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Texas Instruments SN74LVC2T45DCTTG4
- Part No.:
- SN74LVC2T45DCTTG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC2T45DCTTG4.pdf
- Description:
- IC TRANSLATOR BIDIRECTIONAL SM8
- 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 VCC isolation. It is used in mixed-voltage I²C, UART, and GPIO interconnects between SoCs 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 independent), guaranteed high-speed operation up to 420 Mbps (3.3 V → 5 V), Ioff-enabled partial-power-down support, and NanoFree™ DCT 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-VCCA for A-side logic and DIR, VCCB for B-side logic-enabling true level-shifting without external biasing. The device maintains functional integrity across all valid VCCA/VCCB combinations within 1.65 V–5.5 V.
Its Ioff circuitry ensures <±2 µA leakage when either VCCA or VCCB is at 0 V, placing both ports in high-impedance state per JESD78 Class II latch-up compliance (>100 mA). ESD protection meets ±4000-V HBM, ±1000-V CDM, and ±200-V MM per JESD22.
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 domains without redesign. |
| Max Data Rate | 420 Mbps (3.3 V → 5 V) - supports high-speed serial links like fast-mode Plus I²C or low-latency GPIO expansion. |
| Output Drive | ±24 mA at 3.3 V - drives standard CMOS loads and short traces without external buffers. |
| ICC (max) | 4 µA - enables ultra-low static power in battery-backed or always-on subsystems. |
| Ioff Leakage | ±2 µA - prevents backflow current during partial power-down, critical for hot-swap and domain-isolation designs. |
| Propagation Delay | 0.5–17.7 ns (A↔B, VCCA/VCCB = 1.8–5 V) - ensures timing predictability across voltage combinations. |
| ESD Rating | ±4000 V HBM - meets industrial-grade handling requirements without additional protection circuitry. |
Pinout & Package
SN74LVC2T45DCTTG4 uses the 8-pin SM8 (DCT) package: 2.95 mm × 4.00 mm, 0.65 mm pitch, lead-free, RoHS-compliant NanoFree™封装 with no die pad. Pin 1 = VCCA, Pin 4 = GND, Pin 5 = DIR, Pin 8 = VCCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply and DIR reference | Defines logic thresholds for A1, A2, and DIR; must be stable before DIR assertion. |
| A1 / A2 (Pins 2, 3) | Bidirectional A-side data I/O | Referenced to VCCA; tolerate 0–VCCA input, drive 0–VCCA output; require external pull-ups if open-drain emulation needed. |
| GND (Pin 4) | Common reference plane | Single ground connection required; no separate analog/digital GND pins. |
| DIR (Pin 5) | Direction control input | High = A→B transmission; Low = B→A transmission; referenced strictly to VCCA, not VCCB. |
| B2 / B1 (Pins 6, 7) | Bidirectional B-side data I/O | Referenced to VCCB; tolerate 0–VCCB input, drive 0–VCCB output; independent of VCCA voltage. |
| VCCB (Pin 8) | B-port supply | Defines logic thresholds for B1, B2; enables independent power sequencing with VCCA. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail supply independence | VCCA and VCCB operate from 1.65 V to 5.5 V concurrently - eliminates need for level-shifter ICs or resistor networks in multi-voltage systems. |
| VCC isolation | Both ports enter high-Z when either VCCA or VCCB = 0 V - prevents backfeed during power sequencing or fault conditions. |
| Ioff partial-power-down | Enables safe power gating of one domain while keeping other active - essential for low-power MCU sleep modes with retained peripheral interfaces. |
| Glitch-free power sequencing | No spurious outputs during VCCA/VCCB ramp-up/down in any order - avoids false edge detection on connected logic or microcontrollers. |
| NanoFree™ DCT package | 0.65 mm pitch, no leadframe - reduces PCB area by >30% vs. SOIC-8 and enables routing under fine-pitch BGAs. |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
|
Use Scenario: Interfacing 3.3-V microcontroller GPIOs to legacy 5-V sensor inputs and actuators in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level translator enabling real-time status reporting and command execution across voltage domains without added delay or signal inversion. Use Value: Eliminates discrete resistor-divider networks and associated calibration drift; supports 420-Mbps burst reads from high-speed analog front-ends. |
Use Scenario: Connecting 1.8-V infotainment SoC I²C lines to 3.3-V CAN transceivers and door-lock actuators in body electronics. IC Role / Device Role / Timing Role: Voltage-translating I²C bus extender with Ioff support for safe hot-plug of modules during vehicle service. Use Value: Maintains I²C timing compliance (tBUF, tHD:STA) across 1.8 V/3.3 V transitions; withstands automotive load-dump transients via integrated ESD protection. |
| Enterprise SSD NVMe Interface | Medical Wearable Sensor Hub |
|
Use Scenario: Bridging 1.2-V NVMe controller signals to 1.8-V flash memory interface in ultra-thin SSD modules. IC Role / Device Role / Timing Role: Dual-bit translator managing address/data strobes with sub-2-ns propagation skew between A1/A2 paths. Use Value: Enables direct integration without retiming logic; 4-µA ICC extends standby battery life in portable storage devices. |
