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Texas Instruments PCA9306DCUR
- Part No.:
- PCA9306DCUR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
PCA9306DCUR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,830
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Product details
Overview
PCA9306DCUR from Texas Instruments is a dual bidirectional I²C/SMBus voltage-level translator IC enabling seamless communication between 1.2-V to 3.3-V and 1.8-V to 5.5-V domains without direction control. It features 3.5-Ω typical ON-state resistance, <1.5-ns max propagation delay, and open-drain I²C I/O ports (SCL1/SDA1/SCL2/SDA2) with 5-V tolerance - deployed in server backplanes, industrial controllers, and mixed-voltage embedded systems.
For engineers reviewing the PCA9306DCUR datasheet, PCA9306DCUR pinout, PCA9306DCUR application, or PCA9306DCUR equivalent, key selection criteria include bidirectional translation capability across four VREF1/VREF2 voltage pairings, EN-controlled isolation for bus segmentation, and verified compatibility with standard-mode (100 kHz) and fast-mode (400 kHz) I²C timing budgets.
Technical Context
The PCA9306DCUR implements a dual-channel NFET-based pass-gate architecture with independent VREF1 (1.2–3.3 V) and VREF2 (1.8–5.5 V) supplies, enabling asymmetric voltage translation without external direction logic. Its enable (EN) input controls conduction state, delivering high-impedance isolation when low and sub-1.5-ns propagation delay when active.
Each channel supports bidirectional signal flow via symmetrical SDA/SCL paths with matched electrical characteristics - including ≤5.5-Ω RON at 64 mA, 4–6 pF off-capacitance, and ≤1.4 ns tPHL/tPLH under 50-pF load - ensuring minimal skew and distortion across mixed-speed I²C buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF1 Range | 1.2 V to 3.3 V - sets low-voltage domain reference for SCL1/SDA1; must be ≥0.6 V below VREF2 for translation |
| VREF2 Range | 1.8 V to 5.5 V - sets high-voltage domain reference for SCL2/SDA2; enables 1.2→5 V translation pairs |
| RON (Typ) | 3.5 Ω - ensures minimal voltage drop and signal integrity during 64-mA pass-switch operation |
| Max Propagation Delay | <1.5 ns - supports standard-mode (100 kHz) and fast-mode (400 kHz) I²C timing with margin |
| I/O Voltage Tolerance | 5 V - allows direct connection to 5-V SMBus or PMBus peripherals without level-shifting front-end |
| ESD Rating (HBM) | ±2000 V - protects downstream 1.2/1.8-V controllers from handling-induced transients |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial and telecom infrastructure environments |
Pinout & Package
The PCA9306DCUR is packaged in an 8-pin VSSOP (DCU) measuring 2.3 mm × 3.1 mm, optimized for space-constrained PCB layouts with flow-through pin assignment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Common return path for both voltage domains; required for bias current path and ESD discharge |
| 2 VREF1 | Low-side supply reference | Defines logic thresholds for SCL1/SDA1; must be stable and decoupled to support translation stability |
| 3 SCL1 | Low-voltage I²C clock | Bidirectional open-drain port - connects to 1.2–3.3-V controller or peripheral clock line |
| 4 SDA1 | Low-voltage I²C data | Bidirectional open-drain port - shares same translation path as SCL1 with matched RON and timing |
| 5 SDA2 | High-voltage I²C data | Bidirectional open-drain port - interfaces with 1.8–5.5-V targets (e.g., sensors, EEPROMs, PMBus devices) |
| 6 SCL2 | High-voltage I²C clock | Bidirectional open-drain port - electrically matched to SDA2 for skew-free bus operation |
| 7 VREF2 | High-side supply reference | Defines logic thresholds for SCL2/SDA2; requires external 200-kΩ pull-up to VCC2 per TI layout guidance |
| 8 EN | Enable control input | Active-high logic input - disables translation and isolates domains when low; used for bus segmentation |
Key Features
| Feature | Design Value |
|---|---|
| No-direction-pin translation | Eliminates external control logic and PCB routing complexity for bidirectional I²C signal routing |
