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Texas Instruments SN74LVC1T45DBVRG4
- Part No.:
- SN74LVC1T45DBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC1T45DBVRG4.pdf
- Description:
- IC TRANSLATOR BIDIR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,010
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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, with ±24mA drive at 3.3V, 4µA max ICC, and VCC isolation. It supports 420Mbps (3.3V→5V), operates across industrial temperature (–40°C to +85°C), and is used in low-pin-count I/O bridging between mixed-voltage SoCs and peripherals.
For engineers reviewing the SN74LVC1T45 datasheet, SN74LVC1T45 pinout, SN74LVC1T45 application, or SN74LVC1T45 equivalent, key selection criteria include dual-rail supply flexibility, Ioff partial-power-down support, DIR-controlled directionality, and NanoFree™ SOT-23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The SN74LVC1T45 implements a noninverting, dual-rail architecture where A-port logic levels track VCCA (1.65V–5.5V) and B-port levels track VCCB (1.65V–5.5V); DIR input is referenced solely to VCCA. Its VCC isolation feature forces both ports into high-impedance when either VCCA or VCCB = GND.
It delivers asymmetric switching performance: tPLH/tPHL from A→B range 0.5–17.7ns depending on rail combinations; enable/disable times (tPHZ/tPLZ) are sub-20ns, supporting high-speed unidirectional and carefully sequenced bidirectional protocols without external OE control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - enables translation among 1.8V/2.5V/3.3V/5V logic domains without level-shifter families |
| Max Data Rate | 420Mbps (3.3V→5V) - supports USB 2.0 PHY signaling, high-speed sensor interfaces, and FPGA I/O expansion |
| IOH/IOL | ±24mA at 3.3V - drives standard CMOS loads with fast edge rates and minimal external buffering |
| Ioff | ±2µA max (–40°C to +85°C) - prevents backflow during partial power-down, critical for hot-swap and battery-backed subsystems |
| Propagation Delay | 0.5ns min / 17.7ns max (A↔B) - deterministic timing for synchronous data capture in microcontroller GPIO bridges |
| ESD Rating | ±2000V HBM - meets industrial IEC 61000-4-2 system-level ESD robustness requirements |
| Operating Temp | –40°C to +85°C - qualified for automotive cabin electronics, industrial HMIs, and telecom line cards |
Pinout & Package
SN74LVC1T45DBVRG4 uses the DBV (SOT-23-6) package: 2.9mm × 2.8mm body, 0.95mm max height, gull-wing leads, JEDEC MO-178AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | Power supply for A port and DIR input | Defines A-port logic thresholds and DIR reference; must be stable before signal assertion |
| GND | Digital ground reference | Common return for both rails; requires low-inductance connection to minimize noise coupling |
| A | Bidirectional I/O port A | Signal path tied to VCCA domain; output level swings 0–VCCA, input threshold ~VCCA×0.35/0.65 |
| B | Bidirectional I/O port B | Signal path tied to VCCB domain; input threshold depends on VCCB, not VCCA |
| DIR | Direction control input | Low = B→A data flow; high = A→B flow; referenced only to VCCA, independent of VCCB |
| VCCB | Power supply for B port | Defines B-port output swing and input thresholds; isolated from VCCA sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail operation | Independent 1.65V–5.5V supplies on VCCA and VCCB allow arbitrary voltage node pairing (e.g., 1.8V↔3.3V, 2.5V↔5V) |
| VCC isolation | Automatic high-Z on both ports if either VCCA or VCCB = GND - eliminates need for external power-good sequencing logic |
| Ioff partial-power-down support | Sub-2µA leakage per pin at full temperature range - enables safe integration into battery-powered subsystems with dynamic rail shutdown |
| NanoFree™ packaging | Diesize-as-package (SOT-23-6) reduces footprint by >50% vs. standard SOT-23 - ideal for wearables and ultra-dense IoT modules |
| Glitch-free power sequencing | No defined ramp order or rate required for VCCA/VCCB - prevents false logic transitions during power-up/down in multi-rail systems |
Applications
| Industrial PLC I/O Expansion | Automotive Infotainment Interface |
|---|---|
Use Scenario: Bridging 3.3V microcontroller GPIO to legacy 5V sensor inputs and actuators in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level translator with DIR-controlled direction; enables real-time analog/digital I/O sampling without voltage-domain conflict. Use Value: Eliminates discrete resistor-divider networks and saves PCB area while maintaining 420Mbps headroom for future firmware upgrades. | Use Scenario: Interfacing 1.8V camera module outputs to 3.3V image processor inputs in rear-view camera systems. IC Role / Device Role / Timing Role: Unidirectional A→B translator (DIR = high); provides clean 1.8V-to-3.3V signal integrity with <10ns propagation delay. Use Value: Meets automotive video latency requirements (<1ms end-to-end) and withstands under-hood thermal cycling (–40°C to +105°C ambient). |
| Wearable Health Monitor Sensor Hub | Telecom Baseband Processor Bridge |
Use Scenario: Connecting ultra-low-power 1.8V biometric sensors (ECG, SpO₂) to 2.5V MCU in compact wearable form factors. IC Role / Device Role / Timing Role: Low-leakage bidirectional translator with Ioff support; DIR toggled only during sensor mode changes. Use Value: Reduces standby current by >90% vs. active translators; NanoFree™ package fits within 2.5mm × 2.5mm board area budget. | Use Scenario: Level-shifting between 5V legacy baseband ASIC control lines and 3.3V FPGA configuration interface in small-cell radio units. IC Role / Device Role / Timing Role: Unidirectional B→A translator (DIR = low); handles JTAG, SPI, and reset signaling with glitch-free sequencing. Use Value: Avoids timing violations during FPGA reconfiguration; VCC isolation prevents latch-up when 5V ASIC powers down mid-operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXB0101DGSR | Auto-direction sensing (no DIR pin); lower drive (±2mA); higher ICC (10µA typ) | Suitable for open-drain or push-pull buses with automatic direction detection; not for DIR-controlled synchronous protocols | Select when eliminating control logic overhead is prioritized over drive strength and leakage |
| SN74AVC1T45DBVR | Higher speed (500Mbps), lower VIL/VIH thresholds, same pinout/package | Optimized for 1.2V/1.5V domains; requires tighter supply tolerance (1.2V–3.6V); not 5V-tolerant | Select for next-gen low-voltage SoC interconnects where 5V compatibility is unnecessary |
Compared with TXB0101DGSR and SN74AVC1T45DBVR, the SN74LVC1T45DBVRG4 uniquely balances 5V tolerance, ±24mA drive, and sub-4µA ICC - making it optimal for mixed-voltage industrial and automotive designs requiring robustness and layout simplicity.
