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Texas Instruments INA296A4IDR
- Part No.:
- INA296A4IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA296A4IDR.pdf
- Description:
- -5-V TO 110-V, BIDIRECTIONAL, 1.
- Quantity:
- Payment:
- Shipping:
Inventory:1,919
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Product details
Overview
INA296A4IDR from Texas Instruments is an ultra-precise, bidirectional current sense amplifier optimized for high-voltage DC/DC converters and 48V battery management systems. It operates over −5V to 110V common-mode range, delivers 100V/V fixed gain, achieves ±0.015% max gain error and ±10µV max input offset voltage, and supports 1.1MHz bandwidth with 8V/µs slew rate for fast overcurrent detection.
For engineers reviewing the INA296A4IDR datasheet, INA296A4IDR pinout, INA296A4IDR application, or INA296A4IDR equivalent, this page provides verified technical context, package-specific pin functions, real-world use cases in 48V power systems, and validated alternative options for precision current sensing at high common-mode voltages.
Technical Context
The INA296A4IDR implements a zero-drift, high-side/low-side/bidirectional current-sense architecture with input-referred CMRR of 150–166dB and independent operation across −5V to 110V common-mode voltage - exceeding its 2.7V–20V supply range. Its 100V/V gain version maintains 1.1MHz small-signal bandwidth and 1µs 1% settling time for transient response in fast protection circuits.
It uses dual reference inputs (REF1/REF2) to configure unidirectional or bidirectional output centering, enabling mid-supply output (e.g., 2.5V at 5V VS) or rail-referenced operation. Input bias current remains stable at 35µA (typ) across full common-mode range, eliminating VCM-dependent leakage errors in precision shunt measurements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100V/V - scales 10mV shunt drop to 1V output, enabling high-resolution low-current measurement with minimal power loss. |
| Common-Mode Range | −5V to 110V - supports direct sensing on 48V bus, negative-rail systems, and high-side configurations beyond supply rails. |
| Gain Error | ±0.015% max - ensures <±1.5mV error at 10V output, critical for closed-loop current regulation accuracy. |
| Input Offset Voltage | ±10µV max - enables accurate sensing down to ~100µA through 0.1Ω shunt at room temperature. |
| Bandwidth | 1.1MHz - captures fast transients (e.g., MOSFET switching edges) without phase lag in protection algorithms. |
| Slew Rate | 8V/µs - sustains full-scale output swing within 125ns for 1V step, supporting sub-microsecond fault response. |
| Supply Range | 2.7V to 20V - compatible with 3.3V, 5V, and 12V control rails while maintaining full common-mode performance. |
Pinout & Package
INA296A4IDR is packaged in SOIC-8 (D package), 4.9mm × 6mm body with standard 1.27mm pitch. Pin functions are identical across D, DDF (SOT-23-8), and DGK (VSSOP-8) variants per TI SBOSA04D.
| 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 polarity. |
| GND (Pin 2) | Ground reference | System ground return for internal circuitry and output stage; must be low-impedance path for accuracy. |
| REF2 (Pin 3) | Reference voltage input | One half of internal divider; paired with REF1 to set output center voltage (e.g., 0V or VS for unidirectional, VS/2 for bidirectional). |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure stability and EMI immunity. |
| OUT (Pin 5) | Analog output | Voltage output = 100 × (IN+ − IN−) + (REF1 + REF2)/2; rail-to-rail capable with 20mV headroom to GND and 200mV to VS. |
| VS (Pin 6) | Positive supply | 2.7V–20V analog supply; powers internal amplifiers and reference network; decoupling capacitor required at pin. |
| REF1 (Pin 7) | Reference voltage input | Second half of internal divider; functionally identical to REF2; both pins define output offset baseline. |
| IN+ (Pin 8) | Positive current-sense input | Connects to bus-voltage side (high-side) or load side (low-side) of shunt; forms differential pair with IN−. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing capability | Configurable via REF1/REF2 to detect current flow in either direction - essential for regenerative braking or charge/discharge monitoring in BMS. |
| 166dB CMRR (typ) | Rejects >99.9999% of common-mode noise at 48V bus, preserving µV-level signal integrity in noisy power-conversion environments. |
| Zero-drift topology | Maintains ±10µV offset and ±0.1µV/°C drift over −40°C to +125°C - eliminates calibration drift in industrial and automotive thermal cycles. |
| Stable 35µA input bias current | Independent of common-mode voltage up to 110V - prevents gain error shift when sensing across wide VCM ranges in telecom or server PSUs. |
| 1.1MHz bandwidth at 100V/V | Enables real-time current waveform capture (e.g., PWM ripple, inrush peaks) without attenuation - critical for dynamic load analysis and adaptive control. |
Applications
| 48V DC/DC Converter | 48V Battery Management System |
|---|---|
Use Scenario: Real-time input/output current monitoring in isolated 48V–12V buck-boost converters for datacenter rack power distribution. IC Role / Device Role / Timing Role: High-side current sense amplifier measuring shunt voltage with 100V/V gain, referenced to mid-supply for bidirectional flow detection during load transients. Use Value: Enables precise power budgeting and fault logging with ±0.015% gain accuracy, directly supporting ASHRAE-compliant energy reporting and OCP response under 1µs. | Use Scenario: Cell-string current monitoring in 48V Li-ion battery packs for electric material handling equipment. IC Role / Device Role / Timing Role: Bidirectional shunt amplifier interfacing with MCU ADC, using REF1=GND and REF2=VS to generate 0–5V output proportional to charge/discharge current. Use Value: Delivers ±10µV offset stability across −40°C to +85°C operating range, ensuring SOC estimation accuracy remains within ±0.5% despite thermal cycling. |
| Macro Remote Radio Unit (RRU) | 48V Merchant Network Power Supply |
