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Texas Instruments INA296B2IDDFR
- Part No.:
- INA296B2IDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA296B2IDDFR.pdf
- Description:
- -5-V TO 110-V, BIDIRECTIONAL, 1.
- Quantity:
- Payment:
- Shipping:
Inventory:2,345
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Product details
Overview
INA296B2IDDFR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for 48V high-voltage DC/DC converters and battery management systems. It operates over −5V to 110V common-mode range, delivers 20V/V fixed gain, 1.1MHz bandwidth, 8V/µs slew rate, and ±150µV max input offset voltage (±0.5µV/°C drift) in an 8-pin SOT-23 package.
For engineers reviewing the INA296B2IDDFR datasheet, INA296B2IDDFR pinout, INA296B2IDDFR application, or INA296B2IDDFR equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The INA296B2IDDFR uses a zero-drift, high-common-mode topology enabling precise bidirectional current measurement independent of supply voltage - supporting high-side, low-side, and inline shunt configurations. Its input bias current remains constant at 35µA (typ) across the full −20V to 120V survival range, eliminating CMV-dependent leakage errors.
It features dual reference inputs (REF1/REF2) that configure output mid-point voltage for unidirectional or bidirectional operation without external components. The 20V/V gain version maintains 1.1MHz small-signal bandwidth and 1µs 1% settling time, making it suitable for fast overcurrent detection in 48V server PSUs and macro RRU power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Common-mode range | −5V to 110V operational; enables direct sensing on 48V bus without level-shifting or isolation |
| Fixed gain | 20V/V; scales 10mV shunt drop to 200mV output - optimizes SNR for mid-range current monitoring |
| Bandwidth | 1.1MHz (−3dB); supports transient detection within 1µs for fast OCP response in DC/DC converters |
| Input offset voltage | ±150µV max (±0.5µV/°C drift); ensures <±0.75mV error over −40°C to +125°C at 20× gain |
| CMRR | 130dB min (120–130dB typical); rejects >99.99% of 48V common-mode noise in noisy PSU environments |
| Supply range | 2.7V to 20V; compatible with 3.3V/5V/12V control rails while measuring up to 110V bus |
| Quiescent current | 2.5mA typ; enables low-power monitoring in always-on BMS and telecom power modules |
Pinout & Package
INA296B2IDDFR is housed in an 8-pin SOT-23 package (DDF), measuring 2.9mm × 2.8mm, with exposed pad for thermal enhancement. Pin 4 is NC and must be grounded per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Current-sense positive input | Connect to bus side of shunt in high-side; load side in low-side - defines polarity for bidirectional output swing |
| IN− | Current-sense negative input | Connect to load side in high-side; ground side in low-side - differential pair senses VSENSE = IN+ − IN− |
| GND | Ground reference | Return path for internal circuitry and REF pins; must be low-impedance connection to system ground plane |
| NC | No-connect (grounded) | Reserved pin; TI requires connection to GND to ensure stability and EMI performance |
| OUT | Analog output | Delivers 20×(IN+ − IN−) + (REF1 + REF2)/2; rail-to-rail capable with 20mV headroom to GND and 200mV to VS |
| VS | Power supply | Accepts 2.7V–20V; powers internal amplifier and reference network - output swing bounded by this rail |
| REF1 / REF2 | Reference voltage inputs | Set output mid-point: tie REF1=VS & REF2=GND for bidirectional mode; tie both to GND for unidirectional ground-referenced output |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing architecture | Supports current flow in either direction via configurable REF1/REF2 - eliminates need for dual amplifiers or H-bridge switches |
| Constant 35µA input bias current | Independent of common-mode voltage up to 110V - avoids gain error drift in high-CMV applications like 48V rack servers |
| Zero-drift input stage | Enables stable ±150µV offset over −40°C to +125°C - critical for accurate battery SOC estimation in BMS |
| 1.1MHz bandwidth at all gains | Maintains full signal fidelity for fast transients - allows single-part solution across multiple shunt/resolution trade-offs |
| 166dB CMRR (INA296A) / 130dB (INA296B) | INA296B2IDDFR's 130dB minimum rejects switching noise from adjacent MOSFETs in high-density 48V PSU layouts |
Applications
| 48V DC/DC Converter | 48V Battery Management System |
|---|---|
Use Scenario: Real-time phase-current monitoring in interleaved buck converters delivering up to 100A to AI accelerators. IC Role / Device Role / Timing Role: High-side current sense amplifier feeding ADC input of digital controller; measures VSENSE with 1µs response for cycle-by-cycle OCP. Use Value: Enables fast fault shutdown (<2µs) while maintaining ±0.5% full-scale accuracy across temperature - improves converter reliability and MTBF. |
Use Scenario: Cell-string current monitoring in 13S–16S Li-ion packs for datacenter UPS and telecom backup systems. IC Role / Device Role / Timing Role: Bidirectional shunt amplifier interfacing to isolated sigma-delta ADC; supports charge/discharge current tracking with single device. Use Value: Eliminates need for separate charge/discharge sensors - reduces BOM count, PCB area, and calibration complexity in compact module designs. |
| Macro Remote Radio Unit | 48V Rack Server Power Supply |
