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Texas Instruments SN74LVC2T45DCUR
- Part No.:
- SN74LVC2T45DCUR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC2T45DCUR.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 output drive at 3.3 V, 4-μA maximum ICC, and Ioff support for partial-power-down operation. It is used in mixed-voltage interconnects between microcontrollers and peripherals in portable electronics.
For engineers reviewing the SN74LVC2T45 datasheet, SN74LVC2T45 pinout, SN74LVC2T45 application, or SN74LVC2T45 equivalent, key selection considerations include dual-rail supply flexibility (VCCA/VCCB independent), guaranteed high-impedance state during VCC isolation, maximum data rates up to 420 Mbps (3.3 V → 5 V), latch-up immunity (>100 mA), and ESD robustness (±4000-V HBM).
Technical Context
The SN74LVC2T45 implements asynchronous bidirectional translation using two independent CMOS I/O ports: A-port referenced to VCCA (1.65–5.5 V), B-port referenced to VCCB (1.65–5.5 V). DIR input is strictly referenced to VCCA, determining signal flow direction-high enables A→B, low enables B→A. Input circuits remain active regardless of DIR state, requiring defined logic levels on all data pins to avoid excess ICC/ICCZ.
VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB = GND. Ioff circuitry disables outputs during partial power-down, limiting leakage to ±2 μA per pin. Propagation delays range from 0.5 ns (5 V → 5 V) to 17.7 ns (1.8 V → 1.8 V), with enable/disable times under 30 ns across all supported voltage combinations.
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 level-shifter ICs |
| Max Data Rate | 420 Mbps (3.3 V → 5 V) - supports high-speed interface bridging such as USB PHY signaling or FPGA-to-ASIC links |
| Output Drive | ±24 mA at 3.3 V - sufficient to drive 50-Ω transmission lines or multiple CMOS loads without external buffers |
| Ioff Leakage | ±2 μA max - ensures safe partial-power-down operation in battery-backed systems with unpowered rails |
| ESD Rating | ±4000 V HBM - meets industrial-grade robustness requirements for handheld and field-deployable equipment |
| Propagation Delay | 0.5–17.7 ns (VCCA/VCCB dependent) - deterministic timing for synchronous clock domain crossing in real-time systems |
| Latch-up Immunity | >100 mA per JESD78 Class II - prevents destructive latch-up during transient overvoltage events |
Pinout & Package
SN74LVC2T45 is packaged in an 8-pin DCT (SM8) package measuring 2.95 mm × 4 mm, with exposed pad thermal enhancement. Pin functions are validated per TI SCES516N Rev. JUNE 2024.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply rail | Powers A1/A2 I/Os and DIR input; sets VIH/VIL thresholds for DIR and A-side signals |
| A1 (Pin 2) | A-port data I/O | Bidirectional signal path referenced to VCCA; must be driven to valid logic level at all times |
| A2 (Pin 3) | A-port data I/O | Independent second channel; shares VCCA bias and DIR control with A1 |
| GND (Pin 4) | Ground reference | Common return for both supply rails; required for stable noise margin and ESD current path |
| DIR (Pin 5) | Direction control input | Logic-high enables A→B transmission; logic-low enables B→A; referenced solely to VCCA |
| B2 (Pin 6) | B-port data I/O | Bidirectional signal path referenced to VCCB; operates independently of A-port voltage |
| B1 (Pin 7) | B-port data I/O | Second B-side channel; supports full-duplex or time-multiplexed bidirectional use |
| VCCB (Pin 8) | B-port supply rail | Powers B1/B2 I/Os; defines output swing and input thresholds on B side |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail operation | VCCA and VCCB independently set between 1.65 V and 5.5 V - eliminates need for discrete level-shifting components in multi-voltage SoC interfaces |
| VCC isolation | Both ports go high-Z if either VCCA or VCCB = GND - prevents backfeed and ensures safe hot-swap or rail sequencing in modular systems |
| Ioff partial-power-down support | Outputs disabled with leakage ≤ ±2 μA when powered down - enables zero-power standby in battery-critical applications like wearables |
| Glitch-free power sequencing | No spurious output transitions during asymmetric VCCA/VCCB ramp-up/down - avoids false interrupts or configuration errors in FPGA/CPU boot sequences |
| High-speed translation capability | 420 Mbps max (3.3 V → 5 V) with sub-10 ns propagation delay at 3.3 V/3.3 V - suitable for DDR memory sideband signaling and PCIe auxiliary lanes |
Applications
| Industrial Sensor Interface | USB-C Power Delivery Controller Link |
|---|---|
|
Use Scenario: Interfacing a 3.3-V microcontroller with legacy 5-V analog sensor modules in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional voltage translator enabling command/response exchange over shared I²C or SPI bus while maintaining rail independence. Use Value: Eliminates need for separate level-shifter ICs or resistor-divider networks, reducing BOM count and PCB area by >30% in space-constrained DIN-rail modules. |
Use Scenario: Connecting a 1.8-V USB PD controller to a 3.3-V system management MCU in laptop power subsystems. IC Role / Device Role / Timing Role: Asynchronous bidirectional translator for CC line communication and vendor-defined messages (VDMs) with strict timing compliance. Use Value: Supports 420-Mbps burst signaling during PD negotiation while meeting USB-IF timing jitter limits (<1 ns) due to sub-7-ns tPLH/tPHL at 3.3 V/1.8 V. |
| Wearable Health Monitor Data Hub | Automotive Body Control Module (BCM) Gateway |
|
Use Scenario: Aggregating data from multiple low-power sensors (1.8-V accelerometers, 2.5-V bio-impedance ADCs) into a 3.3-V ARM Cortex-M4 host. IC Role / Device Role / Timing Role: Dual-channel translator managing simultaneous I²C and UART traffic with independent VCCA/VCCB rails for optimal power gating. Use Value: Ioff leakage <2 μA allows complete shutdown of sensor rails during sleep mode, extending battery life beyond 7 days on coin-cell power. |
