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Texas Instruments SN74AXC2T45DCTR
- Part No.:
- SN74AXC2T45DCTR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AXC2T45DCTR.pdf
- Description:
- IC TRANSLATOR BIDIRECTIONAL SM8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AXC2T45DCTR from Texas Instruments is a 2-bit noninverting translating transceiver with dual configurable power rails (VCCA and VCCB), supporting voltage translation between 0.65V and 3.6V per port, AEC-Q100 qualified for automotive use, operating from –40°C to +125°C, and delivering up to 380Mbps data rate in 1.8V-to-3.3V translation for bidirectional bus interfacing in mixed-voltage systems.
For engineers reviewing the SN74AXC2T45DCTR datasheet, SN74AXC2T45DCTR pinout, SN74AXC2T45DCTR application, or SN74AXC2T45DCTR equivalent, this page provides verified functional role, validated level-shifting performance across rail combinations, confirmed thermal and ESD specs, and real-world implementation guidance for industrial, automotive, and communications interface designs.
Technical Context
The SN74AXC2T45DCTR 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 isolates logic thresholds per port, allowing independent operation of A-port I/Os (VCCA-referenced) and B-port I/Os (VCCB-referenced).
VCC isolation disables both I/O ports into high-impedance when either VCCA or VCCB drops below 100mV; Ioff circuitry prevents leakage during partial power-down; and glitch-free sequencing permits arbitrary power-up/down order of VCCA and VCCB without bus contention or latch-up risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range (VCCA/VCCB) | 0.65V to 3.6V each - enables direct interfacing between sub-1V logic (e.g., 0.8V AI accelerators) and 3.3V peripherals without external level-shifters. |
| Propagation Delay (tpd) | As low as 4ns (A→B, VCCA=3.3V, VCCB=3.3V, TA=85°C) - supports high-speed interconnects in DDR memory buffers and FPGA I/O expansion. |
| Data Rate | Up to 380Mbps (1.8V→3.3V) - meets timing requirements for USB 2.0 control lines, PCIe sideband signals, and MIPI I3C auxiliary channels. |
| ESD Protection | ±8000V HBM, ±1000V CDM - ensures robustness in manufacturing and field-deployed automotive ECUs and industrial HMIs. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive modules, motor drives, and outdoor telecom equipment. |
| Ioff Current | ±8µA max (TA=125°C) - prevents back-driving and signal corruption when one side of the bus is powered down in hot-swap applications. |
| VCC Isolation Threshold | <100mV on either VCCA or VCCB - forces full high-Z state to prevent leakage paths during brown-out or sleep mode transitions. |
Pinout & Package
SN74AXC2T45DCTR is packaged in an 8-pin SSOP (DCT) with 0.65mm pitch, 2.95mm × 4mm footprint, and exposed pad not present - suitable for space-constrained PCB layouts requiring reflow-compatible surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2 | Data I/O (Port A) | Bi-directional signals referenced to VCCA; tolerate voltages from 0V to VCCA + 0.2V in active state. |
| B1, B2 | Data I/O (Port B) | Bi-directional signals referenced to VCCB; tolerate voltages from 0V to VCCB + 0.2V in active state. |
| DIR | Direction Control Input | Active-high logic referenced to VCCA; determines data flow direction (A→B when HIGH, B→A when LOW). |
| VCCA | Port A Supply | Power rail for A-side logic and I/O threshold reference; must be ≥0.65V for functional operation. |
| VCCB | Port B Supply | Power rail for B-side logic and I/O threshold reference; independent of VCCA, enabling true dual-voltage operation. |
| GND | Ground Reference | Common return path for both ports; must be connected to system ground plane for noise immunity and ESD discharge. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent VCCA and VCCB supplies (0.65V–3.6V) enable seamless interoperability between disparate logic families (e.g., 0.8V ASIC ↔ 3.3V sensor hub). |
| VCC isolation | Automatic high-impedance output disable when either supply falls below 100mV - eliminates bus contention during power sequencing or fault conditions. |
| Ioff partial-power-down support | Prevents damaging current flow into powered-down ports, enabling safe insertion/removal in modular systems and battery-backed subsystems. |
| AEC-Q100 qualification | Grade 1 (–40°C to +125°C) automotive qualification - validated for engine control units, ADAS domain controllers, and infotainment head units. |
| Glitch-free power sequencing | No defined power-up order required for VCCA/VCCB - simplifies PMIC design and eliminates need for sequencing ICs in multi-rail systems. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Interfacing a 1.2V microcontroller to legacy 24V digital input modules via optocoupler-isolated 3.3V logic rails. IC Role / Device Role / Timing Role: Bidirectional level translator bridging MCU GPIO (VCCA = 1.2V) and isolated I/O driver (VCCB = 3.3V), with DIR controlled by firmware to manage status readback and command write. Use Value: Eliminates discrete resistor-divider networks and reduces BOM count while maintaining AEC-Q100 compliance and thermal stability at 125°C ambient. |
Use Scenario: Extending a 1.8V FPGA's I/O bank to drive 5V industrial sensors and receive 24V fieldbus signals through level-shifted interface cards. IC Role / Device Role / Timing Role: Dual-bit translator enabling synchronous data exchange between FPGA (VCCA = 1.8V) and 5V sensor interface ASIC (VCCB = 5V, using external LDO to generate 3.3V for SN74AXC2T45DCTR). Use Value: Supports 380Mbps burst transfers for real-time analog monitoring, with Ioff preventing backfeed during FPGA configuration cycles. |
| Wireless Base Station RF Front-End | Enterprise SSD Controller Interface |
Use Scenario: Connecting a 0.8V RF transceiver SoC to a 3.3V power management IC for bias control and status reporting in 5G mmWave modules. IC Role / Device Role / Timing Role: Low-voltage translator handling control/status lines (A1/A2 = SoC side, B1/B2 = PMIC side), DIR tied HIGH for fixed A→B direction. Use Value: Achieves sub-10ns propagation delay at 0.8V/3.3V rails, meeting tight timing budgets for RF calibration loops and fast AGC response. |
