Texas Instruments INA296B2IDGKR

Overview

INA296B2IDGKR 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 20V/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.

For engineers reviewing the INA296B2IDGKR datasheet, INA296B2IDGKR pinout, INA296B2IDGKR application, or INA296B2IDGKR equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-chain support tailored for 48V BMS, DC/DC converters, and telecom power designs.

Technical Context

The INA296B2IDGKR uses a zero-drift, precision topology with matched internal resistors to achieve ±0.1% max gain error and ±5ppm/°C drift across −40°C to +125°C. Its input bias current remains constant at 35µA (typ) up to 110V common-mode voltage - independent of V_CM - unlike conventional high-voltage amplifiers.

It supports configurable unidirectional or bidirectional output via dual reference pins (REF1/REF2), allowing mid-supply output (e.g., 2.5V @ 5V VS) for symmetric current sensing or rail-referenced outputs for single-direction detection. Output settles to 1% in 1µs with no sustained oscillation up to 1nF capacitive load.

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 INA240A2IDR and MAX40056ATA+T, the INA296B2IDGKR uniquely combines VSSOP-8 packaging, dual-reference-pin bidirectional output, 1.1MHz bandwidth, and guaranteed 130dB CMRR - making it the only option supporting high-accuracy, high-speed, thermally robust, and layout-flexible current sensing in 48V infrastructure power systems.

Availability

INA296B2IDGKR 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 INA296B2IDGKR 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 and high-reliability power solutions.

The INA296x product line was designed specifically for high-voltage, high-accuracy current sensing in next-generation 48V power architectures - emphasizing speed, drift stability, and common-mode resilience in automotive, telecom, and datacenter applications.

FAQ

What is the maximum common-mode voltage the INA296B2IDGKR can withstand during normal operation?

The INA296B2IDGKR operates continuously over a common-mode input range of −5V to 110V. This allows direct connection to 48V, 54V, or even 60V intermediate bus rails without attenuation or isolation. The device also survives transient conditions up to −20V and 120V, providing margin against load-dump or inductive kick events in industrial and telecom systems. This rating applies across the full −40°C to +125°C temperature range.

Can the INA296B2IDGKR be used for bidirectional current sensing, and how is it configured?

Yes, the INA296B2IDGKR supports true bidirectional current sensing. Configuration requires applying complementary reference voltages to REF1 and REF2 - typically VS to one pin and GND to the other - which sets the output quiescent point at mid-supply (e.g., 2.5V with 5V VS). Current flow in either direction then produces proportional positive or negative output deviation from that midpoint. This eliminates need for external level-shifting circuitry or dual-supply operation.

What is the typical input bias current of the INA296B2IDGKR, and why does it matter for shunt selection?

The INA296B2IDGKR draws a typical input bias current of 35µA per input (IN+, IN−), and this value remains constant across its entire −20V to 120V survival common-mode range. Unlike many high-voltage amplifiers, its bias current does not scale with V_CM. This stability prevents gain error drift when using low-value shunts (e.g., 1–5mΩ) in high-current applications, ensuring consistent accuracy regardless of bus voltage - critical for precision energy metering and closed-loop current control.

How does the 1.1MHz bandwidth of the INA296B2IDGKR improve overcurrent protection in DC/DC converters?

The 1.1MHz small-signal bandwidth of the INA296B2IDGKR enables detection of fast-rising fault currents - such as those caused by shorted MOSFETs or output capacitors - within sub-microsecond timescales. With 1µs settling to 1%, the INA296B2IDGKR delivers timely, accurate current data to digital controllers, allowing cycle-by-cycle shutdown before destructive energy dissipation occurs. This performance exceeds legacy amplifiers limited to ≤400kHz bandwidth and >3µs settling.

Is the INA296B2IDGKR pin-compatible with other members of the INA296x family, such as the INA296A2IDGKR?

Yes, the INA296B2IDGKR is fully pin-compatible with all other INA296x variants in the same VSSOP-8 (DGK) package, including INA296A2IDGKR. The only functional differences lie in precision specifications: INA296B2IDGKR offers ±0.1% max gain error and ±150µV max offset, while INA296A2IDGKR provides ±0.01% and ±10µV. Both share identical pinout, supply requirements, bandwidth, slew rate, and reference configuration - enabling drop-in replacement where higher accuracy is not required.