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Texas Instruments INA296B1IDR
- Part No.:
- INA296B1IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA296B1IDR.pdf
- Description:
- -5-V TO 110-V, BIDIRECTIONAL, 1.
- Quantity:
- Payment:
- Shipping:
Inventory:2,186
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Product details
Overview
INA296B1IDR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for 48V systems, featuring 10V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, 8V/µs slew rate, and ±150µV max input offset voltage. It enables high-speed overcurrent detection in DC/DC converters and battery management systems.
For engineers reviewing the INA296B1IDR datasheet, INA296B1IDR pinout, INA296B1IDR application, or INA296B1IDR equivalent, this page delivers verified specifications, package mapping, functional pin roles, real-world use cases, and validated alternative options - all aligned with TI's SBOSA04D production data sheet (Dec 2024).
Technical Context
The INA296B1IDR employs a zero-drift, precision topology enabling stable operation across −40°C to +125°C while maintaining ±0.1% max gain error and ±5ppm/°C drift. Its input stage supports common-mode voltages exceeding supply rails (−5V to 110V), decoupling sensing accuracy from VS (2.7V–20V).
It delivers bidirectional output via dual reference pins (REF1/REF2), allowing mid-supply (±VSENSE × 10) or rail-referenced configurations. With 35µA typical input bias current independent of VCM and 1µs 1% settling time, it supports fast transient response in protection-critical 48V power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V - sets output = 10 × (VIN+ − VIN−); enables use with low-value shunts (e.g., 0.5mΩ at 100A yields 500mV full-scale) |
| Common-mode range | −5V to 110V - supports high-side, low-side, and inline sensing in 48V/60V bus systems without level-shifting |
| Bandwidth | 1.1MHz - ensures accurate capture of fast current transients (e.g., MOSFET switching edges, OCP triggers) |
| Input offset voltage | ±150µV max - limits measurement error to ≤15µA at 0.1Ω shunt; critical for low-current standby monitoring |
| Slew rate | 8V/µs - sustains linear output response during 100mV/12.5ns input steps, avoiding distortion in pulse-width modulated loads |
| Supply range | 2.7V to 20V - powers from local LDOs in multi-rail systems; output swing stays within 20mV–200mV of rails |
| Quiescent current | 2.5mA - enables integration into always-on monitoring paths without excessive power overhead |
Pinout & Package
SOT-23-8 package (DDF), 2.9mm × 2.8mm footprint, thermally enhanced for high-density 48V PCB layouts.
| 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; defines differential polarity |
| GND (Pin 2) | Ground reference | System ground return for internal circuitry; must be low-impedance path to minimize noise coupling |
| REF2 (Pin 3) | Reference voltage input | One half of adjustable output offset network; paired with REF1 to set mid-point output baseline |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be tied to GND per datasheet to ensure stability and EMI performance |
| OUT (Pin 5) | Analog output | Single-ended voltage output = 10×(VIN+−VIN−) + (REF1+REF2)/2; drives 10kΩ min load |
| VS (Pin 6) | Power supply | 2.7V–20V analog supply; powers internal amplifiers and reference network; bypass with 100nF ceramic |
| REF1 (Pin 7) | Reference voltage input | Second half of offset control; identical function to REF2; both pins used together for bidirectional centering |
| IN+ (Pin 8) | Positive current-sense input | Connects to bus-voltage side (high-side) or load side (low-side); completes differential sensing path |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Output swings above/below mid-supply based on current direction; eliminates need for external op-amp inversion |
| High CMRR (130dB min) | Rejects >99.99% of 48V bus ripple at 50kHz, ensuring clean current readout in noisy switch-mode environments |
| Fixed 10V/V gain | Eliminates external gain-setting resistors; guarantees traceable accuracy without layout-induced tolerance drift |
| 1µs 1% settling | Enables cycle-by-cycle current limiting in 500kHz+ DC/DC controllers; meets fast OCP timing budgets |
| −20V to 120V survival rating | Withstands load-dump transients and hot-swap surges in telecom and server PSUs without latch-up or damage |
Applications
| 48V DC/DC Converter | 48V Battery Management System |
|---|---|
Use Scenario: Real-time phase-current monitoring in interleaved buck converters delivering up to 200A to ASICs or FPGAs. IC Role / Device Role / Timing Role: High-side current sense amplifier providing isolated, rail-to-rail compatible feedback to digital PWM controller. Use Value: Enables precise current balancing between phases and fast overcurrent shutdown (<2µs response) to protect MOSFETs and magnetics. | Use Scenario: Cell-string current measurement in 10S–16S Li-ion racks for charge/discharge control and SOC estimation. IC Role / Device Role / Timing Role: Bidirectional shunt monitor interfacing directly to BMS MCU ADC with no signal conditioning. Use Value: ±150µV offset ensures <±0.15A error at 1mΩ shunt, improving Coulomb counting accuracy over temperature. |
| Macro Remote Radio Unit | 48V Rack Server PSU |
Use Scenario: PA bias current sensing in 5G massive MIMO active antenna systems operating at −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Low-drift current amplifier feeding analog front-end of FPGA-based telemetry processor. Use Value: ±5ppm/°C gain drift maintains calibration integrity across wide thermal gradients without periodic re-zeroing. | Use Scenario: Input/output current supervision in redundant 48V–12V intermediate bus converters powering CPU/GPU VRMs. IC Role / Device Role / Timing Role: High-CMRR current sensor rejecting 48V bus noise while reporting load steps to PMBus controller. Use Value: 1.1MHz bandwidth captures 10A/µs load transients, enabling predictive droop compensation before voltage collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA293B1IDBVR | Same 10V/V gain, but 85dB CMRR (vs. 130dB), 200µV max offset, 450kHz bandwidth | Limited to lower-noise, lower-speed 48V applications (e.g., non-critical telemetry); not suitable for fast OCP | Select when cost sensitivity outweighs precision and speed requirements in non-safety-critical monitoring |
| MAX40056ATA+T | 10V/V gain, 120dB CMRR, 125µV max offset, 1.5MHz bandwidth, but only −0.1V to 65V VCM range | Cannot support negative common-mode (e.g., reverse-current fault detection) or >65V bus operation | Choose for higher-bandwidth needs in strictly positive 48V–60V systems where extended VCM is unnecessary |
Compared with INA296B1IDR, INA293B1IDBVR trades 45dB CMRR and 650kHz bandwidth for lower cost, while MAX40056ATA+T extends bandwidth by 400kHz but sacrifices −5V to 110V bidirectional VCM capability - making INA296B1IDR uniquely suited for robust, wide-range 48V infrastructure monitoring.