Availability
SN74LVC1T45DBVRG4 is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, wearable health monitors, and telecom baseband processors requiring stable component supply and long-term production continuity.
Supply support for SN74LVC1T45DBVRG4 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- and power-constrained applications - especially where mixed-voltage interoperability and robust power sequencing are critical.
FAQ
What voltage ranges can SN74LVC1T45DBVRG4 translate between?
The SN74LVC1T45DBVRG4 supports translation between any two voltage domains from 1.65V to 5.5V - including 1.8V↔2.5V, 1.8V↔3.3V, 1.8V↔5V, 2.5V↔3.3V, 2.5V↔5V, and 3.3V↔5V - with both VCCA and VCCB independently configurable across that full range. The SN74LVC1T45DBVRG4 does not require matching supply voltages and maintains valid logic thresholds regardless of rail pairing.
How does the DIR pin function on SN74LVC1T45DBVRG4?
The DIR pin on SN74LVC1T45DBVRG4 is referenced exclusively to VCCA and controls data direction: logic high enables A→B transmission, logic low enables B→A transmission. It has no dependency on VCCB voltage. The SN74LVC1T45DBVRG4 requires DIR to be driven to a valid VIH or VIL level (per VCCA) at all times - floating or slow-transitioning DIR signals may cause excessive ICC or undefined output states.
Does SN74LVC1T45DBVRG4 support partial power-down operation?
Yes, SN74LVC1T45DBVRG4 supports partial power-down via its Ioff feature: when either VCCA or VCCB is at 0V, all I/Os enter high-impedance with leakage limited to ±2µA (–40°C to +85°C). This prevents current backflow into powered-down sections of the system. The SN74LVC1T45DBVRG4 also features VCC isolation, forcing both ports to high-Z if either supply drops to GND - a hardware-enforced safety mechanism.
What is the maximum data rate supported by SN74LVC1T45DBVRG4?
The SN74LVC1T45DBVRG4 supports up to 420Mbps when translating from 3.3V to 5V, 210Mbps when translating to 3.3V, 140Mbps to 2.5V, and 75Mbps to 1.8V. These rates are characterized across temperature and voltage combinations per TI's SCES515N datasheet. The SN74LVC1T45DBVRG4 achieves this using optimized output drivers and low-capacitance NanoFree™ packaging, not protocol-specific acceleration.
Which package type is used by SN74LVC1T45DBVRG4?
SN74LVC1T45DBVRG4 uses the DBV package: a 6-pin SOT-23 variant measuring 2.9mm × 2.8mm with gull-wing leads, RoHS-compliant, and compatible with standard surface-mount assembly processes. This is distinct from DCK (SC70), DRL (SOT), DPK (USON), or YZP (DSBGA) variants - the "DBVRG4" suffix explicitly denotes the DBV package with green molding compound and Pb-free finish.
SN74LVC1T45DBVRG4 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
SN74LVC1T45DBVRG4 FAQ
1.How can I place an order for SN74LVC1T45DBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC1T45DBVRG4 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 SN74LVC1T45DBVRG4 reliable?
The price and inventory of SN74LVC1T45DBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC1T45DBVRG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC1T45DBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC1T45DBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC1T45DBVRG4?
SN74LVC1T45DBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC1T45DBVRG4 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 SN74LVC1T45DBVRG4?
For technical support, including SN74LVC1T45DBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC1T45DBVRG4 requirements.
6.How does Aetrix verify that SN74LVC1T45DBVRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC1T45DBVRG4 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 SN74LVC1T45DBVRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC1T45DBVRG4?
All SN74LVC1T45DBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC1T45DBVRG4, 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 SN74LVC1T45DBVRG4 part is unused and in its original packaging.
Return procedure for SN74LVC1T45DBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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