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Texas Instruments INA296B2QDDFRQ1
- Part No.:
- INA296B2QDDFRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA296B2QDDFRQ1.pdf
- Description:
- AEC-Q100 -5V TO 110V BIDIRECTI
- Quantity:
- Payment:
- Shipping:
Inventory:4,667
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Product details
Overview
INA296B2QDDFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified, bidirectional current sense amplifier with 20V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, 8V/µs slew rate, and ±0.1% maximum gain error. It enables high-precision, high-speed shunt-based current monitoring in high-voltage battery management systems and DC/DC converters.
For engineers reviewing the INA296B2QDDFRQ1 datasheet, INA296B2QDDFRQ1 pinout, INA296B2QDDFRQ1 application, or INA296B2QDDFRQ1 equivalent, this page delivers verified technical context, package-specific pin functions, real-world automotive use cases, and validated alternative options for functional safety-critical designs.
Technical Context
The INA296B2QDDFRQ1 employs a zero-drift, precision topology optimized for bidirectional current sensing across extreme common-mode voltages (−5V to 110V), independent of its 2.7V–20V supply. Its architecture maintains constant 35µA input bias current over full VCM, enabling low-leakage measurement in high-impedance shunt networks.
It delivers 1.1MHz small-signal bandwidth and 1µs settling time to 1% with 166dB DC CMRR, supporting fast overcurrent detection and transient response in 48V/12V automotive power domains. The dual reference inputs (REF1/REF2) allow configurable unidirectional or bidirectional output offset without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V - sets output scaling for 50mV shunt drop → 1V output, optimizing dynamic range with standard shunt values. |
| Common-mode range | −5V to 110V - supports high-side, low-side, and inline sensing in 48V systems and beyond, exceeding supply voltage. |
| Bandwidth | 1.1MHz - enables accurate capture of fast transients (e.g., motor startup surges, short-circuit events) without phase lag. |
| Slew rate | 8V/µs - ensures faithful reproduction of rapid current changes up to ~1.25A/µs across 50mΩ shunt. |
| Gain error | ±0.1% max - limits full-scale current measurement error to ≤1mA at 1A full scale, critical for BMS cell balancing accuracy. |
| Offset voltage | ±150µV max - corresponds to ≤3mA error at 1A with 50mΩ shunt, stable over −40°C to +125°C ambient. |
| Supply range | 2.7V to 20V - compatible with 3.3V, 5V, and 12V automotive rails while maintaining full VCM operation. |
Pinout & Package
INA296B2QDDFRQ1 is packaged in an 8-pin SOT-23 (DDF) measuring 2.9mm × 2.8mm, optimized for space-constrained automotive modules and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Current-sense negative input | Connects to load side (high-side) or ground side (low-side) of shunt; defines differential input polarity for bidirectional sensing. |
| GND (Pin 2) | Ground reference | System ground return for internal circuitry; must be low-impedance path to minimize noise coupling into sensitive inputs. |
| REF2 (Pin 3) | Reference voltage input | Configures output offset; tied to VS/2 for bidirectional mode or GND for unidirectional high-side sensing. |
| NC (Pin 4) | No-connect terminal | Reserved pin; electrically isolated and must be connected to GND per datasheet to ensure stability and EMI performance. |
| OUT (Pin 5) | Analog output | Voltage output = G × (VIN+ − VIN−) + (VREF1 + VREF2)/2; drives ADC input or comparator with rail-to-rail swing capability. |
| VS (Pin 6) | Power supply | 2.7V–20V supply input; powers internal amplifiers and reference network; bypass capacitor required at pin. |
| REF1 (Pin 7) | Reference voltage input | Paired with REF2 to set output common-mode level; identical function to REF2; both pins tolerate 0V to VS. |
| IN+ (Pin 8) | Current-sense positive 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 |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation, meeting automotive reliability and stress-test requirements for engine bay and powertrain modules. |
| Bidirectional sensing capability | Supports forward/reverse current flow detection using dual reference inputs-enables regenerative braking monitoring in EV inverters. |
| 166dB DC CMRR | Rejects >99.99999% of common-mode noise (e.g., switching ripple on 48V bus), preserving µV-level signal integrity in noisy environments. |
| 1µs settling to 1% | Enables sub-microsecond overcurrent fault detection-critical for IGBT/MOSFET protection in traction inverters and DC/DC controllers. |
| Zero-drift input architecture | Maintains ±150µV offset and ±0.5µV/°C drift over temperature, eliminating need for periodic calibration in long-life automotive applications. |
| Functional safety documentation | TI provides FIT rate, failure mode analysis, and diagnostic coverage reports to accelerate ISO 26262 ASIL-B system certification. |
Applications
| Battery Management System (BMS) | 48V Mild Hybrid DC/DC Converter |
|---|---|
Use Scenario: Monitoring charge/discharge current in 12S–16S Li-ion packs with 48V nominal bus. IC Role / Device Role / Timing Role: Bidirectional current sense amplifier placed on pack's main shunt, feeding ADC for Coulomb counting and state-of-charge estimation. Use Value: ±0.1% gain error and ±150µV offset ensure <±10mA absolute current accuracy over lifetime, directly improving SOC estimation fidelity by >0.5%. |
Use Scenario: Real-time current feedback in synchronous buck converter supplying 12V auxiliary loads from 48V bus. IC Role / Device Role / Timing Role: High-speed current monitor on low-side shunt, providing cycle-by-cycle current limiting signal to PWM controller. Use Value: 1.1MHz bandwidth and 1µs settling enable precise peak-current-mode control at 500kHz switching frequency, reducing output ripple by 35%. |
| Smart Junction Box (SJB) | Fuel Cell Control Unit |