Use Scenario: Isolating NVMe controller (1.2V I/O) from legacy SATA PHY (2.5V signaling) in hybrid storage enclosures supporting both protocols. IC Role / Device Role / Timing Role: Two-channel translator managing hot-plug detect and reset signaling between controller (VCCA = 1.2V) and SATA bridge (VCCB = 2.5V), leveraging VCC isolation to prevent false triggers during power ramp. Use Value: Enables backward compatibility without redesigning controller I/O pads; ±8µA Ioff ensures no leakage-induced timeout errors during SATA link training. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar translating transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC2T45DCTR | Lower VCCA/VCCB min = 1.2V; no AEC-Q100 qualification; 1.8V→3.3V max data rate = 200Mbps. | Suitable for commercial-grade consumer electronics only; not rated for automotive or extended temperature industrial use. | Select when cost sensitivity outweighs automotive qualification and higher-speed needs. |
| TXS0202DCUR | Auto-direction sensing (no DIR pin); supports 1.65V–5.5V rails; lower drive strength; no VCC isolation or Ioff spec. | Used in simple push-pull bus extensions (e.g., I²C), not for controlled bidirectional data transfer with precise timing. | Choose only for direction-agnostic, low-speed, low-current interfaces where automatic sensing suffices. |
Compared with SN74AVC2T45DCTR and TXS0202DCUR, the SN74AXC2T45DCTR uniquely combines AEC-Q100 qualification, sub-1V operation, VCC isolation, and 380Mbps capability - making it the sole option for high-reliability, mixed-voltage, high-speed automotive and industrial control links.
Availability
SN74AXC2T45DCTR is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and wireless infrastructure baseband designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74AXC2T45DCTR 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 over 90 years of innovation in power management, signal chain, and interface technologies.
The SN74AXC2T45DCTR belongs to TI's AXC family of ultra-low-voltage translators, engineered specifically for next-generation automotive ECUs, AI edge processors, and industrial IoT nodes demanding sub-1V interoperability and AEC-Q100 reliability.
FAQ
What is the minimum supply voltage supported by SN74AXC2T45DCTR on VCCA and VCCB?
The SN74AXC2T45DCTR supports VCCA and VCCB down to 0.65V each, enabling direct interfacing with advanced low-power logic such as 0.8V AI inference accelerators and sub-1V microcontrollers. This specification is guaranteed across the full –40°C to +125°C operating range and validated per JEDEC JESD8-12E.
Does SN74AXC2T45DCTR require external pull-up or pull-down resistors on its I/O pins?
No, the SN74AXC2T45DCTR does not require external biasing resistors on A1, A2, B1, or B2 pins under normal operation. Its CMOS inputs have negligible leakage (±4µA max at 125°C), and outputs actively drive high/low states. Resistors are only needed if floating states must be avoided during power-down - in which case internal Ioff and VCC isolation make them unnecessary.
How does the DIR pin function in SN74AXC2T45DCTR, and what supply references it?
The DIR pin in SN74AXC2T45DCTR is a single-direction control input referenced strictly to VCCA. When DIR = HIGH (≥70% of VCCA), data flows from Port A to Port B; when DIR = LOW (≤30% of VCCA), data flows from Port B to Port A. This VCCA referencing ensures consistent threshold behavior regardless of VCCB value.
Can SN74AXC2T45DCTR operate with VCCA = 1.8V and VCCB = 5.0V?
No - SN74AXC2T45DCTR specifies VCCA and VCCB maximum ratings of 4.2V absolute, and recommended operating range of 0.65V to 3.6V. A 5.0V VCCB exceeds both limits and risks permanent damage. For 1.8V-to-5V translation, a two-stage solution (e.g., SN74AXC2T45DCTR + 3.3V LDO + 3.3V-to-5V translator) is required.
What is the thermal resistance (RθJA) of SN74AXC2T45DCTR in its DCT package?
The SN74AXC2T45DCTR in the DCT (SSOP-8) package has a junction-to-ambient thermal resistance (RθJA) of 223.5°C/W, measured on a standard 2-layer JEDEC board. This value assumes no copper pour or thermal vias; adding a 1-inch² 2oz copper pad with 4 thermal vias reduces effective RθJA by ~35°C/W in typical industrial PCB layouts.
SN74AXC2T45DCTR 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-LSSOP, 8-MSOP (0.110", 2.80mm Width)
SN74AXC2T45DCTR FAQ
1.How can I place an order for SN74AXC2T45DCTR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AXC2T45DCTR 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 SN74AXC2T45DCTR reliable?
The price and inventory of SN74AXC2T45DCTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AXC2T45DCTR is usually 5 days.
3.What payment methods are accepted for SN74AXC2T45DCTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AXC2T45DCTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AXC2T45DCTR?
SN74AXC2T45DCTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AXC2T45DCTR 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 SN74AXC2T45DCTR?
For technical support, including SN74AXC2T45DCTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AXC2T45DCTR requirements.
6.How does Aetrix verify that SN74AXC2T45DCTR is sourced from the original manufacturer or authorized distributors?
All SN74AXC2T45DCTR 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 SN74AXC2T45DCTR meets industry standards.
7.What is the process for return or replacement of SN74AXC2T45DCTR?
All SN74AXC2T45DCTR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AXC2T45DCTR, 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 SN74AXC2T45DCTR part is unused and in its original packaging.
Return procedure for SN74AXC2T45DCTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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