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Texas Instruments SN74LXC1T45DBVR
- Part No.:
- SN74LXC1T45DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LXC1T45DBVR.pdf
- Description:
- IC TRANSLATOR BIDIR SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LXC1T45 from Texas Instruments is a single-bit, dual-supply noninverting bidirectional bus transceiver with configurable level shifting. It enables voltage translation between 1.1 V and 5.5 V logic domains on A and B ports independently, supports up to 420 Mbps (3.3 V → 5.0 V), features Schmitt-trigger inputs for noise immunity, and includes VCC isolation with Ioff-float for partial power-down operation in industrial and automotive systems.
For engineers reviewing the SN74LXC1T45 datasheet, SN74LXC1T45 pinout, SN74LXC1T45 application, or SN74LXC1T45 equivalent, this device is selected for robust dual-rail I/O interfacing where supply sequencing independence, glitch-free operation across wide voltage ranges, and low static current (<6 µA over –40°C to +125°C) are critical design requirements.
Technical Context
The SN74LXC1T45 implements a fully independent dual-supply architecture: VCCA powers the A-port I/O and DIR control logic, while VCCB powers the B-port I/O. Direction control (DIR) is referenced solely to VCCA, enabling deterministic signal flow-high DIR enables A→B transmission, low DIR enables B→A. The transceiver uses dynamic pull-down resistors on I/Os and static pull-downs on DIR to eliminate external biasing.
Its robust power sequencing tolerance arises from VCC isolation: if either VCCA or VCCB drops below 100 mV, all I/Os first pull down then enter high-impedance state. This behavior, combined with JESD78 Class II latch-up immunity (>100 mA) and ±4000-V HBM ESD protection, ensures reliability in mixed-voltage hot-swap and partial-power-down environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range (A/B) | 1.1 V to 5.5 V per port - enables interoperability between ultra-low-voltage MCUs (1.2 V) and legacy 5 V peripherals without level-shifter cascading. |
| Max Data Rate | 420 Mbps (3.3 V → 5.0 V) - supports high-speed interface bridging such as USB PHY signaling or fast GPIO handshaking. |
| Propagation Delay | 1 ns (min) to 15 ns (max) - ensures timing-critical bidirectional data paths meet sub-20 ns round-trip latency budgets. |
| IOFF-float Current | ≤2.5 µA (–40°C to +125°C) - guarantees safe isolation during power sequencing or standby, preventing backfeeding between rails. |
| Input Threshold Hysteresis | 0.2 V to 1.06 V (ΔVT) - provides noise margin >200 mV for slow or noisy mechanical switch inputs or long PCB traces. |
| Drive Strength | ±32 mA at 5 V - directly drives LEDs, small relays, or capacitive loads up to 20 pF without external buffers. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor control, and outdoor embedded applications. |
Pinout & Package
SOT-23-6 package (2.90 mm × 1.60 mm), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply rail | Powers A-port I/O and DIR input logic; sets reference for DIR threshold and A-port output swing. |
| VCCB | B-port supply rail | Powers B-port I/O only; defines B-port output voltage range and input threshold reference. |
| GND | Ground reference | Common return path for both supply domains; required for internal bias generation and ESD protection. |
| A | Bidirectional I/O (A-side) | Connects to 1.1–5.5 V logic domain referenced to VCCA; accepts Schmitt-triggered signals. |
| DIR | Direction control input | Referenced to VCCA only; high = A→B, low = B→A; includes integrated static pull-down for floating-tolerant operation. |
| B | Bidirectional I/O (B-side) | Connects to 1.1–5.5 V logic domain referenced to VCCB; supports same voltage flexibility as A port. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.1–5.5 V operation on A and B ports eliminates need for external regulators or multiple discrete translators. |
| VCC isolation with Ioff-float | Automatic high-impedance transition when either supply falls below 100 mV prevents cross-rail leakage and enables true partial power-down. |
| Schmitt-trigger inputs | Hysteresis ≥0.2 V ensures reliable edge detection on slow-switching or electrically noisy signals (e.g., mechanical switches, long cables). |
| Integrated dynamic pull-downs | Eliminates external 10–100 kΩ pull-down resistors on I/O lines, reducing BOM count and board space in compact designs. |
| Low quiescent current | ≤6 µA max over full temperature range minimizes battery drain in always-on IoT sensor nodes and portable equipment. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Interfacing a 1.8 V microcontroller GPIO to a 5 V analog front-end ADC with shared bidirectional data lines. IC Role / Device Role / Timing Role: Bidirectional level translator managing clock/data handshake between mismatched voltage domains while maintaining signal integrity. Use Value: Enables direct connection without external level-shifting ICs or resistor networks, reducing component count and layout complexity in space-constrained sensor nodes. | Use Scenario: Isolating CAN transceiver control lines (3.3 V MCU) from 5 V lighting driver circuits during ignition sequence power ramp-up. IC Role / Device Role / Timing Role: Voltage-translating isolator ensuring clean direction control of LED drivers despite asynchronous VCCA/VCCB power sequencing. Use Value: Prevents latch-up or false triggering during cold cranking by enforcing VCC isolation and Ioff-float behavior when 5 V rail lags behind 3.3 V MCU supply. |
| IoT Edge Node Power Management | Consumer Wearable Display Interface |
Use Scenario: Enabling selective shutdown of 5 V display subsystem while keeping 1.2 V BLE SoC active in sleep mode. IC Role / Device Role / Timing Role: Partial-power-down gate controlling bidirectional command/status lines between powered and unpowered domains. Use Value: Achieves <1 µA system standby current by leveraging Ioff-float to disconnect idle 5 V circuitry without software intervention or additional PMIC control lines. | Use Scenario: Driving a 3.3 V OLED display's data bus from a 1.1 V wearable SoC with noisy PCB routing near RF sections. IC Role / Device Role / Timing Role: Noise-immune level shifter providing Schmitt-triggered inputs and low-propagation-delay outputs for pixel clock synchronization. Use Value: Eliminates display flicker or ghosting caused by EMI-induced glitches on low-voltage data lines, verified by >200 mV hysteresis margin at 1.1 V operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0101DBVR | Lower max data rate (60 Mbps), no Schmitt-trigger inputs, higher ICC (10 µA typ), lacks VCC isolation | Not suitable for noisy environments or strict partial-power-down use cases requiring Ioff-float | Select SN74LXC1T45 when >100 Mbps throughput, noise immunity, or guaranteed isolation during supply brownout is required. |
| SN74AXC1T45DBVR | Higher drive strength (±48 mA), lower propagation delay (0.8 ns min), identical voltage range and Ioff-float feature | Preferred for driving heavier capacitive loads (>30 pF) or tighter timing budgets (<10 ns round-trip) | Choose SN74LXC1T45 for cost-sensitive, low-power applications where 32 mA drive and 15 ns max tpd are sufficient. |
Compared with TXS0101DBVR and SN74AXC1T45DBVR, the SN74LXC1T45 delivers optimal balance of ultra-low quiescent current (≤6 µA), robust noise immunity via Schmitt inputs, and guaranteed VCC isolation-making it the preferred choice for battery-powered industrial sensors and automotive body electronics where reliability across supply transients is non-negotiable.
