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Texas Instruments INA296A3IDR
- Part No.:
- INA296A3IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA296A3IDR.pdf
- Description:
- -5-V TO 110-V, BIDIRECTIONAL, 1.
- Quantity:
- Payment:
- Shipping:
Inventory:2,340
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Product details
Overview
INA296A3IDR from Texas Instruments is an ultra-precise, bidirectional current sense amplifier optimized for high-voltage DC/DC converters and 48V BMS applications. It operates over −5V to 110V common-mode voltage, delivers 50V/V fixed gain, achieves ±10µV max offset voltage (±0.1µV/°C drift), and features 1.1MHz bandwidth with 8V/µs slew rate.
For engineers reviewing the INA296A3IDR datasheet, INA296A3IDR pinout, INA296A3IDR application, or INA296A3IDR equivalent, this page provides verified specifications, package mapping, functional pin roles, real-world use cases in 48V power systems, and validated alternative options - all confirmed against TI's SBOSA04D datasheet (Dec 2024 revision).
Technical Context
The INA296A3IDR employs a zero-drift, precision topology enabling stable operation across −40°C to +125°C while maintaining ±0.01% max gain error and 166dB CMRR. Its input bias current remains constant at 35µA (typ) up to 110V common-mode voltage - independent of VCM - unlike conventional high-voltage amplifiers.
It supports configurable unidirectional or bidirectional output via dual reference pins (REF1/REF2), allowing mid-supply output (e.g., VS/2) for bidirectional sensing or rail-referenced output for single-direction monitoring. Output swing is specified from 20mV above GND to within 200mV of VS, with 1µs settling time to 1%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V - sets output scaling for 20mV shunt drops to produce 1V full-scale signal; enables low-loss shunt selection in 48V systems. |
| Common-mode range | −5V to 110V - supports high-side, low-side, and inline sensing in 48V/54V bus architectures without level-shifting. |
| Input offset voltage | ±10µV max (±0.1µV/°C drift) - ensures <±0.05% error at 200mA through 100mΩ shunt across full temperature range. |
| Bandwidth & slew rate | 1.1MHz / 8V/µs - captures fast transients (e.g., overcurrent events in <1µs) without distortion in PSU protection circuits. |
| Supply voltage | 2.7V to 20V - decoupled from input common-mode; allows use with 3.3V or 5V logic rails while monitoring 48V–110V buses. |
| Quiescent current | 2.5mA - enables integration into always-on monitoring paths without excessive power overhead in rack servers. |
| Operating temperature | −40°C to +125°C - qualified for under-hood automotive, telecom RRU, and industrial 48V server power supplies. |
Pinout & Package
INA296A3IDR 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's SBOSA04D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Current-sense positive input | Connect to bus side of shunt in high-side config; load side in low-side config - defines polarity for bidirectional output. |
| IN− | Current-sense negative input | Connect to load side of shunt in high-side config; ground side in low-side config - completes differential VSENSE path. |
| GND | Ground reference | System ground return; required for REF1/REF2 referencing and output swing compliance. |
| NC | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure stability and EMI performance. |
| OUT | Analog output | Voltage output = 50 × (VIN+ − VIN−) + (VREF1 + VREF2)/2; rail-to-rail capable within 20mV–200mV margins. |
| VS | Power supply | 2.7V–20V analog supply; powers internal amplifier and reference network - independent of input VCM. |
| REF1 | Reference input 1 | One half of programmable output offset; tied to VS or GND to set unidirectional output, or to complementary rails for bidirectional mid-supply output. |
| REF2 | Reference input 2 | Second reference input; electrically identical to REF1; forms precision divider with REF1 to define output baseline voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing capability | Configurable output polarity via REF1/REF2 - enables true bidirectional current measurement (e.g., charge/discharge in 48V BMS) without external op-amps or level shifters. |
| Ultra-low offset drift | ±0.1µV/°C - reduces thermal-induced error to <±0.0125% over −40°C to +125°C, critical for long-term accuracy in uncooled telecom RRU enclosures. |
| Constant input bias current | 35µA (typ), independent of VCM - eliminates gain error variation across 48V–110V bus voltages, unlike competitive amplifiers where IB scales with VCM. |
| High-speed transient response | 1µs to 1% settling - enables detection of sub-microsecond overcurrent events in 48V merchant PSUs, supporting fast fault shutdown in <2µs. |
| Wide supply–common-mode independence | VS = 2.7V–20V while VCM = −5V–110V - permits use of low-voltage microcontrollers (3.3V) to monitor high-voltage power stages without isolation or level translation. |
Applications
| 48V DC/DC Converter | 48V Battery Management System |
|---|---|
Use Scenario: Real-time current monitoring in isolated 48V–12V buck converters for AI server racks. IC Role / Device Role / Timing Role: High-side current sense amplifier measuring shunt voltage across primary-side MOSFETs during PWM switching. Use Value: Enables precise input current limiting and efficiency optimization using 50V/V gain and 1.1MHz bandwidth to capture ripple and transient peaks. |
Use Scenario: Bidirectional cell-string current monitoring in modular 48V Li-ion battery packs for datacenter UPS. IC Role / Device Role / Timing Role: Low-drift, rail-independent amplifier interfacing with 16-bit ADC for Coulomb counting and state-of-charge estimation. Use Value: ±10µV offset and ±1ppm/°C drift ensure <±0.1% cumulative error over 10-year field life without recalibration. |
| Macro Remote Radio Unit | 48V Rack Server Power Distribution |
