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Texas Instruments TCA39306DCURQ1
- Part No.:
- TCA39306DCURQ1
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
TCA39306DCURQ1.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TCA39306DCURQ1 from Texas Instruments is an AEC-Q100 qualified dual bidirectional I³C/I²C/SMBus voltage-level translator with enable control, supporting 0.85–5 V translation across two isolated domains (VREF1 = 0.9–3.3 V, VREF2 = 1.8–5.5 V), 12.5 MHz I³C operation, and <5 Ω typical RON - deployed in automotive infotainment and ADAS sensor hubs for mixed-voltage bus isolation.
For engineers reviewing the TCA39306DCURQ1 datasheet, TCA39306DCURQ1 pinout, TCA39306DCURQ1 application, or TCA39306DCURQ1 equivalent, key selection criteria include bidirectional translation without direction pin, EN-controlled bus isolation, I³C compatibility up to 12.5 MHz, 5-V-tolerant I/O, and AEC-Q100 Grade 1 qualification for under-hood use.
Technical Context
The TCA39306DCURQ1 implements a dual-channel NFET-based pass-gate architecture with shared enable control, enabling simultaneous bidirectional level translation between SCL1/SDA1 and SCL2/SDA2 without direction logic. Its threshold voltage (VTH ≈ 0.6 V) defines minimum VREF2–VREF1 differential (≥0.6 V) for reliable low-level propagation.
It supports three operational modes: voltage translation (VREF1 ≠ VREF2), bus isolation (EN = Low → high-impedance state), and switch mode (VREF1 = VREF2). Propagation delay asymmetry (e.g., translating down faster than up) is inherent to its gate-driven FET topology and scales with VREF differential and load capacitance (15–50 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF1 Range | 0.85 V to 3.3 V - sets low-side I/O voltage domain; 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 domain; enables 5-V-tolerant operation on SCL2/SDA2 |
| RON (Typ) | 3.5–7 Ω - ensures minimal signal distortion and <1 ns propagation delay at 15 pF load |
| I³C Support | 12.5 MHz - meets MIPI I³C Basic v1.1 timing for high-speed sensor communication |
| ESD Rating | ±2000 V HBM - exceeds AEC-Q100 stress requirements for automotive assembly environments |
| Operating Temp | –40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for engine bay and cabin electronics |
| Enable Logic | EN ≥ 1.5 V - enables bidirectional conduction; EN = 0 V forces high-impedance isolation between ports |
Pinout & Package
Package: 8-pin VSSOP (DCU), 2.0 mm × 3.1 mm body, 0.65 mm pitch, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 8) | Enable input | Active-high control: EN ≥ 1.5 V enables bidirectional translation; EN = 0 V isolates ports into high-Z |
| GND (Pin 1) | Ground reference | Common return path for both VREF domains; must be low-inductance connection to avoid noise coupling |
| VREF1 (Pin 2) | Low-voltage supply reference | Sets SCL1/SDA1 I/O voltage level; supplies internal bias network; requires external pull-down if sourced by LDO |
| SCL1 (Pin 3) | Low-side serial clock I/O | Open-drain I²C/I³C clock line for 0.85–3.3 V domain; bidirectionally translated to SCL2 when EN active |
| SDA1 (Pin 4) | Low-side serial data I/O | Open-drain I²C/I³C data line for 0.85–3.3 V domain; shares same RON and timing as SCL1 |
| SDA2 (Pin 5) | High-side serial data I/O | Open-drain I²C/I³C data line for 1.8–5.5 V domain; 5-V tolerant; electrically isolated from SDA1 when EN = Low |
| SCL2 (Pin 6) | High-side serial clock I/O | Open-drain I²C/I³C clock line for 1.8–5.5 V domain; matches SDA2 timing and voltage tolerance |
| VREF2 (Pin 7) | High-voltage supply reference | Sets SCL2/SDA2 I/O voltage level; must connect via 200 kΩ resistor to VCC2 to limit bias current and prevent FET overstress |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional translation without direction pin | Eliminates GPIO overhead and timing-critical direction control logic in I²C/I³C systems |
