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Texas Instruments PCA9306IDCURQ1
- Part No.:
- PCA9306IDCURQ1
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
PCA9306IDCURQ1.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
PCA9306IDCURQ1 from Texas Instruments is an AEC-Q100 Grade 2 qualified dual bidirectional I²C/SMBus voltage-level translator IC for automotive systems. It enables level translation between 1.2 V and 5 V domains without direction control, supports ≤400-kHz I²C operation with <1.5-ns max propagation delay, and features 3.5-Ω ON-state resistance and 5-V-tolerant I/O ports - used in instrument clusters and driver assistance camera interfaces.
For engineers reviewing the PCA9306IDCURQ1 datasheet, PCA9306IDCURQ1 pinout, PCA9306IDCURQ1 application, or PCA9306IDCURQ1 equivalent, key selection criteria include bidirectional translation capability across mixed-voltage I²C buses, EN-controlled isolation for bus segmentation, thermal performance (RθJA = 275.5°C/W), and automotive-grade ESD robustness (HBM ±2000 V).
Technical Context
The PCA9306IDCURQ1 implements a dual-channel NFET-based pass-gate architecture with shared enable control, supporting independent voltage references VREF1 (1.2–3.3 V) and VREF2 (1.8–5.5 V). Its threshold-dependent switching eliminates need for direction pins while maintaining signal integrity via low on-resistance and matched channel characteristics.
It operates in two functional modes: translation mode (VREF1 ≠ VREF2) for voltage domain bridging, and switch mode (VREF1 = VREF2) for bus isolation or signal gating. EN pin assertion enables bidirectional conduction; deassertion forces high-impedance isolation with lock-up-free behavior and <6 pF off-capacitance per I/O.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF1 Range | 1.2 V to 3.3 V - sets low-side I²C pullup voltage and defines minimum logic-high threshold for SCL1/SDA1 |
| VREF2 Range | 1.8 V to 5.5 V - sets high-side I²C pullup voltage and enables 5-V tolerance on SCL2/SDA2 |
| Max Propagation Delay | <1.5 ns - ensures compatibility with standard-mode (100 kHz) and fast-mode (400 kHz) I²C timing budgets |
| ON-State Resistance | 3.5 Ω (typ) - minimizes voltage drop and signal distortion during active translation |
| ESD Rating (HBM) | ±2000 V - meets AEC-Q100 Grade 2 requirements for automotive electronics reliability |
| Operating Temperature | –40°C to +105°C - qualified for under-hood and cabin-mounted automotive ECUs |
| Off Capacitance | 4–6 pF - isolates bus segments electrically when EN = low, preserving 400-pF I²C capacitance limit |
Pinout & Package
PCA9306IDCURQ1 is housed in an 8-pin VSSOP package (2.30 mm × 2.00 mm) with flow-through pinout optimized for PCB trace routing and minimal crosstalk.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for both voltage domains; must be low-impedance connection to system ground plane |
| VREF1 (Pin 2) | Low-voltage supply reference | Bias source for SCL1/SDA1 pullups; defines logic thresholds for low-side I²C interface |
| SCL1 (Pin 3) | Low-side serial clock | Open-drain input/output connected to 1.2–3.3 V I²C controller or target; requires external pullup to VREF1 |
| SDA1 (Pin 4) | Low-side serial data | Open-drain input/output for bidirectional data on low-voltage I²C bus; requires external pullup to VREF1 |
| SDA2 (Pin 5) | High-side serial data | Open-drain input/output for bidirectional data on 1.8–5.5 V I²C bus; requires external pullup to VREF2 |
| SCL2 (Pin 6) | High-side serial clock | Open-drain input/output connected to high-voltage I²C controller or target; requires external pullup to VREF2 |
| VREF2 (Pin 7) | High-voltage supply reference | Bias source for SCL2/SDA2 pullups; enables 5-V tolerance and sets high-side logic thresholds |
| EN (Pin 8) | Enable control input | Active-high logic input; when low, places all I/O pins in high-impedance state for complete bus isolation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional translation without direction pin | Eliminates GPIO overhead and simplifies firmware by using automatic NFET gate biasing based on VREF1/VREF2 differential |
