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Texas Instruments INA296A2IDDFR
- Part No.:
- INA296A2IDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA296A2IDDFR.pdf
- Description:
- -5-V TO 110-V, BIDIRECTIONAL, 1.
- Quantity:
- Payment:
- Shipping:
Inventory:1,401
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Product details
Overview
INA296A2IDDFR from Texas Instruments is an ultra-precise, bidirectional current sense amplifier optimized for 48V systems, featuring 20V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, 8V/µs slew rate, and ±10µV max offset voltage (INA296A2 grade). It enables high-accuracy DC and transient current monitoring in high-voltage power conversion stages.
For engineers reviewing the INA296A2IDDFR datasheet, INA296A2IDDFR pinout, INA296A2IDDFR application, or INA296A2IDDFR equivalent, this device supports fast overcurrent detection (<1µs to 1% settling), precision shunt-based sensing in high-side/low-side configurations, and operation across −40°C to 125°C with minimal gain drift (±1 ppm/°C).
Technical Context
The INA296A2IDDFR uses a zero-drift, precision topology that maintains constant 35µA input bias current across its full −20V to 120V survival common-mode range - independent of supply voltage. Its multistage architecture delivers 1.1MHz bandwidth at all gains while preserving 166dB DC CMRR and ±0.01% max gain error.
Reference pins REF1 and REF2 allow configurable output centering: connecting REF1 to VS and REF2 to GND sets mid-supply output for bidirectional sensing; tying both to GND or VS enables unidirectional operation with ground- or supply-referenced output swing. The SOT-23-8 (DDF) package supports compact placement near high-current paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V - scales shunt voltage drop linearly for optimal dynamic range with 50mΩ–100mΩ shunts in 48V BMS or DC/DC converters. |
| Common-Mode Range | −5V to 110V - supports direct high-side sensing on 48V bus without level-shifting, even during negative transients or startup undershoot. |
| Bandwidth | 1.1MHz - captures fast load steps and overcurrent events (e.g., short-circuit detection) with <1µs 1% settling time. |
| Input Offset Voltage | ±10µV max - enables accurate measurement of sub-100mA currents using 10mΩ shunts while minimizing power loss. |
| Supply Range | 2.7V to 20V - operates from auxiliary 3.3V or 5V rails while monitoring up to 110V common-mode voltages. |
| CMRR | 166dB - rejects noise from switching nodes in 48V DC/DC converters, ensuring stable output under PWM edge coupling. |
| Quiescent Current | 2.5mA - low power consumption suitable for always-on monitoring in rack server PSUs and telecom RRU systems. |
Pinout & Package
SOT-23-8 (DDF) package: 2.9mm × 2.8mm footprint, thermally enhanced for high-density PCB layouts near power stages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Current-sense positive input | Connect to bus side of shunt in high-side sensing; load side in low-side sensing - handles −5V to 110V common-mode. |
| IN− | Current-sense negative input | Connect to load side of shunt in high-side; ground side in low-side - differential input defines VSENSE polarity and direction. |
| GND | Ground reference | System ground return for supply and reference circuitry; required for stable biasing and noise rejection. |
| NC | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure proper internal node biasing. |
| OUT | Analog output | Voltage output = 20 × (IN+ − IN−) + (REF1 + REF2)/2; rail-to-rail capable with 20mV headroom to GND and 200mV to VS. |
| VS | Power supply | 2.7V–20V single supply; powers internal amplifiers and reference network - independent of input common-mode voltage. |
| REF1 | Reference input 1 | Configures output center point; paired with REF2 to set bidirectional zero-current output (e.g., VS/2) or unidirectional clamp. |
| REF2 | Reference input 2 | Matches REF1 electrically; no functional difference - used together to define precise output offset via resistor divider or direct connection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing capability | Supports current flow in either direction via dual-reference configuration - essential for battery charge/discharge monitoring in 48V BMS. |
| Ultra-low offset drift | ±0.1µV/°C - ensures <±1µV total offset shift over −40°C to 125°C, critical for long-term accuracy in unattended rack servers. |
| Constant input bias current | 35µA typical, invariant across −20V to 120V common-mode - eliminates gain error from shunt leakage in high-impedance sensing paths. |
| High-speed transient response | 1µs to 1% settling - enables real-time overcurrent protection in macro RRU power stages without added digital delay. |
| Wide supply-independent common-mode range | Operates with VS = 3.3V while measuring 48V bus - eliminates need for isolated supplies or level translators in multi-rail systems. |
Applications
| 48V Battery Management System | 48V DC/DC Converter |
|---|---|
Use Scenario: Monitoring bidirectional current during charging and discharging of Li-ion stacks in telecom or datacenter UPS. IC Role / Device Role / Timing Role: High-side current sense amplifier providing analog output proportional to shunt voltage with 20V/V gain and mid-supply zero reference. Use Value: ±10µV offset enables <±5mA measurement accuracy on 50mΩ shunts, supporting state-of-charge estimation within 0.5% error over temperature. |
Use Scenario: Real-time phase current sensing in interleaved buck converters powering AI accelerators in 48V rack servers. IC Role / Device Role / Timing Role: Fast-settling current monitor feeding analog-to-digital converter inputs for digital control loop feedback. Use Value: 1.1MHz bandwidth and 1µs settling capture 100kHz switching harmonics and fault transients, improving loop stability and fault response time. |
| Macro Remote Radio Unit (RRU) | 48V Merchant Network Power Supply |
