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Texas Instruments INA296B1IDDFR
- Part No.:
- INA296B1IDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA296B1IDDFR.pdf
- Description:
- -5-V TO 110-V, BIDIRECTIONAL, 1.
- Quantity:
- Payment:
- Shipping:
Inventory:2,249
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Product details
Overview
INA296B1IDDFR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier with 10V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, and ±150µV max input offset voltage. It operates from 2.7V to 20V supply and delivers fast 1µs settling to 1% for high-speed overcurrent detection in 48V BMS and DC/DC converters.
For engineers reviewing the INA296B1IDDFR datasheet, INA296B1IDDFR pinout, INA296B1IDDFR application, or INA296B1IDDFR equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for precision high-voltage current sensing designs.
Technical Context
The INA296B1IDDFR uses a zero-drift, high-common-mode topology enabling operation beyond its supply rails (e.g., −5V to 110V CMV while powered from 5V), with constant 35µA input bias current across full CMV range. Its 1.1MHz bandwidth and 8V/µs slew rate support transient detection in fast-switching power stages.
It implements dual reference inputs (REF1/REF2) to configure unidirectional or bidirectional output centering - e.g., connecting REF1 to VS and REF2 to GND sets mid-supply output for bidirectional current flow, enabling direct ADC interfacing without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V - fixed ratio; enables precise scaling of shunt voltage to measurable output range (e.g., 100mV shunt drop → 1V output). |
| Common-mode range | −5V to 110V - supports high-side, low-side, and inline sensing in 48V systems with negative rail tolerance and overvoltage survival up to 120V. |
| Bandwidth | 1.1MHz - ensures accurate capture of fast current transients (e.g., MOSFET switching edges) without phase lag or attenuation. |
| Offset voltage (max) | ±150µV - limits measurement error to ≤1.5mV at 10× gain; critical for low-value shunts (<1mΩ) in high-current applications. |
| Supply range | 2.7V to 20V - compatible with 3.3V, 5V, and 12V logic domains while maintaining full CMV performance. |
| Settling time (to 1%) | 1µs - enables reliable overcurrent response within one switching cycle of 500kHz–1MHz power converters. |
| CMRR | 120dB (min), 130dB (typ) - rejects noise from noisy bus voltages (e.g., 48V rail ripple), preserving signal integrity in EMI-heavy environments. |
Pinout & Package
INA296B1IDDFR is packaged in an 8-pin SOT-23 (DDF) measuring 2.9mm × 2.8mm, optimized for space-constrained high-density PCB layouts in server PSU and telecom power modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Negative current-sense input | Connects to load side of shunt in high-side config or ground side in low-side config; differential pair with IN+ defines VSENSE. |
| GND (Pin 2) | Ground reference | Primary return path for supply and internal circuitry; must be low-impedance connection to system ground plane. |
| REF2 (Pin 3) | Reference voltage input | One of two matched inputs setting output center point; tied to GND or VS to configure unidirectional/bidirectional operation. |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure stable operation and EMI immunity. |
| OUT (Pin 5) | Analog output | Amplified, referenced output voltage; drives ADC inputs directly with rail-to-rail swing (20mV above GND, 200mV below VS). |
| VS (Pin 6) | Power supply | 2.7V–20V single supply; bypass with 100nF ceramic capacitor close to pin to suppress high-frequency noise. |
| REF1 (Pin 7) | Reference voltage input | Matches REF2 function; both pins form precision divider network determining output offset; no functional difference between REF1/REF2. |
| IN+ (Pin 8) | Positive current-sense input | Connects to bus-voltage side of shunt in high-side config or load side in low-side config; forms differential pair with IN−. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing capability | Configurable via REF1/REF2 voltage pairing to measure forward/reverse current flow - essential for battery charge/discharge monitoring in BMS. |
| Ultra-low input bias current | 35µA typical, constant across −20V to 120V CMV - avoids shunt measurement errors in high-impedance or low-current paths (e.g., standby leakage detection). |
| High-speed transient response | 1µs settling to 1% with 1.1MHz bandwidth - enables real-time overcurrent protection in <1µs-critical applications like macro RRU power stages. |
| Wide supply independence | Operates from 2.7V to 20V while maintaining full −5V to 110V CMV range - allows use with diverse control rails without sacrificing sensing headroom. |
| Precision reference architecture | Matched REF1/REF2 inputs with ±0.02% reference divider accuracy - eliminates need for external op-amps or DACs to set output zero point in bidirectional systems. |
Applications
| 48V Battery Management System (BMS) | 48V DC/DC Converter |
|---|---|
Use Scenario: Monitoring bidirectional current during battery charging and discharging in rack-mounted energy storage units. IC Role / Device Role / Timing Role: High-side current sense amplifier providing isolated, rail-independent analog output for MCU ADC sampling at 100ksps. Use Value: ±150µV offset enables sub-1A resolution with 500µΩ shunt; 1.1MHz bandwidth captures fast load transients during dynamic power allocation. | Use Scenario: Real-time primary-side current sensing for peak-current-mode control and overcurrent shutdown in telecom rectifiers. IC Role / Device Role / Timing Role: Fast-settling analog front-end delivering 1µs-response feedback to PWM controller for cycle-by-cycle current limiting. Use Value: 1µs settling ensures fault detection within first switching cycle at 1MHz; −5V to 110V CMV accommodates negative spikes during MOSFET turn-off. |
| Macro Remote Radio Unit (RRU) | 48V Rack Server Power Distribution |
