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Texas Instruments SN74AXC2T45DCUR
- Part No.:
- SN74AXC2T45DCUR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AXC2T45DCUR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,321
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Product details
Overview
SN74AXC2T45DCUR from Texas Instruments is a 2-bit noninverting translating transceiver with dual independently configurable power rails (VCCA and VCCB), supporting voltage translation between 0.65V and 3.6V per port, AEC-Q100 qualified for automotive use, and operating across –40°C to +125°C. It enables bidirectional level-shifting in mixed-voltage I²C, GPIO, and control bus interfaces.
For engineers reviewing the SN74AXC2T45DCUR datasheet, SN74AXC2T45DCUR pinout, SN74AXC2T45DCUR application, or SN74AXC2T45DCUR equivalent, key selection criteria include its VCC isolation feature, glitch-free power sequencing, Ioff partial-power-down support, and 380Mbps max data rate at 1.8V→3.3V translation - critical for low-power, multi-rail embedded systems.
Technical Context
The SN74AXC2T45DCUR implements asynchronous bidirectional data flow controlled by a single DIR input referenced to VCCA, enabling A→B or B→A transmission without clocking. Its dual-rail architecture decouples logic thresholds per port, allowing independent operation of A-port (VCCA-referenced) and B-port (VCCB-referenced) I/Os.
Glitch-free power supply sequencing ensures robustness during asymmetric power-up/down, while VCC isolation disables all I/Os into high-impedance when either VCCA or VCCB falls below 100mV - preventing back-drive and bus contention in fault or sleep states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 0.65V to 3.6V each - supports ultra-low-voltage cores (e.g., 0.8V AI accelerators) interfacing with 3.3V peripherals |
| Max Data Rate | 380Mbps at 1.8V→3.3V - enables high-speed sensor or display interface bridging without external clocking |
| Operating Temp | –40°C to +125°C - validated for under-hood automotive ECUs and industrial motor drives |
| Ioff Current | ±8µA max at 125°C - prevents leakage-induced logic corruption during partial power-down |
| VCC Isolation Threshold | <100mV on either rail - forces full I/O tri-state to avoid bus contention during brown-out or hot-swap |
| ESD Rating | ±8kV HBM, ±1kV CDM - meets stringent board-level ESD immunity requirements for consumer and automotive PCBs |
| Propagation Delay | Min 0.5ns, max 106ns (A→B, VCCA=0.7V/VCCB=3.3V, 125°C) - deterministic timing for real-time control loops |
Pinout & Package
SN74AXC2T45DCUR uses an 8-pin VSSOP (DCU) package measuring 2.0mm × 3.1mm, optimized for space-constrained automotive and portable electronics layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply reference | Bias source for A1/A2 inputs/outputs and DIR control logic - defines A-side logic thresholds |
| VCCB | B-port supply reference | Bias source for B1/B2 inputs/outputs - enables independent voltage domain translation |
| GND | Common ground return | Single shared reference for both ports - no separate ground pins required |
| DIR | Direction control input | Referenced to VCCA; high = A→B, low = B→A - enables dynamic bus direction switching |
| A1, A2 | A-port bidirectional I/O | Configurable as input or output depending on DIR state; track VCCA voltage range |
| B1, B2 | B-port bidirectional I/O | Configurable as input or output depending on DIR state; track VCCB voltage range |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail level shifting | Independent VCCA/VCCB supplies enable seamless interconnection of sub-1V logic (e.g., ARM Cortex-M0+) with legacy 3.3V peripherals |
| VCC isolation | Automatic high-impedance shutdown when either supply drops below 100mV - eliminates need for external power-fail detection circuitry |
| Glitch-free sequencing | Robust operation regardless of VCCA/VCCB power-up order - simplifies PMIC sequencing design in multi-rail systems |
| Ioff partial-power-down | Prevents damaging current flow into powered-down ports - essential for hot-plug and battery-backed subsystems |
| AEC-Q100 qualification | Grade 1 (-40°C to +125°C) compliance - certified for safety-critical automotive applications including ADAS and body control modules |
Applications
| Automotive Body Control Module | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Interfacing a 1.2V microcontroller GPIO bank with 24V digital input modules via opto-isolated level-shifted signals. IC Role / Device Role / Timing Role: Bidirectional voltage translator isolating MCU logic domain from field-side 3.3V interface ICs. Use Value: Eliminates discrete resistor-divider networks and enables direct connection to isolated RS-485 PHYs with <100ns propagation delay tolerance. | Use Scenario: Bridging a 0.8V FPGA configuration bus to 3.3V EEPROM and flash memory in modular I/O head designs. IC Role / Device Role / Timing Role: Level-shifting transceiver managing bidirectional data flow during FPGA reconfiguration and firmware updates. Use Value: Supports 380Mbps burst transfers while maintaining Ioff protection during partial FPGA power-down sequences. |
| Wireless Baseband Processor Interface | Smart Building Sensor Hub |
Use Scenario: Translating control signals between a 0.65V AI inference accelerator and 1.8V Wi-Fi 6 RF transceiver in edge gateway hardware. IC Role / Device Role / Timing Role: Low-voltage bidirectional translator enabling power-gated communication channels with sub-1ns timing margin. Use Value: Enables aggressive DVFS scaling on the accelerator side without violating setup/hold times on the RF IC's control lines. | Use Scenario: Connecting multiple 1.2V environmental sensors (temp/humidity/CO₂) to a 3.3V MCU-based HVAC controller over shared I²C bus. IC Role / Device Role / Timing Role: Voltage-translating I²C buffer with integrated VCC isolation to prevent bus lockup during sensor power cycling. Use Value: Maintains I²C SDA/SCL integrity across voltage domains while automatically tri-stating during sensor brown-out events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar translating transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LXC2T45DCUR | Lower ICCA/ICCB (max 10µA vs. 14µA), identical pinout and voltage range - optimized for ultra-low-quiescent systems | Preferred for battery-powered IoT nodes where µA-level sleep current dominates lifetime budget | Select when static power is more critical than transient drive strength; same layout and firmware compatibility |
| TXS0202DCUR | Auto-direction sensing (no DIR pin), lower max speed (100Mbps), higher VOL at 3.3V (0.7V vs. 0.55V) | Suitable for simple push-pull buses like I²C but not for controlled-direction protocols (e.g., SPI, GPIO toggling) | Choose only for passive-bus applications requiring zero-control-pin simplicity - not drop-in for DIR-driven systems |
Compared with SN74LXC2T45DCUR and TXS0202DCUR, the SN74AXC2T45DCUR delivers superior high-speed translation capability (380Mbps), precise DIR-controlled directionality, and tighter VOL/VOH specs - making it optimal for deterministic, high-throughput, mixed-voltage control paths in automotive and industrial systems.