| EN-controlled bus isolation | Enables dynamic segmentation of mixed-speed I²C buses (e.g., 400 kHz vs. 1 MHz) without hardware rework |
| Flow-through pinout (SCL1→SCL2, SDA1→SDA2) | Minimizes PCB trace length and crosstalk; supports straight routing across board layers |
| 12.5 MHz I³C compatibility | Supports MIPI I³C Basic v1.1 sensor interfaces in next-gen automotive camera and radar modules |
| AEC-Q100 Grade 1 qualification | Validated for continuous operation at 125 °C ambient - suitable for powertrain and ADAS ECU integration |
Applications
| Automotive Camera Hub | ADAS Sensor Fusion Module |
|---|---|
|
Use Scenario: Interfacing 1.8-V MIPI I³C image sensors to a 3.3-V SoC host processor over shared I²C control bus. IC Role / Device Role / Timing Role: Voltage-level translator and bus isolator - translates SCL/SDA signals bidirectionally while enabling/disabling sensor access during frame sync. Use Value: Prevents 3.3-V host from damaging 1.8-V sensors; EN pin allows hot-plug-safe sensor initialization without bus contention. |
Use Scenario: Connecting multiple 2.5-V ultrasonic parking sensors and 3.3-V inertial measurement units (IMUs) to a central 5-V microcontroller. IC Role / Device Role / Timing Role: Dual-domain translator - bridges 2.5-V and 3.3-V peripherals to 5-V controller while maintaining I²C timing integrity. Use Value: Enables single-controller management of heterogeneous sensor voltages without level-shifter arrays or discrete FETs. |
| Infotainment Display Interface | Body Control Module (BCM) |
|
Use Scenario: Isolating legacy 3.3-V display driver ICs from a new 1.2-V application processor I²C bus in digital instrument clusters. IC Role / Device Role / Timing Role: Voltage translator with enable gating - provides clean 1.2-V ↔ 3.3-V translation and prevents back-powering during processor sleep. Use Value: Eliminates need for external pull-up resistors on both sides; EN pin synchronizes with processor power states for zero-leakage standby. |
Use Scenario: Integrating 5-V LIN transceivers and 3.3-V CAN FD controllers onto a shared diagnostic I²C bus in gateway ECUs. IC Role / Device Role / Timing Role: Mixed-voltage bus translator - enables diagnostics over I²C while preserving 5-V tolerance for LIN side and 3.3-V compatibility for CAN FD side. Use Value: Reduces BOM count by replacing discrete voltage translators; withstands automotive load-dump transients due to 5-V I/O rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9306DCURQ1 | Lacks I³C support; max 1 MHz I²C; no AEC-Q100 qualification; RON > 10 Ω typical | Restricted to legacy I²C-only automotive modules; unsuitable for MIPI I³C sensor stacks | Select only for cost-sensitive non-safety I²C bridges where 12.5 MHz speed and functional safety documentation are unnecessary |
| SN74AVC4T245RTER | Direction-controlled (DIR pin required); CMOS push-pull outputs; no open-drain I²C compliance; not AEC-Q100 qualified | Requires additional GPIO and level-shifting logic; incompatible with I²C pull-up topologies | Use only for general-purpose GPIO/data-bus translation - not for I²C, SMBus, or I³C protocols |
Compared with PCA9306DCURQ1 and SN74AVC4T245RTER, the TCA39306DCURQ1 uniquely delivers I³C-ready bidirectional translation with AEC-Q100 qualification, EN-based isolation, and sub-7 Ω RON, making it the sole choice for modern automotive sensor hubs requiring protocol flexibility and functional safety support.
Availability
TCA39306DCURQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS sensor fusion modules, and body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TCA39306DCURQ1 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 automotive ICs, with decades of automotive qualification expertise and functional safety documentation infrastructure.
The TCA39306DCURQ1 belongs to TI's automotive-grade interface portfolio, designed specifically to solve mixed-voltage I²C/I³C/SMBus interoperability challenges in safety-critical vehicle subsystems.