Use Scenario: Isolating 3.3-V wearable MCU from 2.5-V biopotential ADCs and 1.8-V Bluetooth LE radios in continuous-monitoring patches. IC Role / Device Role / Timing Role: Low-leakage bidirectional translator supporting partial-power-down during sensor acquisition cycles. Use Value: Ioff <±2 µA prevents cross-domain current leakage that would degrade ADC SNR or BLE RF sensitivity. |
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); higher ICC (10 µA typical) | Best for push-pull I²C/SPI where direction is data-driven; unsuitable for DIR-controlled GPIO or UART handshaking | Select SN74LVC2T45DCTTG4 when explicit DIR control, higher drive, or lower quiescent current is required. |
| SN74AVC2T244RSWR | Two independent 2-bit buffers (non-bidirectional); no VCC isolation; 1.2–3.6 V only | Used in unidirectional address/data latching; lacks bidirectional capability and wide-voltage translation | Choose SN74LVC2T45DCTTG4 for true bidirectional, rail-to-rail translation with power-domain isolation. |
Compared with TXS0102DCUR and SN74AVC2T244RSWR, SN74LVC2T45DCTTG4 uniquely delivers manual DIR control, 1.65–5.5 V dual-rail flexibility, VCC isolation, and 4-µA ICC - making it optimal for deterministic, low-power, mixed-voltage system interconnects.
Availability
SN74LVC2T45DCTTG4 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, enterprise storage, and medical wearable applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74LVC2T45DCTTG4 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, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
SN74LVC2T45 belongs to TI's LVC logic family, engineered for robust voltage translation in space- and power-constrained mixed-signal systems - emphasizing rail independence, low ICC, and seamless integration with modern low-voltage MCUs and sensors.
FAQ
What is the function of the DIR pin on the SN74LVC2T45DCTTG4?
The DIR (direction) pin on the SN74LVC2T45DCTTG4 controls data flow direction and is referenced exclusively to VCCA. When DIR is high, data passes from the A port (A1/A2) to the B port (B1/B2); when DIR is low, data flows from B to A. This single-pin control enables deterministic bidirectional communication without handshake protocols or additional logic.
Can SN74LVC2T45DCTTG4 translate between 1.8 V and 5 V rails?
Yes, SN74LVC2T45DCTTG4 supports translation between 1.8 V and 5 V rails: set VCCA = 1.8 V and VCCB = 5 V for B→A translation, or VCCA = 5 V and VCCB = 1.8 V for A→B translation. Its specified 1.65–5.5 V range per rail and 420-Mbps max rate (3.3 V → 5 V) confirm full interoperability across these nodes.
Does SN74LVC2T45DCTTG4 support partial power-down operation?
Yes, SN74LVC2T45DCTTG4 supports partial power-down via its Ioff feature. When either VCCA or VCCB is at 0 V, the Ioff circuit disables all I/Os, limiting leakage to ±2 µA and forcing both ports into high-impedance state - preventing back-current and ensuring safe operation during domain-specific power gating.
What is the thermal resistance (RθJA) of SN74LVC2T45DCTTG4 in the DCT package?
The junction-to-ambient thermal resistance (RθJA) of SN74LVC2T45DCTTG4 in the 8-pin DCT (SM8) package is 195.3 °C/W. This value assumes standard JEDEC 2-layer board conditions and informs thermal design margins when operating at maximum ICC and output loading across –40°C to +85°C ambient.
Is SN74LVC2T45DCTTG4 compatible with I²C bus operation?
SN74LVC2T45DCTTG4 can interface with I²C buses when configured for unidirectional use (e.g., fixed DIR) and paired with appropriate pull-up resistors on each side. However, it lacks built-in bus arbitration or open-drain emulation - for native bidirectional I²C translation, TI recommends dedicated devices like TCA9617A.
SN74LVC2T45DCTTG4 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-LSSOP, 8-MSOP (0.110", 2.80mm Width)
SN74LVC2T45DCTTG4 FAQ
1.How can I place an order for SN74LVC2T45DCTTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC2T45DCTTG4 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 SN74LVC2T45DCTTG4 reliable?
The price and inventory of SN74LVC2T45DCTTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC2T45DCTTG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC2T45DCTTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC2T45DCTTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC2T45DCTTG4?
SN74LVC2T45DCTTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC2T45DCTTG4 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 SN74LVC2T45DCTTG4?
For technical support, including SN74LVC2T45DCTTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC2T45DCTTG4 requirements.
6.How does Aetrix verify that SN74LVC2T45DCTTG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC2T45DCTTG4 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 SN74LVC2T45DCTTG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC2T45DCTTG4?
All SN74LVC2T45DCTTG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC2T45DCTTG4, 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 SN74LVC2T45DCTTG4 part is unused and in its original packaging.
Return procedure for SN74LVC2T45DCTTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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