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Texas Instruments PCA9306DCTRG4
- Part No.:
- PCA9306DCTRG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
PCA9306DCTRG4.pdf
- Description:
- IC TRANSLATOR BIDIRECTIONAL SM8
- Quantity:
- Payment:
- Shipping:
Inventory:3,061
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Product details
Overview
PCA9306DCTRG4 from Texas Instruments is a dual bidirectional I²C/SMBus voltage-level translator IC operating between 1.2 V and 5.5 V domains, featuring 3.5 Ω typical RON, <1.5 ns max propagation delay, and 5-V-tolerant I/O - deployed in mixed-voltage server backplanes to isolate 400-kHz and 100-kHz I²C buses via EN control.
For engineers reviewing the PCA9306DCTRG4 datasheet, PCA9306DCTRG4 pinout, PCA9306DCTRG4 application, or PCA9306DCTRG4 equivalent, this page delivers verified electrical specs, validated translation voltage pairs (e.g., 1.8 V ↔ 3.3 V), EN-controlled bus isolation behavior, flow-through SSOP-8 pinout, and TI-confirmed alternatives for I²C level-shifting design-in.
Technical Context
The PCA9306DCTRG4 implements two independent NFET-based bidirectional pass-gate channels (SCL/SDA), each with ~0.6 V threshold voltage, enabling automatic directionless translation without external control logic. Its internal architecture supports both translation mode (VREF1 ≠ VREF2) and switch mode (VREF1 = VREF2), with distinct propagation delay asymmetry in translation mode depending on voltage differential.
EN pin assertion enables low-RON conduction (3.5–140 Ω, dependent on VEN and IO), while deassertion forces all I/O pins into high-impedance state with lockup-free isolation - critical for hot-plug remote board insertion and frequency-domain bus segmentation in telecom routers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF1 Range | 1.2 V to 3.3 V - sets low-side I/O 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 reference; enables 5-V-tolerant operation on SCL2/SDA2 |
| RON (Typ) | 3.5 Ω at EN = 4.5 V, IO = 64 mA - minimizes signal distortion and preserves rise/fall times on fast-mode (400 kHz) buses |
| Max Propagation Delay | 1.4 ns (tPHL, translating up, YZT/DQE, CL = 15 pF) - supports standard- and fast-mode I²C timing budgets |
| 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 switching equipment environments |
| Supply Current (IIH) | 5 µA max at VI = 5 V - enables low-quiescent-power bus isolation in always-on subsystems |
Pinout & Package
PCA9306DCTRG4 uses an 8-pin SSOP (DCT) package measuring 2.95 mm × 4 mm with flow-through pinout optimized for PCB trace routing. Pin functions are electrically identical across DCT, DCU, DQE, and YZT packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Active-high control: high = bidirectional conduction; low = full I/O isolation with high-Z state |
| GND | Ground reference | Common return path for both voltage domains; required for proper FET biasing and ESD protection |
| VREF1 | Low-voltage reference | Supplies gate bias for low-side NFETs; defines logic thresholds for SCL1/SDA1 (1.2–3.3 V) |
| VREF2 | High-voltage reference | Supplies gate bias for high-side NFETs; defines logic thresholds for SCL2/SDA2 (1.8–5.5 V) |
| SCL1 / SDA1 | Low-voltage I²C interface | Open-drain, 5-V-tolerant I/O ports - connect to 1.2/1.8/2.5/3.3-V controller or peripheral |
| SCL2 / SDA2 | High-voltage I²C interface | Open-drain, 5-V-tolerant I/O ports - connect to 2.5/3.3/5-V target devices or legacy SMBus peripherals |
Key Features
| Feature | Design Value |
|---|---|
| No-direction-pin translation | Automatic bidirectional signal flow eliminates GPIO overhead and timing-critical direction control logic |
| Voltage-pair flexibility | Valid combinations include 1.2 V ↔ 1.8 V, 1.8 V ↔ 3.3 V, 2.5 V ↔ 5 V, and 3.3 V ↔ 5 V - covers most mixed-voltage I²C topologies |
| EN-controlled bus segmentation | Enables dynamic disconnection of slower (100 kHz) I²C segments during fast-mode (400 kHz) communication - prevents timing violations |
| Flow-through SSOP-8 layout | Linear pin arrangement (GND–VREF1–SCL1–SDA1–SDA2–SCL2–VREF2–EN) simplifies 2-layer PCB routing with minimal crosstalk |
| Lockup-free isolation | Guaranteed high-Z state on all I/O when EN = low - avoids bus contention or latch-up during power sequencing or hot-swap events |
Applications
| Server Baseboard Management | Telecom Router Control Plane |
|---|---|
Use Scenario: Isolating 1.8-V BMC microcontroller I²C bus from 3.3-V EEPROMs, temperature sensors, and fan controllers on a multi-voltage server motherboard. IC Role / Device Role / Timing Role: Voltage-level translator and EN-gated bus switch enabling independent clock domain operation and hot-swap-safe firmware updates. Use Value: Prevents 3.3-V pull-ups from damaging 1.8-V BMC pins while allowing runtime reconfiguration of sensor topology without bus reset. | Use Scenario: Connecting 2.5-V line-card controllers to 5-V shelf management I²C backplane in modular telecom switches. IC Role / Device Role / Timing Role: Bidirectional level shifter with EN pin used to decouple legacy 100-kHz shelf monitoring bus from high-speed 400-kHz line-card configuration bus. Use Value: Eliminates need for separate bus controllers or software arbitration - hardware-enforced domain separation improves system reliability. |
| Industrial PLC I/O Module | PC Embedded Controller Hub |
Use Scenario: Interfacing 3.3-V ARM-based PLC CPU to 5-V analog I/O expander chips and legacy SMBus power monitors in harsh factory environments. IC Role / Device Role / Timing Role: Robust voltage translator with ±2000-V HBM ESD rating protecting sensitive MCU pins from field-induced transients. Use Value: Replaces discrete MOSFET solutions with guaranteed RON matching and symmetric propagation delay - reduces calibration drift in time-critical I/O reads. | Use Scenario: Bridging 1.2-V CPU core I²C debug interface to 3.3-V platform controller hub (PCH) and thermal diode sensors in thin-client PCs. IC Role / Device Role / Timing Role: Low-capacitance (4–12.5 pF) translator preserving signal integrity at 400 kHz over compact motherboard traces. Use Value: Enables direct connection without series resistors or slew-rate limiting - maintains I²C timing margins under worst-case trace loading. |
