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Texas Instruments PCA9306DCTTG4
- Part No.:
- PCA9306DCTTG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
PCA9306DCTTG4.pdf
- Description:
- IC TRANSLATOR BIDIRECTIONAL SM8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
PCA9306DCTTG4 from Texas Instruments is a dual bidirectional I²C/SMBus voltage-level translator in an 8-pin SSOP package, supporting translation between 1.2 V and 5 V domains without direction control, with ≤1.5 ns max propagation delay, 3.5 Ω typical RON, and 5-V-tolerant I/O - used to isolate mixed-voltage I²C buses in server backplane interconnects.
For engineers reviewing the PCA9306DCTTG4 datasheet, PCA9306DCTTG4 pinout, PCA9306DCTTG4 application, or PCA9306DCTTG4 equivalent, key selection criteria include bidirectional level-shifting capability across 1.2–5 V rails, EN-controlled bus isolation for multi-speed I²C systems, open-drain compatibility with standard- and fast-mode (100/400 kHz) operation, and thermal performance in SSOP packaging.
Technical Context
The PCA9306DCTTG4 implements two independent NFET-based pass-gate channels (SCL1↔SCL2, SDA1↔SDA2), each controlled by a shared enable (EN) signal and biased by separate reference supplies (VREF1: 1.2–3.3 V; VREF2: 1.8–5.5 V). Its threshold-dependent conduction enables automatic bidirectional translation without direction logic.
When EN = high, both channels conduct with low RON (3.5–7 Ω depending on VEN), enabling signal coupling; when EN = low, all I/O pins enter high-impedance state, isolating buses while preventing lockup. Propagation delay asymmetry (tPHL/tPLH) is characterized separately for up/down translation and varies with load capacitance (15–50 pF) and supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF1 Range | 1.2 V to 3.3 V - sets low-side I/O voltage domain; must be ≥0.6 V below VREF2 for reliable translation |
| VREF2 Range | 1.8 V to 5.5 V - sets high-side I/O voltage domain; supports 3.3 V/5 V microcontrollers interfacing with 1.2 V/1.8 V sensors |
| Max Propagation Delay | ≤1.5 ns - ensures timing compliance with I²C fast-mode (400 kHz) and PMBus protocols under 50-pF load |
| RON (Typ) | 3.5 Ω at VEN = 4.5 V - minimizes voltage drop and signal distortion during current-sink operation (e.g., pull-up to VREF2) |
| ESD Rating (HBM) | ±2000 V - protects downstream 1.2 V/1.8 V logic from system-level ESD events on 5 V I²C lines |
| Operating Temp | –40 °C to +85 °C - qualified for industrial embedded and telecom equipment environments |
| Package | SSOP-8 (2.95 mm × 4 mm) - surface-mount footprint compatible with automated PCB assembly and thermal relief design |
Pinout & Package
The PCA9306DCTTG4 is housed in an 8-pin SSOP (Small Outline Package) with 0.65 mm pitch, measuring 2.95 mm × 4 mm. Pin numbering follows standard JEDEC top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Common return path for internal FET body diodes and bias networks; must be low-impedance connection to system ground plane |
| 2 VREF1 | Low-voltage reference supply | Bias source for SCL1/SDA1 I/O; defines logic thresholds and pass-gate gate drive for translation from VREF2 side |
| 3 SCL1 | Low-voltage I²C clock I/O | Open-drain bidirectional node tied to 1.2–3.3 V pull-up; connects to controller or peripheral on low-voltage bus |
| 4 SDA1 | Low-voltage I²C data I/O | Open-drain bidirectional node tied to same VREF1-domain pull-up; shares RON and delay characteristics with SCL1 |
| 5 SDA2 | High-voltage I²C data I/O | Open-drain bidirectional node tied to 1.8–5.5 V pull-up; electrically isolated from SDA1 when EN = low |
| 6 SCL2 | High-voltage I²C clock I/O | Open-drain bidirectional node tied to same VREF2-domain pull-up; matches SDA2 in voltage tolerance and switching behavior |
| 7 VREF2 | High-voltage reference supply | Bias source for SCL2/SDA2 I/O; must exceed VREF1 by ≥0.6 V to ensure FET turn-on and translation integrity |
| 8 EN | Enable control input | Active-high logic signal; drives internal pass-gate gates; high-impedance state when low prevents bus contention during hot-swap |
