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Texas Instruments PCA9306YZTR
- Part No.:
- PCA9306YZTR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
PCA9306YZTR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:5,240
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Product details
Overview
PCA9306YZTR from Texas Instruments is a dual bidirectional I²C/SMBus voltage-level translator IC with enable control, supporting 1.2-V to 3.3-V VREF1 and 1.8-V to 5.5-V VREF2 rails, <1.5-ns max propagation delay, 3.5-Ω typical RON, and 5-V-tolerant I/O - deployed in mixed-voltage server backplanes and industrial I²C subsystems.
For engineers reviewing the PCA9306YZTR datasheet, PCA9306YZTR pinout, PCA9306YZTR application, or PCA9306YZTR equivalent, key selection considerations include bidirectional translation without direction pin, EN-controlled isolation for bus frequency segregation (e.g., 100-kHz vs. 400-kHz), open-drain I²C port compatibility, and DSBGA-8 package thermal performance (RθJA = 125.5°C/W).
Technical Context
The PCA9306YZTR implements two matched NFET pass switches per channel (SCL/SDA), each biased by VREF1 and VREF2 to enable automatic bidirectional level shifting. Its gate control architecture eliminates external direction logic while maintaining sub-1.5-ns propagation delay across translating up (low-to-high) and down (high-to-low) paths under 50-pF load.
EN input enables lockup-free high-impedance isolation between ports, allowing dynamic bus segmentation - critical for isolating slower peripherals during fast-mode I²C bursts or hot-plugging remote boards onto active backplanes without SCL glitches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF1 Range | 1.2 V to 3.3 V - sets low-side I/O voltage reference; must be ≥0.6 V below VREF2 for valid translation |
| VREF2 Range | 1.8 V to 5.5 V - sets high-side I/O voltage reference; supports 5-V-tolerant operation |
| RON (Typ) | 3.5 Ω at EN = 4.5 V - ensures minimal signal distortion and <1.5-ns propagation delay with ≤50-pF bus loads |
| Max Propagation Delay | 1.4 ns (tPHL, translating up, YZT package, CL = 15 pF) - enables reliable 400-kHz I²C timing margins |
| ESD Rating (HBM) | ±2000 V - protects downstream 1.2-V/1.8-V controllers from system-level ESD events |
| Operating Temp | –40°C to +85°C - qualified for industrial embedded and telecom infrastructure environments |
| Package | DSBGA-8 (1.98 mm × 0.98 mm) - ultra-compact footprint with 125.5°C/W junction-to-ambient thermal resistance |
Pinout & Package
PCA9306YZTR uses an 8-pin DSBGA (YZT) package with 0.4-mm pitch, optimized for space-constrained PCB layouts and thermal performance (RθJA = 125.5°C/W). Flow-through pinout minimizes trace crossovers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (A2) | Enable control input | Active-high logic; drives internal FET gates - low state places SCL1/SDA1/SCL2/SDA2 in high-Z isolation |
| GND (A1) | Ground reference | Common return path for both voltage domains; required for proper FET biasing and ESD current shunting |
| VREF1 (B1) | Low-voltage reference supply | Bias source for SCL1/SDA1 ports; defines 1.2–3.3-V operating range and threshold tracking |
| VREF2 (B2) | High-voltage reference supply | Bias source for SCL2/SDA2 ports; enables 5-V-tolerant operation and sets upper translation limit |
| SCL1 (C1) | Low-side serial clock I/O | Open-drain, bidirectional; connects to 1.2–3.3-V controller or peripheral clock line |
| SCL2 (C2) | High-side serial clock I/O | Open-drain, bidirectional; interfaces to 1.8–5.5-V bus segment with 5-V tolerance |
| SDA1 (D1) | Low-side serial data I/O | Open-drain, bidirectional; shares same electrical characteristics as SCL1 for matched timing |
| SDA2 (D2) | High-side serial data I/O | Open-drain, bidirectional; matches SCL2 timing and voltage tolerance for full bus integrity |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional translation without direction pin | Automatic FET conduction based on relative VREF1/VREF2 and signal edge polarity - eliminates GPIO overhead and routing complexity |
