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Texas Instruments SN74LXC1T45DTQR
- Part No.:
- SN74LXC1T45DTQR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LXC1T45DTQR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 6X2SON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LXC1T45 from Texas Instruments is a single-bit, dual-supply noninverting bidirectional bus transceiver enabling voltage level translation between 1.1 V and 5.5 V logic domains. It features independent VCCA and VCCB rails, Schmitt-trigger inputs for noise immunity, integrated dynamic pull-downs on I/Os, static pull-downs on DIR control, and VCC isolation (Ioff-float) for partial power-down operation. It supports up to 420 Mbps in 3.3 V → 5.0 V translation and operates across –40°C to +125°C.
For engineers reviewing the SN74LXC1T45 datasheet, SN74LXC1T45 pinout, SN74LXC1T45 application, or SN74LXC1T45 equivalent, this device is selected for low-power, space-constrained I/O bridging in mixed-voltage microcontroller interfaces, sensor hubs, and battery-powered IoT edge nodes where supply sequencing robustness and input noise tolerance are critical.
Technical Context
The SN74LXC1T45 implements a fully configurable dual-rail architecture: A-port I/O and DIR control are referenced to VCCA (1.1–5.5 V), while B-port I/O is referenced to VCCB (1.1–5.5 V). Directional data flow (A↔B) is controlled solely by the DIR signal, with no OE pin - enabling simplified two-wire level-shifting without external enable logic.
Its Schmitt-trigger inputs provide hysteresis (ΔVT = 0.2–1.06 V depending on VCCI), rejecting slow edges and noise up to ±100 mV. The Ioff-float feature ensures all I/Os enter high-impedance state when either VCCA or VCCB drops below 100 mV, preventing backfeeding and enabling safe hot-insertion in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range (VCCA/VCCB) | 1.1 V to 5.5 V per rail - enables direct interfacing between sub-1.2 V MCUs and 5 V peripherals without external regulators. |
| Max Data Rate | 420 Mbps (3.3 V → 5.0 V) - supports high-speed serial control links like I²C clock stretching or SPI command forwarding. |
| Propagation Delay (tpd) | 1 ns (min) to 15 ns (max) at 3.3 V/3.3 V - ensures timing-critical bidirectional handshaking meets sub-20 ns round-trip latency budgets. |
| Ioff Current | ≤2.5 µA (–40°C to 125°C) - guarantees ultra-low leakage during system sleep modes, preserving battery life in portable devices. |
| ESD Protection | ±4000 V HBM, ±1000 V CDM - meets industrial IEC 61000-4-2 Level 4 requirements without external TVS diodes. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive modules, industrial PLC I/O cards, and outdoor wireless gateways. |
Pinout & Package
X2SON-6 package (1.00 mm × 0.80 mm, 0.35 mm height) - optimized for ultra-dense PCB layouts in wearables and compact sensor nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply rail | Reference for A I/O and DIR control logic; must be stable before signal assertion to avoid metastability. |
| VCCB | B-port supply rail | Reference for B I/O only; independent of VCCA - allows true asymmetric level shifting (e.g., 1.8 V MCU ↔ 5 V display driver). |
| GND | Common ground reference | Shared return path for both rails; no separate ground pins - simplifies layout but requires low-impedance shared GND plane. |
| A | Bidirectional data port A | I/O referenced to VCCA; accepts 1.1–5.5 V signals; integrates dynamic pull-down for floating-bus termination. |
| DIR | Direction control input | Referenced to VCCA; high = A→B, low = B→A; includes static pull-down to prevent floating-state misdirection. |
| B | Bidirectional data port B | I/O referenced to VCCB; accepts 1.1–5.5 V signals; supports same drive strength (32 mA) as A port at 5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | Input hysteresis (ΔVT) ≥0.2 V ensures reliable switching on slow or noisy signals (e.g., mechanical switch debouncing, long traces). |
| VCC isolation (Ioff-float) | Automatic high-Z I/O state when either VCCA or VCCB <100 mV - eliminates need for external isolation switches in multi-rail power sequencing. |
| Integrated pull-down resistors | Dynamic pull-downs on A/B I/Os + static pull-down on DIR reduce external component count by ≥3 passives per channel. |
| Low quiescent current | 3 µA max at 25°C - extends battery runtime in always-on sensor nodes without sacrificing translation performance. |
| Robust supply sequencing | No power-up order dependency between VCCA and VCCB - simplifies PMIC design and avoids latch-up during cold-start. |
Applications
| MCU-to-Peripheral Bridging | Mechanical Switch Debouncing |
|---|---|
Use Scenario: Interfacing a 1.8 V ARM Cortex-M0+ microcontroller GPIO to a legacy 5 V UART transceiver or LED driver IC. IC Role / Device Role: Bidirectional level translator ensuring signal integrity across incompatible voltage domains without timing skew. Use Value: Eliminates need for discrete MOSFET translators or dual-supply buffers, reducing BOM cost and board area by >40%. | Use Scenario: Conditioning pushbutton inputs connected to long cables in an industrial HMI panel exposed to EMI. IC Role / Device Role: Input conditioner with Schmitt-trigger hysteresis and integrated pull-down, replacing RC + inverter solutions. Use Value: Reduces external components from 4 (resistor, capacitor, inverter, pull-up) to zero - improving reliability and easing IPC Class 3 assembly. |
| Sensor Hub Voltage Translation | Battery-Powered IoT Node I/O Expansion |
