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Texas Instruments SN74LVC2T45DCURG4
- Part No.:
- SN74LVC2T45DCURG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC2T45DCURG4.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,403
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Product details
Overview
SN74LVC2T45 from Texas Instruments is a dual-bit, dual-supply noninverting bus transceiver enabling bidirectional voltage translation between 1.65 V and 5.5 V rails (e.g., 1.8 V ↔ 3.3 V, 3.3 V ↔ 5 V). It features independent VCCA and VCCB supplies, ±24-mA output drive at 3.3 V, 4-μA maximum ICC, and VCC isolation. It serves in mixed-voltage I/O interfacing on embedded controllers and FPGAs.
For engineers reviewing the SN74LVC2T45 datasheet, SN74LVC2T45 pinout, SN74LVC2T45 application, or SN74LVC2T45 equivalent, key selection criteria include configurable dual-rail operation, Ioff partial-power-down support, high-speed translation up to 420 Mbps (3.3 V → 5 V), DIR-referenced control logic, and NanoFree™ package compatibility with space-constrained PCB layouts.
Technical Context
The SN74LVC2T45 implements asynchronous bidirectional data flow controlled by a single DIR input referenced to VCCA. A-port I/Os track VCCA (1.65–5.5 V); B-port I/Os track VCCB (1.65–5.5 V). Its Ioff circuitry disables outputs during power-down, preventing backflow current, while VCC isolation forces both ports into high-impedance when either supply drops to GND.
Propagation delays are voltage-dependent: tPLH/tPHL range from 0.5 ns (5 V → 5 V) to 17.7 ns (1.8 V → 1.8 V); enable/disable times (tPHZ/tPLZ) vary from 1.4 ns to 30.9 ns based on VCCA/VCCB combinations. The device supports glitch-free power sequencing-no erroneous transitions occur during asymmetric rail ramp-up/down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range (VCCA / VCCB) | 1.65 V to 5.5 V each - enables translation across 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without level-shifter ICs. |
| Max Data Rate | 420 Mbps (3.3 V → 5 V) - supports high-speed peripheral interfaces like UART, SPI, and GPIO expansion in mixed-voltage systems. |
| Output Drive | ±24 mA at 3.3 V - drives moderate capacitive loads (e.g., 10–15 pF traces) with fast edge rates, reducing need for external buffers. |
| Ioff | ±2 µA max - ensures safe partial-power-down operation, blocking backflow current when one supply is off (e.g., sleep-mode subsystems). |
| ESD Protection | ±4000 V HBM - meets industrial-grade robustness requirements for handling and board-level reliability. |
| ICC (max) | 4 µA - enables ultra-low static power in battery-backed or always-on monitoring circuits. |
| Operating Temp | –40 °C to +85 °C - qualified for industrial and extended commercial environments without derating. |
Pinout & Package
SN74LVC2T45 is packaged in the Texas Instruments NanoFree™ DCT (SM8, 8-pin) package: 2.95 mm × 4.00 mm, leadless, wettable flank compatible. Pinout is identical across DCT, DCU, and YZP variants per TI SCES516N Rev. JUNE 2024.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply reference | Powers A1/A2 I/Os and DIR input; sets A-side logic thresholds and output swing. |
| A1 (Pin 2) | A-port bidirectional data line | Transfers data to/from A bus; referenced to VCCA; must be driven HIGH/LOW-not floated. |
| A2 (Pin 3) | A-port bidirectional data line | Second independent A-side channel; electrically isolated from A1 but shares VCCA and DIR. |
| GND (Pin 4) | Common ground reference | Single ground connection required; no separate analog/digital GND pins. |
| DIR (Pin 5) | Direction control input | Referenced to VCCA; HIGH = A→B transfer, LOW = B→A transfer; no internal pullup/pulldown. |
| B2 (Pin 6) | B-port bidirectional data line | Transfers data to/from B bus; referenced to VCCB; threshold and drive set by VCCB. |
| B1 (Pin 7) | B-port bidirectional data line | Second independent B-side channel; shares VCCB and DIR with B2. |
| VCCB (Pin 8) | B-port supply reference | Powers B1/B2 I/Os; independent of VCCA-enables true dual-rail translation. |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail supply | VCCA and VCCB independently set from 1.65 V to 5.5 V-eliminates need for discrete level-shifting components in multi-voltage SoC/FPGA designs. |
