My Inquiry
My Account
Texas Instruments SN74LXC2T45DCUR
- Part No.:
- SN74LXC2T45DCUR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LXC2T45DCUR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:49,040
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LXC2T45 from Texas Instruments is a dual-bit, dual-supply noninverting bidirectional bus transceiver with configurable level shifting. It supports independent 1.1 V–5.5 V operation on A and B ports, delivers up to 420 Mbps (3.3 V → 5.0 V), features Schmitt-trigger inputs for noise immunity, and includes VCC isolation and Ioff-float for partial power-down. It enables voltage translation in automotive ADAS fusion modules.
For engineers reviewing the SN74LXC2T45 datasheet, SN74LXC2T45 pinout, SN74LXC2T45 application, or SN74LXC2T45 equivalent, key selection criteria include dual-rail supply flexibility, guaranteed glitch-free power sequencing, ±4000-V HBM ESD rating, 1.1 V minimum logic compatibility, and support for industrial temperature range (–40°C to +125°C).
Technical Context
The SN74LXC2T45 implements fully independent dual-rail architecture: A-port pins (A1, A2, DIR) reference VCCA; B-port pins (B1, B2) reference VCCB. Direction control is unidirectional-DIR high enables A→B data flow; DIR low enables B→A flow. No internal direction arbitration or auto-sensing logic is present.
Its robust power sequencing relies on integrated dynamic pull-down resistors on all I/Os and static pull-downs on DIR, eliminating external biasing. The Ioff-float feature forces all I/Os into high-impedance when either VCCA or VCCB drops below 100 mV, preventing back-drive and bus contention during partial power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA/VCCB) | 1.1 V to 5.5 V per port - enables direct interface between sub-1.2 V logic and 5 V legacy systems without external level-shifting components. |
| Max Data Rate | 420 Mbps (3.3 V → 5.0 V) - supports high-speed serial control links such as camera sensor configuration buses in ADAS. |
| Input Threshold Hysteresis | 0.2 V to 1.06 V (ΔVT) - ensures reliable switching on slow-rising or noisy signals like mechanical switch debouncing outputs. |
| Ioff Current | ≤2.5 µA (–40°C to 125°C) - guarantees minimal leakage during system sleep states, critical for battery-backed infotainment head units. |
| ESD Rating | ±4000 V HBM - meets automotive electronics robustness requirements for in-vehicle assembly and field operation. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood and cockpit-mounted automotive ECUs without derating. |
| Output Drive Strength | Up to 32 mA at 5 V - sufficient to directly drive LEDs or small-signal MOSFET gates without buffer stages. |
Pinout & Package
SN74LXC2T45 is available in four production-grade 8-pin packages: SM8 (DCT), VSSOP (DCU), SON (DTT), and X2SON (DTM). All variants share identical pin mapping and electrical behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply rail | Reference for A1, A2, and DIR logic thresholds; must be stable within 1.1–5.5 V during operation. |
| VCCB | B-port supply rail | Reference for B1 and B2 logic thresholds; independently adjustable from VCCA for true bidirectional level translation. |
| GND | Common return path | Shared ground reference for both supply domains; required for proper Ioff-float activation and ESD current path. |
| DIR | Direction control input | Referenced to VCCA; high = A→B, low = B→A; static pull-down allows floating control without external resistor. |
| A1, A2 | A-port bidirectional I/Os | Configurable as input or output based on DIR state; Schmitt-trigger inputs tolerate slow edges and noise. |
| B1, B2 | B-port bidirectional I/Os | Functionally identical to A1/A2 but referenced to VCCB; dynamic pull-downs prevent floating states during tri-state. |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail design | Enables simultaneous 1.2 V microcontroller interfacing with 3.3 V sensor bus and 5 V display driver without external translators. |
| Glitch-free power supply sequencing | Eliminates need for strict VCCA/VCCB power-up order-safe for mixed-voltage SoC subsystems with staggered rail enable timing. |
| VCC isolation and Ioff-float | Prevents back-powering and bus contention when one domain powers down first-critical for hot-plug or modular ECU designs. |
| Schmitt-trigger inputs | Rejects noise on long PCB traces or cables (e.g., door switch lines), reducing false triggers without software debouncing overhead. |
| Integrated dynamic pull-down resistors | Reduces external component count by eliminating discrete 10–100 kΩ pull-downs on all I/Os-saves board space and BOM cost. |
Applications
| Infotainment Head Unit | ADAS Fusion Module |
|---|---|
Use Scenario: Interfacing a 1.1 V application processor GPIO bank with 3.3 V touchscreen controller and 5 V audio amplifier. IC Role / Device Role / Timing Role: Bidirectional voltage translator enabling protocol-agnostic data exchange between mismatched logic families. Use Value: Eliminates need for two separate unidirectional translators or complex discrete resistor networks-reduces layout complexity and signal integrity risk. | Use Scenario: Synchronizing camera, radar, and ultrasonic sensor data streams across heterogeneous voltage domains in real time. IC Role / Device Role / Timing Role: High-speed, low-skew bus transceiver supporting up to 420 Mbps for time-critical sensor configuration and status reporting. Use Value: Maintains <3.5 ns output skew across voltage translations, preserving timing margins in safety-critical sensor fusion pipelines. |
| Mechanical Switch Debouncing | LED/Buzzer Driver Interface |
