My Inquiry
My Account
Texas Instruments SN74LVC2T45DCURE4
- Part No.:
- SN74LVC2T45DCURE4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC2T45DCURE4.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,428
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 features independent A- and B-port supplies (VCCA/VCCB), DIR-controlled data direction, ±24-mA drive at 3.3 V, and 4-μA maximum ICC. It is used in mixed-voltage I²C, UART, and GPIO interconnects between microcontrollers and peripherals.
For engineers reviewing the SN74LVC2T45 datasheet, SN74LVC2T45 pinout, SN74LVC2T45 application, or SN74LVC2T45 equivalent, key selection considerations include configurable dual-rail operation, VCC isolation behavior, Ioff-enabled partial-power-down support, high-speed translation 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 via a DIR-input-controlled signal path: high DIR enables A→B transmission, low DIR enables B→A. Each port's I/O circuitry is referenced to its respective supply rail (A to VCCA, B to VCCB), supporting independent 1.65–5.5 V operation without sequencing constraints.
VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB = GND; Ioff limits leakage to ±2 μA during power-down. The device delivers balanced CMOS push-pull outputs with propagation delays as low as 0.5 ns (tPHL, VCCA = 5 V, VCCB = 5 V) and supports glitch-free power-up/down across all rail combinations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65 V to 5.5 V - Enables translation among 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without level-shifters. |
| Max Data Rate | 420 Mbps (3.3 V → 5 V) - Supports high-speed serial interfaces like fast-mode-plus I²C or low-latency GPIO bridging. |
| Output Drive | ±24 mA at 3.3 V - Sustains robust signal integrity into moderate capacitive loads (e.g., 15 pF) without external buffers. |
| Ioff Leakage | ±2 μA max - Prevents backflow current during partial power-down, critical for battery-backed or hot-swap systems. |
| VCC Isolation | Both ports go Hi-Z if VCCA = GND or VCCB = GND - Eliminates risk of contention or latch-up during rail sequencing faults. |
| ESD Rating | ±4000 V HBM - Meets industrial-grade ESD immunity requirements without additional protection circuitry. |
| ICC Max | 4 μA - Enables ultra-low static power in always-on monitoring or wake-on-event subsystems. |
Pinout & Package
SN74LVC2T45 is available in DCT (SM8, 8-pin), DCU (VSSOP, 8-pin), and YZP (DSBGA, 8-pin) packages. All variants share identical pin functionality and electrical behavior. The DCT and DCU packages use top-view pin numbering; YZP uses bottom-view mapping with ball-grid alignment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply reference | 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 referenced to VCCA; must be driven to valid logic levels to avoid excess ICCZ. |
| A2 (Pin 3) | A-port data I/O | Second bidirectional channel on A side; electrically isolated from B-side except through transceiver logic. |
| 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 | Referenced to VCCA; high = A→B, low = B→A; no internal pull-up/down - must be actively driven. |
| B2 (Pin 6) | B-port data I/O | Bidirectional signal referenced to VCCB; threshold and drive strength scale with VCCB voltage. |
| B1 (Pin 7) | B-port data I/O | Second bidirectional channel on B side; supports independent voltage domain from A side. |
| VCCB (Pin 8) | B-port supply reference | Powers B1/B2 I/Os; decoupling capacitor placement near this pin is critical for switching noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail operation | Independent 1.65–5.5 V supplies on VCCA and VCCB enable arbitrary voltage node translation (e.g., 1.8 V ↔ 3.3 V, 2.5 V ↔ 5 V) without external biasing. |
| VCC isolation | Automatic high-impedance state on both ports if either VCCA or VCCB is grounded - prevents bus contention during power sequencing failures. |
| Ioff partial-power-down support | Leakage limited to ±2 μA per I/O when powered down - allows safe integration into systems with asymmetric rail activation (e.g., standby + active subsystems). |
| High-speed translation | 420 Mbps max rate (3.3 V → 5 V) with sub-10 ns propagation delay - suitable for time-critical digital bridges in industrial PLCs and telecom baseband modules. |
| NanoFree™ packaging | DCT/DCU/YZP options provide footprint scalability from 2.0 × 3.1 mm (DCU) to 1.5 × 0.5 mm (YZP) - ideal for wearables, IoT sensors, and dense MCU peripheral expansion. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Interfacing 1.8-V MEMS accelerometers with a 3.3-V microcontroller in factory automation equipment. IC Role / Device Role / Timing Role: Bidirectional voltage translator enabling real-time sensor data readback and configuration writes across mismatched I/O voltages. Use Value: Eliminates need for discrete level-shifter ICs or resistor-divider networks, reducing BOM count and layout area while maintaining 420-Mbps timing headroom. |
Use Scenario: Connecting 5-V legacy CAN transceivers to a 3.3-V automotive MCU GPIO bank for diagnostic signaling. IC Role / Device Role / Timing Role: Asynchronous bus transceiver translating control/status bits between voltage domains with guaranteed glitch-free power sequencing. Use Value: VCC isolation prevents bus lockup during ignition-cycle rail ramp-up; Ioff ensures zero current injection into powered-down CAN subsystems. |
| IoT Edge Node Communication | Enterprise SSD Controller Interface |
Use Scenario: Bridging 2.5-V eMMC command lines to a 1.8-V application processor in battery-powered edge gateways. IC Role / Device Role / Timing Role: Dual-bit translator handling CMD/DAT lines with direction controlled by processor GPIO, supporting HS200 mode timing. Use Value: Sub-10 ns propagation delay and ±24-mA drive ensure signal integrity at 200 MHz clock rates; NanoFree™ YZP package fits within tight 0.5-mm pitch constraints. |