| Sub-1.5-ns propagation delay | Ensures setup/hold timing compliance for 400-kHz I²C even with 50-pF total bus capacitance across both sides |
| EN-controlled high-impedance isolation | Enables dynamic bus segmentation - e.g., disconnecting 100-kHz peripherals during 400-kHz master transactions |
| 5-V-tolerant I²C I/O ports | Allows direct connection to legacy 5-V SMBus peripherals without external clamping or resistive dividers |
| Latch-up immunity (>100 mA) | Guarantees robust operation in noisy industrial environments with transient coupling or ground bounce |
Applications
| Server Backplane Interfacing | Industrial Sensor Hub Integration |
|---|---|
Use Scenario: Connecting 1.8-V baseboard management controller (BMC) to 3.3-V or 5-V hot-swap power modules and FRU EEPROMs across a dense backplane. IC Role / Device Role / Timing Role: Voltage-level translator and EN-gated bus isolator - synchronizes mixed-voltage I²C domains while preventing cross-talk during module insertion. Use Value: Eliminates need for discrete MOSFET translators and pull-up resistor networks; enables safe hot-plug via EN-controlled isolation before power sequencing completes. | Use Scenario: Aggregating 1.2-V MEMS sensors and 3.3-V analog front-ends into a single 400-kHz I²C sensor fusion node within programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: Dual-channel bidirectional level shifter - maintains signal integrity across asymmetric voltage domains while preserving I²C arbitration and clock stretching behavior. Use Value: Reduces BOM count versus discrete solutions; RON matching ensures <0.3-ns skew between SDA/SCL paths, preventing false ACK/NACK detection. |
| Telecom Router Control Plane | Embedded PC Peripheral Bridging |
Use Scenario: Isolating 1.8-V FPGA-based control plane from 5-V PMBus-compliant DC-DC controllers and thermal monitors in carrier-grade routers. IC Role / Device Role / Timing Role: EN-enabled bus switch - segments control and power domains to prevent 100-kHz PMBus telemetry bursts from disrupting 400-kHz FPGA configuration reads. Use Value: Enables deterministic bus arbitration; <1.5-ns delay preserves timing margins for multi-master I²C arbitration windows. | Use Scenario: Bridging 3.3-V SoC I²C master to 5-V legacy GPIO expanders, fan controllers, and SMBus battery gauges in compact embedded PCs. IC Role / Device Role / Timing Role: Dual-channel voltage translator - translates SDA/SCL signals bidirectionally while maintaining open-drain drive strength and rise/fall time symmetry. Use Value: Supports full 400-kHz operation without external pull-up tuning; 5-V tolerance avoids level-shifter cascading for legacy peripherals. |
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 |
|---|---|---|---|
| TCA9617A | Integrated auto-direction sensing; higher RON (6 Ω typ); requires VCC1/VCC2 ≥ 1.65 V | Supports 1-MHz I²C; lacks EN pin - no dynamic isolation capability | Choose TCA9617A when auto-direction is preferred and EN-controlled segmentation is unnecessary |
| TXS0102 | Lower VREF1 min (1.2 V); no VREF2 pin - uses single-supply topology; 10-Ω RON typ | Optimized for 1.8-V ↔ 3.3-V only; not rated for 5-V-tolerant operation | Choose TXS0102 for cost-sensitive 1.8/3.3-V-only systems where 5-V compatibility is irrelevant |
Compared with PCA9306YZTR, TCA9617A offers higher-speed support but sacrifices EN-based isolation, while TXS0102 reduces cost and size for narrow-voltage applications but cannot interface with 5-V SMBus devices - PCA9306YZTR remains optimal for mixed-domain systems requiring both wide voltage range and dynamic bus control.
Availability
PCA9306YZTR is available at Aetrix Electronics and suitable for server backplane interfacing, industrial sensor hub integration, telecom router control plane segmentation, and embedded PC peripheral bridging requiring stable component supply and long-term industrial lifecycle support.
