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Texas Instruments SN74LXC1T45QDCKRQ1
- Part No.:
- SN74LXC1T45QDCKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LXC1T45QDCKRQ1.pdf
- Description:
- AUTOMOTIVE, SINGLE-BIT DUAL-SUPP
- Quantity:
- Payment:
- Shipping:
Inventory:2,419
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Product details
Overview
SN74LXC1T45QDCKRQ1 from Texas Instruments is an automotive-grade, single-bit, dual-supply bidirectional bus transceiver enabling voltage level translation between 1.1 V and 5.5 V domains. It features Schmitt-trigger inputs for noise immunity, integrated dynamic pull-down resistors on I/Os, static pull-downs on DIR control, and supports up to 420 Mbps in 3.3 V → 5.0 V translation. It is used in automotive body control modules for interfacing low-voltage MCUs with higher-voltage sensors or actuators.
For engineers reviewing the SN74LXC1T45QDCKRQ1 datasheet, SN74LXC1T45QDCKRQ1 pinout, SN74LXC1T45QDCKRQ1 application, or SN74LXC1T45QDCKRQ1 equivalent, key selection considerations include VCCA/VCCB supply independence, Ioff-float isolation behavior, propagation delay vs. voltage/temperature, Schmitt-trigger hysteresis (ΔVT ≥ 0.2 V), and AEC-Q100 Grade 1 qualification for –40°C to +125°C operation.
Technical Context
The SN74LXC1T45QDCKRQ1 implements a noninverting bidirectional translation architecture where DIR referenced to VCCA controls data flow direction: high enables A→B, low enables B→A. Both A and B ports accept 1.1 V–5.5 V I/O voltages independently, with input thresholds (VT+, VT−) and hysteresis (ΔVT) defined per supply rail.
Its robust power sequencing tolerates arbitrary VCCA/VCCB ramp order. The VCC isolation feature activates when either supply drops below 100 mV, forcing I/Os into weak pull-down then high-impedance state-enabling safe partial-power-down without external circuitry. Ioff current remains ≤2.5 µA over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.1 V to 5.5 V each - enables direct interface between 1.2-V logic and 5-V peripherals without external level-shifting components. |
| Max Data Rate | 420 Mbps (3.3 V → 5.0 V) - supports high-speed CAN FD auxiliary signaling or fast sensor data handoff in ADAS subsystems. |
| Propagation Delay | 1 ns (min) to 15 ns (max) at 3.3 V - ensures timing-critical bidirectional communication meets setup/hold margins in real-time control loops. |
| Input Hysteresis (ΔVT) | ≥0.2 V across all VCC - rejects slow-rising or noisy switch inputs in cabin control panels or door latch monitoring. |
| Ioff Current | ≤2.5 µA (–40°C to +125°C) - guarantees negligible leakage during MCU sleep modes, preserving battery life in always-on vehicle networks. |
| ESD Rating | ±4000 V HBM, ±1000 V CDM - meets AEC-Q100 stress requirements for under-hood and infotainment ECU deployment. |
| Operating Temp | –40°C to +125°C - qualified for engine bay, transmission control, and front-end ADAS applications per AEC-Q100 Grade 1. |
Pinout & Package
SN74LXC1T45QDCKRQ1 is packaged in a 6-pin SC70 (DCK) package with nominal body size 2.00 mm × 1.25 mm, optimized for space-constrained automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply reference | Supplies power and defines logic threshold for DIR and A I/O; must be stable before enabling direction control. |
| GND | Ground reference | Common return path for both supply domains; requires low-inductance connection to minimize ground bounce in bidirectional switching. |
| A | Bidirectional I/O (VCCA-referenced) | Connects to low-voltage domain (e.g., 1.8-V MCU GPIO); includes integrated dynamic pull-down for floating-input immunity. |
| B | Bidirectional I/O (VCCB-referenced) | Connects to higher-voltage domain (e.g., 3.3-V or 5-V sensor bus); operates independently of VCCA voltage level. |
| DIR | Direction-control input | Referenced to VCCA; high = A→B, low = B→A; includes static pull-down to prevent floating-state metastability. |
