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Texas Instruments SN74LVC2T45DCUTE4
- Part No.:
- SN74LVC2T45DCUTE4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC2T45DCUTE4.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
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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 configurable direction control (DIR referenced to VCCA), ±24-mA drive at 3.3 V, 4-μA max ICC, and VCC isolation. It is used in mixed-voltage I²C, UART, and GPIO interfacing between microcontrollers and peripherals.
For engineers reviewing the SN74LVC2T45 datasheet, SN74LVC2T45 pinout, SN74LVC2T45 application, or SN74LVC2T45 equivalent, key selection criteria include dual-rail supply flexibility (VCCA/VCCB = 1.65–5.5 V), directional control logic referencing, high-speed capability up to 420 Mbps (3.3 V → 5 V), Ioff-enabled partial-power-down support, 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. Each port (A1/A2 and B1/B2) operates independently under its own supply rail, enabling true level-shifting without external biasing or pull-up networks. The device maintains functional integrity across all valid VCCA/VCCB combinations within 1.65 V–5.5 V.
Its Ioff circuitry disables outputs during power-down, limiting leakage to ±2 μA per pin, while VCC isolation forces both ports into high-impedance state if either VCCA or VCCB is at GND. Propagation delays range from 0.5 ns to 37.4 ns depending on supply pair and signal direction, supporting timing-critical interfaces like high-speed GPIO and serial buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65 V to 5.5 V each - enables translation among 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without redesign. |
| Max Data Rate | 420 Mbps (3.3 V → 5 V) - supports high-speed digital interface bridging including fast UART and SPI clock domains. |
| Output Drive | ±24 mA at 3.3 V - provides robust edge rates into 50-Ω loads and drives multiple CMOS inputs without buffering. |
| ICC (max) | 4 μA - ensures ultra-low static power for battery-powered and always-on subsystems. |
| Ioff | ±2 μA - prevents backflow current during partial power-down, critical for hot-swap and system-level power sequencing. |
| ESD Rating | ±4000 V HBM - meets industrial-grade ESD immunity requirements without external protection diodes. |
| Operating Temp | –40 °C to +85 °C - qualified for extended industrial temperature operation in embedded and automotive gateway applications. |
Pinout & Package
The SN74LVC2T45 is available in DCT (SM8, 8-pin), DCU (VSSOP, 8-pin), and YZP (DSBGA, 8-pin) packages. This listing applies to the DCT variant (2.95 mm × 4 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply rail | Powers A1/A2 I/Os and DIR input; sets A-port logic thresholds and output swing. |
| A1 (Pin 2) | A-port data I/O | Bidirectional signal path referenced to VCCA; must be driven or terminated to avoid floating states. |
| A2 (Pin 3) | A-port data I/O | Independent second channel with identical VCCA-referenced behavior as A1. |
| GND (Pin 4) | Ground reference | Common return for both supply rails; required for stable noise margin and ESD path integrity. |
| DIR (Pin 5) | Direction control input | High = A→B data flow; Low = B→A; referenced to VCCA, not VCCB. |
| B2 (Pin 6) | B-port data I/O | Bidirectional signal path referenced to VCCB; threshold and drive strength scale with VCCB. |
| B1 (Pin 7) | B-port data I/O | Independent second channel with identical VCCB-referenced behavior as B2. |
| VCCB (Pin 8) | B-port supply rail | Powers B1/B2 I/Os; defines B-port logic levels and output voltage compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Enables interoperability between heterogeneous voltage domains (e.g., 1.8 V MCU ↔ 3.3 V sensor) without external level-shifters or resistive networks. |
| VCC isolation | Guarantees high-impedance state on both ports when either VCCA or VCCB is grounded - eliminates risk of latch-up or bus contention during power sequencing. |
| Ioff partial-power-down | Prevents damaging back-current when one side is powered off; allows safe integration into systems with staggered supply activation. |
| NanoFree™ packaging | Supports ultra-compact PCB layouts (e.g., DCT: 2.95 mm × 4 mm) while maintaining thermal performance and manufacturability in fine-pitch SMT processes. |
| Glitch-free supply sequencing | Eliminates false transitions on I/Os during ramp-up/ramp-down of VCCA or VCCB - avoids spurious resets or misreads in connected peripherals. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Interfacing a 1.8-V I²C temperature sensor to a 3.3-V microcontroller in a factory automation PLC. IC Role / Device Role / Timing Role: Bidirectional level translator for SDA/SCL lines, preserving I²C timing budgets and open-drain behavior. Use Value: Eliminates need for discrete MOSFET translators or pull-up resistor reconfiguration, reducing BOM count and layout area. |
Use Scenario: Connecting a 5-V CAN transceiver's status pins to a 3.3-V body controller MCU GPIO bank. IC Role / Device Role / Timing Role: Unidirectional voltage translator (DIR fixed) for fault reporting signals with precise VIH/VIL thresholds aligned to both rails. Use Value: Ensures reliable logic-level recognition across supply domains while meeting automotive EMC and thermal derating requirements. |
| Portable Consumer Device | Enterprise SSD Controller |
|
Use Scenario: Bridging a 2.5-V eMMC host controller to a 1.8-V NAND flash memory in a tablet design. IC Role / Device Role / Timing Role: Dual-bit bidirectional translator for CMD/DAT lines, supporting HS200 mode timing margins. Use Value: Enables use of lower-voltage, lower-power NAND without sacrificing host controller compatibility or signal integrity. |