Use Scenario: PA bias current sensing in 5G macro base station RRUs where RF noise immunity and fast transient response are mandatory. IC Role / Device Role / Timing Role: Low-side current monitor placed between PA drain and ground, leveraging 1.1MHz bandwidth to track envelope-following current pulses without phase distortion. Use Value: 8V/µs slew rate ensures <125ns full-scale output rise, enabling real-time PA efficiency optimization and thermal derating control loops. | Use Scenario: Input current supervision in OCP-capable 48V merchant PSUs used in white-box switches and routers. IC Role / Device Role / Timing Role: High-side sense amplifier with −5V to 110V common-mode tolerance, placed upstream of primary FETs to detect short-circuit events before bus collapse. Use Value: 1µs 1% settling time allows detection of <500ns fault pulses, meeting IEC 62368-1 Class II safety response requirements for secondary-side isolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A4DR | 100V/V gain, −4V to 80V common-mode, ±12µV offset, 4V/µs slew rate, 350kHz bandwidth | Limited to ≤80V systems; lower bandwidth unsuitable for fast transient detection in 48V DC/DC converters | Select when cost sensitivity outweighs need for >80V operation or sub-µs response; not suitable for 110V survival margin or 1.1MHz signal fidelity. |
| LT6106IMS8#TRPBF | 100V/V gain, −5V to 60V common-mode, ±150µV offset, 0.45V/µs slew rate, 120kHz bandwidth | Higher offset and slower response; lacks bidirectional reference flexibility and 110V survival rating | Acceptable only for non-critical, low-speed 48V monitoring where ±150µV offset is tolerable and 120kHz bandwidth suffices. |
Compared with INA296A4IDR, INA240A4DR offers lower cost but sacrifices 30V common-mode headroom and 3× bandwidth; LT6106IMS8 trades precision and speed for wider availability, making it viable only in legacy designs where 1.1MHz response and ±10µV offset are not required.
Availability
INA296A4IDR is available at Aetrix Electronics and suitable for 48V DC/DC converters, 48V battery management systems, and macro remote radio units requiring stable component supply, long-term lifecycle support, and guaranteed traceability for industrial and telecom deployments.
Supply support for INA296A4IDR 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 ICs.
The INA296x product line was designed specifically for ultra-precise, high-bandwidth current sensing in next-generation 48V power architectures - targeting datacenter, telecom, and electric vehicle subsystems demanding ±0.01% gain accuracy and 110V common-mode resilience.
FAQ
What is the maximum common-mode voltage the INA296A4IDR can withstand continuously?
The INA296A4IDR supports continuous operation from −5V to 110V common-mode voltage, with survival rating up to −20V to 120V per absolute maximum ratings. This enables direct placement on 48V bus lines without level-shifting circuitry and accommodates negative transients in industrial motor drives.
Can the INA296A4IDR be used for unidirectional current sensing only?
Yes, the INA296A4IDR supports unidirectional operation by connecting both REF1 and REF2 to GND (for ground-referenced output) or to VS (for supply-referenced output). In this mode, the output swings from near-GND to near-VS proportional to current magnitude and polarity, simplifying ADC interfacing in single-direction applications like PSU input monitoring.
What package type is supplied for the INA296A4IDR orderable part number?
The INA296A4IDR is supplied in SOIC-8 (D package), measuring 4.9mm × 6mm with standard 1.27mm lead pitch. This package provides robust thermal performance (RθJA = 122.9°C/W) and is compatible with automated SMT assembly processes used in high-volume power supply manufacturing.
How does the INA296A4IDR achieve stable input bias current across its full common-mode range?
The INA296A4IDR uses a proprietary input stage architecture that isolates bias current generation from common-mode voltage stress, maintaining a stable 35µA (typ) per input across −20V to 120V. This eliminates VCM-dependent gain errors seen in conventional high-voltage amplifiers, ensuring consistent accuracy in 48V BMS and telecom rectifier applications.
Is external compensation required for the INA296A4IDR when driving capacitive loads?
No external compensation is required for capacitive loads up to 1nF, as specified in the datasheet. The INA296A4IDR's output stage is internally compensated for unity-gain stability into typical ADC input capacitances and PCB trace capacitance, simplifying layout and eliminating risk of oscillation in high-density 48V power modules.
INA296A4IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 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:
- 8-SOIC
INA296A4IDR FAQ
1.How can I place an order for INA296A4IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA296A4IDR 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 INA296A4IDR reliable?
The price and inventory of INA296A4IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA296A4IDR is usually 5 days.
3.What payment methods are accepted for INA296A4IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA296A4IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA296A4IDR?
INA296A4IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA296A4IDR 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 INA296A4IDR?
For technical support, including INA296A4IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA296A4IDR requirements.
6.How does Aetrix verify that INA296A4IDR is sourced from the original manufacturer or authorized distributors?
All INA296A4IDR 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 INA296A4IDR meets industry standards.
7.What is the process for return or replacement of INA296A4IDR?
All INA296A4IDR units undergo pre-shipment inspection (PSI). If there is an issue with INA296A4IDR, 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 INA296A4IDR part is unused and in its original packaging.
Return procedure for INA296A4IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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