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Texas Instruments TCA9406DCUR
- Part No.:
- TCA9406DCUR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
TCA9406DCUR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,420
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Product details
Overview
TCA9406 from Texas Instruments is a 2-bit bidirectional I²C/SMBus voltage-level translator with auto-direction sensing, supporting 1.65–3.6 V on A-port and 2.3–5.5 V on B-port, integrated 10-kΩ pullups, 8-kV HBM ESD on B-port, and operation up to 2 Mbps in open-drain mode - used to interface 1.8-V microcontrollers with 3.3-V or 5-V I²C peripherals in embedded sensor hubs.
For engineers reviewing the TCA9406 datasheet, TCA9406 pinout, TCA9406 application, or TCA9406 equivalent, key selection criteria include VCCA/VCCB voltage compatibility, OE control logic referenced to VCCA, high-impedance disable state, and timing performance under push-pull vs. open-drain drive conditions.
Technical Context
The TCA9406 uses pass-gate architecture with edge-rate accelerators (one-shots) to enable bidirectional translation without direction pins. Its dual-supply design enforces VCCA ≤ VCCB and supports independent power sequencing - either supply may ramp first without latch-up or functional disruption.
It operates in two primary modes: open-drain (I²C/SMBus compliant, up to 2 Mbps) and push-pull (up to 24 Mbps), with internal 10-kΩ pullups active only when enabled. The OE input, referenced to VCCA but 5.5-V tolerant, places all I/Os into high-impedance when low, reducing quiescent current to ≤2 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| A-port voltage range | 1.65 V to 3.6 V - enables direct interface with 1.8-V and 3.3-V logic domains |
| B-port voltage range | 2.3 V to 5.5 V - supports legacy 2.5-V, 3.3-V, and 5-V I²C buses |
| Max data rate (open-drain) | 2 Mbps - compatible with I²C Fast-mode Plus (1 MHz SCL) and SMBus 3.0 |
| ESD rating (B-port HBM) | ±8 kV - meets industrial I/O robustness requirements per JEDEC JS-001 |
| Propagation delay (tPHL/tPLH) | 1.3–10 ns - ensures timing compliance across VCCA/VCCB combinations and drive types |
| OE input reference | VCCA-referenced, 5.5-V tolerant - allows direct tie-to-VCCA or GPIO control without level shifting |
| Quiescent current (Ioff) | ≤2 µA when VCCA = 0 V or OE = low - enables zero-power isolation in battery-backed systems |
Pinout & Package
Package: SM8 (8-pin small-outline package), body size 2.95 mm × 2.80 mm, moisture sensitivity level MSL-1, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SDA_B | I/O (B-port) | B-side data line, referenced to VCCB; bidirectionally translates SDA signals between A and B domains |
| 2: GND | Ground | Common reference for both ports; must be connected to system ground plane for noise immunity |
| 3: VCCA | Power (A-port) | Supplies A-port logic and OE input; sets low-voltage domain (1.65–3.6 V); must be ≤ VCCB |
| 4: SDA_A | I/O (A-port) | A-side data line, referenced to VCCA; connects to 1.8-V/3.3-V controller SDA pins |
| 5: SCL_A | I/O (A-port) | A-side clock line, referenced to VCCA; connects to 1.8-V/3.3-V controller SCL pins |
| 6: OE | Input (active-high) | Output enable referenced to VCCA; drives all I/Os to high-Z when low; 5.5-V tolerant |
| 7: VCCB | Power (B-port) | Supplies B-port logic; sets high-voltage domain (2.3–5.5 V); powers internal B-port pullups |
| 8: SCL_B | I/O (B-port) | B-side clock line, referenced to VCCB; connects to 3.3-V/5-V peripheral SCL pins |
Key Features
| Feature | Design Value |
|---|---|
| No direction pin required | Auto-direction sensing via pass-gate architecture eliminates GPIO overhead and routing complexity |
| VCC isolation | Both ports enter high-impedance if either VCCA or VCCB = 0 V - prevents backfeeding and bus contention during power sequencing |
| Integrated 10-kΩ pullups | Eliminates external resistors on SDA/SCL lines for I²C/SMBus, reducing BOM count and board area |
| Independent power sequencing | VCCA or VCCB may power up first - removes strict supply-ramp ordering constraints in multi-rail systems |
| 5.5-V tolerant OE input | Allows direct connection to 5-V GPIO or microcontroller outputs without level-shifting circuitry |
Applications
| Industrial Sensor Hub | Automotive Body Control Module |
|---|---|
Use Scenario: Interfacing 1.8-V MEMS sensors and 3.3-V CAN transceivers over shared I²C bus in a compact sensor node. IC Role / Device Role / Timing Role: Voltage-level translator enabling bidirectional SDA/SCL communication between mismatched voltage domains while preserving I²C timing integrity. Use Value: Eliminates discrete resistor networks and reduces layout complexity, improving signal integrity at 400-kHz Fast-mode I²C speeds. | Use Scenario: Connecting 3.3-V microcontroller I²C port to 5-V EEPROM and diagnostic ICs in a vehicle door module. IC Role / Device Role / Timing Role: Robust level shifter with 8-kV HBM ESD protection on B-port, ensuring reliability in electrically noisy automotive environments. Use Value: Withstands ESD events common in assembly and field service, avoiding bus lockup or component damage without external TVS diodes. |
| Medical Wearable Data Logger | POS Terminal Peripheral Interface |
