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Texas Instruments SN74LXC1T45QDRYRQ1
- Part No.:
- SN74LXC1T45QDRYRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LXC1T45QDRYRQ1.pdf
- Description:
- AUTOMOTIVE, SINGLE-BIT DUAL-SUPP
- Quantity:
- Payment:
- Shipping:
Inventory:4,749
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Product details
Overview
SN74LXC1T45QDRYRQ1 from Texas Instruments is an automotive-grade, single-bit dual-supply bidirectional bus transceiver enabling configurable level shifting between 1.1 V and 5.5 V logic domains. It supports up to 420 Mbps (3.3 V → 5.0 V), features Schmitt-trigger inputs for noise immunity, integrated dynamic pull-downs on I/Os, and static pull-downs on DIR control input. It operates across –40°C to +125°C and is used in automotive infotainment power-domain interfacing.
For engineers reviewing the SN74LXC1T45QDRYRQ1 datasheet, SN74LXC1T45QDRYRQ1 pinout, SN74LXC1T45QDRYRQ1 application, or SN74LXC1T45QDRYRQ1 equivalent, key selection criteria include dual-rail voltage flexibility (VCCA/VCCB = 1.1–5.5 V), VCC isolation with Ioff-float, ±4000-V HBM ESD rating, and AEC-Q100 Grade 1 qualification for automotive systems.
Technical Context
The SN74LXC1T45QDRYRQ1 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 Schmitt-trigger inputs providing hysteresis (ΔVT = 0.2–1.06 V) to reject slow/noisy signals.
Its robust power sequencing tolerates arbitrary VCCA/VCCB ramp order, and the Ioff-float feature ensures high-impedance I/O states when either supply drops below 100 mV-critical for hot-swap and partial-power-down operation in automotive ECUs and ADAS modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range (VCCA/VCCB) | 1.1 V to 5.5 V - Enables interoperability across mixed-voltage subsystems (e.g., 1.2-V MCU ↔ 3.3-V sensor, 1.8-V FPGA ↔ 5.0-V display driver). |
| Max Data Rate | 420 Mbps (3.3 V → 5.0 V) - Supports high-speed serial control links such as GPIO-based SPI clock extension or debug interface bridging. |
| Propagation Delay (tpd) | 1 ns (min) to 15 ns (max) - Ensures timing-critical signal integrity in real-time automotive control loops with sub-20-ns latency budgets. |
| Ioff-float Current | ≤ ±2.5 µA (–40°C to 125°C) - Guarantees safe I/O isolation during supply brownout or hot-plug events without external clamping. |
| ESD Rating | ±4000-V HBM, ±1000-V CDM - Meets AEC-Q100 stress requirements for under-hood and cabin electronics exposed to human handling. |
| Operating Temp | –40°C to +125°C - Qualified for engine control units, body controllers, and ADAS domain controllers per AEC-Q100 Grade 1. |
| Supply Current (ICC) | ≤ 6 µA (–40°C to 125°C) - Enables always-on wake-up signaling in low-power automotive gateway nodes without battery drain penalty. |
Pinout & Package
SN74LXC1T45QDRYRQ1 is packaged in a 6-pin SON (DRY) package measuring 1.45 mm × 1.00 mm, optimized for space-constrained automotive PCB layouts and thermal performance (RθJA = 293.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply rail | Reference for DIR control logic and A-port I/O thresholds; must be stable within 1.1–5.5 V for correct direction control and input sampling. |
| 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 (A-side) | Connects to VCCA-referenced logic (e.g., MCU GPIO); accepts 1.1–5.5 V inputs and drives compatible outputs with 32-mA max drive strength. |
| B | Bidirectional I/O (B-side) | Connects to VCCB-referenced logic (e.g., sensor, display); independent voltage tracking enables true dual-rail translation without level-shifter ICs. |
| DIR | Direction control input | Referenced to VCCA; high = A→B, low = B→A; internal static pull-down allows floating control in default-B-to-A mode. |
| VCCB | B-port supply rail | Reference for B-port I/O thresholds; decoupling required near pin to maintain signal integrity during fast edge transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable dual-rail operation | Independent VCCA/VCCB from 1.1 V to 5.5 V enables direct interface between legacy 5-V sensors and modern 1.2-V SoCs without external regulators. |
