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Texas Instruments PCA9306DCURG4
- Part No.:
- PCA9306DCURG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
PCA9306DCURG4.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:518
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Product details
Overview
PCA9306DCURG4 from Texas Instruments is a dual bidirectional I²C/SMBus voltage-level translator IC operating between 1.2 V and 5.5 V domains, featuring no-direction-pin architecture, <1.5 ns max propagation delay, 3.5 Ω typical RON, and 5-V-tolerant I/O ports - deployed in mixed-voltage server backplanes to isolate 100-kHz and 400-kHz I²C buses.
For engineers reviewing the PCA9306DCURG4 datasheet, PCA9306DCURG4 pinout, PCA9306DCURG4 application, or PCA9306DCURG4 equivalent, key selection criteria include bidirectional translation without direction control, EN-gated isolation, VREF1/VREF2 voltage pairing constraints (e.g., 1.8 V ↔ 3.3 V), open-drain I/O compatibility, and thermal performance in VSSOP-8 packaging.
Technical Context
The PCA9306DCURG4 implements two independent NFET-based pass-gate channels (SCL/SDA) with shared enable control and separate reference supplies (VREF1 for low-side, VREF2 for high-side). Its threshold-dependent conduction (Vth ≈ 0.6 V) enables automatic level shifting without external logic.
Operation requires VREF2 ≥ VREF1 + 0.6 V and supports translating up (low→high) and down (high→low) with asymmetric propagation delays - tPHL down is faster than tPHL up, and delay varies with VREF1/VREF2 bias and load capacitance (CL = 15–50 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF1 Range | 1.2 V to 3.3 V - sets low-voltage domain supply for SCL1/SDA1 I/O; must be ≥1.2 V for 1.2-V system compatibility |
| VREF2 Range | 1.8 V to 5.5 V - powers high-voltage side (SCL2/SDA2); enables 5-V tolerance and 3.3↔5-V translation |
| RON (typ) | 3.5 Ω at EN = 4.5 V, IO = 64 mA - ensures minimal signal distortion and <1.5 ns propagation delay for fast-mode I²C (400 kHz) |
| Propagation Delay | <1.5 ns max (CL = 15 pF) - supports timing-critical multi-controller I²C systems without clock stretching penalties |
| ESD Rating | ±2000 V HBM - protects downstream 1.2/1.8-V controllers from ESD events on 3.3/5-V bus segments |
| Operating Temp | –40°C to +85°C - qualified for industrial embedded and telecom switching equipment environments |
| Enable Logic | Active-high EN pin - provides lockup-free isolation; high-impedance I/O when EN = low, enabling dynamic bus segmentation |
Pinout & Package
PCA9306DCURG4 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 arrangement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Active-high control: enables bidirectional pass-gate conduction; forces high-Z state and lockup-free isolation when low |
| GND | Ground reference | Common return path for both voltage domains; required for proper FET biasing and ESD current shunting |
| VREF1 | Low-side reference | Supplies gate bias for low-voltage NFETs; defines logic thresholds for SCL1/SDA1 (1.2–3.3 V range) |
| VREF2 | High-side reference | Bias source for high-voltage NFETs; must exceed VREF1 by ≥0.6 V to ensure reliable conduction |
| SCL1 / SDA1 | Low-voltage I²C I/O | Open-drain pins for 1.2/1.8/2.5/3.3-V bus segment; internally connected via RON to corresponding SCL2/SDA2 |
| SCL2 / SDA2 | High-voltage I²C I/O | 5-V-tolerant open-drain pins for 2.5/3.3/5-V bus segment; withstands overvoltage during hot-swap events |
Key Features
| Feature | Design Value |
|---|---|
| No-direction-pin translation | Eliminates external control logic and routing complexity - automatic bidirectional signal flow based on voltage differential and FET threshold |
| Flow-through pinout | Minimizes trace stubs and impedance discontinuities in high-speed I²C routing - SCL1→SCL2 and SDA1→SDA2 aligned linearly |
| EN-gated bus isolation | Enables dynamic segmentation of mixed-speed I²C buses (e.g., disconnect 100-kHz sensor bus during 400-kHz controller transactions) |
| 5-V-tolerant I/O | Permits direct connection to legacy 5-V SMBus peripherals without external clamping - simplifies mixed-voltage system integration |
| Lockup-free disable mode | Guarantees safe high-impedance state on all I/O pins when EN = low - prevents bus contention and state-machine glitches during power sequencing |
Applications
| Server Baseboard Management | Telecom Router Backplane |
|---|---|
Use Scenario: Isolating 100-kHz temperature sensors from 400-kHz BMC processor I²C bus during high-priority firmware updates. IC Role / Device Role / Timing Role: Bidirectional voltage translator and EN-controlled bus switch - separates timing domains while maintaining protocol transparency. Use Value: Prevents slow peripherals from limiting system-level I²C throughput; enables concurrent bus access without arbitration conflicts. | Use Scenario: Interfacing 1.8-V FPGA management I/O with 3.3-V PMBus power controllers across a hot-pluggable line card interface. IC Role / Device Role / Timing Role: Voltage-level translator with 5-V-tolerant inputs - bridges disparate supply domains while surviving insertion transients. Use Value: Eliminates need for discrete MOSFET translators and pull-up resistor networks - reduces BOM count and layout area by >40%. |
| Industrial PLC I/O Module | Embedded PC Peripheral Hub |
