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Texas Instruments SN74LVC1T45DBVTG4
- Part No.:
- SN74LVC1T45DBVTG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC1T45DBVTG4.pdf
- Description:
- IC TRANSLATOR BIDIR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,231
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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 3-state outputs, ±24mA drive at 3.3V, 4µA max ICC, and VCC isolation. It serves as a configurable interface between mismatched logic families in portable electronics and industrial control systems.
For engineers reviewing the SN74LVC1T45 datasheet, SN74LVC1T45 pinout, SN74LVC1T45 application, or SN74LVC1T45 equivalent, key selection criteria include dual-rail supply flexibility (VCCA/VCCB independent), Ioff partial-power-down support, DIR-controlled directionality, and verified 420Mbps data rate for 3.3V→5V translation.
Technical Context
The SN74LVC1T45 implements asynchronous bidirectional translation via a DIR-controlled noninverting path: high DIR enables A→B transmission; low DIR enables B→A. Its input circuitry is referenced to VCCA, while B-port thresholds track VCCB - enabling true dual-voltage-domain operation without level-shifter biasing.
VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB = GND, and Ioff limits leakage to ±2µA over –40°C to +85°C, supporting safe partial power-down in mixed-supply systems with staggered rail sequencing.
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 external components |
| Max Data Rate | 420Mbps (3.3V→5V) - enables high-speed interconnect between legacy and modern logic interfaces |
| Output Drive | ±24mA at 3.3V - sufficient to drive standard CMOS loads and moderate PCB traces without buffering |
| ICC (max) | 4µA - ultra-low static power ideal for battery-powered and always-on subsystems |
| Ioff Leakage | ±2µA (–40°C to +85°C) - prevents backflow during power-down, protecting upstream/downstream ICs |
| ESD Rating | ±2000V HBM - meets industrial handling requirements without additional protection circuitry |
| Propagation Delay | 0.5ns to 17.7ns (varies by VCCA/VCCB combo) - deterministic timing for synchronous and asynchronous protocols |
Pinout & Package
SN74LVC1T45DBVTG4 uses the DBV (SOT-23-6) package: 2.9mm × 2.8mm, 6-pin surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | Power supply for A port and DIR input | Defines logic thresholds and output swing for A-side; DIR is referenced to this rail |
| GND | Common reference ground | Single ground connection required; no separate analog/digital GND needed |
| A | Bidirectional I/O port A | Input threshold and output voltage level determined by VCCA; connects to System-1 bus |
| B | Bidirectional I/O port B | Input threshold and output voltage level determined by VCCB; connects to System-2 bus |
| DIR | Direction control input | Low = B→A data flow; high = A→B data flow; referenced to VCCA, not VCCB |
| VCCB | Power supply for B port | Independent of VCCA; enables true dual-supply translation without shared rail constraints |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.65V–5.5V supplies on VCCA and VCCB enable interoperability between 1.8V, 2.5V, 3.3V, and 5V logic domains |
| VCC isolation | Both A and B ports automatically enter high-Z if either VCCA or VCCB = GND - eliminates risk of bus contention during power sequencing |
| Ioff partial-power-down | Outputs and inputs float to high-Z with <±2µA leakage when powered down - safe for hot-swap and multi-rail standby modes |
| Glitch-free supply sequencing | No output glitches occur regardless of VCCA/VCCB ramp order or rate - removes need for complex power-up coordination |
| NanoFree™ packaging | Dies-as-package construction reduces footprint and thermal resistance (RθJA = 215.1°C/W for DBV) - improves board density and thermal performance |
Applications
| USB Peripheral Interface | Industrial Sensor Hub |
|---|---|
Use Scenario: Connecting a 3.3V microcontroller to a 5V USB transceiver IC in portable diagnostic equipment. IC Role / Device Role / Timing Role: Bidirectional level translator managing D+ and D− lines with precise edge control and no bus contention. Use Value: Eliminates discrete resistor networks or dedicated level-shifter ICs; supports full-speed USB signaling up to 12 Mbps with verified 420Mbps headroom. | Use Scenario: Interfacing 1.8V MEMS sensors and 5V PLC I/O modules within a factory-floor sensor aggregation node. IC Role / Device Role / Timing Role: Voltage-domain bridge enabling real-time sensor data transfer across isolated supply domains with glitch-free startup. Use Value: VCC isolation prevents latch-up during sensor module hot-plug; Ioff protects 1.8V sensor outputs during 5V system reset sequences. |
| Automotive Infotainment Link | Enterprise SSD Controller Bridge |
Use Scenario: Translating control signals between a 2.5V automotive SoC and 3.3V display driver in a dashboard cluster. IC Role / Device Role / Timing Role: Direction-controlled bus transceiver synchronizing command/status handshaking with sub-8ns propagation delay. Use Value: Meets AEC-Q100 Grade 2 temperature range (–40°C to +105°C) with validated ESD robustness (±2000V HBM). | Use Scenario: Enabling communication between a 1.2V NVMe controller and 1.8V NAND flash memory in enterprise SSD firmware update paths. IC Role / Device Role / Timing Role: Low-leakage bidirectional translator maintaining signal integrity during firmware write cycles with partial power-down support. Use Value: 4µA max ICC and ±2µA Ioff reduce standby current in power-gated update modes without compromising data reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXB0101RGYR | Auto-direction sensing (no DIR pin); lower drive (±2mA); 1.2V–3.6V only | Suitable for low-speed, low-current I²C/SPI; unsuitable for high-drive or >3.6V translation | Select SN74LVC1T45 for DIR-controlled deterministic direction, higher drive, and wider voltage range |
| SN74AVC1T45DBVR | Same pinout and function; enhanced speed (500Mbps), lower capacitance (Cio = 4.5pF vs 6pF), –40°C to +125°C | Drop-in upgrade for extended temperature or higher bandwidth needs; identical layout compatibility | Choose SN74AVC1T45DBVR only if operating above 85°C or requiring >420Mbps margin |
Compared with TXB0101RGYR, SN74LVC1T45 provides manual DIR control and 12× higher drive strength for driving capacitive buses; versus SN74AVC1T45DBVR, it offers cost-optimized performance for commercial-temperature designs without sacrificing pin compatibility or core functionality.