| VCC isolation | Both ports enter high-impedance if either VCCA or VCCB = GND-prevents signal contention during power sequencing or fault conditions. |
| Ioff partial-power-down support | Outputs disabled with leakage ≤ ±2 µA when powered down-enables safe integration into low-power subsystems (e.g., sensor hubs, wake-on-event circuits). |
| High-speed translation | 420 Mbps max (3.3 V → 5 V) with propagation delays as low as 0.5 ns-meets timing budgets for high-frequency digital interfaces without added latency. |
| Glitch-free power sequencing | No spurious output transitions during asymmetric VCCA/VCCB ramp-up/down-avoids false triggers in peripherals sensitive to metastability (e.g., reset lines, configuration registers). |
| NanoFree™ packaging | Leadless DCT package with wettable flanks-supports automated optical inspection (AOI) and improves solder joint reliability in high-volume manufacturing. |
Applications
| Industrial PLC I/O Expansion | FPGA-to-Microcontroller Interface |
|---|---|
|
Use Scenario: Interfacing 3.3-V FPGA I/O banks with legacy 5-V industrial sensors and actuators via modular I/O cards. IC Role / Device Role / Timing Role: Bidirectional voltage translator enabling real-time status reporting and command execution across voltage domains without protocol conversion. Use Value: Eliminates discrete resistor-divider or MOSFET-based translators, reducing BOM count and layout area while maintaining 420-Mbps burst capability for diagnostics. |
Use Scenario: Connecting a 1.8-V microcontroller's GPIO to a 3.3-V FPGA configuration interface during boot and runtime reconfiguration. IC Role / Device Role / Timing Role: Dual-rail transceiver managing direction-controlled data flow for FPGA register reads/writes and status polling. Use Value: Supports Ioff and VCC isolation to prevent backfeed during MCU sleep modes, ensuring FPGA retains configuration state without auxiliary power management. |
| USB-C Power Delivery Negotiation | Automotive Body Control Module |
|
Use Scenario: Level-shifting CC line communication between a 5-V USB PD controller and a 3.3-V system management unit in portable chargers. IC Role / Device Role / Timing Role: Low-latency, bidirectional translator handling BMC (Biphase Mark Code) signaling at up to 300 kbps with precise edge control. Use Value: Meets USB PD spec ESD requirements (±4000 V HBM) and provides glitch-free sequencing during hot-plug events. |
Use Scenario: Isolating 5-V LIN transceiver signals from 3.3-V microcontroller GPIOs in body control modules with mixed-voltage subassemblies. IC Role / Device Role / Timing Role: Voltage translator enabling bidirectional diagnostic messaging and sensor feedback over shared LIN bus infrastructure. Use Value: VCC isolation prevents bus lockup if LIN supply faults, and ±24-mA drive ensures robust noise immunity in automotive EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0102DCUR | Auto-direction sensing (no DIR pin); lower drive (±8 mA at 3.3 V); higher ICC (10 µA typical) | Best for push-pull buses where direction is inferred (e.g., I²C), not DIR-controlled protocols (e.g., SPI, GPIO) | Select SN74LVC2T45 when explicit DIR control, higher drive, or lower quiescent current is required. |
| SN74AVC2T244RSWR | Two independent 2-bit buffers (non-bidirectional); no VCC isolation; 3.6-V max VCC | Suited for unidirectional fanout (e.g., address/data latching), not bidirectional translation | Choose SN74LVC2T45 for true bidirectional, dual-rail, isolated translation in mixed-voltage interconnects. |
Compared with TXS0102DCUR and SN74AVC2T244RSWR, the SN74LVC2T45 uniquely combines DIR-controlled bidirectionality, full 1.65–5.5-V dual-rail operation, VCC isolation, and <4-µA ICC-making it optimal for deterministic, low-power, mixed-voltage system interconnects where direction is software-managed.
Availability
SN74LVC2T45 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, USB-C power delivery systems, and FPGA/microcontroller co-designs requiring stable component supply and long-term manufacturability.