Key Features
| Feature | Design Value |
|---|---|
| No-direction-pin bidirectional translation | Eliminates external control logic and PCB routing for direction signals - simplifies layout and reduces BOM count in dual-bus systems |
| Flow-through pinout (SCL1–SCL2, SDA1–SDA2) | Enables straight trace routing across package - minimizes stub length and impedance discontinuity in high-speed I²C layouts |
| EN-controlled high-impedance isolation | Allows dynamic disconnection of slower (100 kHz) I²C segments during fast-mode (400 kHz) transactions - prevents timing violations and bus lockup |
| 5-V-tolerant I²C I/O ports | Permits direct interface with legacy 5 V controllers while protecting 1.2 V/1.8 V peripherals - avoids need for additional clamping or series resistors |
| Sub-2 ns propagation delay | Maintains setup/hold timing margins for 400 kHz I²C with up to 300 pF total bus capacitance - critical for multi-drop server management buses |
Applications
| Server Baseboard Management | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Isolating 3.3 V BMC (Baseboard Management Controller) I²C bus from 1.8 V temperature sensors and 5 V power rail monitors on a dense server motherboard. IC Role / Device Role / Timing Role: Bidirectional voltage translator and EN-gated bus switch enabling independent clock domains and hot-swap-safe sensor insertion. Use Value: Prevents 5 V transients from damaging 1.8 V sensors during power sequencing and allows BMC to communicate at 400 kHz while keeping legacy 100 kHz devices offline. | Use Scenario: Interfacing a 3.3 V ARM-based PLC CPU module with 2.5 V I/O expansion cards and 5 V legacy fieldbus transceivers via shared backplane connectors. IC Role / Device Role / Timing Role: Dual-channel level shifter providing galvanic separation between voltage domains and EN-controlled bus segmentation for firmware updates. Use Value: Enables mixed-voltage interoperability without redesigning pull-up networks and supports safe hot-plug of I/O modules without disrupting main control loop timing. |
| Telecom Router Control Plane | Automotive ADAS Camera Hub |
Use Scenario: Connecting a 1.2 V AI accelerator SoC to 3.3 V EEPROMs and 5 V fan controllers on a carrier board within a 1 RU telecom router. IC Role / Device Role / Timing Role: Voltage translator with EN pin used to gate communication during SoC boot sequence and thermal throttling events. Use Value: Ensures reliable I²C handshaking across three voltage tiers while avoiding bus contention during power-state transitions. | Use Scenario: Bridging 1.8 V MIPI I²C configuration bus from an image signal processor to 3.3 V camera module power management ICs and 5 V lens actuator drivers. IC Role / Device Role / Timing Role: Low-distortion bidirectional translator preserving signal integrity for auto-focus and white balance calibration sequences. Use Value: Maintains <1.5 ns skew between SCL/SDA paths - critical for sub-millisecond camera initialization timing budgets. |
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 repeater with built-in 10 kΩ pull-ups; requires external VCC for each side; higher quiescent current (25 µA vs. 10 µA) | Designed for long-reach I²C extension (>1 m traces); includes bus arbitration logic not present in PCA9306DCTTG4 | Choose TCA9617ADGKR when extending bus length beyond 30 cm or requiring automatic bus contention resolution |
| TXS0102DCUR | Auto-direction-sensing architecture; no EN pin; lower RON (3 Ω typ); supports 1.2–3.6 V translation only (no 5 V support) | Optimized for ultra-low-power portable devices; lacks EN-controlled isolation - unsuitable for multi-speed bus gating | Choose TXS0102DCUR for battery-powered wearables where 5 V tolerance is unnecessary and EN functionality is unused |
Compared with TCA9617ADGKR and TXS0102DCUR, the PCA9306DCTTG4 provides explicit EN control for deterministic bus isolation, full 5 V tolerance on high-side I/O, and SSOP packaging suited for industrial thermal cycling - making it optimal for server, telecom, and programmable logic applications requiring robust mixed-voltage coordination.
