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Texas Instruments SN74LVC1T45TDCKRQ1
- Part No.:
- SN74LVC1T45TDCKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC1T45TDCKRQ1.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL SC70-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVC1T45TDCKRQ1 from Texas Instruments is an automotive-qualified, single-bit, dual-supply noninverting bus transceiver enabling bidirectional level translation between 1.65V and 5.5V domains. It features VCCA/VCCB dual-rail operation, ±24mA drive at 3.3V, VCC isolation, and Ioff for partial-power-down support. It is deployed in ADAS camera interfaces requiring robust 1.8V ↔ 3.3V signal bridging.
For engineers reviewing the SN74LVC1T45TDCKRQ1 datasheet, SN74LVC1T45TDCKRQ1 pinout, SN74LVC1T45TDCKRQ1 application, or SN74LVC1T45TDCKRQ1 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification (–40°C to +125°C), DIR-referenced-to-VCCA control logic, 420Mbps max data rate (3.3V→5V), VCC isolation behavior, and SC70-6 package compatibility with high-density automotive PCB layouts.
Technical Context
The SN74LVC1T45TDCKRQ1 implements a fully configurable dual-rail architecture where the A-port tracks VCCA (1.65V–5.5V) and B-port tracks VCCB (1.65V–5.5V), enabling translation across 1.8V/2.5V/3.3V/5V nodes without external biasing. DIR input is referenced solely to VCCA, decoupling direction control from B-side supply conditions.
VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB = GND, preventing backdrive during power sequencing. Ioff circuitry limits leakage to ±10µA over temperature when either supply is at 0V, supporting safe partial-power-down in multi-rail automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | VCCA and VCCB each support 1.65V to 5.5V independently - enables universal 1.8V↔2.5V↔3.3V↔5V bidirectional translation |
| Max Data Rate | 420Mbps (3.3V→5V) - supports high-speed sensor interface timing in head unit and ADAS camera links |
| Output Drive | ±24mA at 3.3V - sufficient to drive 50Ω transmission lines or multiple CMOS loads without external buffers |
| ESD Rating | HBM Class H2 (±2kV), CDM Class C3B (±750V) - meets AEC-Q100 stress requirements for automotive assembly and field operation |
| Operating Temp | –40°C to +125°C ambient - qualified for engine bay, infotainment, and ADAS ECU environments |
| Ioff Leakage | ±10µA max at –40°C to +125°C with one supply at 0V - prevents damaging back-current during staggered power-up/down |
| Propagation Delay | tPLH/tPHL ≤ 10.2ns (A→B, VCCA=3.3V, VCCB=5V) - ensures sub-10ns timing margin for 100MHz+ digital interfaces |
Pinout & Package
SN74LVC1T45TDCKRQ1 is housed in a 6-pin SC70 (DCK) package measuring 2.0mm × 2.1mm, optimized for space-constrained automotive modules. Thermal resistance RθJA = 210.9°C/W supports operation up to 125°C ambient with minimal board-level heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | Power supply for A-port and DIR input | Defines A-port I/O voltage range and sets reference for DIR logic threshold; must be stable before DIR assertion |
| GND | Ground reference | Common return path for both rails; requires low-inductance connection to minimize ground bounce in bidirectional switching |
| A | Configurable I/O port (A-side) | Bi-directional data terminal tracking VCCA; functions as input or output depending on DIR state |
| B | Configurable I/O port (B-side) | Bi-directional data terminal tracking VCCB; electrically isolated from VCCA domain except through translation logic |
| DIR | Direction control input | Logic level referenced to VCCA: HIGH enables A→B transfer, LOW enables B→A transfer; no internal pullup/pulldown |
| VCCB | Power supply for B-port | Defines B-port I/O voltage range; independent of VCCA - allows asymmetric rail configurations (e.g., VCCA=3.3V, VCCB=1.8V) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Enables interoperability between mixed-voltage subsystems (e.g., 1.8V camera sensor ↔ 3.3V image processor) without level-shifter ICs or discrete solutions |
| VCC isolation | Prevents cross-rail contention during power sequencing: if VCCA or VCCB = GND, both A and B ports go Hi-Z - eliminates need for external isolation logic |
| Ioff partial-power-down | Blocks current flow into powered-down rails (≤±10µA leakage), protecting downstream devices during sleep/wake transitions in telematics gateways |
| AEC-Q100 Grade 1 qualification | Validated for continuous operation from –40°C to +125°C ambient with HBM/CDM ESD robustness - suitable for under-hood and display module deployments |
| Glitch-free power sequencing | Eliminates false logic transitions during asynchronous VCCA/VCCB ramp-up/down - prevents spurious resets or misconfigurations in safety-critical ADAS paths |
Applications
| ADAS Camera Interface | Automotive Head Unit |
|---|---|
Use Scenario: Bridging MIPI CSI-2 D-PHY signals between a 1.8V image sensor and a 3.3V video processor in a surround-view system. IC Role / Device Role / Timing Role: Bidirectional level translator managing clock and data lanes with sub-10ns propagation delay and glitch-free direction switching. Use Value: Enables direct sensor-to-processor connectivity without retiming or protocol conversion, reducing latency and BOM count. | Use Scenario: Interfacing a 5V microcontroller UART with a 3.3V Bluetooth module in an infotainment head unit. IC Role / Device Role / Timing Role: Unidirectional or bidirectional logic-level shifter handling start-stop framing at up to 3Mbps with robust noise immunity. Use Value: Eliminates risk of overvoltage damage to the 3.3V radio while maintaining full UART timing compliance and ESD resilience. |
| Telematics Control Unit | Body Control Module (BCM) |
Use Scenario: Translating LIN bus signals between a 12V-regulated 5V MCU and a 2.5V CAN/LIN transceiver in a cellular-connected TCU. IC Role / Device Role / Timing Role: Voltage-domain isolator for low-speed control signals, leveraging VCC isolation to prevent backfeed during MCU reset sequences. Use Value: Ensures reliable LIN communication startup after cold boot, even when transceiver power ramps before MCU core voltage. | Use Scenario: Level-shifting PWM outputs from a 5V body controller MCU to 12V LED driver inputs via a 3.3V intermediate regulator stage. IC Role / Device Role / Timing Role: Robust signal translator supporting 100kHz+ PWM edges with <10ns skew between rising/falling transitions. Use Value: Maintains precise dimming resolution and flicker-free operation across varying battery voltages (9V–16V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0101QPWRQ1 | Auto-direction sensing (no DIR pin); lower drive (±2mA); supports 1.2V–3.6V only | Suitable for low-speed, low-current I²C/SMBus; not for high-speed or high-drive applications | Select SN74LVC1T45TDCKRQ1 when DIR control, >±10mA drive, or >3.6V translation is required |
| NLSX4014DR2G | 4-channel, auto-bidirectional; 1.65V–4.5V range; ±8mA drive; no AEC-Q100 qualification | Used in consumer-grade infotainment displays; lacks automotive temp/ESD validation | Choose SN74LVC1T45TDCKRQ1 for AEC-Q100-compliant designs requiring single-channel precision and higher drive |
Compared with TXS0101QPWRQ1 and NLSX4014DR2G, SN74LVC1T45TDCKRQ1 provides deterministic DIR-controlled directionality, 3× higher output drive, extended 5.5V support, and full AEC-Q100 Grade 1 qualification - making it the preferred choice for safety-aware, high-performance automotive signal bridging.