Supply support for SN74LVC2T45 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 company specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and interface solutions.
The SN74LVC2T45 belongs to TI's LVC logic family, designed specifically for low-voltage, mixed-signal system interfacing-emphasizing voltage translation, power efficiency, and robustness in space- and power-constrained embedded applications.
FAQ
What is the function of the DIR pin on the SN74LVC2T45?
The DIR (direction) pin on the SN74LVC2T45 is a control input referenced to VCCA that determines data flow direction: a logic HIGH enables transmission from the A port to the B port, while a logic LOW enables transmission from the B port to the A port. It does not affect the A1/A2 or B1/B2 I/O states directly but gates which side drives the bus. The SN74LVC2T45 requires this explicit control-unlike auto-sensing translators-and supports clean switching with no bus contention when DIR changes state.
Can SN74LVC2T45 translate between 1.8 V and 5 V in both directions?
Yes, the SN74LVC2T45 supports bidirectional translation between 1.8 V and 5 V. When VCCA = 1.8 V and VCCB = 5 V, it translates B→A at up to 75 Mbps; when VCCA = 5 V and VCCB = 1.8 V, it translates A→B at the same rate. The device maintains valid logic thresholds and output drive across this full range, with propagation delays specified in TI SCES516N for all VCCA/VCCB combinations-including 1.8 V/5 V pairs.
Does SN74LVC2T45 support partial power-down, and how is it implemented?
Yes, the SN74LVC2T45 supports partial power-down via its Ioff feature. When either VCCA or VCCB is at 0 V (GND), the Ioff circuitry disables all outputs, placing both A and B ports in high-impedance state with leakage ≤ ±2 µA. This prevents damaging current backflow into powered-down sections of a system. The SN74LVC2T45 datasheet specifies Ioff under Electrical Characteristics (Section 5.5), confirming compliance with JEDEC JESD78 Class II latch-up immunity.
What package options are available for SN74LVC2T45, and which is used in the DCURG4 variant?
The SN74LVC2T45 is offered in DCT (SM8), DCU (VSSOP), and YZP (DSBGA) packages. The "DCURG4" suffix denotes the DCT package: an 8-pin, leadless, NanoFree™封装 measuring 2.95 mm × 4.00 mm with wettable flanks for reliable automated optical inspection. This variant is optimized for high-density PCBs where thermal performance and manufacturability are critical-RθJA = 195.3 °C/W per TI thermal metrics.
How does SN74LVC2T45 handle power supply sequencing, and why does it matter?
The SN74LVC2T45 guarantees glitch-free operation during asymmetric power supply sequencing-meaning VCCA and VCCB may be powered up or down in any order without causing spurious output transitions. This eliminates false data bits or unintended resets in connected peripherals. For example, if VCCB ramps before VCCA, B-port inputs remain inactive until VCCA stabilizes. This behavior is verified in TI's characterization and is critical in systems with staggered power domains, such as multi-rail FPGAs or modular power architectures.
SN74LVC2T45DCURG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 2
- Voltage - VCCA:
- 1.65 V ~ 5.5 V
- Voltage - VCCB:
- 1.65 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Tri-State, Non-Inverted
- Data Rate:
- 420Mbps
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFSOP (0.091", 2.30mm Width)
SN74LVC2T45DCURG4 FAQ
1.How can I place an order for SN74LVC2T45DCURG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC2T45DCURG4 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 SN74LVC2T45DCURG4 reliable?
The price and inventory of SN74LVC2T45DCURG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC2T45DCURG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC2T45DCURG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC2T45DCURG4 transactions.
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4.How is shipping managed for SN74LVC2T45DCURG4?
SN74LVC2T45DCURG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC2T45DCURG4 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 SN74LVC2T45DCURG4?
For technical support, including SN74LVC2T45DCURG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC2T45DCURG4 requirements.
6.How does Aetrix verify that SN74LVC2T45DCURG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC2T45DCURG4 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 SN74LVC2T45DCURG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC2T45DCURG4?
All SN74LVC2T45DCURG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC2T45DCURG4, 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 SN74LVC2T45DCURG4 part is unused and in its original packaging.
Return procedure for SN74LVC2T45DCURG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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