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Texas Instruments SN74LVC1T45DBVRE4
- Part No.:
- SN74LVC1T45DBVRE4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC1T45DBVRE4.pdf
- Description:
- IC TRANSLATOR BIDIR SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVC1T45 from Texas Instruments is a single-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.65V–5.5V domains, featuring configurable VCCA/VCCB rails, 3-state outputs, ±24mA drive at 3.3V, 4µA max ICC, and VCC isolation. It serves in low-voltage interconnects between mixed-voltage SoCs, FPGAs, and peripherals.
For engineers reviewing the SN74LVC1T45 datasheet, SN74LVC1T45 pinout, SN74LVC1T45 application, or SN74LVC1T45 equivalent, key selection criteria include dual-rail operating range (1.65V–5.5V), direction-control logic referenced to VCCA, Ioff partial-power-down support, 420Mbps max data rate (3.3V→5V), and NanoFree™ SOT-23-6 package compatibility.
Technical Context
The SN74LVC1T45 implements asynchronous bidirectional translation via DIR-controlled output enable: high DIR enables A→B transmission; low DIR enables B→A. Its input circuitry remains active on both ports regardless of DIR state, requiring defined logic levels to avoid excess ICCZ.
VCCA powers the DIR input and A-port interface; VCCB powers the B port. The VCC isolation feature forces both ports into high-impedance when either VCCA or VCCB = GND, and Ioff limits leakage to ±2µA over –40°C to +85°C during power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - supports translation across 1.8V/2.5V/3.3V/5V nodes without level-shifters |
| Max Data Rate | 420Mbps (3.3V→5V) - enables high-speed interface bridging in USB, PCIe auxiliary, or MIPI D-PHY control paths |
| Output Drive | ±24mA at 3.3V - sufficient to drive 50Ω transmission lines or multiple CMOS inputs with fast edge rates |
| Ioff Leakage | ±2µA max (–40°C to +85°C) - prevents backflow during partial power-down in battery-backed or hot-swap systems |
| Propagation Delay | 0.5ns–17.7ns (VCCA=5V→1.8V) - deterministic timing for synchronous handshaking in FPGA-to-ASIC links |
| ESD Rating | ±2000V HBM - meets industrial IEC 61000-4-2 system-level robustness requirements |
| Quiescent Current | 4µA max ICC - enables always-on voltage translation in ultra-low-power IoT sensor hubs |
Pinout & Package
SN74LVC1T45DBVRE4 uses the DBV (SOT-23-6) package: 2.9mm × 2.8mm footprint, 6-pin surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | Power supply for A port and DIR input | Defines A-port I/O voltage domain and DIR logic threshold; must be stable before signal application |
| GND | Signal and power reference ground | Common return path for both rails; requires low-inductance connection to minimize noise coupling |
| A | Bidirectional I/O port referenced to VCCA | Input threshold and output swing follow VCCA; connects to 1.65V–5.5V source (e.g., FPGA I/O bank) |
| B | Bidirectional I/O port referenced to VCCB | Input threshold and output swing follow VCCB; interfaces with independent voltage domain (e.g., 1.8V sensor) |
| DIR | Direction control input (active-high) | Logic level referenced to VCCA; high = A→B, low = B→A; no internal pullup/pulldown |
| VCCB | Power supply for B port | Defines B-port voltage domain; enables independent rail sequencing and isolation behavior |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.65V–5.5V operation on VCCA and VCCB enables interoperability between legacy 5V logic and modern 1.8V/2.5V subsystems |
| VCC isolation | Automatic high-impedance on both ports if either VCCA or VCCB = GND - eliminates risk of bus contention during power sequencing |
| Ioff partial-power-down | Prevents current backflow when powered down; supports hot-plug and battery-save modes in portable electronics |
| NanoFree™ packaging | Dies-as-packages reduce thermal resistance (RθJA = 215.1°C/W) and board space vs. standard SOT-23 |
| Glitch-free supply sequencing | No power-up/down order required for VCCA/VCCB - simplifies PMIC design and avoids false logic transitions |
Applications
| Industrial PLC I/O Module | FPGA-to-Memory Interface |
|---|---|
Use Scenario: Bridging 3.3V FPGA GPIO to 24V industrial fieldbus transceivers via isolated level-shifting stage. IC Role / Device Role / Timing Role: Voltage translator isolating logic domains while preserving signal integrity and timing margins. Use Value: Enables direct FPGA control of 24V I/O without external level-shifter ICs or discrete MOSFET solutions, reducing BOM count by 1 component. | Use Scenario: Interfacing 1.8V LPDDR4 controller to 3.3V legacy SRAM in embedded test equipment. IC Role / Device Role / Timing Role: Bidirectional data path translator with sub-10ns propagation delay ensuring setup/hold compliance. Use Value: Eliminates need for dual-supply SRAM or complex clock-domain crossing logic, cutting PCB layer count by one. |
| USB-C Power Delivery Controller | Automotive Body Control Module |
Use Scenario: Translating CC line signaling between 5V PD controller and 3.3V microcontroller in USB-C port negotiation. IC Role / Device Role / Timing Role: Low-capacitance (6pF) bidirectional translator supporting 420Mbps burst communication during PD contract negotiation. Use Value: Meets USB-IF timing specs for CC line toggling while surviving ±2kV HBM ESD events in unshielded connector environments. | Use Scenario: Level-shifting LIN bus signals between 5V MCU and 12V automotive sensors with shared ground. IC Role / Device Role / Timing Role: Robust voltage translator with VCC isolation preventing fault propagation during battery disconnect events. Use Value: Maintains LIN bus integrity during cold-cranking (VCCB dip to 0V) without requiring external reset supervision or watchdog intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0101DCUR | Auto-direction sensing (no DIR pin); lower drive (±2mA); higher ICC (10µA) | Eliminates DIR control logic but unsuitable for high-speed or high-drive use cases | Select when direction is predictable and speed < 10Mbps; avoid for 420Mbps or ±24mA loads |
| SN74AVC1T45DBVR | Wider VCC range (1.2V–3.6V); lower max data rate (200Mbps); same pinout | Optimized for sub-1.8V mobile interfaces; not rated for 5V domains | Choose only for 1.2V–3.3V-only systems; incompatible with 5V translation requirements |
Compared with TXS0101DCUR and SN74AVC1T45DBVR, SN74LVC1T45DBVRE4 uniquely supports full 1.65V–5.5V dual-rail operation with 420Mbps throughput and ±24mA drive-making it the sole option for mixed-voltage, high-speed, high-drive bridging where DIR control is acceptable.