| VCCB | B-port supply reference | Defines logic thresholds for B I/O; independent of VCCA, enabling true dual-rail operation without shared supply constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable dual-rail operation | Independent VCCA and VCCB supplies (1.1–5.5 V) allow seamless interconnection of mixed-voltage SoCs, sensors, and legacy peripherals without external translators. |
| VCC isolation (Ioff-float) | When either VCCA or VCCB <100 mV, I/Os enter weak pull-down then high-Z state-preventing back-driving and enabling hot-swap capability in modular ECUs. |
| Schmitt-trigger inputs | Input hysteresis ≥0.2 V eliminates false triggering from mechanical switch bounce or EMI-coupled noise in cabin or chassis interfaces. |
| Integrated pull-down resistors | Dynamic pull-downs on A/B I/Os and static pull-down on DIR eliminate need for external biasing components-reducing BOM count and board area in cost-sensitive modules. |
| Automotive qualification | AEC-Q100 Grade 1 certified with latch-up >100 mA and full-temp-range Ioff ≤2.5 µA-validated for safety-critical body electronics and powertrain sub-systems. |
Applications
| Body Control Module Interface | ADAS Sensor Hub Translation |
|---|---|
Use Scenario: Interfacing a 1.8-V microcontroller with 5-V HVAC actuators and door lock solenoids in a centralized body control unit. IC Role / Device Role: Bidirectional voltage translator enabling command transmission (MCU → actuator) and status feedback (actuator → MCU) across incompatible supply domains. Use Value: Eliminates discrete resistor-divider or MOSFET-based level shifters, reducing component count by 4–6 parts per channel while maintaining AEC-Q100 compliance. | Use Scenario: Connecting a 3.3-V radar processor to 1.2-V time-of-flight (ToF) proximity sensors in a front bumper ADAS cluster. IC Role / Device Role: High-speed bidirectional translator supporting 210 Mbps down-translation (3.3 V → 1.2 V) for synchronized sensor calibration data exchange. Use Value: Enables precise timing alignment between radar timing controller and low-voltage ToF sensor clocks without adding jitter or propagation skew. |
| Infotainment Display Backlight Control | Electric Power Steering (EPS) Feedback Loop |
Use Scenario: Driving 5-V LED backlight strings from a 1.2-V display controller in a digital instrument cluster. IC Role / Device Role: Unidirectional level shifter (configured via fixed DIR) translating PWM dimming signals while providing noise-immune Schmitt-trigger input. Use Value: Prevents flicker caused by slow-rising PWM edges from low-Vt controller outputs-ensuring smooth brightness transitions across operating temperature. | Use Scenario: Isolating torque sensor analog feedback lines (routed through 3.3-V signal conditioner) from a 5-V EPS motor driver MCU during sleep mode. IC Role / Device Role: Ioff-float enabled translator that enters high-Z state when VCCB is powered down-blocking leakage paths that could corrupt sensor offset calibration. Use Value: Maintains <10 µV offset drift in torque sensing chain during vehicle key-off, meeting ISO 26262 ASIL-B diagnostic coverage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AXC1T45QDCKRQ1 | Lower ICC (1.5 µA max @ 125°C), identical pinout and function but uses advanced AXC process for reduced dynamic power. | Preferred for ultra-low-power always-on modules (e.g., telematics wake-up logic) where sub-µA sleep current is critical. | Select SN74AXC1T45QDCKRQ1 when optimizing for lowest possible quiescent current without changing layout or firmware. |
| TXS0101QPWRQ1 | Open-drain B port, push-pull A port; no Schmitt triggers; lower drive strength (8 mA); lacks Ioff-float isolation. | Suitable for simple 1.8-V ↔ 3.3-V I²C buffering but not for high-speed or noise-prone environments requiring hysteresis or robust isolation. | Choose TXS0101QPWRQ1 only for low-speed, low-noise I²C expansion where Schmitt inputs and Ioff-float are unnecessary. |
Compared with SN74AXC1T45QDCKRQ1, the SN74LXC1T45QDCKRQ1 offers higher drive strength (32 mA vs. 24 mA) and broader VCC tolerance (1.1–5.5 V vs. 0.65–3.6 V), making it more suitable for mixed-voltage actuator interfaces; versus TXS0101QPWRQ1, it provides deterministic noise immunity and fail-safe isolation essential for functional safety-critical paths.
