My Inquiry
My Account
Texas Instruments SN74LVC2T45YEPR
- Part No.:
- SN74LVC2T45YEPR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC2T45YEPR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,184
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVC2T45 from Texas Instruments is a dual-bit, dual-supply noninverting bus transceiver enabling bidirectional voltage-level translation between 1.65 V and 5.5 V domains. It supports independent A-port (VCCA-referenced) and B-port (VCCB-referenced) operation, features ±24-mA drive at 3.3 V, 4-μA maximum ICC, and VCC isolation for robust partial-power-down behavior. It is used in mixed-voltage I/O interfacing between microcontrollers and peripherals operating at 1.8 V, 2.5 V, 3.3 V, or 5 V.
For engineers reviewing the SN74LVC2T45 datasheet, SN74LVC2T45 pinout, SN74LVC2T45 application, or SN74LVC2T45 equivalent, key selection considerations include configurable dual-rail supply range (1.65–5.5 V per port), direction-controlled data flow (DIR referenced to VCCA), Ioff-enabled power-down safety, high-speed capability up to 420 Mbps (3.3 V → 5 V), and NanoFree™ package compatibility with space-constrained PCB layouts.
Technical Context
The SN74LVC2T45 implements asynchronous bidirectional translation using separate VCCA and VCCB rails, where DIR input-referenced solely to VCCA-controls signal direction: high enables A→B transmission, low enables B→A. Both ports maintain full logic-level compatibility across 1.65 V to 5.5 V, supporting translation among 1.8 V, 2.5 V, 3.3 V, and 5 V nodes without external components.
VCC isolation ensures both A and B ports enter high-impedance state if either VCCA or VCCB is at GND, while Ioff circuitry limits leakage to ±2 µA when powered down. Propagation delays are voltage-dependent: tPLH/tPHL range from 0.5 ns (5 V → 5 V) to 17.7 ns (1.8 V → 1.8 V), and enable/disable times (tPHZ/tPLZ) are as low as 1.4 ns under optimal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA / VCCB) | 1.65 V to 5.5 V each - enables translation between any pair of common logic voltages (1.8 V, 2.5 V, 3.3 V, 5 V) without level-shifters or resistors |
| Max Data Rate | 420 Mbps (3.3 V → 5 V) - supports high-speed interface bridging such as USB PHY control lines or FPGA-to-ASIC interconnects |
| Output Drive | ±24 mA at 3.3 V - provides sufficient current to drive moderate capacitive loads and multiple CMOS inputs without buffering |
| ICC (max) | 4 µA - ultra-low static power enables use in battery-backed or always-on subsystems with strict quiescent current budgets |
| Ioff | ±2 µA - prevents backflow current during partial power-down, protecting unpowered ICs connected to A or B ports |
| ESD Rating (HBM) | ±4000 V - meets industrial-grade ESD robustness requirements for board-level handling and end-equipment reliability |
| Operating Temp | –40 °C to +85 °C - qualified for extended temperature operation in industrial and automotive cabin applications |
Pinout & Package
SN74LVC2T45 is available in three surface-mount packages: DCT (SM8, 2.95 mm × 4 mm), DCU (VSSOP-8, 2 mm × 3.1 mm), and YZP (DSBGA-8, 1.5 mm × 0.5 mm). All variants share identical pin functionality and electrical behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply rail | References A1, A2, and DIR inputs; sets A-port logic thresholds and output swing; must be 1.65–5.5 V |
| A1, A2 | Bidirectional A-port I/Os | Transmit/receive data on A side; logic levels and drive strength referenced to VCCA |
| GND | Common ground reference | Required return path for both supply rails; must be low-impedance and shared with system ground |
| DIR | Direction control input | Referenced to VCCA; high = A→B data flow, low = B→A; no internal pull-up/down |
| B2, B1 | Bidirectional B-port I/Os | Transmit/receive data on B side; logic levels and drive strength referenced to VCCB |
| VCCB | B-port supply rail | References B1 and B2; sets B-port logic thresholds and output swing; must be 1.65–5.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail operation | Independent VCCA and VCCB supplies (1.65–5.5 V each) allow arbitrary voltage node pairing - e.g., 1.8 V MCU ↔ 3.3 V sensor, or 2.5 V FPGA ↔ 5 V display driver |