Use Scenario: Conditioning noisy, slow-rising signals from vehicle door latch or ignition switch before MCU sampling. IC Role / Device Role / Timing Role: Input conditioner with Schmitt-trigger hysteresis and integrated pull-down, acting as hardware debouncer. Use Value: Reduces firmware interrupt load and eliminates need for RC filters or dedicated debounce ICs-improves system responsiveness and reliability. | Use Scenario: Driving indicator LEDs and audible buzzers from low-voltage MCU outputs while sourcing up to 32 mA at 5 V. IC Role / Device Role / Timing Role: Level-shifting driver with high-current capability, replacing discrete transistor+resistor stages. Use Value: Delivers full brightness and loudness without external active components-lowers BoM cost and simplifies thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0202DCUR | Auto-direction sensing (no DIR pin); lower max speed (100 Mbps); no Schmitt inputs; higher ICC in active state. | Best for simple push-pull bus interfaces where direction is inherently known (e.g., I²C), not for controlled bidirectional data paths. | Select SN74LXC2T45 when explicit DIR control, >100 Mbps throughput, or noise-immune inputs are required. |
| SN74AVC2T245DCUR | Fixed 1.2–3.6 V range; no VCC isolation; no Ioff-float; higher drive (64 mA); no Schmitt inputs. | Suitable for high-drive, narrow-voltage applications (e.g., FPGA-to-FPGA interconnect), not for wide-range or partial-power-down use cases. | Choose SN74LXC2T45 for systems requiring 1.1–5.5 V flexibility, hot-swap safety, or ultra-low standby current. |
Compared with TXS0202DCUR and SN74AVC2T245DCUR, the SN74LXC2T45 uniquely combines wide dual-supply range (1.1–5.5 V), guaranteed glitch-free sequencing, Schmitt-trigger noise immunity, and Ioff-float for safe partial power-down-making it optimal for automotive and industrial mixed-voltage subsystems demanding robustness and design margin.
Availability
SN74LXC2T45 is available at Aetrix Electronics and suitable for automotive ADAS fusion modules, infotainment head units, and industrial human-machine interface (HMI) systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for SN74LXC2T45 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 for industrial, automotive, and personal electronics markets.
The SN74LXC2T45 belongs to TI's LXC logic family, designed specifically for robust, low-power, wide-voltage-level translation in automotive and industrial environments where supply sequencing, ESD resilience, and extended temperature operation are mandatory.
FAQ
What is the minimum operating voltage for SN74LXC2T45 on either port?
The SN74LXC2T45 supports operation down to 1.1 V on both VCCA and VCCB supplies. This enables direct interfacing with modern ultra-low-voltage microcontrollers and sensors without intermediate regulation or translation stages. Operation below 1.1 V is not guaranteed and may result in undefined logic states or increased propagation delay.
Does SN74LXC2T45 require external pull-up or pull-down resistors on its I/O pins?
No, the SN74LXC2T45 integrates dynamic pull-down resistors on all I/O pins (A1, A2, B1, B2) and a static pull-down on the DIR input. These eliminate the need for external resistors in most configurations, reducing BOM count and PCB area. External resistors may still be used if stronger pull strength or specific threshold tuning is required.
How does the Ioff-float feature work in SN74LXC2T45?
When either VCCA or VCCB falls below 100 mV, the SN74LXC2T45 automatically pulls all I/Os low and then places them in high-impedance state. This prevents back-driving of powered domains and bus contention during partial power-down events-essential for modular automotive ECUs and hot-pluggable subsystems.
Can SN74LXC2T45 translate between 1.2 V and 5.0 V logic levels bidirectionally?
Yes, the SN74LXC2T45 supports bidirectional translation between 1.2 V and 5.0 V logic levels. With VCCA = 1.2 V and VCCB = 5.0 V, it achieves up to 40 Mbps in both directions (per Table 6.6). The device maintains valid logic thresholds and output drive across this full range without external components.
What is the maximum allowable voltage difference between VCCA and VCCB for SN74LXC2T45?
The SN74LXC2T45 has no specified maximum differential voltage between VCCA and VCCB. Both supplies are rated for 1.1 V to 5.5 V independently, and absolute maximum ratings allow each to reach 6.5 V. However, functional operation requires both supplies to remain within their recommended 1.1–5.5 V range simultaneously-differential operation up to 4.4 V (e.g., VCCA = 1.1 V, VCCB = 5.5 V) is fully supported.
SN74LXC2T45DCUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LXC
- 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:
- 1.1 V ~ 5.5 V
- Voltage - VCCB:
- 1.1 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Push-Pull
- Data Rate:
- 420Mbps
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFSOP (0.091", 2.30mm Width)
SN74LXC2T45DCUR FAQ
1.How can I place an order for SN74LXC2T45DCUR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LXC2T45DCUR 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 SN74LXC2T45DCUR reliable?
The price and inventory of SN74LXC2T45DCUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LXC2T45DCUR is usually 5 days.
3.What payment methods are accepted for SN74LXC2T45DCUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LXC2T45DCUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LXC2T45DCUR?
SN74LXC2T45DCUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LXC2T45DCUR 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 SN74LXC2T45DCUR?
For technical support, including SN74LXC2T45DCUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LXC2T45DCUR requirements.
6.How does Aetrix verify that SN74LXC2T45DCUR is sourced from the original manufacturer or authorized distributors?
All SN74LXC2T45DCUR 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 SN74LXC2T45DCUR meets industry standards.
7.What is the process for return or replacement of SN74LXC2T45DCUR?
All SN74LXC2T45DCUR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LXC2T45DCUR, 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 SN74LXC2T45DCUR part is unused and in its original packaging.
Return procedure for SN74LXC2T45DCUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LXC2T45DCUR 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…