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 2-channel auto-directional translator with built-in 10-kΩ pull-ups; higher quiescent current (20 µA vs. 5 µA); supports 1.65–5.5-V range | Requires no external pull-ups; better for space-constrained designs but less flexible for custom bus termination | Select TCA9617ADGKR when minimizing BOM count and board area is prioritized over fine-grained pull-up tuning. |
| SN74AVC4T245RTER | Quad 2-bit bus transceiver with direction pin; CMOS-based (not open-drain); supports 1.2–3.6-V translation only; no 5-V tolerance | Not I²C/SMBus compliant due to push-pull outputs and mandatory direction control - requires protocol-aware firmware intervention | Choose SN74AVC4T245RTER only for non-I²C GPIO or UART level shifting where direction control is acceptable. |
Compared with TCA9617ADGKR and SN74AVC4T245RTER, PCA9306DCTRG4 uniquely combines true I²C compliance (open-drain, no direction pin), 5-V tolerance, and sub-1.5-ns propagation delay - making it the only option among the three qualified for mixed-voltage fast-mode I²C bus segmentation in telecom and server platforms.
Availability
PCA9306DCTRG4 is available at Aetrix Electronics and suitable for server baseboard management, telecom router control planes, industrial PLC I/O modules, and PC embedded controller hubs requiring stable component supply across extended temperature and mixed-voltage operating conditions.
Supply support for PCA9306DCTRG4 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 connectivity technologies, with leadership in industrial, automotive, and communications markets.
The PCA9306DCTRG4 belongs to TI's I²C/SMBus interface portfolio, engineered specifically for robust, low-latency voltage translation in multi-rail systems where bus isolation, ESD resilience, and timing predictability are critical.
FAQ
What voltage pairs are supported by the PCA9306DCTRG4 for reliable I²C translation?
The PCA9306DCTRG4 supports verified translation between 1.2 V and 1.8 V, 1.8 V and 2.5/3.3/5 V, 2.5 V and 3.3/5 V, and 3.3 V and 5 V - provided VREF2 ≥ VREF1 + 0.6 V and both supplies remain within their absolute maximum ratings (–0.5 V to 7 V). These pairings are confirmed in TI's SCPS113O datasheet Section 1 and Table 6.3.
Does the PCA9306DCTRG4 require external pull-up resistors on both sides of the I²C bus?
Yes, the PCA9306DCTRG4 requires external pull-up resistors on both SCL1/SDA1 and SCL2/SDA2 lines because its I/O ports are open-drain. Pull-up values must be selected per I²C bus speed and capacitance - e.g., 2.2 kΩ for 400 kHz on 200-pF buses. The device itself does not integrate pull-ups, unlike the TCA9617A.
Can the PCA9306DCTRG4 be used to isolate two I²C buses operating at different speeds?
Yes, the EN pin of the PCA9306DCTRG4 enables hardware-based bus isolation: asserting EN connects the buses for 100/400-kHz communication, while deasserting EN places all I/O pins in high-impedance state - preventing timing violations when a 400-kHz controller accesses devices on a slower 100-kHz segment, as documented in Section 8.1.3.
What is the maximum continuous current rating for the PCA9306DCTRG4 pass switch?
The PCA9306DCTRG4 has a maximum continuous channel current rating of 128 mA, as specified in Section 6.1 Absolute Maximum Ratings. However, recommended operating conditions limit pass current to 64 mA (Section 6.3) to ensure RON remains within 3.5–140 Ω and junction temperature stays below 125 °C under worst-case thermal conditions.
Is the PCA9306DCTRG4 compatible with SMBus, PMBus, and MDIO interfaces beyond I²C?
Yes, the PCA9306DCTRG4 is explicitly designed for SMBus and PMBus compatibility per Section 1 Features and Section 3 Description, and its open-drain, bidirectional, low-propagation-delay characteristics also support MDIO, low-speed SDIO, and GPIO translation - all confirmed in Section 2 Applications of the official datasheet.
PCA9306DCTRG4 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-LSSOP, 8-MSOP (0.110", 2.80mm Width)
PCA9306DCTRG4 FAQ
1.How can I place an order for PCA9306DCTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9306DCTRG4 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 PCA9306DCTRG4 reliable?
The price and inventory of PCA9306DCTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9306DCTRG4 is usually 5 days.
3.What payment methods are accepted for PCA9306DCTRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9306DCTRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9306DCTRG4?
PCA9306DCTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9306DCTRG4 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 PCA9306DCTRG4?
For technical support, including PCA9306DCTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9306DCTRG4 requirements.
6.How does Aetrix verify that PCA9306DCTRG4 is sourced from the original manufacturer or authorized distributors?
All PCA9306DCTRG4 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 PCA9306DCTRG4 meets industry standards.
7.What is the process for return or replacement of PCA9306DCTRG4?
All PCA9306DCTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9306DCTRG4, 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 PCA9306DCTRG4 part is unused and in its original packaging.
Return procedure for PCA9306DCTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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