| VCC isolation | Automatic high-Z on both ports if either VCCA or VCCB = GND - eliminates risk of latch-up or damage during asymmetric power sequencing |
| Ioff support | Enables safe partial-power-down mode: all I/Os enter high-impedance state with <±2 µA leakage, preventing backdrive into unpowered subsystems |
| High-speed translation | Up to 420 Mbps (3.3 V → 5 V) enables use in timing-critical interfaces like PCIe configuration buses, MIPI control links, or high-frequency GPIO expansion |
| NanoFree™ packaging | YZP (DSBGA-8) option measures only 1.5 mm × 0.5 mm - ideal for ultra-compact wearables, hearing aids, and space-constrained IoT edge nodes |
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, maintaining I²C timing compliance across voltage domains. Use Value: Eliminates need for discrete MOSFET translators or resistor-based solutions, reducing BOM count and layout area while supporting standard 100-kHz/400-kHz I²C speeds. |
Use Scenario: Connecting a 5-V LIN transceiver to a 2.5-V CAN controller MCU in a vehicle door module. IC Role / Device Role / Timing Role: Unidirectional voltage translator for wake-up signal routing, with DIR held low to route LIN_WKUP from 5 V to 2.5 V domain. Use Value: Ensures reliable wake detection under cold-cranking conditions (low VCCB), leveraging VCC isolation to prevent false triggers during power ramp-up. |
| Consumer Wearable Display Link | Enterprise SSD Controller Interface |
Use Scenario: Bridging a 3.3-V application processor to a 1.8-V OLED display driver in a smartwatch. IC Role / Device Role / Timing Role: Dual-bit translator for display reset (RST) and chip-select (CS) signals, configured with DIR tied high for A→B flow. Use Value: Supports fast signal edges (<7 ns tPLH at 3.3 V → 1.8 V) required for tight display initialization timing, with nano-package footprint minimizing trace length. |
Use Scenario: Level-shifting command/address lines between a 3.3-V NVMe controller and 1.2-V NAND flash in an enterprise SSD. IC Role / Device Role / Timing Role: Bidirectional translator for status and configuration registers, with DIR toggled dynamically during read/write cycles. Use Value: Enables direct connection without timing margin loss - propagation delay variation <1 ns across VCCB = 1.2 V to 3.3 V ensures setup/hold compliance at 200-MHz bus rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0102DCUR | Auto-direction sensing (no DIR pin); lower drive (±8 mA at 3.3 V); higher ICC (10 µA typical) | Suitable for open-drain buses (I²C, SMBus); not recommended for push-pull or high-speed parallel interfaces | Select when direction is predictable and automatic sensing simplifies control logic; avoid for >100 Mbps or high-drive needs. |
| SN74AVC2T245RSWR | Higher speed (500 Mbps), lower propagation delay (0.25 ns min), but narrower supply range (1.2–3.6 V per rail) | Optimized for sub-3.3-V systems (e.g., mobile SoCs); incompatible with 5-V domains or legacy industrial 5-V peripherals | Choose for next-gen low-voltage designs requiring maximum bandwidth; reject if 5-V interface or wide voltage flexibility is required. |
Compared with TXS0102DCUR and SN74AVC2T245RSWR, SN74LVC2T45 uniquely balances wide voltage range (1.65–5.5 V), manual DIR control for deterministic timing, and 420-Mbps capability - making it the preferred choice for mixed-voltage industrial, automotive, and legacy-compatible embedded systems.
Availability
SN74LVC2T45 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, consumer wearable display links, and enterprise SSD controller interfaces requiring stable component supply, long-term lifecycle assurance, 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 company delivering analog and embedded processing solutions, with leadership in precision analog, power management, and interface technologies since 1930.
The SN74LVC2T45 belongs to TI's LVC logic family, designed specifically for low-voltage, mixed-signal system interfacing where robust level translation, power-aware operation, and broad voltage compatibility are critical in industrial, automotive, and computing applications.
FAQ
What is the function of the DIR pin on the SN74LVC2T45?