Availability
SN74LVC1T45DBVTG4 is available at Aetrix Electronics and suitable for industrial sensor hubs, automotive infotainment links, and enterprise SSD controller bridges requiring stable component supply and long-term production continuity.
Supply support for SN74LVC1T45DBVTG4 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 and signal chain technologies.
The SN74LVC1T45 belongs to TI's LVC logic family, designed specifically for low-voltage, low-power bidirectional level translation in space-constrained, multi-rail systems where supply sequencing independence and Ioff safety are critical.
FAQ
What is the maximum supported data rate for SN74LVC1T45DBVTG4 in a 3.3V-to-5V translation configuration?
The SN74LVC1T45DBVTG4 supports up to 420Mbps when translating signals from 3.3V to 5V, as specified in the official Texas Instruments datasheet SCES515N. This rating is measured under defined load and voltage conditions and represents the upper limit for reliable high-speed bidirectional communication without signal degradation.
Does SN74LVC1T45DBVTG4 require external pull-up resistors on the A or B ports?
No, SN74LVC1T45DBVTG4 does not require external pull-up resistors for basic operation - its CMOS inputs have negligible DC loading. However, in bidirectional configurations where bus contention must be avoided during direction switching, external pull-ups or bus-hold circuits may be used per TI application guidance (Section 8.2.2), but they are not inherent to SN74LVC1T45DBVTG4 functionality.
Can SN74LVC1T45DBVTG4 operate with VCCA = 1.8V and VCCB = 5V simultaneously?
Yes, SN74LVC1T45DBVTG4 is fully specified for simultaneous operation with VCCA = 1.8V and VCCB = 5V. The device supports all combinations within the 1.65V–5.5V range per rail, including 1.8V↔5V translation, with validated timing (e.g., tPLH = 1.4ns min, 7.2ns max) and drive capability per the Electrical Characteristics table.
How does the VCC isolation feature behave when VCCA = GND and VCCB = 3.3V on SN74LVC1T45DBVTG4?
When VCCA = GND and VCCB = 3.3V, the VCC isolation feature forces both A and B ports into high-impedance state regardless of DIR or input states. This behavior is guaranteed by design and verified in the Functional Description (Section 7.3.6), preventing current backflow and ensuring bus safety during asymmetric power-down sequences.
Is SN74LVC1T45DBVTG4 compatible with the SOT-23-6 footprint of SN74LVC1G125DBVR?
Yes, SN74LVC1T45DBVTG4 uses the DBV (SOT-23-6) package with identical 2.9mm × 2.8mm dimensions and pinout as SN74LVC1G125DBVR, but functional compatibility is not implied - SN74LVC1T45DBVTG4 is a bidirectional translator with DIR control, whereas SN74LVC1G125DBVR is a unidirectional buffer with OE. Pin-for-pin mechanical fit does not equate to electrical or functional interchangeability.
SN74LVC1T45DBVTG4 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
SN74LVC1T45DBVTG4 FAQ
1.How can I place an order for SN74LVC1T45DBVTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC1T45DBVTG4 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 SN74LVC1T45DBVTG4 reliable?
The price and inventory of SN74LVC1T45DBVTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC1T45DBVTG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC1T45DBVTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC1T45DBVTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC1T45DBVTG4?
SN74LVC1T45DBVTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC1T45DBVTG4 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 SN74LVC1T45DBVTG4?
For technical support, including SN74LVC1T45DBVTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC1T45DBVTG4 requirements.
6.How does Aetrix verify that SN74LVC1T45DBVTG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC1T45DBVTG4 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 SN74LVC1T45DBVTG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC1T45DBVTG4?
All SN74LVC1T45DBVTG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC1T45DBVTG4, 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 SN74LVC1T45DBVTG4 part is unused and in its original packaging.
Return procedure for SN74LVC1T45DBVTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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