Use Scenario: Isolating low-power 1.8-V MCU I²C bus from 5-V display driver and NFC reader ICs in a battery-operated wearable. IC Role / Device Role / Timing Role: Low-quiescent-current (≤2 µA) translator activated only during data transfer, minimizing standby power draw. Use Value: Extends battery life by disabling internal pullups and placing I/Os in high-Z during sleep, eliminating leakage paths. | Use Scenario: Bridging 3.3-V payment processor SoC to legacy 5-V thermal printer and magnetic stripe reader over SMBus. IC Role / Device Role / Timing Role: SMBus 3.0-compliant translator supporting 1-MHz clock rates and guaranteed timing margins across temperature. Use Value: Ensures deterministic transaction completion within SMBus timeout windows, preventing host timeout errors during peripheral polling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9306DCUR | Supports only 1.2–3.6 V on A-port and 1.8–5.5 V on B-port; no integrated pullups; lower ESD (4-kV HBM B-port) | Lacks internal pullups - requires external 10-kΩ resistors; less robust in high-ESD environments | Choose PCA9306DCUR only if external pullups are already present and ESD stress is below 4 kV. |
| TXS0102DCUR | Auto-directional, 1.65–3.6 V A-port / 2.3–5.5 V B-port, but no integrated pullups and higher propagation delay (up to 25 ns) | Requires external pullups; slower rise/fall times limit max I²C speed to standard-mode (100 kHz) under heavy capacitive loads | Select TXS0102DCUR when ultra-low dynamic power is critical and timing margin allows >25-ns delays. |
Compared with PCA9306DCUR and TXS0102DCUR, the TCA9406 provides integrated pullups, superior B-port ESD protection (8 kV), and tighter timing (≤10 ns propagation), making it optimal for space-constrained, high-reliability I²C designs where BOM reduction and noise immunity are prioritized.
Availability
TCA9406 is available at Aetrix Electronics and suitable for industrial sensor hubs, automotive body control modules, medical wearables, and POS terminal interfaces requiring stable component supply and long-term production continuity.
Supply support for TCA9406 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 experience in interface solutions and industrial-grade reliability.
The TCA9406 belongs to TI's voltage-level translation product line, designed specifically for robust, low-overhead I²C/SMBus interoperability across mixed-voltage systems in harsh or space-constrained environments.
FAQ
What is the maximum supported I²C clock frequency for TCA9406?
The TCA9406 supports I²C Fast-mode Plus operation at up to 1 MHz SCL frequency in open-drain configuration, and achieves up to 2 Mbps data rate under optimized conditions. Its propagation delay (1.3–10 ns) and rise/fall time specs ensure timing compliance across VCCA/VCCB combinations, including 1.8-V A-port with 5-V B-port.
Can TCA9406 operate with VCCA = 3.3 V and VCCB = 5 V?
Yes, TCA9406 supports VCCA = 3.3 V and VCCB = 5 V, as confirmed by its recommended operating conditions (VCCA ≤ 3.6 V, VCCB ≤ 5.5 V, and VCCA ≤ VCCB). Electrical characteristics tables explicitly include test data for this combination, including VOLB ≤ 0.4 V and tPHL/tPLH ≤ 4.6 ns under push-pull driving.
Does TCA9406 require external pullup resistors?
No, TCA9406 integrates 10-kΩ pullup resistors on all four I/O pins (SDA_A, SCL_A, SDA_B, SCL_B). These are active only when OE = high and VCCA/VCCB are powered. External pullups may be added in parallel to reduce total resistance and improve rise time in high-capacitance bus configurations.
What happens to the I/O pins when OE is driven low?
When OE is driven low, all I/O pins (SDA_A, SCL_A, SDA_B, SCL_B) enter a high-impedance state regardless of VCCA or VCCB status - effectively disconnecting both sides of the bus. This feature reduces quiescent current to ≤2 µA and prevents backfeeding, enabling clean power gating in low-power systems.
Is the OE pin of TCA9406 5-V tolerant?
Yes, the OE pin is referenced to VCCA but rated for 5.5-V absolute maximum input voltage, making it 5-V tolerant. This allows direct connection to 5-V GPIO outputs or microcontroller pins without external level-shifting circuitry, simplifying interface design in mixed-voltage systems.
TCA9406DCUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TCA
- 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:
- 1.65 V ~ 3.6 V
- Voltage - VCCB:
- 2.3 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Open Drain
- Data Rate:
- 24Mbps
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- Auto-Direction Sensing
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFSOP (0.091", 2.30mm Width)
TCA9406DCUR FAQ
1.How can I place an order for TCA9406DCUR through Aetrix?
Please submit a Request for Quotation (RFQ) for TCA9406DCUR 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 TCA9406DCUR reliable?
The price and inventory of TCA9406DCUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TCA9406DCUR is usually 5 days.
3.What payment methods are accepted for TCA9406DCUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TCA9406DCUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TCA9406DCUR?
TCA9406DCUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TCA9406DCUR 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 TCA9406DCUR?
For technical support, including TCA9406DCUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TCA9406DCUR requirements.
6.How does Aetrix verify that TCA9406DCUR is sourced from the original manufacturer or authorized distributors?
All TCA9406DCUR 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 TCA9406DCUR meets industry standards.
7.What is the process for return or replacement of TCA9406DCUR?
All TCA9406DCUR units undergo pre-shipment inspection (PSI). If there is an issue with TCA9406DCUR, 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 TCA9406DCUR part is unused and in its original packaging.
Return procedure for TCA9406DCUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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