Use Scenario: Detecting short-circuit faults in high-power RF amplifier stages operating from 48V intermediate bus. IC Role / Device Role / Timing Role: High-speed current monitor feeding comparator-based protection logic with sub-microsecond latency. Use Value: 8V/µs slew rate prevents output saturation during fast di/dt events; 120dB CMRR rejects coupling from adjacent RF power amplifiers. | Use Scenario: Per-rail current telemetry for intelligent power budgeting and thermal management in multi-ASIC server blades. IC Role / Device Role / Timing Role: Precision analog sensor interfaced to I²C ADC for firmware-controlled current logging and alerting. Use Value: ±0.1% gain error ensures consistent calibration across 100+ units; SOT-23-8 footprint minimizes board area in dense VRM layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1IDR | 10V/V gain, −4V to 80V CMV, 4V/µs slew, ±120µV offset, SOIC-8 only | Limited to 80V max CMV; not suitable for 110V surge-tolerant designs or negative-rail systems | Select when cost sensitivity outweighs extended CMV range and higher speed requirements. |
| MAX40056ASA+ | 10V/V gain, −0.1V to 65V CMV, 0.5MHz BW, ±100µV offset, 8-pin SOIC | Lower bandwidth and narrower CMV range; lacks REF1/REF2 flexibility for bidirectional centering | Prefer for lower-cost, lower-speed 48V-only applications where mid-supply referencing is handled externally. |
Compared with INA296B1IDDFR, INA240A1IDR offers tighter offset but sacrifices 30V CMV headroom and half the slew rate, while MAX40056ASA+ trades bandwidth and reference flexibility for lower unit cost in non-bidirectional, 65V-max systems.
Availability
INA296B1IDDFR is available at Aetrix Electronics and suitable for 48V battery management systems, telecom DC/DC converters, and rack server power distribution requiring stable component supply and long-term production continuity.
Supply support for INA296B1IDDFR 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-reliability power management ICs.
The INA296x product line was engineered specifically for ultra-precise, high-bandwidth current sensing in next-generation 48V infrastructure - targeting BMS, server PSUs, and macro RRU applications demanding rail-independent operation and sub-microsecond fault response.
FAQ
What is the maximum common-mode voltage the INA296B1IDDFR can withstand during normal operation?
The INA296B1IDDFR supports a continuous operational common-mode input range of −5V to 110V. This allows it to accurately sense current in high-side configurations on 48V buses with significant overshoot or undershoot, including negative transients down to −5V. Its survival rating extends to −20V to 120V, ensuring robustness against short-duration voltage spikes without damage.
How does the INA296B1IDDFR achieve bidirectional current measurement?
The INA296B1IDDFR achieves bidirectional measurement by using its dual reference inputs (REF1 and REF2) to set the output's zero-current baseline. When REF1 is connected to VS and REF2 to GND, the output centers at VS/2 - positive current produces voltage above VS/2, negative current produces voltage below VS/2. This eliminates need for external level-shifting circuitry and enables direct interfacing with ratiometric ADCs.
Can the INA296B1IDDFR be used with a 3.3V supply while sensing on a 48V bus?
Yes, the INA296B1IDDFR can operate from a 3.3V supply while sensing across a 48V bus. Its common-mode input range (−5V to 110V) is fully independent of supply voltage. The output swings from ~20mV above GND to ~200mV below VS, so with 3.3V supply, output ranges from 20mV to 3.1V - compatible with most 3.3V ADCs. Bypassing VS with 100nF ceramic capacitor is mandatory for stability.
What is the purpose of the NC pin (Pin 4) on the INA296B1IDDFR DDF package?
Pin 4 on the INA296B1IDDFR is designated NC (No Connect) but must be externally connected to GND per Texas Instruments' datasheet guidance. This connection stabilizes internal bias networks, reduces susceptibility to EMI, and ensures specified CMRR and offset performance. Leaving Pin 4 floating may degrade accuracy and increase noise susceptibility, particularly in high-CMV applications like 48V BMS monitoring.
How does the INA296B1IDDFR's 1.1MHz bandwidth benefit overcurrent protection circuits?
The INA296B1IDDFR's 1.1MHz bandwidth enables faithful reproduction of fast current transients - such as those occurring during MOSFET turn-on or short-circuit events - without attenuation or phase shift. Combined with 1µs settling to 1%, it allows overcurrent detection within a single switching cycle of modern 500kHz–1MHz DC/DC converters, supporting cycle-by-cycle current limiting and preventing destructive energy buildup before traditional digital protection loops respond.
INA296B1IDDFR 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
INA296B1IDDFR FAQ
1.How can I place an order for INA296B1IDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA296B1IDDFR 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 INA296B1IDDFR reliable?
The price and inventory of INA296B1IDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA296B1IDDFR is usually 5 days.
3.What payment methods are accepted for INA296B1IDDFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA296B1IDDFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA296B1IDDFR?
INA296B1IDDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA296B1IDDFR 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 INA296B1IDDFR?
For technical support, including INA296B1IDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA296B1IDDFR requirements.
6.How does Aetrix verify that INA296B1IDDFR is sourced from the original manufacturer or authorized distributors?
All INA296B1IDDFR 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 INA296B1IDDFR meets industry standards.
7.What is the process for return or replacement of INA296B1IDDFR?
All INA296B1IDDFR units undergo pre-shipment inspection (PSI). If there is an issue with INA296B1IDDFR, 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 INA296B1IDDFR part is unused and in its original packaging.
Return procedure for INA296B1IDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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