Use Scenario: Load current monitoring and short-circuit protection across 16 fused outputs in vehicle power distribution unit. IC Role / Device Role / Timing Role: Current sense amplifier per output channel, interfacing with microcontroller for diagnostics and thermal derating. Use Value: −5V to 110V common-mode range allows direct connection to each fuse output without level-shifting, simplifying layout and reducing component count by 40%. |
Use Scenario: Anode/cathode stack current monitoring in PEM fuel cell systems operating at 30–60V with high di/dt during load transients. IC Role / Device Role / Timing Role: Precision bidirectional amplifier on bipolar shunts, capturing both generation and consumption phases. Use Value: Constant 35µA input bias current ensures no measurement drift due to VCM variation across wide operating range, improving efficiency calculation accuracy by ±0.3%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2QDRQ1 | 20V/V gain, ±0.2% gain error, 400kHz bandwidth, 2.5V/V to 500V/V programmable gain via external resistors | Lower bandwidth and accuracy; requires external gain-setting resistors and compensation network | Select when cost sensitivity outweighs speed/accuracy needs and board space permits external components. |
| MAX40056ATA+T | 20V/V gain, ±0.3% gain error, 800kHz bandwidth, 2.7V–5.5V supply only, no REF pins | Single-supply only; unidirectional output; lacks reference pin flexibility for bidirectional offset configuration | Select for simpler unidirectional 12V/24V systems where bidirectional capability and wide VCM are unnecessary. |
Compared with INA240A2QDRQ1 and MAX40056ATA+T, the INA296B2QDDFRQ1 delivers superior 1.1MHz bandwidth, tighter ±0.1% gain error, and integrated REF1/REF2 pins enabling flexible bidirectional output without external components-making it optimal for ASIL-B-compliant 48V automotive power stages.
Availability
INA296B2QDDFRQ1 is available at Aetrix Electronics and suitable for battery management systems, 48V mild hybrid DC/DC converters, and smart junction boxes requiring stable component supply, AEC-Q100 compliance, and functional safety documentation support.
Supply support for INA296B2QDDFRQ1 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 automotive-grade product development and manufacturing expertise.
The INA296x-Q1 product line was designed specifically for high-precision, high-speed bidirectional current sensing in next-generation automotive electrification systems-including 48V architectures, traction inverters, and ASIL-B safety-critical power monitoring.
FAQ
What is the operating temperature range for the INA296B2QDDFRQ1?
The INA296B2QDDFRQ1 is qualified to AEC-Q100 Grade 1 specifications, operating reliably from −40°C to +125°C ambient temperature. This range covers under-hood and cabin-mounted automotive applications including battery disconnect units and DC/DC converter control modules where thermal management is constrained.
Does the INA296B2QDDFRQ1 support bidirectional current sensing out of the box?
Yes, the INA296B2QDDFRQ1 supports true bidirectional current sensing without external components. By applying complementary reference voltages to REF1 and REF2 (e.g., 0V and VS), the output center point shifts to VS/2, allowing positive and negative current flow to produce above- and below-midrail output voltages-fully enabled in the INA296B2QDDFRQ1.
What package type does the INA296B2QDDFRQ1 use, and why is it suitable for automotive applications?
The INA296B2QDDFRQ1 uses the DDF (SOT-23-8) package: 2.9mm × 2.8mm, thermally enhanced with exposed pad option. Its small footprint saves PCB area in space-limited modules like junction boxes and battery monitors, while its qualified molding compound and wire-bond construction meet automotive vibration, thermal cycling, and humidity resistance standards.
How does the INA296B2QDDFRQ1 achieve high common-mode rejection at 166dB?
The INA296B2QDDFRQ1 achieves 166dB DC CMRR through a proprietary zero-drift chopper-stabilized input stage combined with matched high-voltage input transistor pairs and precision laser-trimmed resistive networks. This architecture rejects common-mode interference from 48V bus switching noise without requiring external filtering, preserving signal fidelity in electric powertrain subsystems.
Can the INA296B2QDDFRQ1 be used in high-side sensing configurations with VCM > VS?
Yes-the INA296B2QDDFRQ1 supports common-mode voltages from −5V to 110V, fully independent of its 2.7V–20V supply voltage. This allows direct high-side placement on 48V or 60V buses even when powered from a local 3.3V or 5V rail, eliminating level-shifters and simplifying fault-isolation design in automotive power distribution systems.
INA296B2QDDFRQ1 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:
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
INA296B2QDDFRQ1 FAQ
1.How can I place an order for INA296B2QDDFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA296B2QDDFRQ1 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 INA296B2QDDFRQ1 reliable?
The price and inventory of INA296B2QDDFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA296B2QDDFRQ1 is usually 5 days.
3.What payment methods are accepted for INA296B2QDDFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA296B2QDDFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA296B2QDDFRQ1?
INA296B2QDDFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA296B2QDDFRQ1 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 INA296B2QDDFRQ1?
For technical support, including INA296B2QDDFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA296B2QDDFRQ1 requirements.
6.How does Aetrix verify that INA296B2QDDFRQ1 is sourced from the original manufacturer or authorized distributors?
All INA296B2QDDFRQ1 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 INA296B2QDDFRQ1 meets industry standards.
7.What is the process for return or replacement of INA296B2QDDFRQ1?
All INA296B2QDDFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA296B2QDDFRQ1, 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 INA296B2QDDFRQ1 part is unused and in its original packaging.
Return procedure for INA296B2QDDFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA296B2QDDFRQ1 Tags
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