Use Scenario: Detecting rapid overcurrent events during antenna array reconfiguration or lightning-induced surges in outdoor base stations. IC Role / Device Role / Timing Role: High-bandwidth current sense front-end triggering hardware shutdown before FPGA or RF IC damage occurs. Use Value: 8V/µs slew rate and 1.1MHz bandwidth enable detection of 500ns current spikes - faster than microcontroller-based protection alone. |
Use Scenario: Precision load current reporting in OCP-compliant AC-DC PSUs for cloud networking switches with PMBus telemetry. IC Role / Device Role / Timing Role: Analog current sensor interfacing to ADC in digital power controller for real-time efficiency optimization and thermal derating. Use Value: ±0.01% gain error and 166dB CMRR maintain <0.1% full-scale accuracy despite noisy 48V distribution bus coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2IDR | 20V/V gain, −4V to 80V common-mode, 4V/µs slew rate, ±20µV offset (A-grade), SOIC-8 only | Limited to 80V max common-mode; lower bandwidth (400kHz) and slower settling (3µs) - insufficient for 110V transient immunity or fast OCP. | Select INA296A2IDDFR when monitoring >80V buses or requiring <1.5µs transient response; choose INA240A2IDR for cost-sensitive 48V-only designs with SOIC layout constraints. |
| MAX40056ATA+T | 20V/V gain, −0.1V to 65V common-mode, 1.5MHz bandwidth, ±150µV offset (B-grade), 8-WLP package | Lower common-mode range excludes high-side 48V monitoring during negative transients; higher offset degrades low-current accuracy. | Prefer INA296A2IDDFR for industrial-grade 48V BMS where −5V to 110V coverage and ±10µV offset are mandatory; use MAX40056ATA+T only in space-constrained consumer-grade 48V adapters. |
Compared with INA240A2IDR and MAX40056ATA+T, the INA296A2IDDFR uniquely combines 110V common-mode tolerance, ±10µV offset, and 1.1MHz bandwidth in a thermally robust SOT-23-8 package - making it the only option qualified for high-reliability 48V infrastructure monitoring where voltage transients and precision coexist.
Availability
INA296A2IDDFR 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 across extended temperature and high-voltage stress conditions.
Supply support for INA296A2IDDFR 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 solutions.
The INA296x product line was designed specifically for ultra-precise, high-bandwidth current sensing in next-generation 48V power architectures - targeting datacenter, telecom, and industrial systems demanding simultaneous wide common-mode range, low drift, and fast transient response.
FAQ
What is the maximum common-mode voltage the INA296A2IDDFR can withstand during operation?
The INA296A2IDDFR operates continuously over a common-mode input range of −5V to 110V. Its survival rating extends to −20V to 120V, allowing robust handling of transients such as load dump or cold cranking in 48V systems. This exceeds the operating range of most competing amplifiers and eliminates external clamping in many designs.
How does the INA296A2IDDFR achieve bidirectional current sensing?
The INA296A2IDDFR achieves bidirectional sensing by configuring its REF1 and REF2 pins to set the output's zero-current baseline - typically at VS/2. When current flows in one direction, OUT rises above VS/2; reverse current pulls OUT below VS/2. This analog bipolar output directly interfaces with ADCs or comparators without additional signal conditioning.
Can the INA296A2IDDFR be used in low-side current sensing configurations?
Yes, the INA296A2IDDFR 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 its 166dB CMRR rejects noise from nearby digital circuits - unlike many amplifiers limited to high-side use only.
What is the purpose of the NC pin on the INA296A2IDDFR DDF package?
The NC pin (Pin 4) on the INA296A2IDDFR is internally reserved and must be connected to GND per the datasheet. This connection stabilizes internal bias nodes and ensures specified performance - leaving it floating may degrade CMRR, offset, or thermal behavior. It is not a functional signal pin but a mandatory grounding point.
Does the INA296A2IDDFR require external compensation components for stability?
No, the INA296A2IDDFR is internally compensated and drives capacitive loads up to 1nF without oscillation. Its 1.1MHz bandwidth and 8V/µs slew rate are guaranteed with no external components - simplifying layout and eliminating tuning effort. Stability is maintained across all gains and supply voltages from 2.7V to 20V.
INA296A2IDDFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 8V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.1 MHz
- Current - Input Bias:
- 35 µA
- Voltage - Input Offset:
- 3 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:
- TSOT-23-8
INA296A2IDDFR FAQ
1.How can I place an order for INA296A2IDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA296A2IDDFR 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 INA296A2IDDFR reliable?
The price and inventory of INA296A2IDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA296A2IDDFR is usually 5 days.
3.What payment methods are accepted for INA296A2IDDFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA296A2IDDFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA296A2IDDFR?
INA296A2IDDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA296A2IDDFR 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 INA296A2IDDFR?
For technical support, including INA296A2IDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA296A2IDDFR requirements.
6.How does Aetrix verify that INA296A2IDDFR is sourced from the original manufacturer or authorized distributors?
All INA296A2IDDFR 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 INA296A2IDDFR meets industry standards.
7.What is the process for return or replacement of INA296A2IDDFR?
All INA296A2IDDFR units undergo pre-shipment inspection (PSI). If there is an issue with INA296A2IDDFR, 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 INA296A2IDDFR part is unused and in its original packaging.
Return procedure for INA296A2IDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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