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Texas Instruments SN74LVC1T45YZTR
- Part No.:
- SN74LVC1T45YZTR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC1T45YZTR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 6DSBGA
- 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 3-state outputs, VCC isolation, Ioff partial-power-down support, and ±24mA drive at 3.3V - used in low-pin-count interface bridging between mixed-voltage SoCs and peripherals.
For engineers reviewing the SN74LVC1T45 datasheet, SN74LVC1T45 pinout, SN74LVC1T45 application, or SN74LVC1T45 equivalent, key selection criteria include configurable dual-rail operation (VCCA/VCCB), DIR-controlled directionality, high-impedance fail-safe behavior during supply loss, and verified 420Mbps max data rate for 3.3V→5V translation.
Technical Context
The SN74LVC1T45 implements asynchronous bidirectional translation via a DIR-input-controlled path: high DIR enables A→B transmission; low DIR enables B→A transmission. Both A and B ports are always input-active, requiring defined logic levels to avoid excess ICCZ.
Its dual-rail architecture decouples VCCA (powers DIR and A port) and VCCB (powers B port), supporting independent 1.65V–5.5V supplies. The VCC isolation feature forces both ports into high-impedance when either VCCA or VCCB = GND, and Ioff limits leakage to ±2µA over temperature during power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - enables universal translation among 1.8V/2.5V/3.3V/5V system nodes without external level-shifters. |
| Max Data Rate | 420Mbps (3.3V→5V) - supports high-speed peripheral interconnects like UART, I²C pull-up adaptation, and GPIO expansion. |
| Output Drive | ±24mA at 3.3V - ensures robust signal integrity into 50Ω traces or capacitive loads up to 15pF with fast edge control. |
| Ioff Leakage | ±2µA max (–40°C to +85°C) - prevents backflow and bus contention during hot-swap or partial power-down sequences. |
| Propagation Delay | 0.5ns–17.7ns (varies by VCCA/VCCB pair) - guarantees sub-20ns latency for real-time control loops and synchronous handshaking. |
| ESD Rating | ±2000V HBM - meets industrial-grade handling requirements without additional protection circuitry. |
| ICC Quiescent | 4µA max - enables ultra-low-power operation in battery-backed or energy-harvesting sensor interfaces. |
Pinout & Package
SN74LVC1T45YZTR uses the YZP (DSBGA, 6-pin) package: 1mm × 0.5mm, bottom-terminal, wafer-level chip-scale design optimized for space-constrained portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A | Data I/O (VCCA-referenced) | Bi-directional signal terminal tracking VCCA; output voltage swing = 0 to VCCA, input threshold scales with VCCA. |
| B | Data I/O (VCCB-referenced) | Bi-directional signal terminal tracking VCCB; output voltage swing = 0 to VCCB, input threshold scales with VCCB. |
| DIR | Direction Control Input | Logic level referenced to VCCA; low = B→A data flow, high = A→B data flow; no internal pullup/down. |
| VCCA | Port-A Supply Rail | Powers A-port I/O circuitry and DIR input; must be stable before signal assertion to ensure valid direction control. |
| VCCB | Port-B Supply Rail | Powers B-port I/O circuitry; independent of VCCA - allows asymmetric voltage translation (e.g., 1.8V↔3.3V). |
| GND | Signal Reference Ground | Common return for both ports; must be low-impedance and shared with VCCA/VCCB return paths to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.65V–5.5V operation on VCCA and VCCB enables seamless interfacing across 1.8V, 2.5V, 3.3V, and 5V logic families. |
| VCC isolation | Automatic high-impedance state on both A and B ports if either VCCA or VCCB drops to GND - prevents bus lockup during supply sequencing faults. |
| Ioff partial-power-down | Input/output leakage ≤ ±2µA when powered down - eliminates current paths that could disrupt adjacent powered subsystems. |
| Glitch-free power sequencing | No required ramp order or timing between VCCA and VCCB - simplifies power management in multi-rail systems with staggered supply turn-on. |
| NanoFree™ packaging | DSBGA footprint (1mm × 0.5mm) eliminates leadframe parasitics and reduces board area by >50% vs. SOT-23 - ideal for wearables and compact modules. |
Applications
| Industrial Sensor Hub | Wearable MCU Interface |
|---|---|
Use Scenario: Interfacing a 1.8V MEMS sensor to a 3.3V host MCU over I²C or SPI with minimal pin count. IC Role / Device Role / Timing Role: Bidirectional level translator managing SDA/SCL or MOSI/MISO lines while preserving signal integrity and timing margins. Use Value: Eliminates need for discrete resistor-divider or active translators; supports 400kHz I²C Fast Mode and 10MHz SPI without added propagation delay. |
Use Scenario: Connecting a 5V legacy display driver to a 2.5V ultra-low-power wearable SoC. IC Role / Device Role / Timing Role: Unidirectional voltage translator (DIR fixed) converting control signals (RESET, CS) from 2.5V domain to 5V domain. Use Value: Enables direct integration without external level-shifting ICs; maintains <10ns propagation delay to preserve timing-critical reset assertion. |
| Automotive Body Controller | IoT Edge Gateway |
Use Scenario: Bridging a 3.3V CAN transceiver's GPIO status pins to a 5V microcontroller monitoring circuit. IC Role / Device Role / Timing Role: Single-line bidirectional translator for fault-reporting and configuration signals with fail-safe high-Z on supply loss. Use Value: VCC isolation ensures status lines float safely if either rail fails - preventing false fault triggers during brownout conditions. |
