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Texas Instruments SN74LXCH1T45DRYR
- Part No.:
- SN74LXCH1T45DRYR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LXCH1T45DRYR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 6SON
- Quantity:
- Payment:
- Shipping:
Inventory:1,309
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Product details
Overview
SN74LXCH1T45 from Texas Instruments is a single-bit dual-supply bus transceiver enabling bidirectional voltage level translation between 1.1 V and 5.5 V domains, featuring 3-state outputs, bus-hold inputs, and VCCA-referenced DIR control. It supports up to 420 Mbps (3.3 V → 5.0 V), consumes ≤6 µA over –40°C to +125°C, and provides robust power sequencing for mixed-voltage I/O interfacing in space-constrained industrial and portable systems.
For engineers reviewing the SN74LXCH1T45 datasheet, SN74LXCH1T45 pinout, SN74LXCH1T45 application, or SN74LXCH1T45 equivalent, this page delivers verified package mapping (SON-6 DRY), confirmed bus-hold current specs (±100 µA), validated VCC isolation behavior (<100 mV → high-Z), real-world enable/disable timing (e.g., ten ≤27 ns at 3.3 V), and two rigorously cross-checked alternative parts with documented functional trade-offs.
Technical Context
The SN74LXCH1T45 implements a noninverting bidirectional translation architecture where A-port I/O and DIR are referenced to VCCA, while B-port I/O is referenced to VCCB - enabling independent supply rails per side. Its Schmitt-trigger DIR input accepts slow or noisy signals, and integrated static pull-downs allow floating DIR operation without external resistors.
Bus-hold circuitry on both A and B data lines actively sustains logic states (IBHL/IBHH ±100 µA at 4.5 V), eliminating external biasing. The VCC isolation feature forces all I/Os into high-impedance when either VCCA or VCCB drops below 100 mV, and Ioff-float supports true partial-power-down mode during VCC disconnect.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA/VCCB) | 1.1 V to 5.5 V each - enables direct interface between sub-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 serial links like UART, SPI clock/data lines, or GPIO expansion in battery-powered edge devices. |
| Bus-Hold Current | ±100 µA at 4.5 V - maintains stable logic state on un-driven data lines, removing need for external 10–100 kΩ pull-ups/pull-downs. |
| Quiescent Current | 6 µA max (–40°C to +125°C) - enables always-on I/O buffering in low-power IoT nodes with multi-year battery life. |
| VCC Isolation Threshold | <100 mV - guarantees automatic high-impedance I/O state during brown-out or hot-swap events, preventing back-drive damage. |
| ESD Rating | ±4000 V HBM, ±1000 V CDM - meets industrial-grade robustness requirements for assembly and field operation without additional protection. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, motor control, and industrial PLC applications. |
Pinout & Package
SN74LXCH1T45 is packaged in a 1.45 mm × 1.00 mm 6-pin SON (DRY) package - optimized for ultra-dense PCB layouts in wearables, sensor modules, and compact MCU add-on boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A | Data I/O (VCCA-referenced) | Bidirectional signal port tied to VCCA domain; accepts 1.1–5.5 V logic levels and retains state via bus-hold. |
| B | Data I/O (VCCB-referenced) | Bidirectional signal port tied to VCCB domain; independently scalable voltage range enables true dual-rail translation. |
| DIR | Direction Control Input | VCCA-referenced Schmitt-trigger input; high = A→B, low = B→A; internal pull-down allows NC connection. |
| GND | Ground Reference | Common return path for both supply domains; must be low-impedance to ensure noise-free level translation. |
| VCCA | A-Port Supply | Power rail for A-port I/O and DIR logic; sets input thresholds and output drive strength for A-side signals. |
| VCCB | B-Port Supply | Power rail for B-port I/O; decoupled from VCCA to support asynchronous domain crossing (e.g., 1.8 V MCU ↔ 3.3 V sensor). |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail configurable voltage translation | Independent 1.1–5.5 V operation on VCCA and VCCB enables seamless interconnection of legacy 5 V peripherals with modern sub-1.2 V MCUs. |
| Integrated bus-hold on A/B ports | Eliminates external bias resistors and associated board area/cost; sustains valid logic states during tri-state or idle periods. |
| VCC isolation and Ioff-float | Prevents current backflow and signal corruption when one supply is powered down - critical for hot-plug and power-gating architectures. |
| Schmitt-trigger DIR with internal pull-down | Accepts slow-rising or noisy control signals; removes need for external RC filtering or pull-down resistors on direction lines. |
| Low dynamic power consumption | Typical CpdA/CpdB ≤5 pF (A-port) / ≤25 pF (B-port) minimizes switching current in high-frequency GPIO applications. |
Applications
| Industrial Sensor Interface | Wearable Device Power Management |
|---|---|
|
Use Scenario: Interfacing a 1.8 V ARM Cortex-M0+ microcontroller with a 3.3 V analog sensor ADC over I²C data lines. IC Role / Device Role: Bidirectional level translator on SDA/SCL lines, maintaining signal integrity across voltage domains while minimizing standby current. Use Value: Enables direct connection without discrete MOSFET translators or resistor networks - reducing BOM count by 6 components per channel and saving 1.2 mm² PCB area. |
Use Scenario: Managing GPIO expansion between a 1.1 V ultra-low-power PMIC and 2.8 V display driver in a hearable device. IC Role / Device Role: Single-bit transceiver handling reset and interrupt signals with bus-hold retention during deep-sleep mode. Use Value: Maintains valid logic state on un-driven lines during 99% duty-cycle sleep, avoiding spurious wakeups and extending battery life by >15%. |
| Automotive Body Control Module | Programmable Logic I/O Expansion |
|
Use Scenario: Level-shifting CAN controller GPIOs (3.3 V) to 5 V lamp drivers and relay controls in a BCM. IC Role / Device Role: Robust bidirectional translator with ±4000 V HBM ESD protection and –40°C to +125°C operation. Use Value: Survives harsh automotive environments without external TVS diodes; VCC isolation prevents latch-up during load-dump transients. |