Use Scenario: Level-shifting between a 3.3-V NVMe controller and 1.8-V NAND flash memory in enterprise solid-state drives. IC Role / Device Role / Timing Role: Dual-channel translator managing address/data strobes with precise DIR timing to avoid setup/hold violations. Use Value: 4-μA ICC enables low-quiescent-power idle states; balanced push-pull outputs reduce jitter-induced bit errors in high-density NAND arrays. |
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 |
|---|---|---|---|
| TXB0102RGTR | Auto-direction sensing (no DIR pin); lower drive (±8 mA at 3.3 V); 1.2–3.6 V VCCA/VCCB range. | Suitable for open-drain buses (I²C) but not push-pull protocols requiring explicit DIR control (e.g., SPI, GPIO). | Select SN74LVC2T45 when deterministic direction control, higher drive, or wider voltage range (up to 5.5 V) is required. |
| SN74AVC2T245RSWR | Higher speed (500 Mbps), lower ICC (2 μA), same pinout; requires VCCA ≥ VCCB for translation direction. | Optimized for 3.3 V ↔ 1.8 V mobile interfaces; lacks VCC isolation and Ioff specs for industrial power-down use cases. | Choose SN74LVC2T45 for systems needing rail-agnostic sequencing, partial-power-down safety, or 5-V compatibility. |
Compared with TXB0102RGTR and SN74AVC2T245RSWR, the SN74LVC2T45 uniquely combines explicit DIR control, full 1.65–5.5 V dual-rail flexibility, VCC isolation, and industrial-grade Ioff - making it the preferred choice for ruggedized, mixed-voltage embedded systems where reliability under fault conditions is critical.
Availability
SN74LVC2T45 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, IoT edge node communication, and enterprise SSD controller interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.
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 specializing in analog and embedded processing solutions, with leadership in interface, power management, and signal chain technologies.
The SN74LVC2T45 belongs to TI's LVC logic family, designed specifically for robust, low-power voltage translation in mixed-supply systems - targeting industrial automation, automotive electronics, and high-reliability consumer devices.
FAQ
What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of the SN74LVC2T45?
The SN74LVC2T45 supports any combination of VCCA and VCCB within 1.65 V to 5.5 V independently - including VCCA = 1.8 V and VCCB = 5 V, or vice versa. No maximum differential voltage is specified; the device is characterized for all valid pairings across its full operating range. This makes SN74LVC2T45 suitable for extreme voltage translation scenarios such as 1.8-V FPGA I/O interfacing with 5-V legacy peripherals.
Does the SN74LVC2T45 require external pull-up resistors on the A or B ports?
No, the SN74LVC2T45 does not require external pull-up resistors on A1, A2, B1, or B2 - its CMOS inputs have negligible DC loading and are fully compatible with driven logic sources. However, unused inputs must be actively tied to VCCI or GND to prevent floating states that increase ICCZ; pull-ups are unnecessary and may degrade noise margins or increase power in high-impedance modes.
How does the DIR input behave when VCCA is unpowered but VCCB is active?
When VCCA = GND (unpowered) and VCCB is active, the SN74LVC2T45 activates VCC isolation: both A and B ports enter high-impedance regardless of DIR state. The DIR input itself becomes invalid since it is referenced to VCCA - no logic interpretation occurs. This behavior is intrinsic to SN74LVC2T45 and eliminates bus contention risks during asymmetric power sequencing.
Can the SN74LVC2T45 translate between 1.2-V and 3.3-V logic domains?
No - the SN74LVC2T45 specifies a minimum supply voltage of 1.65 V for both VCCA and VCCB. Operation below 1.65 V is outside its guaranteed specifications and may result in undefined output states, excessive ICC, or failure to meet timing parameters. For 1.2-V interfaces, TI recommends the TXS0102 or similar auto-sensing translators rated down to 1.1 V.
What thermal derating applies to the SN74LVC2T45 in a 2-layer PCB with 1-oz copper?
In a standard 2-layer PCB with 1-oz copper, the SN74LVC2T45 in DCU package has RθJA = 195.3°C/W. At maximum ambient temperature (85°C) and 4-μA ICC, junction temperature rise is negligible (<1°C). Derating only becomes relevant under sustained high-current switching - e.g., driving 24-mA loads continuously at 85°C ambient requires verifying TJ < 150°C using RθJA and actual power dissipation calculated from Cpd and frequency.
SN74LVC2T45DCURE4 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)
SN74LVC2T45DCURE4 FAQ
1.How can I place an order for SN74LVC2T45DCURE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC2T45DCURE4 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 SN74LVC2T45DCURE4 reliable?
The price and inventory of SN74LVC2T45DCURE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC2T45DCURE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC2T45DCURE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC2T45DCURE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC2T45DCURE4?
SN74LVC2T45DCURE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC2T45DCURE4 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 SN74LVC2T45DCURE4?
For technical support, including SN74LVC2T45DCURE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC2T45DCURE4 requirements.
6.How does Aetrix verify that SN74LVC2T45DCURE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC2T45DCURE4 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 SN74LVC2T45DCURE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC2T45DCURE4?
All SN74LVC2T45DCURE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC2T45DCURE4, 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 SN74LVC2T45DCURE4 part is unused and in its original packaging.
Return procedure for SN74LVC2T45DCURE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVC2T45DCURE4 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…