Use Scenario: Level-shifting PCIe-side management signals (e.g., PERST#, CLKREQ#) between a 3.3-V FPGA and 1.8-V NVMe controller ASIC. IC Role / Device Role / Timing Role: Direction-controlled translator ensuring sub-10-ns propagation delay skew across both bits for synchronous assertion. Use Value: Maintains PCIe link training reliability and reduces timing closure effort versus discrete solutions. |
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); supports 1.2 V–3.6 V only. | Best for low-speed, low-power I²C/SPI where direction is predictable and drive demand is modest. | Choose TXS0102DCUR only when automatic direction detection is required and VCCB ≤ 3.6 V; not suitable for 5-V domains or high-drive needs. |
| SN74AVC2T245RSWR | Higher speed (500 Mbps), lower propagation delay (0.25 ns typ), but no VCC isolation or Ioff. | Targeted at high-performance computing interconnects where power sequencing is tightly controlled and leakage is less critical. | Choose SN74AVC2T245RSWR for maximum throughput in stable, fully powered systems; avoid where partial-power-down or supply sequencing is present. |
Compared with TXS0102DCUR and SN74AVC2T245RSWR, the SN74LVC2T45 uniquely balances wide voltage range (1.65–5.5 V), VCC isolation, Ioff, and moderate speed-making it the preferred choice for industrial and automotive designs requiring robustness across dynamic power states.
Availability
SN74LVC2T45 is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control, portable consumer device, and enterprise SSD controller applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature and voltage corners.
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 leader delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog, power management, and interface ICs.
The SN74LVC2T45 belongs to TI's LVC logic family, engineered for low-voltage, high-speed, mixed-supply interfacing in space- and power-constrained embedded systems across industrial, automotive, and communications markets.
FAQ
What voltage ranges does the SN74LVC2T45 support on VCCA and VCCB?
The SN74LVC2T45 supports independent supply voltages from 1.65 V to 5.5 V on both VCCA and VCCB. This enables translation between common logic domains such as 1.8 V ↔ 3.3 V, 2.5 V ↔ 5 V, or 3.3 V ↔ 5 V. Operation outside this range violates absolute maximum ratings and may cause permanent damage to the SN74LVC2T45.
How does the DIR pin function in the SN74LVC2T45?
The DIR pin controls data direction and is referenced to VCCA-not VCCB. When DIR is HIGH (≥ VCCA × 0.65), data flows from A-port (A1/A2) to B-port (B1/B2). When DIR is LOW (≤ VCCA × 0.35), data flows from B-port to A-port. Floating DIR is undefined and must be actively driven; the SN74LVC2T45 does not include internal pull-up/down on DIR.
Does the SN74LVC2T45 support partial-power-down operation?
Yes, the SN74LVC2T45 supports partial-power-down via its Ioff feature. When either VCCA or VCCB is at 0 V, the Ioff circuitry disables all outputs, limiting leakage current to ±2 μA per I/O pin. This prevents backflow current and protects upstream/downstream devices during staggered power sequencing-a key requirement in the SN74LVC2T45's target applications.
What is the maximum data rate achievable with the SN74LVC2T45?
The maximum data rate of the SN74LVC2T45 is 420 Mbps when translating from 3.3 V to 5 V (VCCA = 3.3 V, VCCB = 5 V). Rates decrease with other supply combinations: 210 Mbps (to 3.3 V), 140 Mbps (to 2.5 V), and 75 Mbps (to 1.8 V). These values reflect guaranteed AC performance under recommended operating conditions for the SN74LVC2T45.
Which package options are available for the SN74LVC2T45?
The SN74LVC2T45 is offered in three package variants: DCT (SM8, 8-pin, 2.95 mm × 4 mm), DCU (VSSOP, 8-pin, 2 mm × 3.1 mm), and YZP (DSBGA, 8-pin, 1.5 mm × 0.5 mm). All share identical pinout and electrical specifications; selection depends on board density, thermal requirements, and assembly capability. The DCT variant is the standard offering referenced in most SN74LVC2T45 design guides.
SN74LVC2T45DCUTE4 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)
SN74LVC2T45DCUTE4 FAQ
1.How can I place an order for SN74LVC2T45DCUTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC2T45DCUTE4 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 SN74LVC2T45DCUTE4 reliable?
The price and inventory of SN74LVC2T45DCUTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC2T45DCUTE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC2T45DCUTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC2T45DCUTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC2T45DCUTE4?
SN74LVC2T45DCUTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC2T45DCUTE4 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 SN74LVC2T45DCUTE4?
For technical support, including SN74LVC2T45DCUTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC2T45DCUTE4 requirements.
6.How does Aetrix verify that SN74LVC2T45DCUTE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC2T45DCUTE4 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 SN74LVC2T45DCUTE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC2T45DCUTE4?
All SN74LVC2T45DCUTE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC2T45DCUTE4, 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 SN74LVC2T45DCUTE4 part is unused and in its original packaging.
Return procedure for SN74LVC2T45DCUTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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