Use Scenario: Adapting 1.8V UART signals from an ESP32-WROOM module to a 3.3V RS-232 transceiver in a smart meter. IC Role / Device Role / Timing Role: Asynchronous serial level shifter supporting full-duplex communication at 921.6kbps. Use Value: Verified 210Mbps capability exceeds UART timing requirements; ±24mA drive ensures clean edges into RS-232 input capacitance. |
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); supports 1.2V–3.6V only. | Eliminates direction-control logic but unsuitable for 5V interfaces or high-drive loads. | Choose TXS0101DCUR only for low-speed, low-voltage, auto-direction applications where DIR pin routing is impractical. |
| SN74AVC1T45DBVR | Higher speed (500Mbps), same pinout/package; requires tighter layout due to 2.5V max VCC rating. | Not compatible with 5V systems; better for high-frequency 1.8V/2.5V/3.3V-only designs needing lower jitter. | Choose SN74AVC1T45DBVR when operating exclusively below 3.3V and requiring sub-10ns propagation with reduced switching noise. |
Compared with TXS0101DCUR and SN74AVC1T45DBVR, SN74LVC1T45YZTR uniquely balances 5V compatibility, ±24mA drive, and DIR-controlled deterministic direction - making it optimal for mixed-voltage industrial and automotive interfaces where supply flexibility and robustness outweigh auto-sensing convenience or marginal speed gains.
Availability
SN74LVC1T45YZTR is available at Aetrix Electronics and suitable for industrial sensor hubs, wearable MCU interfaces, automotive body controllers, and IoT edge gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC1T45YZTR 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 for industrial, automotive, and personal electronics markets.
The SN74LVC1T45 belongs to TI's LVC logic family, engineered for low-voltage bidirectional translation in space- and power-constrained systems - emphasizing configurability, fail-safe behavior, and compatibility across legacy and next-generation voltage domains.
FAQ
What voltage ranges does the SN74LVC1T45YZTR support on VCCA and VCCB?
The SN74LVC1T45YZTR supports independent supply voltages from 1.65V to 5.5V on both VCCA and VCCB. This allows translation between any combination of common logic rails - including 1.8V↔2.5V, 1.8V↔3.3V, 1.8V↔5V, 2.5V↔3.3V, 2.5V↔5V, and 3.3V↔5V - without external components. Each port's I/O thresholds and output swing scale directly with its respective supply.
How does the DIR pin control data direction in the SN74LVC1T45YZTR?
In the SN74LVC1T45YZTR, the DIR pin is referenced to VCCA and determines signal flow: a logic HIGH enables transmission from the A port to the B port; a logic LOW enables transmission from the B port to the A port. The A and B ports remain input-active regardless of DIR state, so undefined inputs must be avoided to prevent excessive ICCZ current.
Does the SN74LVC1T45YZTR support partial power-down operation?
Yes, the SN74LVC1T45YZTR supports partial power-down via its Ioff feature: when either VCCA or VCCB is at GND, all I/Os enter a high-impedance state with leakage limited to ±2µA (–40°C to +85°C). This prevents current backflow into powered rails and avoids bus contention during hot-swap or staged power sequencing.
What is the maximum data rate achievable with the SN74LVC1T45YZTR?
The SN74LVC1T45YZTR achieves 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 validated under specified load and voltage conditions and reflect guaranteed timing margins - not theoretical limits - ensuring reliable operation in real-world PCB environments.
Which package type is used by the SN74LVC1T45YZTR, and what are its key layout advantages?
The SN74LVC1T45YZTR uses the YZP package: a 6-pin DSBGA (Die Size Ball Grid Array) measuring 1.0mm × 0.5mm. Its wafer-level construction eliminates bond wires and leadframe inductance, reducing parasitic capacitance and improving high-frequency signal fidelity. The bottom-terminal layout simplifies routing in dense layouts and enables direct thermal coupling to PCB ground planes.
SN74LVC1T45YZTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 6-UFBGA, DSBGA
SN74LVC1T45YZTR FAQ
1.How can I place an order for SN74LVC1T45YZTR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC1T45YZTR 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 SN74LVC1T45YZTR reliable?
The price and inventory of SN74LVC1T45YZTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC1T45YZTR is usually 5 days.
3.What payment methods are accepted for SN74LVC1T45YZTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC1T45YZTR transactions.
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4.How is shipping managed for SN74LVC1T45YZTR?
SN74LVC1T45YZTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC1T45YZTR 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 SN74LVC1T45YZTR?
For technical support, including SN74LVC1T45YZTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC1T45YZTR requirements.
6.How does Aetrix verify that SN74LVC1T45YZTR is sourced from the original manufacturer or authorized distributors?
All SN74LVC1T45YZTR 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 SN74LVC1T45YZTR meets industry standards.
7.What is the process for return or replacement of SN74LVC1T45YZTR?
All SN74LVC1T45YZTR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC1T45YZTR, 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 SN74LVC1T45YZTR part is unused and in its original packaging.
Return procedure for SN74LVC1T45YZTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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