| Schmitt-trigger inputs | Input hysteresis (ΔVT ≥ 0.2 V) rejects noise on long traces or mechanical switch bounce, eliminating need for external RC filtering in body-control modules. |
| VCC isolation (Ioff-float) | Automatic high-Z I/O state when either VCCA or VCCB < 100 mV prevents back-driving and latch-up during power sequencing or fault conditions. |
| Integrated pull-down resistors | Dynamic pull-downs on A/B I/Os and static pull-down on DIR reduce external component count and ensure defined logic states during reset or unpowered states. |
| AEC-Q100 Grade 1 qualified | Validated for automotive applications requiring operation up to +125°C ambient, including powertrain, chassis, and ADAS control units. |
Applications
| Automotive Infotainment Interface | ADAS Sensor Hub Bridging |
|---|---|
Use Scenario: Interfacing a 1.8-V application processor with a 3.3-V touchscreen controller in a head-unit system. IC Role / Device Role: Bidirectional level translator managing SPI/UART control lines while maintaining signal integrity across voltage domains. Use Value: Eliminates need for discrete MOSFET translators or dual-supply buffers, reducing BOM cost and PCB area by >40% in tight-layout infotainment modules. | Use Scenario: Connecting a 5.0-V radar sensor output to a 1.2-V domain controller ADC input in a front-camera fusion module. IC Role / Device Role: Unidirectional (B→A) level shifter with Schmitt-trigger input to suppress EMI-induced glitches on long harness traces. Use Value: Prevents false trigger events caused by automotive EMI; hysteresis margin exceeds ISO 11452-4 test levels without additional filtering. |
| Body Control Module I/O Expansion | Electric Power Steering (EPS) Diagnostic Link |
Use Scenario: Extending GPIO count of a 3.3-V microcontroller to drive 5.0-V LED indicators and buzzers in door modules. IC Role / Device Role: Level-shifting buffer with 32-mA drive strength supporting direct LED/buzzer actuation without external drivers. Use Value: Reduces component count by replacing discrete transistor switches and current-limiting resistors, improving reliability and thermal margin. | Use Scenario: Isolating diagnostic UART lines between a 5.0-V EPS motor controller and a 1.8-V vehicle gateway during firmware updates. IC Role / Device Role: Direction-controlled translator enabling bidirectional UDS communication while enforcing VCC isolation during gateway sleep mode. Use Value: Ensures zero leakage into powered-down gateway during vehicle off-state, meeting ISO 19453-3 quiescent current 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 |
|---|---|---|---|
| SN74AVC1T45QDRYRQ1 | Lower VCC range (1.2–3.6 V), no Schmitt triggers, higher ICC (12 µA max), same 6-pin SON package. | Limited to mid-voltage automotive domains (e.g., 1.2–3.3 V only); unsuitable for 5-V sensor interfaces or noisy environments. | Select when cost sensitivity outweighs noise immunity needs and full 1.1–5.5 V range is unnecessary. |
| TXS0101QPWRQ1 | Auto-direction sensing (no DIR pin), lower drive (8 mA), higher propagation delay (up to 25 ns), same AEC-Q100 Grade 1 rating. | Eliminates DIR control wiring but adds latency; not suitable for deterministic timing-critical paths like CAN FD auxiliary control. | Prefer for simple push-button or I²C-like interfaces where direction is predictable and speed < 100 Mbps suffices. |
Compared with SN74AVC1T45QDRYRQ1 and TXS0101QPWRQ1, SN74LXC1T45QDRYRQ1 uniquely delivers full 1.1–5.5 V dual-rail support with Schmitt-trigger noise immunity and sub-15-ns propagation-making it the only option for robust, high-speed, mixed-voltage automotive control links requiring deterministic direction control.
Availability
SN74LXC1T45QDRYRQ1 is available at Aetrix Electronics and suitable for automotive infotainment interface, ADAS sensor hub bridging, and body control module I/O expansion requiring stable component supply and AEC-Q100-compliant sourcing.
