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Texas Instruments INA296B3IDGKR
- Part No.:
- INA296B3IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA296B3IDGKR.pdf
- Description:
- -5-V TO 110-V, BIDIRECTIONAL, 1.
- Quantity:
- Payment:
- Shipping:
Inventory:2,415
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Product details
Overview
INA296B3IDGKR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for 48V systems, featuring 50V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, and ±150µV max input offset voltage. It enables high-accuracy shunt-based current monitoring in high-voltage DC/DC converters and battery management systems.
For engineers reviewing the INA296B3IDGKR datasheet, INA296B3IDGKR pinout, INA296B3IDGKR application, or INA296B3IDGKR equivalent, this page delivers verified specifications, package mapping (VSSOP-8), functional pin definitions, real-world use cases in 48V BMS and macro RRU, and two validated alternative parts with documented technical and application differences.
Technical Context
The INA296B3IDGKR uses a zero-drift, precision topology to maintain ±150µV max offset and ±0.1% max gain error across −40°C to +125°C, with CMRR of 120–130dB (typ. 130dB) over its full common-mode range. Its 8V/µs slew rate and 1µs 1% settling time support fast overcurrent detection in transient-sensitive power stages.
It operates from 2.7V to 20V supply, draws 2.5mA quiescent current, and supports configurable unidirectional or bidirectional output via dual reference pins (REF1/REF2), enabling mid-supply output offset for bidirectional sensing without external level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V - sets output scaling for 20mV shunt drop → 1V output; optimizes dynamic range for mid-current 48V applications. |
| Common-mode range | −5V to 110V - supports high-side, low-side, and inline sensing in 48V bus systems exceeding supply rail (e.g., VS = 5V). |
| Bandwidth | 1.1MHz - enables accurate capture of fast current transients (e.g., MOSFET switching edges) in DC/DC converters. |
| Input offset voltage | ±150µV max - ensures ≤3mA error at 60mΩ shunt; critical for low-current accuracy in BMS cell balancing. |
| Slew rate | 8V/µs - sustains linear response during 1A/µs current steps; prevents distortion in overcurrent protection circuits. |
| Supply voltage | 2.7V to 20V - allows direct interface with 3.3V/5V/12V control logic while sensing up to 110V bus voltages. |
| Operating temperature | −40°C to +125°C - qualified for under-hood automotive, telecom RRU, and industrial server environments. |
Pinout & Package
VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected). RoHS-compliant, moisture sensitivity level 2a.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Negative current-sense input | Connects to load side (high-side) or ground side (low-side) of shunt; differential input with IN+ defines VSENSE. |
| GND (Pin 2) | Ground reference | Primary return path for supply and signal; connects to system ground plane for noise immunity. |
| REF2 (Pin 3) | Reference voltage input | One of two matched inputs setting output mid-point; tied to GND or VS for unidirectional operation. |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure stability and EMI performance. |
| OUT (Pin 5) | Analog output | Single-ended voltage output scaled by 50×VSENSE plus (REF1+REF2)/2; drives ADC inputs or comparator thresholds. |
| VS (Pin 6) | Positive supply | Accepts 2.7V–20V; powers internal circuitry; output swing limited to VS − 0.2V min and GND + 20mV min. |
| REF1 (Pin 7) | Reference voltage input | Matched to REF2; together they define output offset; no functional difference between REF1 and REF2. |
| IN+ (Pin 8) | Positive current-sense input | Connects to bus-voltage side (high-side) or load side (low-side); forms differential pair with IN−. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing capability | Configurable via REF1/REF2 biasing - enables single-device measurement of charge/discharge current in 48V BMS without polarity reversal. |
| Ultra-stable gain accuracy | ±0.1% max gain error with ±5ppm/°C drift - eliminates recalibration needs across temperature in rack-server PSU monitoring. |
| High-speed transient response | 1µs settling to 1% - supports cycle-by-cycle overcurrent shutdown in 500kHz+ DC/DC controllers. |
| Low-input-bias-current architecture | 35µA typical per input, constant over −20V to +120V common-mode - minimizes error in high-impedance shunt networks. |
| Wide supply-independent common-mode range | Operates with VCM = −5V to 110V regardless of VS = 2.7V–20V - enables direct high-side sensing on 48V/54V rails using 3.3V microcontrollers. |
Applications
| 48V Battery Management System | Macro Remote Radio Unit (RRU) |
|---|---|
|
Use Scenario: Real-time bidirectional current monitoring of 48V Li-ion battery packs during charge/discharge cycles in telecom base stations. IC Role / Device Role / Timing Role: Current-sense amplifier measuring mV-level shunt voltage with 50V/V gain; outputs analog signal to isolated ADC for SoC estimation. Use Value: ±150µV offset enables ≤1.5A measurement error at 60mΩ shunt, supporting precise Coulomb counting over full −40°C to +85°C operating range. |
Use Scenario: High-speed current monitoring of PA bias rails in 5G macro RRUs to detect fault conditions before thermal damage occurs. IC Role / Device Role / Timing Role: Fast-response current sensor feeding comparator input for <1µs overcurrent trip; interfaces with FPGA-based protection logic. Use Value: 1.1MHz bandwidth and 1µs 1% settling allow detection of 100ns current spikes from RF PA failure modes, improving system reliability. |
| 48V Rack Server PSU | 48V DC/DC Converter |
|
Use Scenario: Input/output current sensing in multi-phase 48V-to-12V/5V/3.3V intermediate bus converters inside data center servers. IC Role / Device Role / Timing Role: Precision shunt amplifier providing feedback to digital PWM controller for phase current balancing and efficiency optimization. Use Value: ±0.1% gain error ensures consistent current reporting across all phases, reducing thermal imbalance and improving converter lifetime. |