Use Scenario: Bridging LIN transceiver (5-V logic) and CAN FD controller (3.3-V I/O) in vehicle body domain ECUs. IC Role / Device Role / Timing Role: Robust bidirectional translator handling diagnostic commands and firmware updates across mixed-voltage subnets. Use Value: ±4000-V HBM ESD rating and >100-mA latch-up immunity ensure reliable operation in harsh automotive environments with load-dump transients. |
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 at 3.3 V); higher ICC (10 μA typical) | Best for push-pull buses where direction is inferred from data activity; unsuitable for explicit DIR-controlled protocols like SPI | Select SN74LVC2T45 when deterministic direction control, higher drive, or lower static power is required. |
| SN74AVC2T245DCUR | Higher speed (500 Mbps), tighter timing (tPLH/tPHL ≤ 3.5 ns at 3.3 V), but narrower VCC range (1.2–3.6 V per rail) | Optimized for 1.8-V/2.5-V/3.3-V only; cannot translate to or from 5-V logic | Choose SN74LVC2T45 for 5-V interoperability or wider voltage flexibility; choose SN74AVC2T245DCUR for ultra-low-latency 3.3-V-only links. |
Compared with TXS0102DCUR and SN74AVC2T245DCUR, the SN74LVC2T45 uniquely balances wide voltage coverage (1.65–5.5 V), explicit DIR control, and industrial-grade robustness - making it the preferred choice for mixed-voltage industrial gateways and automotive body electronics where rail compatibility and reliability are non-negotiable.
Availability
SN74LVC2T45 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C power delivery subsystems, wearable health monitors, and automotive body control modules requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long production lifecycles.
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 specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-reliability interface solutions.
The SN74LVC2T45 belongs to TI's LVC logic family, designed specifically for low-voltage, mixed-rail system interfacing in space-constrained, power-sensitive applications such as portable instrumentation and automotive submodules.
FAQ
What voltage ranges can SN74LVC2T45 translate between?
The SN74LVC2T45 supports independent supply rails: VCCA and VCCB each operate from 1.65 V to 5.5 V. This enables translation between any combination of standard logic voltages - including 1.8 V ↔ 2.5 V, 1.8 V ↔ 3.3 V, 3.3 V ↔ 5 V, and 2.5 V ↔ 5 V - without external components. The device maintains valid logic thresholds and output drive across the full range, as verified in TI SCES516N Section 5.3.
How does the DIR pin function in SN74LVC2T45?
In the SN74LVC2T45, the DIR pin is referenced exclusively to VCCA and controls data direction: a logic HIGH enables transmission from A-port to B-port; a logic LOW enables transmission from B-port to A-port. DIR must be held at a valid VCCA-referenced level at all times - floating or slow-transitioning DIR signals cause undefined behavior and increased ICC. This explicit control differs from auto-sensing translators and ensures deterministic timing in synchronous protocols.
Does SN74LVC2T45 support partial power-down operation?
Yes, the SN74LVC2T45 includes Ioff circuitry that disables outputs and limits leakage current to ±2 μA per pin when either VCCA or VCCB is at 0 V. This feature enables safe partial-power-down operation in battery-powered systems, such as wearables or IoT edge nodes, where one voltage rail may be shut down while the other remains active. Ioff performance is specified in Section 5.5 of the SN74LVC2T45 datasheet.
What is the maximum data rate achievable with SN74LVC2T45?
The SN74LVC2T45 achieves up to 420 Mbps when translating from 3.3 V to 5 V (Section 1, Features), with verified switching characteristics down to 0.5 ns propagation delay in 5 V → 5 V configurations. Real-world throughput depends on load capacitance, termination, and voltage pair - e.g., 210 Mbps for 3.3 V → 3.3 V, 140 Mbps for 3.3 V → 2.5 V, and 75 Mbps for 3.3 V → 1.8 V - all documented in Sections 5.6–5.9 of the datasheet.
Is SN74LVC2T45 compatible with 5-V tolerant inputs?
Yes, the SN74LVC2T45 accepts input voltages up to 5.5 V on both A and B ports regardless of VCCA or VCCB setting, as confirmed by Absolute Maximum Ratings (Section 5.1). When VCCA = 1.8 V, the A-port inputs tolerate 5-V signals without damage or level-shifting circuitry - a key enabler for interfacing legacy 5-V peripherals with modern low-voltage controllers. This tolerance is intrinsic to the device's design and requires no external protection.
SN74LVC2T45DCUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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)
SN74LVC2T45DCUR FAQ
1.How can I place an order for SN74LVC2T45DCUR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC2T45DCUR 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 SN74LVC2T45DCUR reliable?
The price and inventory of SN74LVC2T45DCUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC2T45DCUR is usually 5 days.
3.What payment methods are accepted for SN74LVC2T45DCUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC2T45DCUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC2T45DCUR?
SN74LVC2T45DCUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC2T45DCUR 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 SN74LVC2T45DCUR?
For technical support, including SN74LVC2T45DCUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC2T45DCUR requirements.
6.How does Aetrix verify that SN74LVC2T45DCUR is sourced from the original manufacturer or authorized distributors?
All SN74LVC2T45DCUR 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 SN74LVC2T45DCUR meets industry standards.
7.What is the process for return or replacement of SN74LVC2T45DCUR?
All SN74LVC2T45DCUR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC2T45DCUR, 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 SN74LVC2T45DCUR part is unused and in its original packaging.
Return procedure for SN74LVC2T45DCUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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