Availability
SN74LVC1T45TDCKRQ1 is available at Aetrix Electronics and suitable for ADAS camera interfaces, automotive head units, and telematics control units requiring stable component supply across extended temperature and long product lifecycles.
Supply support for SN74LVC1T45TDCKRQ1 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 delivering analog and embedded processing solutions for automotive, industrial, personal electronics, and communications markets.
The SN74LVC1T45TDCKRQ1 belongs to TI's automotive-qualified LVC logic family, engineered specifically for robust voltage translation in safety-critical vehicle subsystems operating across wide thermal and supply ranges.
FAQ
What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of the SN74LVC1T45TDCKRQ1?
The SN74LVC1T45TDCKRQ1 supports any combination of VCCA and VCCB within 1.65V to 5.5V - including cases where VCCA = 1.65V and VCCB = 5.5V (3.85V difference). No derating is required per datasheet Section 5.3 Recommended Operating Conditions, as the device is explicitly designed for full-range asymmetric rail operation.
Does the SN74LVC1T45TDCKRQ1 require external pull-up or pull-down resistors on the A or B ports?
No external pull-up or pull-down resistors are required for basic operation of the SN74LVC1T45TDCKRQ1. However, in bidirectional applications (e.g., Figure 7-3), external passive termination may be needed on shared buses to define idle states during Hi-Z intervals - especially when transitioning direction via the DIR pin to avoid bus contention.
How does the VCC isolation feature behave when VCCA = 0V but VCCB remains powered on the SN74LVC1T45TDCKRQ1?
When VCCA = 0V (GND), the SN74LVC1T45TDCKRQ1 forces both A and B ports into high-impedance regardless of VCCB voltage or DIR state. This prevents back-driving the A-port and protects upstream 1.65V–5.5V circuitry - a critical safeguard during MCU reset sequences where VCCA may collapse before VCCB.
Can the SN74LVC1T45TDCKRQ1 translate signals between 1.2V and 3.3V logic domains?
No. The SN74LVC1T45TDCKRQ1 minimum supply voltage is 1.65V per rail. Translation involving 1.2V domains is outside its specified operating range and violates Absolute Maximum Ratings (Section 5.1), risking unreliable switching or increased leakage. For 1.2V interfaces, consider TI's TXB0101 or similar 1.2V-compatible translators.
Is the DIR pin of the SN74LVC1T45TDCKRQ1 5V-tolerant when VCCA = 3.3V?
Yes. The DIR input is referenced to VCCA and rated for VIH = VCCA × 0.7 (min) and VIL = VCCA × 0.3 (max) per Section 5.3. With VCCA = 3.3V, VIH(min) = 2.31V - meaning a 5V logic HIGH applied to DIR will be recognized correctly as long as it exceeds 2.31V and stays within Absolute Maximum Rating of 6.5V. No level shifting is needed for 5V control signals.
SN74LVC1T45TDCKRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 1
- 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 ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TSSOP, SC-88, SOT-363
SN74LVC1T45TDCKRQ1 FAQ
1.How can I place an order for SN74LVC1T45TDCKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC1T45TDCKRQ1 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 SN74LVC1T45TDCKRQ1 reliable?
The price and inventory of SN74LVC1T45TDCKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC1T45TDCKRQ1 is usually 5 days.
3.What payment methods are accepted for SN74LVC1T45TDCKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC1T45TDCKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC1T45TDCKRQ1?
SN74LVC1T45TDCKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC1T45TDCKRQ1 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 SN74LVC1T45TDCKRQ1?
For technical support, including SN74LVC1T45TDCKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC1T45TDCKRQ1 requirements.
6.How does Aetrix verify that SN74LVC1T45TDCKRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74LVC1T45TDCKRQ1 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 SN74LVC1T45TDCKRQ1 meets industry standards.
7.What is the process for return or replacement of SN74LVC1T45TDCKRQ1?
All SN74LVC1T45TDCKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC1T45TDCKRQ1, 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 SN74LVC1T45TDCKRQ1 part is unused and in its original packaging.
Return procedure for SN74LVC1T45TDCKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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