Availability
SN74LXC1T45 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and IoT edge node power management requiring stable component supply and long-term lifecycle support.
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 company specializing in analog and embedded processing solutions, with leadership in precision analog, power management, and interface technologies.
The SN74LXC1T45 belongs to TI's LXC logic family, designed specifically for low-voltage, low-power, mixed-signal interfacing in battery-operated and thermally constrained applications across automotive, industrial, and consumer markets.
FAQ
What is the maximum supported data rate for SN74LXC1T45 in 3.3 V to 5.0 V level translation?
The SN74LXC1T45 supports up to 420 Mbps in 3.3 V to 5.0 V up-translation mode, as specified in Section 6.12 of the datasheet under TMAX – Maximum Data Rate. This performance is validated across the full operating temperature range (–40°C to +125°C) with 50% duty cycle input and defined pulse thresholds. The SN74LXC1T45 achieves this using optimized internal drive strength and low-capacitance I/O structures.
Does SN74LXC1T45 require external pull-up or pull-down resistors on its I/O pins?
No, the SN74LXC1T45 does not require external pull-up or pull-down resistors on its A or B I/O pins due to integrated dynamic pull-down resistors. These internal resistors actively hold lines low when undriven, reducing external component count. Similarly, the DIR input includes an integrated static pull-down, allowing it to be left floating without risk of undefined logic states. This feature is confirmed in the "Features" section and electrical characteristics table of the SN74LXC1T45 datasheet.
How does SN74LXC1T45 behave when one supply rail (e.g., VCCB) is disconnected during operation?
When either VCCA or VCCB drops below 100 mV, the SN74LXC1T45 activates its VCC isolation feature: all I/Os (A and B) first pull down and then transition to high-impedance state. This Ioff-float behavior prevents backfeeding, protects downstream circuitry, and enables safe partial-power-down operation. The specification is explicitly defined in the "Features" list and electrical characteristics (Ioff-float parameter) of the SN74LXC1T45 datasheet.
Can SN74LXC1T45 operate with VCCA = 1.1 V and VCCB = 5.5 V simultaneously?
Yes, the SN74LXC1T45 is fully specified to operate with VCCA = 1.1 V and VCCB = 5.5 V simultaneously. Its dual-rail architecture allows independent voltage selection within the 1.1 V to 5.5 V range per port. This configuration is validated in the recommended operating conditions (Section 6.3) and switching characteristics tables (Sections 6.6–6.11) of the SN74LXC1T45 datasheet, supporting robust level translation across the widest possible voltage differential.
What is the input hysteresis (ΔVT) of SN74LXC1T45 at 1.8 V supply, and why does it matter?
At VCCA = 1.8 V, the SN74LXC1T45 exhibits a minimum input hysteresis (ΔVT) of 0.3 V and typical value of 0.55 V, as specified in Section 6.5 Electrical Characteristics. This hysteresis provides noise immunity by ensuring a 300+ mV voltage window between rising and falling input thresholds, preventing multiple toggles on slow or noisy signals-critical for reliable debouncing of mechanical switches or interfacing over long, unshielded PCB traces in industrial environments.
SN74LXC1T45DBVR 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:
- SOT-23-6
SN74LXC1T45DBVR FAQ
1.How can I place an order for SN74LXC1T45DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LXC1T45DBVR 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 SN74LXC1T45DBVR reliable?
The price and inventory of SN74LXC1T45DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LXC1T45DBVR is usually 5 days.
3.What payment methods are accepted for SN74LXC1T45DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LXC1T45DBVR transactions.
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4.How is shipping managed for SN74LXC1T45DBVR?
SN74LXC1T45DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LXC1T45DBVR 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 SN74LXC1T45DBVR?
For technical support, including SN74LXC1T45DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LXC1T45DBVR requirements.
6.How does Aetrix verify that SN74LXC1T45DBVR is sourced from the original manufacturer or authorized distributors?
All SN74LXC1T45DBVR 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 SN74LXC1T45DBVR meets industry standards.
7.What is the process for return or replacement of SN74LXC1T45DBVR?
All SN74LXC1T45DBVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LXC1T45DBVR, 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 SN74LXC1T45DBVR part is unused and in its original packaging.
Return procedure for SN74LXC1T45DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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