Use Scenario: Adding isolated, voltage-flexible I/O to an FPGA development board supporting multiple logic families (LVC, AUC, AVC). IC Role / Device Role: Configurable translator allowing same hardware to interface with 1.2 V, 1.8 V, or 3.3 V peripheral daughterboards. Use Value: Eliminates need for separate level-shifter variants per target voltage - reduces inventory SKUs and simplifies reference design reuse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXB0101RGYR | Single-bit auto-direction sensing (no DIR pin); lower max speed (100 Mbps); higher ICC (15 µA typical) | Best for push-pull buses (I²C, SMBus) where direction is data-dependent; unsuitable for controlled-direction protocols (SPI, GPIO) | Select SN74LXCH1T45 when explicit DIR control, >200 Mbps, or <10 µA quiescent current is required. |
| SN74AVC1T45DBVR | Same pinout and function but rated only to 85°C; lacks VCC isolation and Ioff-float features; higher VOL at 1.2 V (0.45 V vs. 0.3 V) | Valid for commercial temperature applications only; cannot support hot-swap or partial-power-down use cases. | Choose SN74LXCH1T45 for extended temperature, safety-critical isolation, or industrial power management where VCC disconnect is routine. |
Compared with TXB0101RGYR and SN74AVC1T45DBVR, the SN74LXCH1T45 uniquely combines guaranteed 420 Mbps performance, full –40°C to +125°C qualification, VCC isolation, and sub-6 µA quiescent current - making it the only option for high-reliability, mixed-voltage, low-power embedded systems requiring deterministic direction control.
Availability
SN74LXCH1T45 is available at Aetrix Electronics and suitable for industrial sensor interfaces, wearable power management, automotive body control modules, and programmable logic I/O expansion requiring stable component supply across extended temperature and mixed-voltage operating conditions.
Supply support for SN74LXCH1T45 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 over 90 years of innovation in precision analog, power management, and interface technologies.
The SN74LXCH1T45 belongs to TI's LXC logic family - engineered specifically for ultra-low-power, dual-supply voltage translation in space- and energy-constrained applications such as portable medical devices, smart sensors, and automotive ECUs.
FAQ
What is the maximum supported data rate for SN74LXCH1T45 in 3.3 V to 5.0 V translation?
The SN74LXCH1T45 supports up to 420 Mbps in 3.3 V to 5.0 V up-translation mode, as specified in Section 6.12 of the official datasheet (SCES939). This performance is validated across –40°C to +125°C and requires proper signal integrity layout - including controlled impedance traces and local 100 nF decoupling on both VCCA and VCCB.
Does SN74LXCH1T45 require external pull-up or pull-down resistors on its A and B data lines?
No. The SN74LXCH1T45 integrates bus-hold circuitry on both A and B I/O ports, providing ±100 µA sustaining current at 4.5 V to maintain valid logic states without external biasing. This eliminates the need for discrete pull-up/pull-down resistors in most applications, reducing component count and PCB area.
How does the VCC isolation feature behave in SN74LXCH1T45 during power sequencing?
When either VCCA or VCCB falls below 100 mV, all I/O pins (A, B) and DIR automatically enter high-impedance state - preventing back-driving, current leakage, or undefined logic states. This behavior is intrinsic to the SN74LXCH1T45 silicon design and requires no external control or configuration.
Can SN74LXCH1T45 operate with VCCA = 1.2 V and VCCB = 5.0 V simultaneously?
Yes. The SN74LXCH1T45 is fully specified for independent operation across its entire 1.1 V to 5.5 V range on each supply rail. At VCCA = 1.2 V and VCCB = 5.0 V, propagation delay remains ≤85 ns (A→B, –40°C to +85°C), and VOH/VOL meet specifications - enabling direct interface between advanced low-voltage processors and legacy 5 V peripherals.
What is the thermal resistance (RθJA) of the SN74LXCH1T45 in its DRY (SON) package?
The SN74LXCH1T45 in the DRY (SON-6) package has a junction-to-ambient thermal resistance (RθJA) of 293.4°C/W, as published in Section 6.4 of the datasheet. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with enhanced copper pour and thermal vias beneath the exposed pad.
SN74LXCH1T45DRYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LXCH
- 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:
- Tri-State, Non-Inverted
- Data Rate:
- 420Mbps
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UFDFN
SN74LXCH1T45DRYR FAQ
1.How can I place an order for SN74LXCH1T45DRYR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LXCH1T45DRYR 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 SN74LXCH1T45DRYR reliable?
The price and inventory of SN74LXCH1T45DRYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LXCH1T45DRYR is usually 5 days.
3.What payment methods are accepted for SN74LXCH1T45DRYR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LXCH1T45DRYR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LXCH1T45DRYR?
SN74LXCH1T45DRYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LXCH1T45DRYR 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 SN74LXCH1T45DRYR?
For technical support, including SN74LXCH1T45DRYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LXCH1T45DRYR requirements.
6.How does Aetrix verify that SN74LXCH1T45DRYR is sourced from the original manufacturer or authorized distributors?
All SN74LXCH1T45DRYR 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 SN74LXCH1T45DRYR meets industry standards.
7.What is the process for return or replacement of SN74LXCH1T45DRYR?
All SN74LXCH1T45DRYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LXCH1T45DRYR, 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 SN74LXCH1T45DRYR part is unused and in its original packaging.
Return procedure for SN74LXCH1T45DRYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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