| Flow-through pinout | Enables straight-line PCB routing between SCL1→SCL2 and SDA1→SDA2, reducing stub length and impedance discontinuity |
| EN-controlled isolation | Allows dynamic segmentation of I²C buses - e.g., isolating 100-kHz peripherals during 400-kHz controller operation |
| 5-V tolerant I/O ports | Permits direct interfacing with legacy 5-V microcontrollers or sensors without external level-shifting components |
| AEC-Q100 Grade 2 qualification | Validated for automotive use at –40°C to +105°C ambient, including HBM ±2000 V and CDM ±750 V ESD stress testing |
Applications
| Automotive Instrument Clusters | ADAS Camera Modules |
|---|---|
Use Scenario: Interfacing a 3.3-V MCU with multiple 1.8-V display drivers and EEPROMs within a digital dashboard. IC Role / Device Role / Timing Role: Voltage-level translator enabling bidirectional I²C communication between mismatched voltage domains while preserving timing compliance. Use Value: Eliminates discrete MOSFET translators and reduces BOM count; EN pin allows runtime disabling during display initialization sequences. | Use Scenario: Connecting a 5-V image sensor to a 1.8-V SoC-based vision processor over SMBus in a surround-view camera system. IC Role / Device Role / Timing Role: Dual-channel level shifter translating SCL/SDA signals from 5-V sensor side to 1.8-V processor side with sub-1.5-ns propagation delay. Use Value: Maintains fast-mode I²C timing margins and prevents logic-level misinterpretation that could cause frame sync errors or configuration failures. |
| Automotive Head Units | Remote Board Hot-Insertion |
Use Scenario: Bridging I²C buses between infotainment mainboard (3.3 V) and detachable USB-C accessory module (1.2 V) with dynamic power sequencing. IC Role / Device Role / Timing Role: Bidirectional translator with EN-controlled isolation to prevent bus contention during module insertion/removal. Use Value: Enables safe hot-plug operation by holding EN low until both sides are powered and idle, avoiding SCL glitches that stall I²C state machines. | Use Scenario: Inserting a remote sensor board into a vehicle backplane I²C bus without disrupting ongoing transactions on the main chassis bus. IC Role / Device Role / Timing Role: Bus switch providing galvanic separation until remote board power stabilizes and I²C lines enter IDLE state. Use Value: Prevents data corruption and unintended pulses on SCL during mechanical mating - critical for ASIL-B compliant systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C voltage-level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCA9617AQPWRQ1 | Integrated auto-direction sensing, higher drive strength (100 mA), supports up to 1-MHz I²C; requires no external EN control | Better suited for high-speed or high-current I²C repeater applications; lacks manual EN isolation control | Select TCA9617AQPWRQ1 when automatic direction detection and >400-kHz operation are required; PCA9306IDCURQ1 preferred when deterministic EN-controlled segmentation is needed. |
| SN74AVC4T245QPWRQ1 | Quad-channel, direction-controlled, CMOS-based translator; not I²C-optimized - lacks open-drain support and bus capacitance management | Requires external direction logic and pullup resistors; unsuitable for true I²C/SMBus due to push-pull outputs and higher off-capacitance | Choose SN74AVC4T245QPWRQ1 only for general-purpose GPIO or UART level shifting; PCA9306IDCURQ1 remains mandatory for standards-compliant I²C translation. |
Compared with TCA9617AQPWRQ1 and SN74AVC4T245QPWRQ1, PCA9306IDCURQ1 uniquely combines AEC-Q100 Grade 2 qualification, EN-driven bus isolation, open-drain I²C compatibility, and sub-1.5-ns propagation delay - making it the only option validated for automotive instrument cluster and ADAS camera bus segmentation where deterministic control and timing fidelity are critical.