The DIR (direction) pin on the SN74LVC2T45 is a digital control input referenced to VCCA that determines data flow direction: when DIR = HIGH, data passes from the A-port (A1/A2) to the B-port (B1/B2); when DIR = LOW, data flows from B to A. It does not affect power sequencing or enable/disable timing - those are governed by VCCA/VCCB presence and Ioff behavior. The SN74LVC2T45 requires an external logic signal or microcontroller GPIO to drive DIR.
Can SN74LVC2T45 translate between 1.2 V and 3.3 V logic levels?
No - SN74LVC2T45 is not rated for 1.2 V operation. Its absolute minimum supply voltage is 1.65 V for both VCCA and VCCB, and its recommended operating range starts at 1.65 V. Attempting to operate VCCA or VCCB below 1.65 V may result in undefined logic thresholds, increased propagation delay, or failure to meet VIH/VIL specifications. For 1.2 V translation, consider SN74AVC2T245 or TXB0102 instead.
Does SN74LVC2T45 support hot insertion or live swapping between powered systems?
Yes - SN74LVC2T45 supports hot insertion via its VCC isolation and Ioff features. If either VCCA or VCCB is disconnected while the other remains powered, both ports automatically enter high-impedance state with leakage <±2 µA, preventing backdrive or latch-up. This allows safe connection/disconnection of peripheral boards (e.g., add-on sensors or displays) without powering down the host system - a key requirement in modular industrial controllers.
What is the maximum capacitive load SN74LVC2T45 can drive reliably?
SN74LVC2T45 maintains specified timing (e.g., tPLH ≤ 7.2 ns at 3.3 V → 3.3 V) up to 15 pF load capacitance, as defined in the test conditions of Figure 6-1. Driving >15 pF increases propagation delay nonlinearly and may cause ringing due to its ±24-mA drive strength. For loads exceeding 15 pF, add series termination (22–33 Ω) near the driver or use a buffer stage - the SN74LVC2T45 itself does not include slew-rate control or programmable drive strength.
Is SN74LVC2T45 compatible with I²C open-drain signaling?
No - SN74LVC2T45 is a push-pull transceiver and is not designed for open-drain buses like I²C. Its outputs actively drive HIGH and LOW, which would conflict with I²C's wired-AND topology and cause bus contention. For I²C level shifting, TI recommends TXS0102 (auto-sensing) or PCA9306 (dual-channel, passive). Using SN74LVC2T45 on I²C lines risks damaging devices or corrupting communication.
SN74LVC2T45YEPR 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:
- 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-XFBGA, DSBGA
SN74LVC2T45YEPR FAQ
1.How can I place an order for SN74LVC2T45YEPR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC2T45YEPR 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 SN74LVC2T45YEPR reliable?
The price and inventory of SN74LVC2T45YEPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC2T45YEPR is usually 5 days.
3.What payment methods are accepted for SN74LVC2T45YEPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC2T45YEPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC2T45YEPR?
SN74LVC2T45YEPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC2T45YEPR 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 SN74LVC2T45YEPR?
For technical support, including SN74LVC2T45YEPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC2T45YEPR requirements.
6.How does Aetrix verify that SN74LVC2T45YEPR is sourced from the original manufacturer or authorized distributors?
All SN74LVC2T45YEPR 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 SN74LVC2T45YEPR meets industry standards.
7.What is the process for return or replacement of SN74LVC2T45YEPR?
All SN74LVC2T45YEPR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC2T45YEPR, 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 SN74LVC2T45YEPR part is unused and in its original packaging.
Return procedure for SN74LVC2T45YEPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVC2T45YEPR Tags
-
74LVC1T45GW,125
Nexperia USA Inc.
-
74LVCH2T45DC,125
Nexperia USA Inc.
-
SN74LVC1T45DBVR
Texas Instruments
-
SN74LVC1T45DRLR
Texas Instruments
-
SN74LVC1T45DPKR
Texas Instruments
-
SN74LVC2T45DCTR
Texas Instruments
-
74LVC2T45GT,115
Nexperia USA Inc.
-
SN74LVC1T45YZPR
Texas Instruments
-
LSF0102DCUR
Texas Instruments
-
SN74LVC1T45DCKR
Texas Instruments
-
TXS0102DCTR
Texas Instruments
-
FXLP34P5X
onsemi
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