Availability
SN74LVC1T45DBVRE4 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, FPGA-to-memory interfaces, USB-C power delivery controllers, and automotive body control modules requiring stable component supply across extended temperature and mixed-voltage designs.
Supply support for SN74LVC1T45DBVRE4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog, power management, and interface technologies.
The SN74LVC1T45 belongs to TI's LVC logic family, engineered for low-voltage, high-speed bidirectional translation in space-constrained, mixed-rail systems such as portable instrumentation, industrial automation, and automotive infotainment.
FAQ
What voltage ranges does the SN74LVC1T45DBVRE4 support on its VCCA and VCCB rails?
The SN74LVC1T45DBVRE4 supports independent 1.65V to 5.5V operation on both VCCA and VCCB. This allows translation between any combination of 1.8V, 2.5V, 3.3V, and 5V logic domains. Operation outside this range violates absolute maximum ratings and may cause permanent damage to the SN74LVC1T45DBVRE4.
How does the DIR pin control data flow direction in the SN74LVC1T45DBVRE4?
In the SN74LVC1T45DBVRE4, a high-level DIR input (referenced to VCCA) enables data transmission from the A port to the B port; a low-level DIR input enables transmission from B to A. The DIR pin has no internal pullup or pulldown, so external biasing is required in floating states to prevent undefined behavior in the SN74LVC1T45DBVRE4.
Does the SN74LVC1T45DBVRE4 support partial power-down, and how is it implemented?
Yes, the SN74LVC1T45DBVRE4 supports partial power-down via its Ioff feature. When either VCCA or VCCB is at 0V, the SN74LVC1T45DBVRE4 automatically places both A and B ports in high-impedance, limiting leakage to ±2µA. This prevents back-current flow in battery-backed or hot-swap systems using the SN74LVC1T45DBVRE4.
What is the maximum data rate achievable with the SN74LVC1T45DBVRE4, and under what conditions?
The SN74LVC1T45DBVRE4 achieves up to 420Mbps when translating from 3.3V to 5V (VCCA = 3.3V, VCCB = 5V). Lower rates apply for other combinations: 210Mbps (to 3.3V), 140Mbps (to 2.5V), and 75Mbps (to 1.8V). These values are measured under specified load and temperature conditions per the SN74LVC1T45DBVRE4 datasheet.
Is the SN74LVC1T45DBVRE4 compatible with the NanoFree™ package, and what are its benefits?
Yes, the SN74LVC1T45DBVRE4 in DBV package uses Texas Instruments' NanoFree™ technology, where the silicon die functions as the package. This reduces footprint (2.9mm × 2.8mm), lowers thermal resistance (RθJA = 215.1°C/W), and improves solder joint reliability compared to conventional SOT-23 packaging - critical for dense layouts using the SN74LVC1T45DBVRE4.
SN74LVC1T45DBVRE4 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:
- 1
- 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:
- SOT-23-6
SN74LVC1T45DBVRE4 FAQ
1.How can I place an order for SN74LVC1T45DBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC1T45DBVRE4 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 SN74LVC1T45DBVRE4 reliable?
The price and inventory of SN74LVC1T45DBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC1T45DBVRE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC1T45DBVRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC1T45DBVRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC1T45DBVRE4?
SN74LVC1T45DBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC1T45DBVRE4 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 SN74LVC1T45DBVRE4?
For technical support, including SN74LVC1T45DBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC1T45DBVRE4 requirements.
6.How does Aetrix verify that SN74LVC1T45DBVRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC1T45DBVRE4 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 SN74LVC1T45DBVRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC1T45DBVRE4?
All SN74LVC1T45DBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC1T45DBVRE4, 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 SN74LVC1T45DBVRE4 part is unused and in its original packaging.
Return procedure for SN74LVC1T45DBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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