasheet.

What is the typical quiescent current consumption of the INA296B5IDDFR, and how does it vary with supply voltage?

INA296B5IDDFR draws 2.5mA typical quiescent current at 25°C, rising to 3.2mA maximum across −40°C to +125°C. Over the full 2.7V–20V supply range, IQ remains stable - varying by less than ±0.1mA - due to internal regulation. This consistency simplifies power budgeting in always-on monitoring circuits, such as battery fuel gauging or standby current supervision, where INA296B5IDDFR's low drift and predictable IQ directly impact system runtime accuracy.

Does the INA296B5IDDFR require external compensation components for stability?

No, INA296B5IDDFR is internally compensated and stable with capacitive loads up to 1nF, as confirmed in the Electrical Characteristics table. A minimum 1µF ceramic bypass capacitor between V_S and GND is required near the DDF package, but no external RC networks, isolation resistors, or compensation capacitors are needed - simplifying layout and eliminating tuning effort. This inherent stability is guaranteed for INA296B5IDDFR across all operating conditions, including full temperature and supply ranges.