Texas Instruments INA296B5IDR

Overview

INA296B5IDR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for 48V high-voltage DC/DC converters and battery management systems. It operates over −5V to 110V common-mode range, delivers 200V/V fixed gain, 1.1MHz bandwidth, 8V/µs slew rate, and ±150µV max input offset voltage (±0.5µV/°C drift) across −40°C to 125°C.

For engineers reviewing the INA296B5IDR datasheet, INA296B5IDR pinout, INA296B5IDR application, or INA296B5IDR equivalent, this page provides verified specifications, SOT23-8 package details, bidirectional sensing configuration guidance, and validated alternatives for high-speed overcurrent protection in 48V server and telecom power systems.

Technical Context

The INA296B5IDR uses a zero-drift, high-common-mode architecture enabling precise bidirectional current measurement independent of supply voltage (2.7V–20V). Its input bias current remains constant at 35µA (typ) across −20V to 120V survival range, eliminating CMV-dependent leakage errors in high-side shunt monitoring.

It supports configurable unidirectional or bidirectional output via dual reference pins (REF1/REF2), allowing mid-supply output (e.g., V_S/2) for symmetric current detection or rail-referenced output for single-direction sensing - all with 1% settling in 1µs and 166dB CMRR (INA296A) / 130dB (INA296B).

Key Specifications

Pinout & Package

INA296B5IDR is packaged in an 8-pin SOT-23 (DDF) measuring 2.9mm × 2.8mm, optimized for space-constrained 48V power modules and PCBs with tight thermal constraints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional current sensing applications.

Compared with INA240A5IDR and MAX40056ASA+T, INA296B5IDR uniquely combines 110V upper common-mode limit, 1.1MHz bandwidth, and rail-to-rail compatible output swing - making it the only option qualified for 48V telecom and industrial systems requiring simultaneous high voltage tolerance and microsecond fault response.

Availability

INA296B5IDR is available at Aetrix Electronics and suitable for 48V DC/DC converters, 48V battery management systems (BMS), and macro remote radio unit (RRU) power monitoring requiring stable component supply and long-term industrial lifecycle support.

Supply support for INA296B5IDR 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 bidirectional current sensing in next-generation 48V power architectures - targeting datacenter, telecom, and industrial applications demanding wide common-mode range and µs-level transient response.

FAQ

What is the maximum common-mode voltage the INA296B5IDR can withstand during operation?

The INA296B5IDR operates continuously over a common-mode input range of −5V to 110V. Its survival rating extends to −20V to 120V, meaning it tolerates short-duration transients beyond operational limits without damage. This makes INA296B5IDR suitable for 48V systems experiencing load dump or inductive kickback, where bus voltage may spike above 65V. The device maintains specified performance throughout its −5V to 110V operating window.

How does the INA296B5IDR achieve bidirectional current sensing?

The INA296B5IDR achieves bidirectional sensing through its dual reference inputs (REF1 and REF2). When REF1 is tied to V_S and REF2 to GND, the output centers at V_S/2. A positive differential input (IN+ > IN−) drives OUT above V_S/2; a negative differential input drives OUT below V_S/2. This symmetric output swing around mid-supply enables detection of current direction and magnitude using a single-ended ADC - a core capability of the INA296B5IDR in BMS and regenerative converter applications.

What is the typical quiescent current consumption of the INA296B5IDR?

The INA296B5IDR draws 2.5mA typical quiescent current at 25°C with V_S = 5V and V_SENSE = 0mV. Over the full temperature range (−40°C to 125°C), quiescent current increases to a maximum of 3.2mA. This low and stable supply current enables integration into always-on monitoring circuits in 48V BMS and telecom equipment without significant impact on standby power budgets - a key design advantage of the INA296B5IDR over higher-I_Q alternatives.

Can the INA296B5IDR be used in low-side current sensing configurations?

Yes, the INA296B5IDR supports low-side, high-side, and inline current sensing topologies. In low-side configuration, IN− connects to system ground and IN+ connects to the load side of the shunt. The device's −5V to 110V common-mode range fully covers ground-referenced measurements, and its 130dB CMRR rejects noise from nearby switching nodes. This flexibility allows the same INA296B5IDR part number to be deployed across multiple board designs - reducing inventory complexity while maintaining precision in low-side motor drive or LED driver applications.

What package options are available for the INA296B5IDR, and which one is shipped?

The INA296B5IDR is orderable exclusively in the 8-pin SOT-23 (DDF) package, measuring 2.9mm × 2.8mm. While the INA296x family also offers VSSOP-8 and SOIC-8 variants, the "IDR" suffix specifically denotes the SOT-23-8 variant. This compact package delivers optimal thermal resistance (R_θJA = 129.7°C/W) for surface-mount power applications and is compatible with standard reflow profiles - ensuring reliable assembly in high-volume 48V PSU manufacturing where the INA296B5IDR is commonly deployed.