Use Scenario: Aggregating 1.2 V MEMS accelerometer, 3.3 V environmental sensor, and 5 V actuator signals into a single 3.3 V MCU host interface. IC Role / Device Role: Multi-rail I/O translator enabling simultaneous domain bridging with independent VCCA/VCCB configuration. Use Value: Supports concurrent translation across three voltage domains using one device per signal pair - cuts routing complexity and layer count. | Use Scenario: Adding GPIO expansion to a coin-cell-powered BLE module where every µA of quiescent current impacts 10-year battery life. IC Role / Device Role: Ultra-low-IQ bidirectional buffer with Ioff-float, maintaining isolation during deep-sleep states. Use Value: Achieves 3 µA max ICCA+ICCB - 5× lower than comparable LVC translators - directly extending operational lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXB0101DGSR | Auto-direction sensing (no DIR pin); higher ICC (10 µA typ); no Schmitt inputs; 1.2–3.6 V only. | Best for simple unidirectional or auto-sensed data paths; unsuitable for noisy environments or >3.6 V domains. | Select SN74LXC1T45 when DIR-controlled deterministic direction, Schmitt noise immunity, or 5 V compatibility is required. |
| SN74AVC1T45DBVR | Lower drive (12 mA), no Ioff-float, narrower VCC range (1.2–3.6 V), no integrated pull-downs on DIR. | Targeted at cost-sensitive consumer apps with tight voltage margins; lacks robustness for industrial hot-swap or wide-VCC designs. | Choose SN74LXC1T45 for extended voltage range, guaranteed Ioff isolation, and reduced external component count. |
Compared with TXB0101DGSR and SN74AVC1T45DBVR, the SN74LXC1T45 delivers wider voltage support (1.1–5.5 V), deterministic DIR control for synchronous protocols, and integrated protection features - making it the preferred choice for ruggedized, multi-domain embedded systems requiring long-term supply continuity.
Availability
SN74LXC1T45 is available at Aetrix Electronics and suitable for industrial automation interfaces, automotive body electronics, and medical sensor subsystems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74LXC1T45 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, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The SN74LXC1T45 belongs to TI's LXC logic family - engineered for ultra-low-power, high-noise-immunity level translation in space- and energy-constrained edge devices.
FAQ
What is the minimum operating voltage for SN74LXC1T45 on either VCCA or VCCB?
The SN74LXC1T45 supports a minimum supply voltage of 1.1 V on both VCCA and VCCB rails, enabling interoperability with next-generation sub-1.2 V microcontrollers and low-power sensors. This specification is validated across the full –40°C to +125°C temperature range per TI SCES934A datasheet Section 6.3.
Does SN74LXC1T45 require external pull-up or pull-down resistors on its DIR pin?
No. The SN74LXC1T45 integrates a static pull-down resistor on the DIR input, allowing the pin to be left floating without risk of undefined direction state. This eliminates the need for an external pull-down resistor, reducing component count and PCB footprint - a key advantage over legacy translators like SN74AVC1T45.
How does the Ioff-float feature function in SN74LXC1T45 during power-down sequences?
When either VCCA or VCCB falls below 100 mV, the SN74LXC1T45 automatically pulls all I/Os (A and B) to GND via internal dynamic resistors, then transitions them to high-impedance. This prevents back-current flow and signal contention during asymmetric power-down - a critical capability verified in TI's application note SBAA354 for hot-plug and partial-power-down systems.
What is the maximum data rate supported by SN74LXC1T45 in 1.8 V to 3.3 V level translation?
In 1.8 V → 3.3 V up-translation mode, the SN74LXC1T45 supports a maximum data rate of 210 Mbps, as specified in Table 6.12 of the TI SCES934A datasheet. This is measured under 50% duty cycle, with 20% pulse thresholds defined relative to VCCO, and applies across the full –40°C to +125°C operating range.
Can SN74LXC1T45 be used in automotive applications requiring AEC-Q100 qualification?
The SN74LXC1T45 is not AEC-Q100 qualified. It is rated for industrial temperature (–40°C to +125°C) and meets JESD 78 Class II latch-up and JESD 22 ESD standards, but lacks automotive-specific stress testing and documentation. For AEC-Q100-compliant alternatives, consult TI's automotive-grade level shifters such as the SN74AXC1T45-Q1.
SN74LXC1T45DTQR 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:
- 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:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-XFDFN
SN74LXC1T45DTQR FAQ
1.How can I place an order for SN74LXC1T45DTQR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LXC1T45DTQR 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 SN74LXC1T45DTQR reliable?
The price and inventory of SN74LXC1T45DTQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LXC1T45DTQR is usually 5 days.
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Once your SN74LXC1T45DTQR 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 SN74LXC1T45DTQR?
For technical support, including SN74LXC1T45DTQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LXC1T45DTQR requirements.
6.How does Aetrix verify that SN74LXC1T45DTQR is sourced from the original manufacturer or authorized distributors?
All SN74LXC1T45DTQR 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 SN74LXC1T45DTQR meets industry standards.
7.What is the process for return or replacement of SN74LXC1T45DTQR?
All SN74LXC1T45DTQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LXC1T45DTQR, 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 SN74LXC1T45DTQR part is unused and in its original packaging.
Return procedure for SN74LXC1T45DTQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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