FAQ
What is the minimum voltage differential required between VREF1 and VREF2 for reliable operation of the TCA39306DCURQ1?
The TCA39306DCURQ1 requires VREF2 ≥ VREF1 + 0.6 V to ensure proper low-level signal translation, based on its internal NFET threshold voltage (VTH ≈ 0.6 V at 25 °C). For example, with VREF1 = 1.2 V, VREF2 must be at least 1.8 V. This constraint is explicitly defined in Section 5.3 Recommended Operating Conditions of the TCA39306DCURQ1 datasheet and applies across the full –40 °C to +125 °C operating range.
Can the TCA39306DCURQ1 be used to isolate I²C buses during hot-plug events, and how is this implemented?
Yes - the TCA39306DCURQ1 supports hot-plug isolation via its EN pin. During board insertion, EN is held low to place SCL1/SDA1 and SCL2/SDA2 in high-impedance state, preventing bus glitches or unintended SCL pulses. Once the remote board is powered and both buses are idle, EN is asserted high to enable translation. This method is validated in TI Application Report SCPS239B Section 7.1.4 for backplane connectivity.
Does the TCA39306DCURQ1 support MIPI I³C Basic v1.1, and what is its maximum supported frequency?
Yes, the TCA39306DCURQ1 is explicitly specified for I³C compatibility up to 12.5 MHz in its Features section and Section 7.1 Overview. This meets the 12.5 MHz SDR (Single Data Rate) clock requirement of MIPI I³C Basic v1.1 for sensor control and configuration, confirmed by TI's characterization data in Section 5.8 Switching Characteristics.
What is the purpose of the 200-kΩ resistor between VREF2 and EN in the TCA39306DCURQ1 reference design?
The 200-kΩ resistor establishes a bias network that sets EN voltage to VREF1 + VTH (≈ VREF1 + 0.6 V), ensuring reliable turn-on of the internal pass FETs. It limits bias current to ~4 µA (e.g., at VREF2 = 3.3 V, VREF1 = 1.8 V), preventing overstress of the FET channel. Omitting this resistor risks excessive current flow and potential device failure, as detailed in Section 7.1.2 "Correct Device Set Up" of the TCA39306DCURQ1 datasheet.
Is the TCA39306DCURQ1 compatible with Fast Mode Plus (Fm+) I²C (1 MHz) and SMBus 3.0 specifications?
Yes - the TCA39306DCURQ1 is explicitly stated as "Fast-mode plus I²C and SMBus compatible" in its Features list and supports 1 MHz operation with ≤550 pF total bus capacitance. Its low RON (<7 Ω) and sub-5 ns propagation delays (Section 5.8) meet Fm+ timing budgets, and its 5-V-tolerant I/O satisfies SMBus 3.0 voltage requirements for VH and VOH.
TCA39306DCURQ1 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:
- 0.85 V ~ 5.5 V
- Voltage - VCCB:
- 1.65 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Open Drain, Push-Pull
- Data Rate:
- 12.5MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFSOP (0.091", 2.30mm Width)
TCA39306DCURQ1 FAQ
1.How can I place an order for TCA39306DCURQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TCA39306DCURQ1 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 TCA39306DCURQ1 reliable?
The price and inventory of TCA39306DCURQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TCA39306DCURQ1 is usually 5 days.
3.What payment methods are accepted for TCA39306DCURQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TCA39306DCURQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TCA39306DCURQ1?
TCA39306DCURQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TCA39306DCURQ1 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 TCA39306DCURQ1?
For technical support, including TCA39306DCURQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TCA39306DCURQ1 requirements.
6.How does Aetrix verify that TCA39306DCURQ1 is sourced from the original manufacturer or authorized distributors?
All TCA39306DCURQ1 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 TCA39306DCURQ1 meets industry standards.
7.What is the process for return or replacement of TCA39306DCURQ1?
All TCA39306DCURQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TCA39306DCURQ1, 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 TCA39306DCURQ1 part is unused and in its original packaging.
Return procedure for TCA39306DCURQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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