Availability
PCA9306IDCURQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS camera modules, and head unit subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PCA9306IDCURQ1 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 company specializing in analog, embedded processing, and automotive-grade ICs, with leadership in interface, power management, and signal chain technologies.
The PCA9306IDCURQ1 belongs to TI's automotive-qualified I²C/SMBus translator product line, designed specifically to solve mixed-voltage communication challenges in safety-critical vehicle subsystems such as digital dashboards and driver assistance systems.
FAQ
What is the maximum I²C bus speed supported by the PCA9306IDCURQ1?
The PCA9306IDCURQ1 supports standard-mode (100 kHz) and fast-mode (400 kHz) I²C operation. Its <1.5-ns maximum propagation delay ensures timing compliance even with multiple devices on the bus. While not rated for fast-mode plus (1 MHz), it can be used in segmented configurations where the EN pin disables one side during high-speed transfers on the other - as documented in TI's application note SCPS178C Section 9.1.3.
Can PCA9306IDCURQ1 translate between 1.2 V and 5 V I²C buses?
Yes, the PCA9306IDCURQ1 explicitly supports bidirectional voltage translation between 1.2-V VREF1 and 5-V VREF2, as confirmed in Section 1 Features and Section 5 Description of the datasheet. This enables direct interfacing of ultra-low-power sensors (1.2 V) with legacy 5-V automotive controllers without additional circuitry.
How does the EN pin function in PCA9306IDCURQ1?
The EN pin on PCA9306IDCURQ1 is an active-high enable input. When high, it activates the internal NFET pass gates, connecting SCL1↔SCL2 and SDA1↔SDA2 bidirectionally. When low, all four I/O pins enter high-impedance state with <6 pF off-capacitance - enabling clean bus segmentation and lock-up-free isolation per Section 6 Pin Configuration and Section 9.1.3.
Is PCA9306IDCURQ1 compatible with SMBus and PMBus protocols?
Yes, PCA9306IDCURQ1 is explicitly stated to be compatible with I²C, SMBus, and PMBus in Section 2 Applications and Section 3 Description. Its open-drain I/O structure, voltage translation range, and timing characteristics meet SMBus 3.0 and PMBus 1.3 electrical specifications for voltage-level bridging between mixed-domain systems.
What package type and dimensions does PCA9306IDCURQ1 use?
PCA9306IDCURQ1 uses the VSSOP-8 (DCU) package with nominal body dimensions of 2.30 mm × 2.00 mm and 0.5-mm lead pitch. This compact, surface-mount package is specified in the Device Information table and Mechanical, Packaging, and Orderable Information section (Section 14) of the datasheet.
PCA9306IDCURQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 2
- Voltage - VCCA:
- 1.2 V ~ 3.3 V
- Voltage - VCCB:
- 1.8 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Open Drain, Push-Pull
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Features:
- Auto-Direction Sensing
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFSOP (0.091", 2.30mm Width)
PCA9306IDCURQ1 FAQ
1.How can I place an order for PCA9306IDCURQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9306IDCURQ1 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 PCA9306IDCURQ1 reliable?
The price and inventory of PCA9306IDCURQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9306IDCURQ1 is usually 5 days.
3.What payment methods are accepted for PCA9306IDCURQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9306IDCURQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9306IDCURQ1?
PCA9306IDCURQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9306IDCURQ1 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 PCA9306IDCURQ1?
For technical support, including PCA9306IDCURQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9306IDCURQ1 requirements.
6.How does Aetrix verify that PCA9306IDCURQ1 is sourced from the original manufacturer or authorized distributors?
All PCA9306IDCURQ1 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 PCA9306IDCURQ1 meets industry standards.
7.What is the process for return or replacement of PCA9306IDCURQ1?
All PCA9306IDCURQ1 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9306IDCURQ1, 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 PCA9306IDCURQ1 part is unused and in its original packaging.
Return procedure for PCA9306IDCURQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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