Texas Instruments INA296A3IDGKR

Overview

INA296A3IDGKR from Texas Instruments is an ultra-precise, bidirectional current sense amplifier optimized for 48V systems, featuring 50V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, and ±10µV max offset voltage. It enables high-accuracy DC and transient current monitoring in high-voltage power conversion stages.

For engineers reviewing the INA296A3IDGKR datasheet, INA296A3IDGKR pinout, INA296A3IDGKR application, or INA296A3IDGKR equivalent, this page delivers verified specifications, package mapping, functional pin roles, real-world use cases in 48V BMS and DC/DC converters, and validated alternative options for design flexibility.

Technical Context

The INA296A3IDGKR employs a zero-drift, precision topology with dual reference inputs (REF1/REF2) enabling configurable unidirectional or bidirectional output centering - e.g., mid-supply for bidirectional sensing or rail-referenced for unidirectional. Its input stage operates independently of supply voltage, supporting common-mode voltages beyond VS (up to 110V).

It achieves 166dB CMRR and ±0.01% max gain error with ±1ppm/°C drift across −40°C to +125°C, while delivering 8V/µs slew rate and 1µs settling to 1%, making it suitable for fast overcurrent detection in 48V server PSUs and macro RRU protection circuits.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected), RoHS-compliant, moisture sensitivity level 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3IDR and MAX40056ATA+, the INA296A3IDGKR uniquely combines 110V survival rating, 1.1MHz bandwidth, and ±10µV offset in VSSOP-8 - making it the only option qualified for high-reliability 48V telecom and server applications demanding simultaneous precision, speed, and robustness.

Availability

INA296A3IDGKR is available at Aetrix Electronics and suitable for 48V battery management systems, 48V DC/DC converter protection, and macro remote radio unit (RRU) current monitoring requiring stable component supply across extended temperature and high-voltage stress conditions.

Supply support for INA296A3IDGKR 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 amplifiers and power management ICs.

The INA296x product line was designed specifically for high-accuracy, high-bandwidth current sensing in next-generation 48V power architectures - including datacenter PSUs, electric vehicle subsystems, and 5G infrastructure - where traditional amplifiers fail due to common-mode limitations or drift.

FAQ

What is the maximum common-mode voltage the INA296A3IDGKR can withstand continuously?

The INA296A3IDGKR supports continuous operation from −5V to 110V common-mode input voltage. Its survival rating extends to −20V to 120V, meaning it withstands short-duration transients within that range without damage. This enables direct connection to 48V buses with headroom for load-dump spikes, unlike amplifiers limited to VS-referenced ranges. The INA296A3IDGKR's architecture decouples input stage biasing from supply rails, allowing true wide-range sensing independent of the 2.7V–20V VS supply.

How does the INA296A3IDGKR achieve bidirectional current sensing?

The INA296A3IDGKR 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 VSENSE drives OUT above VS/2 (indicating one current direction), and negative VSENSE drives OUT below VS/2 (indicating reverse flow). This eliminates need for external level-shifting or dual-supply circuitry. The INA296A3IDGKR's precision internal resistor network ensures reference divider accuracy better than ±0.01%, maintaining direction resolution even at microampere-level currents.

What shunt resistor value is recommended for use with the INA296A3IDGKR in a 48V BMS?

For a 48V BMS measuring ±200A with 12-bit ADC resolution, a 0.5mΩ shunt is recommended with the INA296A3IDGKR. At 200A, VSENSE = 100mV; multiplied by 50V/V gain yields 5V output - matching standard ADC full-scale. The ±10µV offset contributes only ±0.2A error (10µV ÷ 50V/V ÷ 0.5mΩ), well within 0.1% system accuracy targets. Lower values (e.g., 0.25mΩ) improve power efficiency but require higher ADC gain; the INA296A3IDGKR's 39nV/√Hz input noise ensures SNR remains >70dB even at 10mV VSENSE.

Does the INA296A3IDGKR require external compensation components?

No, the INA296A3IDGKR is internally compensated and requires no external capacitors or resistors for stability. It drives capacitive loads up to 1nF directly, supporting standard 100nF bypass capacitors on VS and 10nF on REF pins without oscillation. Layout best practices include placing 100nF ceramic capacitor between VS and GND within 2mm of pins 6 and 2, and routing IN+/IN− traces as matched-length differential pairs. The INA296A3IDGKR's VSSOP-8 package includes an exposed thermal pad that must be soldered to PCB copper for optimal thermal performance - though it is not electrically connected.

How does temperature affect the gain accuracy of the INA296A3IDGKR?

The INA296A3IDGKR exhibits ±0.01% maximum gain error at 25°C, with drift limited to ±1ppm/°C over −40°C to +125°C - resulting in ≤±0.085% total gain error across full temperature range. This is achieved via on-chip trimming and zero-drift architecture that auto-corrects input-stage mismatches. In contrast, non-zero-drift amplifiers like the INA282 show >±100ppm/°C drift. For a 48V server PSU requiring ±0.2% total current measurement accuracy, the INA296A3IDGKR's gain stability dominates over offset drift, making it preferable for high-precision closed-loop control loops where gain error directly impacts regulation fidelity.