Availability
SN74AXC2T45DCUR is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O expansion, and wireless baseband processor interfaces requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for SN74AXC2T45DCUR 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 solutions, with deep expertise in automotive-grade IC design and manufacturing.
The SN74AXC2T45DCUR belongs to TI's AXC family of low-voltage translating transceivers, engineered specifically for high-speed, low-power, multi-rail interoperability in next-generation automotive and industrial control systems.
FAQ
What is the minimum operating voltage for SN74AXC2T45DCUR on each rail?
The SN74AXC2T45DCUR supports VCCA and VCCB down to 0.65V each, enabling direct interfacing with advanced ultra-low-voltage logic families such as ARM Cortex-M0+ cores and sub-1V FPGAs. This specification is guaranteed across the full –40°C to +125°C temperature range and verified per TI's SCES880D datasheet Section 5.3.
Does SN74AXC2T45DCUR require external pull-up resistors on its I/O lines?
No - the SN74AXC2T45DCUR does not integrate internal pull-ups, and external pull-up resistors must be added per application requirements (e.g., I²C bus termination). The device operates as a pure level-shifting transceiver with no built-in biasing; pull-up values depend on bus capacitance, speed, and voltage levels, typically 2.2kΩ–10kΩ for 1.8V/3.3V translation.
How does the VCC isolation feature behave during power sequencing in SN74AXC2T45DCUR?
When either VCCA or VCCB drops below 100mV, the SN74AXC2T45DCUR immediately places both A1/A2 and B1/B2 I/Os into high-impedance state - regardless of DIR state or input voltages. This prevents back-driving, bus contention, or latch-up during asymmetric power-down, and is fully characterized per Section 7.3 of the SCES880D datasheet.
Can SN74AXC2T45DCUR translate between 0.65V and 3.3V simultaneously?
Yes - the SN74AXC2T45DCUR is explicitly rated for simultaneous operation with VCCA = 0.65V and VCCB = 3.3V, delivering up to 380Mbps in that configuration. Propagation delay remains within spec (max 106ns at 125°C), and VOH/VOL meet guaranteed limits per Table 5.5 in the SCES880D datasheet.
Is SN74AXC2T45DCUR pin-compatible with other TI dual-rail translators like SN74AVC2T45?
Yes - SN74AXC2T45DCUR shares identical 8-pin VSSOP (DCU) pinout, terminal functions, and footprint with SN74AVC2T45DCUR and SN74LXC2T45DCUR. This enables direct replacement in existing layouts, though electrical performance (speed, drive strength, quiescent current) differs per family, so validation against timing and power targets is required.
SN74AXC2T45DCUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AXC
- 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:
- 0.65 V ~ 3.6 V
- Voltage - VCCB:
- 0.65 V ~ 3.6 V
- Input Signal:
- CMOS
- Output Signal:
- CMOS
- Output Type:
- Tri-State, Non-Inverted
- Data Rate:
- 380Mbps
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFSOP (0.091", 2.30mm Width)
SN74AXC2T45DCUR FAQ
1.How can I place an order for SN74AXC2T45DCUR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AXC2T45DCUR 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 SN74AXC2T45DCUR reliable?
The price and inventory of SN74AXC2T45DCUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AXC2T45DCUR is usually 5 days.
3.What payment methods are accepted for SN74AXC2T45DCUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AXC2T45DCUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AXC2T45DCUR?
SN74AXC2T45DCUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AXC2T45DCUR 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 SN74AXC2T45DCUR?
For technical support, including SN74AXC2T45DCUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AXC2T45DCUR requirements.
6.How does Aetrix verify that SN74AXC2T45DCUR is sourced from the original manufacturer or authorized distributors?
All SN74AXC2T45DCUR 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 SN74AXC2T45DCUR meets industry standards.
7.What is the process for return or replacement of SN74AXC2T45DCUR?
All SN74AXC2T45DCUR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AXC2T45DCUR, 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 SN74AXC2T45DCUR part is unused and in its original packaging.
Return procedure for SN74AXC2T45DCUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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