Use Scenario: Output current monitoring in GaN-based envelope-tracking power amplifiers for 5G massive MIMO base stations. IC Role / Device Role / Timing Role: Low-latency current feedback element in closed-loop RF power control loop; operates at 1.1MHz bandwidth to track dynamic PAPR signals. Use Value: Maintains linearity under fast 48V bus transients (e.g., lightning surge events), preventing false RF clipping alarms during field deployment. |
Use Scenario: Input current supervision in multi-phase VR14/VR15 compliant server PSUs with PMBus telemetry. IC Role / Device Role / Timing Role: Primary current sense for digital power controller; feeds real-time IIN data to microcontroller via analog interface or integrated ADC. Use Value: Delivers ±0.1% gain error stability over lifetime - ensures accurate power budgeting and thermal derating without periodic recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2QDR | 20V/V gain, ±50µV max offset, 420kHz BW, SOIC-8 only | Lower bandwidth limits use in fast transient detection; SOIC-8 footprint incompatible with DDF space-constrained layouts | Select when cost sensitivity outweighs speed requirements and board space permits larger package |
| MAX40056ATA+T | 20V/V gain, ±100µV max offset, 1.5MHz BW, 10-pin µMAX | Higher bandwidth but no REF1/REF2 flexibility - fixed unidirectional output; requires external level-shifting for bidirectional use | Select when maximum speed is critical and bidirectional capability can be implemented externally |
Compared with INA296B2IDDFR, INA240A2QDR trades bandwidth and package size for lower offset, while MAX40056ATA+T offers higher bandwidth but lacks configurable bidirectional output - making INA296B2IDDFR uniquely suited for compact, high-CMV, software-configurable current monitoring in 48V infrastructure.
Availability
INA296B2IDDFR is available at Aetrix Electronics and suitable for 48V DC/DC converters, 48V battery management systems, and macro remote radio unit (RRU) power stages requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for INA296B2IDDFR 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 monitoring in next-generation 48V power architectures - targeting datacenter, telecom, and industrial systems where reliability, thermal stability, and layout simplicity are critical.
FAQ
What is the maximum common-mode voltage the INA296B2IDDFR can withstand continuously?
The INA296B2IDDFR supports continuous operation from −5V to 110V common-mode input voltage. Its survival rating extends to −20V to 120V, allowing robust handling of transient overvoltage events in 48V systems without latch-up or damage - verified per TI SBOSA04D Absolute Maximum Ratings table.
Can the INA296B2IDDFR measure bidirectional current without external components?
Yes. The INA296B2IDDFR achieves true bidirectional sensing using only its internal REF1 and REF2 pins: connect REF1 to VS and REF2 to GND to set output mid-supply (e.g., 2.5V at 5V supply), enabling symmetric positive/negative output swing relative to that midpoint - no external op-amps or level shifters required.
How does the 20V/V gain of INA296B2IDDFR affect shunt resistor selection?
With 20V/V gain, a 10mV shunt drop produces 200mV output - ideal for 12-bit ADCs with 3.3V reference. For 50A full-scale current, a 200µΩ shunt yields 10mV drop and only 50W power loss. This balances resolution, self-heating, and dynamic range better than lower-gain alternatives in 48V BMS applications.
Is the SOT-23-8 (DDF) package of INA296B2IDDFR thermally adequate for 2.5mA quiescent current in enclosed environments?
Yes. The DDF package has RθJA = 129.7°C/W. At 2.5mA and 5V supply (12.5mW dissipation), junction rise is ~1.6°C above ambient - well within −40°C to +125°C operating range. TI recommends 25mm² copper pour under the exposed pad for optimal thermal performance in high-density layouts.
Does the INA296B2IDDFR require input filtering for EMI suppression in switch-mode power supplies?
TI recommends a 100Ω resistor + 1nF capacitor (RC filter) at IN+/IN− per datasheet Section 8.4 Layout. This preserves 1.1MHz bandwidth while attenuating >10MHz switching noise from adjacent MOSFETs - critical for maintaining 130dB CMRR in 48V PSU designs where layout parasitics degrade high-frequency rejection.
INA296B2IDDFR 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:
- 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:
- TSOT-23-8
INA296B2IDDFR FAQ
1.How can I place an order for INA296B2IDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA296B2IDDFR 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 INA296B2IDDFR reliable?
The price and inventory of INA296B2IDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA296B2IDDFR is usually 5 days.
3.What payment methods are accepted for INA296B2IDDFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA296B2IDDFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA296B2IDDFR?
INA296B2IDDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA296B2IDDFR 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 INA296B2IDDFR?
For technical support, including INA296B2IDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA296B2IDDFR requirements.
6.How does Aetrix verify that INA296B2IDDFR is sourced from the original manufacturer or authorized distributors?
All INA296B2IDDFR 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 INA296B2IDDFR meets industry standards.
7.What is the process for return or replacement of INA296B2IDDFR?
All INA296B2IDDFR units undergo pre-shipment inspection (PSI). If there is an issue with INA296B2IDDFR, 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 INA296B2IDDFR part is unused and in its original packaging.
Return procedure for INA296B2IDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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