Texas Instruments INA296B4IDGKR

Overview

INA296B4IDGKR 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, and ±150µV max input offset voltage - enabling accurate shunt-based current monitoring in DC/DC converters and battery management systems.

For engineers reviewing the INA296B4IDGKR datasheet, INA296B4IDGKR pinout, INA296B4IDGKR application, or INA296B4IDGKR equivalent, this page provides verified specifications, package mapping (VSSOP-8), functional pin definitions, real-world use cases in 48V rack servers and macro RRUs, and two validated alternative parts with documented technical and application differences.

Technical Context

The INA296B4IDGKR uses a zero-drift, high-CMRR (120–130dB) architecture to reject common-mode transients while maintaining ±0.1% gain error and ±5ppm/°C drift across −40°C to +125°C. Its 8V/µs slew rate and 1µs 1% settling time support fast overcurrent detection in transient-rich 48V PSU environments.

It features dual reference inputs (REF1/REF2) that configure unidirectional or bidirectional output centering without external components, and draws only 2.5mA quiescent current from a 2.7V–20V supply - independent of its −5V to 110V input common-mode range.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA296B4IDGKR, INA240A4IDR trades bandwidth and slew rate for lower cost and wider availability, while MAX40056AUB+T offers superior speed but requires external circuitry to replicate bidirectional centering - making INA296B4IDGKR optimal for compact, flexible 48V power monitoring where integrated reference control reduces BOM count and layout complexity.

Availability

INA296B4IDGKR is available at Aetrix Electronics and suitable for 48V DC/DC converters, 48V battery management systems (BMS), and macro remote radio unit (RRU) designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial and telecom deployments.

Supply support for INA296B4IDGKR 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 - addressing the need for wide common-mode range, low drift, and integrated reference flexibility in datacenter, telecom, and industrial power systems.

FAQ

What is the maximum common-mode voltage the INA296B4IDGKR can withstand during normal operation?

The INA296B4IDGKR 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 INA296B4IDGKR suitable for 48V systems with significant bus noise or fault conditions, including high-side sensing in buck converters where VIN may exceed VS.

How does the REF1 and REF2 pin configuration affect bidirectional current measurement in the INA296B4IDGKR?

In bidirectional mode, INA296B4IDGKR requires REF1 connected to VS and REF2 connected to GND (or vice versa) to set the output center at VS/2. This allows the OUT pin to swing symmetrically above and below mid-supply in response to forward and reverse current flow through the shunt resistor - enabling single-supply ADC interfacing without external level-shifting. The INA296B4IDGKR's internal matched resistor network ensures ≤0.015% reference divider error across temperature.

Can the INA296B4IDGKR be used in low-side current sensing configurations?

Yes, the INA296B4IDGKR 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 the 100V/V gain provides high-resolution output even with sub-milliohm shunts. For unidirectional low-side use, tie both REF1 and REF2 to GND to establish a ground-referenced output that rises with current flow.

What is the thermal performance of the INA296B4IDGKR in VSSOP-8 (DGK) package under continuous 125°C ambient operation?

In the DGK (VSSOP-8) package, the INA296B4IDGKR has a junction-to-ambient thermal resistance (RθJA) of 167.2°C/W. At 2.5mA quiescent current and no output loading, power dissipation is ~12.5mW - resulting in <2.1°C junction rise above ambient. Even under worst-case 10kΩ load and 20V supply, junction temperature remains well within the 150°C absolute maximum when mounted on standard 2-layer PCBs with moderate copper area.

Does the INA296B4IDGKR require external compensation capacitors for stability?

No, the INA296B4IDGKR is internally compensated and stable with capacitive loads up to 1nF - sufficient for direct connection to most SAR and delta-sigma ADC inputs without added RC filtering. Its 1.1MHz bandwidth and 8V/µs slew rate are preserved without external components, though a 100nF bypass capacitor between VS and GND close to the DGK package is mandatory for noise immunity and supply rejection.