Supply support for PCA9306YZTR 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 technologies, with decades of leadership in interface and power management ICs.
The PCA9306YZTR belongs to TI's precision I²C/SMBus level translation product line, engineered specifically for robust mixed-voltage system interconnect in servers, industrial automation, and telecom infrastructure.
FAQ
What voltage combinations does the PCA9306YZTR support for bidirectional translation?
The PCA9306YZTR supports translation between 1.2-V VREF1 and 1.8-/2.5-/3.3-/5-V VREF2; 1.8-V VREF1 and 2.5-/3.3-/5-V VREF2; 2.5-V VREF1 and 3.3-/5-V VREF2; and 3.3-V VREF1 and 5-V VREF2. Valid operation requires VREF2 ≥ VREF1 + 0.6 V, per TI SCPS113O Section 6.3.
How does the EN pin function in the PCA9306YZTR, and what happens when it is driven low?
When EN is low, the PCA9306YZTR disables both SCL and SDA pass switches, placing SCL1, SDA1, SCL2, and SDA2 in high-impedance states - enabling complete electrical isolation between the two I²C domains. This lockup-free behavior prevents bus contention during hot-plug events or frequency-mismatched communication, as confirmed in Section 8.1.3 of the PCA9306YZTR datasheet.
Can the PCA9306YZTR be used to isolate a 100-kHz I²C bus from a 400-kHz I²C bus, and how is this implemented?
Yes - the PCA9306YZTR can isolate buses of differing speeds using its EN pin. When EN is low, the 100-kHz peripheral side is disconnected, allowing the 400-kHz master to communicate unimpeded on the main bus. Re-enabling EN restores bidirectional translation. This technique is explicitly documented in Section 8.1.3 and Figure 8-3 of the PCA9306YZTR datasheet.
What is the maximum continuous channel current rating for the PCA9306YZTR, and why is it critical in layout design?
The PCA9306YZTR has a maximum continuous channel current rating of 128 mA (Section 6.1 Absolute Maximum Ratings). Exceeding this - for example, by tying VREF2 directly to VCC2 without a series resistor - risks FET damage due to uncontrolled current flow when VREF2 > VREF1 + Vth. TI recommends a 200-kΩ resistor between VREF2 and VCC2, as shown in Figure 8-1 of the PCA9306YZTR datasheet.
Does the PCA9306YZTR require external pull-up resistors on both sides of the I²C bus, and how does RON affect their selection?
Yes - external pull-up resistors are required on both SCL1/SDA1 and SCL2/SDA2 sides, as the PCA9306YZTR provides no internal pull-ups. Its 3.5-Ω typical RON minimizes voltage drop, allowing standard I²C pull-up values (e.g., 2.2 kΩ @ 3.3 V) to maintain rise times compatible with 400-kHz operation - verified in Section 6.5 and Figure 6-1 of the PCA9306YZTR datasheet.
PCA9306YZTR 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:
- -
- Qualification:
- -
- Features:
- Auto-Direction Sensing
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UFBGA, DSBGA
PCA9306YZTR FAQ
1.How can I place an order for PCA9306YZTR through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9306YZTR 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 PCA9306YZTR reliable?
The price and inventory of PCA9306YZTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9306YZTR is usually 5 days.
3.What payment methods are accepted for PCA9306YZTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9306YZTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9306YZTR?
PCA9306YZTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9306YZTR 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 PCA9306YZTR?
For technical support, including PCA9306YZTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9306YZTR requirements.
6.How does Aetrix verify that PCA9306YZTR is sourced from the original manufacturer or authorized distributors?
All PCA9306YZTR 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 PCA9306YZTR meets industry standards.
7.What is the process for return or replacement of PCA9306YZTR?
All PCA9306YZTR units undergo pre-shipment inspection (PSI). If there is an issue with PCA9306YZTR, 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 PCA9306YZTR part is unused and in its original packaging.
Return procedure for PCA9306YZTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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