Supply support for SN74LXC1T45QDRYRQ1 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, with deep expertise in automotive electronics and AEC-Q100-qualified product development.
The SN74LXC1T45QDRYRQ1 belongs to TI's LXC logic family-designed specifically for low-voltage, high-noise-immunity automotive signal translation with guaranteed operation down to 1.1 V and robust hot-swap capability.
FAQ
What is the maximum supported data rate for SN74LXC1T45QDRYRQ1 in 3.3-V-to-5.0-V up-translation?
The SN74LXC1T45QDRYRQ1 supports up to 420 Mbps in 3.3-V-to-5.0-V up-translation mode, as specified in Section 6.12 (TMAX) of the SCES943 datasheet. This performance is validated across the full automotive temperature range (–40°C to +125°C) with 50% duty cycle input and defined pulse amplitude thresholds. The actual achievable rate depends on PCB layout, termination, and load capacitance.
Does SN74LXC1T45QDRYRQ1 require external pull-up or pull-down resistors on its DIR pin?
No, SN74LXC1T45QDRYRQ1 includes an integrated static pull-down resistor on the DIR pin, allowing it to be left floating for default B-to-A direction operation. This eliminates external components and simplifies design in applications like diagnostic interfaces where direction is fixed during normal operation. The pull-down ensures a defined logic-low state even with no external bias.
How does the VCC isolation (Ioff-float) feature behave when VCCA is disconnected and VCCB remains at 3.3 V?
When VCCA drops below 100 mV (e.g., disconnected) while VCCB remains at 3.3 V, the SN74LXC1T45QDRYRQ1 pulls both A and B I/Os weakly low, then places them in high-impedance state. This prevents back-current flow into the unpowered VCCA domain and avoids bus contention-critical for hot-swap scenarios in automotive gateways and domain controllers.
Can SN74LXC1T45QDRYRQ1 translate between 1.1 V and 5.5 V simultaneously on the same device?
Yes, SN74LXC1T45QDRYRQ1 supports simultaneous 1.1-V (VCCA) and 5.5-V (VCCB) operation. Its fully configurable dual-rail architecture allows A-port logic to track 1.1 V while B-port logic tracks 5.5 V, enabling direct interface between ultra-low-power sensors and legacy 5-V actuators without intermediate voltage conversion stages.
Is SN74LXC1T45QDRYRQ1 pin-compatible with other 6-pin SON level shifters in TI's portfolio?
SN74LXC1T45QDRYRQ1 uses the standard 6-pin SON (DRY) footprint (1.45 mm × 1.00 mm), matching SN74AVC1T45QDRYRQ1 and TXS0101QPWRQ1. However, pin functions differ: DIR is referenced to VCCA (not VCCB), and GND is pin 2-not pin 3-so PCB layout reuse requires verification against the specific pinout table in SCES943 Figure 5-3.
SN74LXC1T45QDRYRQ1 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-UFDFN
SN74LXC1T45QDRYRQ1 FAQ
1.How can I place an order for SN74LXC1T45QDRYRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LXC1T45QDRYRQ1 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 SN74LXC1T45QDRYRQ1 reliable?
The price and inventory of SN74LXC1T45QDRYRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LXC1T45QDRYRQ1 is usually 5 days.
3.What payment methods are accepted for SN74LXC1T45QDRYRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LXC1T45QDRYRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LXC1T45QDRYRQ1?
SN74LXC1T45QDRYRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LXC1T45QDRYRQ1 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 SN74LXC1T45QDRYRQ1?
For technical support, including SN74LXC1T45QDRYRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LXC1T45QDRYRQ1 requirements.
6.How does Aetrix verify that SN74LXC1T45QDRYRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74LXC1T45QDRYRQ1 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 SN74LXC1T45QDRYRQ1 meets industry standards.
7.What is the process for return or replacement of SN74LXC1T45QDRYRQ1?
All SN74LXC1T45QDRYRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LXC1T45QDRYRQ1, 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 SN74LXC1T45QDRYRQ1 part is unused and in its original packaging.
Return procedure for SN74LXC1T45QDRYRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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