Availability
PCA9306DCTTG4 is available at Aetrix Electronics and suitable for server baseboard management, industrial PLC backplane interfaces, and telecom router control planes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for PCA9306DCTTG4 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 U.S.-based semiconductor company specializing in analog and embedded processing technologies, with leadership in interface, power management, and signal chain solutions.
The PCA9306DCTTG4 belongs to TI's I²C/SMBus level translation product line, designed specifically for robust, low-latency voltage domain bridging in multi-rail computing and communications infrastructure.
FAQ
What is the maximum supported I²C bus speed for PCA9306DCTTG4?
The PCA9306DCTTG4 supports standard-mode (100 kHz) and fast-mode (400 kHz) I²C operation. Its ≤1.5 ns maximum propagation delay ensures timing compliance at 400 kHz with typical bus capacitance (≤300 pF). It is not rated for fast-mode plus (1 MHz) due to cumulative delay and rise/fall time constraints specified in the datasheet's AC performance tables.
Can PCA9306DCTTG4 translate between 1.2 V and 5 V domains?
Yes, the PCA9306DCTTG4 explicitly supports translation from 1.2 V (VREF1) to 5 V (VREF2) domains, provided VREF2 ≥ VREF1 + 0.6 V and both supplies remain within their respective operating ranges (VREF1: 1.2–3.3 V; VREF2: 1.8–5.5 V). This capability is confirmed in Section 1 (Features) and Section 3 (Description) of the official datasheet SCPS113O.
Does PCA9306DCTTG4 require external pull-up resistors on both sides of the bus?
Yes, the PCA9306DCTTG4 requires external pull-up resistors on both SCL1/SDA1 (low-voltage side) and SCL2/SDA2 (high-voltage side), as its I/O ports are open-drain. Pull-up values must be selected per I²C specification (typically 1–10 kΩ) and adjusted for bus capacitance and speed; no internal pull-ups are integrated into the PCA9306DCTTG4.
How does the EN pin function in PCA9306DCTTG4?
When EN is high, the PCA9306DCTTG4 enables bidirectional conduction between SCL1↔SCL2 and SDA1↔SDA2. When EN is low, all four I/O pins enter high-impedance state, fully isolating the two buses - a feature used for hot-swap safety, multi-speed bus gating, and power sequencing. This behavior is verified in Sections 3, 4, and 8.1.3 of the datasheet.
Is PCA9306DCTTG4 pin-compatible with other packages of the PCA9306 family?
Yes, the PCA9306DCTTG4 (SSOP-8) shares identical pinout and electrical functionality with other PCA9306 variants including DCU (VSSOP-8), DQE (X2SON-8), and YZT (DSBGA-8), as confirmed in Figures 5-1 through 5-4 and Table 5-1 of the datasheet. All packages use the same 1–8 pin numbering and terminal assignments.
PCA9306DCTTG4 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)
PCA9306DCTTG4 FAQ
1.How can I place an order for PCA9306DCTTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9306DCTTG4 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 PCA9306DCTTG4 reliable?
The price and inventory of PCA9306DCTTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9306DCTTG4 is usually 5 days.
3.What payment methods are accepted for PCA9306DCTTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9306DCTTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9306DCTTG4?
PCA9306DCTTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9306DCTTG4 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 PCA9306DCTTG4?
For technical support, including PCA9306DCTTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9306DCTTG4 requirements.
6.How does Aetrix verify that PCA9306DCTTG4 is sourced from the original manufacturer or authorized distributors?
All PCA9306DCTTG4 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 PCA9306DCTTG4 meets industry standards.
7.What is the process for return or replacement of PCA9306DCTTG4?
All PCA9306DCTTG4 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9306DCTTG4, 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 PCA9306DCTTG4 part is unused and in its original packaging.
Return procedure for PCA9306DCTTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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