Use Scenario: In-line current sensing on 48V backplane feeds powering RF power amplifiers in 5G base stations. IC Role / Device Role / Timing Role: Fast-settling amplifier feeding FPGA-based protection logic for instantaneous overcurrent shutdown. Use Value: 1µs 1% settling time and 8V/µs slew rate allow detection of arc faults before damage occurs in outdoor-rated RRU enclosures. |
Use Scenario: Distributed current monitoring across multiple 48V VRM outputs in high-density GPU servers. IC Role / Device Role / Timing Role: Precision analog front-end for PMBus-compliant digital power controllers requiring accurate current telemetry. Use Value: 166dB CMRR rejects noise from adjacent high-dI/dt VRMs, ensuring clean current reporting even at 100kHz switching frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A3DR | 50V/V gain, but ±120µV max offset (vs. ±10µV), 100kHz bandwidth (vs. 1.1MHz), no REF1/REF2 flexibility. | Limited to unidirectional sensing; insufficient for bidirectional BMS or fast transient detection in RRU. | Select when cost sensitivity outweighs precision and speed requirements; not suitable for 48V BMS charge/discharge balancing. |
| MAX40056ASA+T | 50V/V gain, ±50µV offset, 1.5MHz bandwidth, but only −0.2V to 65V common-mode range (vs. −5V to 110V). | Cannot support negative rail sensing (e.g., −48V telecom systems) or 110V survival margin required in industrial 48V PSUs. | Use where higher bandwidth is needed and common-mode stays below 65V; avoid in high-reliability 48V infrastructure with wide VCM excursions. |
Compared with INA240A3DR and MAX40056ASA+T, the INA296A3IDR uniquely combines ultra-low offset (±10µV), full −5V to 110V common-mode operation, and 1.1MHz bandwidth with dual-reference configurability - making it the only option qualified for precision bidirectional sensing in demanding 48V telecom, server, and BMS applications.
Availability
INA296A3IDR is available at Aetrix Electronics and suitable for 48V DC/DC converter design, 48V battery management systems, and macro remote radio unit (RRU) power monitoring requiring stable component supply and long-term production continuity.
Supply support for INA296A3IDR 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 family was designed specifically for ultra-precise, high-bandwidth current sensing in next-generation 48V power architectures - targeting DC/DC converters, BMS, telecom RRU, and server power distribution where accuracy, speed, and common-mode robustness are non-negotiable.
FAQ
What is the maximum common-mode voltage the INA296A3IDR can withstand continuously?
The INA296A3IDR supports continuous operation from −5V to 110V common-mode voltage per its recommended operating conditions. Its absolute maximum rating extends to −20V to 120V for short-duration survival, but sustained use must remain within the −5V to 110V range to guarantee parametric performance and reliability.
Can the INA296A3IDR be used for bidirectional current sensing in a 48V BMS?
Yes - the INA296A3IDR is explicitly designed for bidirectional sensing. By connecting REF1 to VS and REF2 to GND, the output centers at VS/2, enabling positive output for charge current and negative output (relative to mid-supply) for discharge current - fully supported in INA296A3IDR's electrical specifications and application diagrams.
What package type is supplied for the INA296A3IDR orderable part number?
The "D" suffix in INA296A3IDR denotes the SOIC-8 (D) package: 4.9mm × 6mm body, 1.27mm lead pitch, with industry-standard pinout and thermal characteristics (RθJA = 122.9°C/W). This is distinct from DDF (SOT-23-8) or DGK (VSSOP-8) variants, which share pin functions but differ in footprint and thermal performance.
How does the INA296A3IDR achieve low offset drift across temperature?
The INA296A3IDR uses a precision zero-drift architecture with chopper-stabilized input stage and matched resistor networks. This delivers ±0.1µV/°C max offset drift over −40°C to +125°C - verified in TI's SBOSA04D datasheet Figure 6-6 - enabling stable current measurement without periodic calibration in thermally variable environments like rack-mounted servers.
Is external compensation required for stability with the INA296A3IDR?
No external compensation is required. The INA296A3IDR is unity-gain stable and internally compensated for all five fixed gains (10V/V to 200V/V). Its 1.1MHz bandwidth and 8V/µs slew rate are guaranteed with capacitive loads up to 1nF, as confirmed in Section 6.5 of the SBOSA04D datasheet under "Maximum Capacitive Load".
INA296A3IDR 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
INA296A3IDR FAQ
1.How can I place an order for INA296A3IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA296A3IDR 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 INA296A3IDR reliable?
The price and inventory of INA296A3IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA296A3IDR is usually 5 days.
3.What payment methods are accepted for INA296A3IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA296A3IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA296A3IDR?
INA296A3IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA296A3IDR 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 INA296A3IDR?
For technical support, including INA296A3IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA296A3IDR requirements.
6.How does Aetrix verify that INA296A3IDR is sourced from the original manufacturer or authorized distributors?
All INA296A3IDR 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 INA296A3IDR meets industry standards.
7.What is the process for return or replacement of INA296A3IDR?
All INA296A3IDR units undergo pre-shipment inspection (PSI). If there is an issue with INA296A3IDR, 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 INA296A3IDR part is unused and in its original packaging.
Return procedure for INA296A3IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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