Use Scenario: High-side current sensing in synchronous buck converters powering ASICs/FPGAs in AI accelerators. IC Role / Device Role / Timing Role: Bidirectional amplifier with REF1=VS and REF2=GND, delivering rail-to-rail compatible output to 16-bit SAR ADC. Use Value: 8V/µs slew rate preserves fidelity of 500kHz switching current waveforms, enabling accurate RMS current calculation for thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A3IDR | 50V/V gain, ±120µV max offset, 4V/µs slew rate, SOIC-8 only; lower bandwidth (400kHz). | Optimized for cost-sensitive industrial motor drives; lacks 1.1MHz bandwidth needed for fast transient detection. | Select when 400kHz bandwidth suffices and SOIC-8 footprint is preferred over VSSOP-8. |
| MAX40056ASA+ | 50V/V gain, ±100µV max offset, 1.5MHz bandwidth, 10V/µs slew rate; requires external reference for bidirectional mode. | Targeted at high-precision test equipment; higher quiescent current (4.5mA) limits use in thermally constrained RRUs. | Select when maximum speed (1.5MHz) and lowest offset (±100µV) justify added external component count and power budget. |
Compared with INA296B3IDGKR, INA240A3IDR trades bandwidth and slew rate for lower cost and wider availability, while MAX40056ASA+ delivers superior speed and offset but increases design complexity and power consumption - making INA296B3IDGKR optimal for balanced 48V BMS and RRU deployments requiring integrated bidirectional reference handling.
Availability
INA296B3IDGKR is available at Aetrix Electronics and suitable for 48V battery management systems, macro remote radio units, and 48V rack server power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for INA296B3IDGKR 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 sensing solutions.
The INA296x product line was designed specifically for high-accuracy, high-speed current measurement in next-generation 48V power architectures - including telecom infrastructure, data center PSUs, and electric vehicle auxiliary systems.
FAQ
What is the maximum common-mode voltage the INA296B3IDGKR can withstand?
The INA296B3IDGKR supports an operational common-mode input range of −5V to 110V and a survival rating of −20V to 120V. This allows direct high-side sensing on 48V, 54V, and even 110V intermediate bus rails without external level-shifting circuitry. The device maintains specified performance across this full range when powered from 2.7V to 20V, independent of VS.
How does the INA296B3IDGKR achieve bidirectional current sensing?
The INA296B3IDGKR 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 - enabling positive current to raise OUT above mid-supply and negative current to lower it below. This eliminates need for external op-amps or level shifters, simplifying PCB layout and improving accuracy in 48V BMS applications.
What is the purpose of the NC pin (Pin 4) on the INA296B3IDGKR?
Pin 4 on the INA296B3IDGKR is designated NC (No Connect) but must be externally connected to GND per the datasheet. This connection stabilizes internal biasing, reduces EMI susceptibility, and ensures consistent CMRR performance across temperature and common-mode voltage. Leaving Pin 4 floating may degrade offset drift and increase noise in high-precision 48V applications.
Can the INA296B3IDGKR be used with a 3.3V supply in a 48V system?
Yes - the INA296B3IDGKR operates from 2.7V to 20V supply and functions correctly with VS = 3.3V while sensing common-mode voltages up to 110V. Its output swings from GND + 20mV to VS − 0.2V, so with 3.3V supply, usable output range is ~20mV to 3.1V. This is fully compatible with 12-bit+ ADCs in microcontrollers commonly used in 48V BMS and RRU designs.
What is the typical input bias current of the INA296B3IDGKR, and why does it matter?
The INA296B3IDGKR has a typical input bias current of 35µA per input (IN+ and IN−), and critically, this value remains constant across its full −20V to +120V common-mode range. Unlike many high-voltage amplifiers, its bias current does not scale with VCM - ensuring predictable shunt resistor error and enabling accurate low-current measurements in high-impedance 48V telecom power systems.
INA296B3IDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Single-Ended
- Slew Rate:
- 8V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.1 MHz
- Current - Input Bias:
- 35 µA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 2.5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 20 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
INA296B3IDGKR FAQ
1.How can I place an order for INA296B3IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA296B3IDGKR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for INA296B3IDGKR reliable?
The price and inventory of INA296B3IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA296B3IDGKR is usually 5 days.
3.What payment methods are accepted for INA296B3IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA296B3IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA296B3IDGKR?
INA296B3IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA296B3IDGKR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for INA296B3IDGKR?
For technical support, including INA296B3IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA296B3IDGKR requirements.
6.How does Aetrix verify that INA296B3IDGKR is sourced from the original manufacturer or authorized distributors?
All INA296B3IDGKR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that INA296B3IDGKR meets industry standards.
7.What is the process for return or replacement of INA296B3IDGKR?
All INA296B3IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA296B3IDGKR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The INA296B3IDGKR part is unused and in its original packaging.
Return procedure for INA296B3IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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