| Flow-through pinout | Enables straight trace routing between SCL1↔SCL2 and SDA1↔SDA2, minimizing stub length and crosstalk |
| EN-controlled bus isolation | Allows dynamic disconnection of slower (100 kHz) I²C segments during fast-mode (400 kHz) operation |
| 5-V-tolerant I/O | Permits direct interface with legacy 5-V SMBus peripherals without additional protection circuitry |
| Lockup-free disable mode | Guarantees high-impedance isolation between domains when EN = low - prevents bus contention or latch-up |
Applications
| Server Backplane Interfacing | Industrial Sensor Hub Integration |
|---|---|
Use Scenario: Connecting 1.8-V FPGA management controllers to 3.3-V or 5-V hot-swap power modules and thermal sensors on a multi-rail server motherboard. IC Role / Device Role / Timing Role: Bidirectional voltage translator enabling I²C communication across isolated power domains while preserving timing compliance for PMBus-compliant power sequencing. Use Value: Eliminates need for discrete MOSFET translators and reduces BOM count by consolidating two-channel translation into one 2.3-mm × 3.1-mm package. | Use Scenario: Integrating 1.2-V microcontrollers with 3.3-V analog sensor arrays and 5-V industrial I/O expanders in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Level-shifting bridge between low-power MCU domain and higher-voltage sensor/actuator subsystems, supporting both 100-kHz configuration reads and 400-kHz real-time monitoring bursts. Use Value: Enables EN-driven bus segmentation to isolate legacy 100-kHz sensors during high-speed diagnostics, preventing timing violations. |
| Telecom Router Control Plane | Embedded PC Peripheral Expansion |
Use Scenario: Interfacing 2.5-V baseband processors with 3.3-V optical transceiver modules and 5-V fan controllers in carrier-grade routers. IC Role / Device Role / Timing Role: Dual-channel I²C translator providing galvanic separation between control plane and line-card domains while maintaining SMBus packet integrity. Use Value: Leverages 5-V-tolerant I/O to directly drive legacy telecom modules without level-shifter cascading, reducing signal degradation. | Use Scenario: Adding 1.8-V secure element ICs and 3.3-V display controllers to 5-V x86-based embedded PCs via mini-PCIe or M.2 edge connectors. IC Role / Device Role / Timing Role: Voltage-domain bridge allowing host CPU to communicate with mixed-supply peripherals over shared I²C bus without software reconfiguration. Use Value: Uses flow-through pinout to minimize trace length on dense M.2 carrier boards, preserving signal rise time and noise immunity. |
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 |
|---|---|---|---|
| TCA9617ADGKR | Single-channel, auto-direction sensing, 1.65–5.5-V dual supply, integrated pull-ups, higher RON (10 Ω typ) | Lacks EN pin; unsuitable for dynamic bus isolation; better for simple point-to-point links | Select when automatic direction detection is preferred and EN-controlled segmentation is unnecessary |
| SN74AVC4T245RTER | Quad-channel, direction-controlled, 1.2–3.6-V dual supply, CMOS push-pull outputs (not open-drain) | Requires direction pin and external pull-ups; incompatible with native I²C open-drain topology | Select only for non-I²C protocols (e.g., GPIO, UART) where push-pull drive is acceptable |
Compared with TCA9617ADGKR and SN74AVC4T245RTER, the PCA9306DCUR uniquely delivers EN-enabled bidirectional isolation, true open-drain I²C compatibility, and sub-1.5-ns propagation delay - making it the only option among the three qualified for mixed-speed I²C bus segmentation in telecom and industrial control applications.
Availability
PCA9306DCUR is available at Aetrix Electronics and suitable for server backplane interfacing, industrial sensor hub integration, and telecom router control plane designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for PCA9306DCUR 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, embedded processing, and connectivity solutions, with decades of expertise in interface and power management ICs.