Availability
SN74LXC1T45QDCKRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, ADAS sensor hubs, infotainment display interfaces, and electric power steering systems requiring stable component supply across extended temperature and long production lifecycles.
Supply support for SN74LXC1T45QDCKRQ1 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 automotive, industrial, and personal electronics markets.
The SN74LXC1T45QDCKRQ1 belongs to TI's automotive-qualified LXC logic family, designed specifically for robust, low-power, mixed-voltage signal translation in safety-critical vehicle subsystems operating from –40°C to +125°C.
FAQ
What is the maximum supported data rate for SN74LXC1T45QDCKRQ1 in 3.3-V-to-5-V translation?
The SN74LXC1T45QDCKRQ1 supports up to 420 Mbps in 3.3 V → 5.0 V up-translation mode, as specified in Section 6.12 of the datasheet under TMAX conditions with 50% duty cycle input and valid pulse thresholds. This performance is validated across –40°C to +125°C and applies specifically to the SN74LXC1T45QDCKRQ1 device in its SC70 package.
Does SN74LXC1T45QDCKRQ1 require external pull-up or pull-down resistors on its I/O pins?
No, the SN74LXC1T45QDCKRQ1 integrates dynamic pull-down resistors on both A and B I/O pins and a static pull-down on the DIR input. These eliminate the need for external biasing components, reducing BOM count and PCB footprint-confirmed in the Features section and Table 5-1 of the SN74LXC1T45QDCKRQ1 datasheet.
How does the VCC isolation (Ioff-float) feature behave when VCCA is disconnected while VCCB remains powered?
When VCCA drops below 100 mV (e.g., disconnected) while VCCB remains active, the SN74LXC1T45QDCKRQ1 forces both A and B I/Os into a weak pull-down state and then transitions them to high-impedance. This prevents back-current flow and protects downstream circuitry-detailed in Section 8.3 and Table 6.5 (Ioff-float current ≤2.5 µA).
Is SN74LXC1T45QDCKRQ1 compatible with legacy LVC-level shifters in pinout and function?
Yes, the SN74LXC1T45QDCKRQ1 is explicitly stated as compatible with the LVC family level shifters in the Features section. It shares identical 6-pin SC70 (DCK) pinout, same DIR-controlled bidirectional operation, and overlapping voltage ranges (1.1–5.5 V), enabling drop-in replacement in existing LVC-based designs without layout changes.
What is the input hysteresis (ΔVT) of SN74LXC1T45QDCKRQ1 at 1.8-V supply, and why does it matter?
At VCCA = VCCB = 1.8 V, the SN74LXC1T45QDCKRQ1 exhibits ΔVT = 0.3 V (VT+ = 1.13 V, VT− = 0.83 V), per Table 6.5. This hysteresis rejects noise and contact bounce in mechanical interfaces-critical for reliable switch debouncing in automotive door modules or seat position sensors where signal integrity cannot rely on software filtering alone.
SN74LXC1T45QDCKRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 1
- Voltage - VCCA:
- 1.1 V ~ 5.5 V
- Voltage - VCCB:
- 1.1 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Non-Inverted
- Data Rate:
- 420Mbps
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TSSOP, SC-88, SOT-363
SN74LXC1T45QDCKRQ1 FAQ
1.How can I place an order for SN74LXC1T45QDCKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LXC1T45QDCKRQ1 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 SN74LXC1T45QDCKRQ1 reliable?
The price and inventory of SN74LXC1T45QDCKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LXC1T45QDCKRQ1 is usually 5 days.
3.What payment methods are accepted for SN74LXC1T45QDCKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LXC1T45QDCKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LXC1T45QDCKRQ1?
SN74LXC1T45QDCKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LXC1T45QDCKRQ1 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 SN74LXC1T45QDCKRQ1?
For technical support, including SN74LXC1T45QDCKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LXC1T45QDCKRQ1 requirements.
6.How does Aetrix verify that SN74LXC1T45QDCKRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74LXC1T45QDCKRQ1 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 SN74LXC1T45QDCKRQ1 meets industry standards.
7.What is the process for return or replacement of SN74LXC1T45QDCKRQ1?
All SN74LXC1T45QDCKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LXC1T45QDCKRQ1, 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 SN74LXC1T45QDCKRQ1 part is unused and in its original packaging.
Return procedure for SN74LXC1T45QDCKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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