Availability
INA296B1IDR is available at Aetrix Electronics and suitable for 48V DC/DC converters, battery management systems, and macro remote radio units requiring stable component supply, long-term lifecycle assurance, and TI-qualified automotive-grade reliability.
Supply support for INA296B1IDR 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 power management ICs.
The INA296x product line was engineered specifically for high-voltage, high-speed current sensing in next-generation 48V power architectures - delivering metrology-grade accuracy without sacrificing transient response or ruggedness.
FAQ
What is the maximum common-mode voltage the INA296B1IDR can withstand during normal operation?
The INA296B1IDR operates continuously across a common-mode input range of −5V to 110V, independent of its 2.7V–20V supply voltage. This allows direct connection to 48V, 60V, or even 100V bus lines without external attenuation or isolation. Its survival rating extends to −20V to 120V, covering transient events like load dump or hot-swap surges. The INA296B1IDR maintains specified performance throughout this full operational range.
How does the INA296B1IDR achieve bidirectional current sensing without external components?
The INA296B1IDR achieves true bidirectional sensing using its dual reference inputs (REF1 and REF2). When REF1 is tied to VS and REF2 to GND, the output centers at VS/2. Positive current produces an output above VS/2; negative current pulls it below. This eliminates external op-amps or level-shifters. The INA296B1IDR's internal architecture ensures matched gain and offset across both directions, with no added latency or error sources.
What is the guaranteed input offset voltage specification for the INA296B1IDR over temperature?
The INA296B1IDR has a maximum input offset voltage of ±150µV at room temperature, with a worst-case drift of ±0.5µV/°C over −40°C to +125°C. This results in a total offset envelope of ±210µV across the full temperature range. This specification is production-tested and guaranteed per TI's SBOSA04D datasheet, enabling accurate low-current measurements (e.g., <1A at 1mΩ) even in thermally demanding server or telecom environments.
Can the INA296B1IDR drive standard SAR ADC inputs directly?
Yes - the INA296B1IDR's output drives 10kΩ loads with rail-to-rail swing (within 20mV of GND and 200mV of VS), matching typical SAR ADC input requirements. Its 1.1MHz bandwidth and 1µs settling time ensure fidelity for sampling rates up to 500ksps. For optimal SNR, pair with a 100Ω series resistor and 1nF capacitor at the ADC input to limit noise bandwidth without degrading step response. The INA296B1IDR's low 36nV/√Hz input noise further preserves dynamic range.
Does the INA296B1IDR require external gain-setting resistors or calibration?
No - the INA296B1IDR integrates a laser-trimmed, fixed 10V/V gain amplifier. Its ±0.1% max gain error and ±5ppm/°C drift are factory-characterized and do not require external resistors, trimming, or system-level calibration. This simplifies layout, improves long-term stability, and eliminates resistor tolerance and thermal drift errors. All specifications for the INA296B1IDR - including offset, CMRR, and bandwidth - are guaranteed without user adjustment.
INA296B1IDR 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:
- 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:
- 8-SOIC
INA296B1IDR FAQ
1.How can I place an order for INA296B1IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA296B1IDR 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 INA296B1IDR reliable?
The price and inventory of INA296B1IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA296B1IDR is usually 5 days.
3.What payment methods are accepted for INA296B1IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA296B1IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA296B1IDR?
INA296B1IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA296B1IDR 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 INA296B1IDR?
For technical support, including INA296B1IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA296B1IDR requirements.
6.How does Aetrix verify that INA296B1IDR is sourced from the original manufacturer or authorized distributors?
All INA296B1IDR 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 INA296B1IDR meets industry standards.
7.What is the process for return or replacement of INA296B1IDR?
All INA296B1IDR units undergo pre-shipment inspection (PSI). If there is an issue with INA296B1IDR, 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 INA296B1IDR part is unused and in its original packaging.
Return procedure for INA296B1IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA296B1IDR Tags
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