The PCA9306 belongs to TI's I²C/SMBus level translation product line, engineered specifically for robust, low-latency voltage-domain bridging in multi-rail industrial, computing, and communications systems.
FAQ
What voltage combinations does the PCA9306DCUR support for bidirectional translation?
The PCA9306DCUR supports four confirmed VREF1/VREF2 pairings: 1.2 V / 1.8–5 V, 1.8 V / 2.5–5 V, 2.5 V / 3.3–5 V, and 3.3 V / 5 V. Translation requires VREF2 ≥ VREF1 + 0.6 V, and both supplies must remain within their respective absolute maximum ratings (–0.5 V to 7 V). The PCA9306DCUR does not support VREF1 > VREF2 or equal-supply translation without EN-controlled switching mode.
How does the EN pin affect bus operation in the PCA9306DCUR?
When EN is high, the PCA9306DCUR enables bidirectional conduction between SCL1/SDA1 and SCL2/SDA2 with <1.5-ns propagation delay. When EN is low, all I/O pins enter high-impedance state, fully isolating the two I²C domains - preventing bus contention, eliminating leakage paths, and enabling safe hot-plug insertion of remote boards. This behavior is lockup-free and verified per JESD78 Class II latch-up testing.
Can the PCA9306DCUR be used with 5-V I²C peripherals while powered by 1.8-V logic?
Yes - the PCA9306DCUR's 5-V-tolerant I/O ports (SCL2/SDA2) allow direct connection to 5-V SMBus or PMBus peripherals even when VREF1 = 1.8 V and VREF2 = 5 V. Its open-drain architecture preserves I²C bus electrical compliance, and its 3.5-Ω RON ensures minimal voltage drop during low-level assertion. No external clamping or series resistors are required for 5-V interface compatibility.
What is the maximum supported I²C bus speed for the PCA9306DCUR?
The PCA9306DCUR supports standard-mode (100 kHz) and fast-mode (400 kHz) I²C operation with timing margin, verified by ≤1.4 ns tPHL/tPLH under 50-pF load. It is not rated for fast-mode plus (1 MHz) due to cumulative propagation delay and bus capacitance constraints. For 1-MHz applications, TI recommends verifying total system capacitance (≤400 pF) and using the EN pin to isolate slower segments during high-speed bursts.
Does the PCA9306DCUR require external pull-up resistors on both sides of the I²C bus?
Yes - external pull-up resistors are mandatory on both SCL1/SDA1 (low-voltage side) and SCL2/SDA2 (high-voltage side) to establish valid logic-high levels. Pull-up values depend on bus speed and capacitance; TI recommends 2.2–10 kΩ for 400-kHz operation. VREF2 also requires a 200-kΩ resistor to VCC2 to provide bias current path and prevent LDO regulation loss - a requirement explicitly documented in the PCA9306DCUR datasheet Section 8.1.7.
PCA9306DCUR 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- Auto-Direction Sensing
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFSOP (0.091", 2.30mm Width)
PCA9306DCUR FAQ
1.How can I place an order for PCA9306DCUR through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9306DCUR 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 PCA9306DCUR reliable?
The price and inventory of PCA9306DCUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9306DCUR is usually 5 days.
3.What payment methods are accepted for PCA9306DCUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9306DCUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9306DCUR?
PCA9306DCUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9306DCUR 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 PCA9306DCUR?
For technical support, including PCA9306DCUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9306DCUR requirements.
6.How does Aetrix verify that PCA9306DCUR is sourced from the original manufacturer or authorized distributors?
All PCA9306DCUR 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 PCA9306DCUR meets industry standards.
7.What is the process for return or replacement of PCA9306DCUR?
All PCA9306DCUR units undergo pre-shipment inspection (PSI). If there is an issue with PCA9306DCUR, 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 PCA9306DCUR part is unused and in its original packaging.
Return procedure for PCA9306DCUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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