Use Scenario: Connecting 2.5-V microcontroller GPIOs to 5-V legacy I²C EEPROMs and real-time clocks in factory automation hardware. IC Role / Device Role / Timing Role: Dual-channel bidirectional level shifter - maintains I²C timing integrity across 2.5↔5-V translation with <1.5 ns delay. Use Value: Enables drop-in replacement of aging 3.3-V-only controllers without redesigning power distribution or bus termination. | Use Scenario: Enabling USB-to-I²C bridge ICs (3.3-V) to communicate with 1.2-V DDR memory SPD EEPROMs in compact desktop motherboards. IC Role / Device Role / Timing Role: Low-voltage domain translator with 1.2-V VREF1 support - extends compatibility to next-generation ultra-low-power memory interfaces. Use Value: Supports JEDEC SPD4 specification compliance without additional level-shifting circuitry - reduces signal path skew and jitter. |
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 | Integrated auto-direction sensing; higher RON (6 Ω typ); supports 1-MHz Fast Mode Plus | Requires no EN control but lacks EN-gated isolation; better for high-speed point-to-point links | Select when automatic direction detection is preferred over manual EN control and 1-MHz operation is required |
| TXS0102DQMR | Data-rate-limited (10–50 Mbps); no VREF2 pin - uses single-supply translation; lower ESD rating (1500 V HBM) | Optimized for GPIO/UART, not I²C; unsuitable for SMBus/PMBus due to lack of bus timing compliance | Select only for non-I²C digital signal translation where bus protocol timing and ESD robustness are secondary |
Compared with TCA9617ADGKR and TXS0102DQMR, the PCA9306DCURG4 uniquely balances EN-controllable isolation, sub-1.5 ns delay, and full I²C/SMBus electrical compliance - making it the only choice for mixed-speed bus segmentation in servers and telecom infrastructure.
Availability
PCA9306DCURG4 is available at Aetrix Electronics and suitable for server baseboard management, telecom router backplanes, and industrial PLC I/O modules requiring stable component supply across extended product lifecycles.
Supply support for PCA9306DCURG4 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 PCA9306DCURG4 belongs to TI's precision I²C/SMBus level translation product line, engineered specifically for robust, low-latency voltage domain bridging in mission-critical infrastructure equipment.
FAQ
What voltage combinations are supported by the PCA9306DCURG4?
The PCA9306DCURG4 supports translation between VREF1 = 1.2 V and VREF2 = 1.8/2.5/3.3/5 V; VREF1 = 1.8 V and VREF2 = 2.5/3.3/5 V; VREF1 = 2.5 V and VREF2 = 3.3/5 V; or VREF1 = 3.3 V and VREF2 = 5 V. VREF2 must always exceed VREF1 by at least 0.6 V per datasheet Section 6.3.
Does the PCA9306DCURG4 require external pull-up resistors on both sides of the I²C bus?
Yes, the PCA9306DCURG4 requires external pull-up resistors on both SCL1/SDA1 and SCL2/SDA2 lines. It does not integrate pull-ups. Resistor values must be selected per bus speed and total capacitance (≤400 pF combined), with separate optimization for each voltage domain.
Can the PCA9306DCURG4 be used to isolate two I²C buses operating at different speeds?
Yes, the PCA9306DCURG4 can isolate buses at different speeds using its EN pin. For example, disabling EN disconnects a 100-kHz sensor bus during 400-kHz communication with a high-speed controller - preventing timing violations and bus lockups.
What is the maximum continuous current rating for the PCA9306DCURG4 pass switches?
The PCA9306DCURG4 has a maximum continuous channel current rating of 128 mA per channel (SCL or SDA), as specified in Absolute Maximum Ratings Table 6.1. Operating above this risks permanent damage to the internal NFETs.
Is the PCA9306DCURG4 pin-compatible with other packages of the PCA9306 family?
No - the PCA9306DCURG4 (VSSOP-8) shares identical pin functions and numbering with PCA9306DCTRG4 (SSOP-8), PCA9306DQERG4 (X2SON-8), and PCA9306YZTRG4 (DSBGA-8), but physical package dimensions, thermal characteristics, and PCB footprints differ significantly and are not interchangeable without layout revision.
PCA9306DCURG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
PCA9306DCURG4 FAQ
1.How can I place an order for PCA9306DCURG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9306DCURG4 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 PCA9306DCURG4 reliable?
The price and inventory of PCA9306DCURG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9306DCURG4 is usually 5 days.
3.What payment methods are accepted for PCA9306DCURG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9306DCURG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9306DCURG4?
PCA9306DCURG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9306DCURG4 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 PCA9306DCURG4?
For technical support, including PCA9306DCURG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9306DCURG4 requirements.
6.How does Aetrix verify that PCA9306DCURG4 is sourced from the original manufacturer or authorized distributors?
All PCA9306DCURG4 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 PCA9306DCURG4 meets industry standards.
7.What is the process for return or replacement of PCA9306DCURG4?
All PCA9306DCURG4 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9306DCURG4, 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 PCA9306DCURG4 part is unused and in its original packaging.
Return procedure for PCA9306DCURG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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