Texas Instruments INA296A4IDDFR

Overview

INA296A4IDDFR from Texas Instruments is an ultra-precise, bidirectional current sense amplifier optimized for 48V systems, featuring 100V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, 8V/µs slew rate, and ±10µV max input offset voltage. It enables high-accuracy DC and transient current monitoring in high-voltage power conversion stages.

For engineers reviewing the INA296A4IDDFR datasheet, INA296A4IDDFR pinout, INA296A4IDDFR application, or INA296A4IDDFR equivalent, this page delivers verified specifications, SOT-23-8 package details, real-world use cases in 48V BMS and DC/DC converters, and validated alternative options with technical differentiation.

Technical Context

The INA296A4IDDFR implements a zero-drift, precision current-sense architecture that maintains ±10µV max offset and ±0.015% max gain error across −40°C to +125°C, enabling stable measurement of low shunt voltages (e.g., ≤10mV) in high-common-mode environments. Its 1.1MHz bandwidth and 1µs 1% settling time support fast overcurrent detection in switching power supplies.

It operates from a single 2.7V–20V supply, draws 2.5mA quiescent current, and uses dual reference pins (REF1/REF2) to configure unidirectional or bidirectional output centering - allowing flexible integration into ground-referenced, supply-referenced, or mid-supply referenced signal chains without external level-shifting.

Key Specifications

Pinout & Package

INA296A4IDDFR is housed in an 8-pin SOT-23 package (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 current sense amplifier applications.

Compared with INA296A4IDDFR, INA240A4IDR offers lower cost but sacrifices 30V common-mode headroom and 2.75× slower slew rate, limiting protection loop speed; MAX40056ASA+T matches bandwidth but trades 45V common-mode margin and higher input noise, reducing accuracy in high-noise 48V PSU environments.

Availability

INA296A4IDDFR is available at Aetrix Electronics and suitable for 48V battery management systems, 48V DC/DC converters, and macro remote radio unit (RRU) power monitoring requiring stable component supply, long-term production continuity, and guaranteed traceable sourcing.

Supply support for INA296A4IDDFR 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The INA296x product line was designed specifically for ultra-precise, high-bandwidth current sensing in next-generation 48V power architectures - emphasizing low offset, wide common-mode operation, and robust performance across extended temperature ranges.

FAQ

What is the maximum common-mode voltage the INA296A4IDDFR can withstand during normal operation?

The INA296A4IDDFR supports a continuous operational common-mode input range of −5V to 110V. This allows direct connection to 48V buses with transient overvoltage margins, including negative rail excursions in regenerative systems. The device survives up to −20V to 120V in non-operational conditions, but sustained operation outside −5V–110V may impact accuracy or reliability. INA296A4IDDFR's architecture decouples common-mode handling from supply voltage, enabling operation even when VCM exceeds VS.

How does the INA296A4IDDFR achieve bidirectional current sensing without external components?

The INA296A4IDDFR achieves true bidirectional sensing by leveraging 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, and negative VSENSE drives it below. This eliminates need for external op-amps or level-shifters. INA296A4IDDFR's internal precision divider ensures <0.01% reference divider error, maintaining symmetry across full temperature range.

What is the minimum shunt resistor value usable with INA296A4IDDFR for ±1A measurement accuracy?

With ±10µV max input offset and 100V/V gain, INA296A4IDDFR resolves ±0.1mV output error. For ±1A full-scale measurement, a 100µΩ shunt yields ±100µV VSENSE - well above offset-induced error floor. At this value, power loss is just 100µW at 1A, enabling high-efficiency designs. Lower shunts (e.g., 50µΩ) remain viable if system noise and PCB layout control mitigate signal integrity degradation - INA296A4IDDFR's 166dB CMRR helps preserve SNR.

Does the INA296A4IDDFR require external compensation capacitors for stability?

No, the INA296A4IDDFR is internally compensated and stable with capacitive loads up to 1nF, per datasheet specifications. A 100nF bypass capacitor on VS is recommended for noise suppression, but no external compensation network is needed for unity-gain stability. Layout best practices - short traces to IN+/IN−, ground plane under DDF package, and separation from switching nodes - ensure optimal performance without added components. INA296A4IDDFR's SOT-23-8 footprint simplifies decoupling implementation.

Can the INA296A4IDDFR operate from a 3.3V supply while monitoring a 48V bus?

Yes, INA296A4IDDFR operates from 2.7V to 20V supply while measuring common-mode voltages from −5V to 110V - fully independent of VS. With 3.3V supply, its output swings from ≥20mV above GND to ≤2.9V (VS − 0.4V typical), sufficient for most 3.3V ADCs. The 100V/V gain means 10mV shunt drop produces 1V output - ideal for 12-bit systems. INA296A4IDDFR's architecture ensures accuracy is maintained regardless of supply voltage, as long as VS stays within spec.