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Texas Instruments SN74LXCH1T45DCKR
- Part No.:
- SN74LXCH1T45DCKR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LXCH1T45DCKR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL SC70-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LXCH1T45 from Texas Instruments is a single-bit, dual-supply noninverting bus transceiver with configurable voltage translation (1.1 V to 5.5 V per port), 3-state outputs, bus-hold inputs, and Schmitt-trigger control logic. It enables bidirectional level shifting between mismatched I/O domains in space-constrained interfaces such as MCU-to-peripheral, FPGA-I/O expansion, or sensor hub interconnects.
For engineers reviewing the SN74LXCH1T45 datasheet, SN74LXCH1T45 pinout, SN74LXCH1T45 application, or SN74LXCH1T45 equivalent, key selection criteria include its dual-rail operating range, bus-hold elimination of external biasing, VCC isolation behavior, 420-Mbps max data rate (3.3 V → 5.0 V), and guaranteed operation from –40°C to +125°C.
Technical Context
The SN74LXCH1T45 implements a fully independent dual-supply architecture: I/O port A and DIR control are referenced to VCCA, while port B is referenced to VCCB - enabling true asynchronous voltage domain bridging. Its bus-hold circuitry actively sustains input states without external resistors, and Schmitt-triggered DIR inputs tolerate slow or noisy control signals.
VCC isolation ensures all I/Os enter high-impedance when either supply drops below 100 mV, and Ioff-float supports partial power-down with floating supplies. The device meets JESD 78 Class II latch-up immunity (>100 mA) and exceeds JESD 22 ESD ratings (±4000-V HBM, ±1000-V CDM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA/VCCB) | 1.1 V to 5.5 V each - enables direct interfacing between sub-1.2-V logic and 5-V legacy peripherals without external level-shifting components. |
| Max Data Rate | 420 Mbps (3.3 V → 5.0 V) - supports high-speed serial links like SPI clock/data lines or fast GPIO toggling in industrial controllers. |
| Bus-Hold Current | ±100 µA (at 4.5 V) - eliminates need for pull-up/pull-down resistors on data lines, reducing BOM count and PCB area in dense layouts. |
| Propagation Delay | 1 ns min / 15 ns max (VCCA = 3.3 V, VCCB = 5.0 V, –40°C to 125°C) - ensures deterministic timing for real-time control loops and synchronous communication. |
| Quiescent Current | 3 µA max at 25°C - critical for battery-powered IoT nodes where standby current directly impacts multi-year runtime. |
| ESD Protection | ±4000-V HBM, ±1000-V CDM - provides robust handling during automated assembly and field-replaceable module insertion. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
Pinout & Package
SN74LXCH1T45 is packaged in SC70-6 (DCK), SON-6 (DRY), and X2SON-6 (DTQ) variants. This entry corresponds to the DCK (SC70) package: 2.00 mm × 1.25 mm, 0.65 mm pitch, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply rail | Reference voltage for port A I/O and DIR control input - must be stable within 1.1 V–5.5 V; powers internal bus-hold and level-shift circuitry for A side. |
| VCCB | B-port supply rail | Reference voltage for port B I/O only - independent of VCCA; enables true bidirectional translation across disparate voltage domains. |
| GND | Ground reference | Common return path for both supply rails; must be low-inductance and shared with connected systems to avoid ground bounce-induced glitches. |
| A | Bidirectional data I/O (A-side) | Port A signal line with bus-hold and Schmitt-trigger input; referenced to VCCA; supports 32-mA drive strength at 5 V. |
| DIR | Direction control input | Active-high signal referenced to VCCA; high = A→B transfer, low = B→A transfer; includes integrated static pull-down for floating-input safety. |
| B | Bidirectional data I/O (B-side) | Port B signal line with bus-hold; referenced to VCCB; electrically isolated from A-side logic except through controlled transceiver path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.1 V–5.5 V operation on VCCA and VCCB enables seamless interface between ultra-low-voltage MCUs (e.g., 1.2 V ARM Cortex-M0+) and 3.3/5 V sensors or displays. |
| Integrated bus-hold | Eliminates external bias resistors on A/B data lines - reduces component count, layout complexity, and risk of floating inputs in unpowered or hot-plug scenarios. |
| VCC isolation & Ioff-float | Automatic high-Z I/O state when either VCCA or VCCB < 100 mV; allows safe partial power-down of subsystems without signal contention or back-powering. |
| Schmitt-trigger DIR input | Provides noise immunity and clean edge detection on direction control - essential for reliable operation with slow-switching microcontroller GPIO or mechanical switch debouncing. |
| Robust power sequencing | No glitch generation during asymmetric VCCA/VCCB ramp-up/down - removes need for complex power-supply supervisors or sequencing ICs in multi-rail systems. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Interfacing a 1.8-V I²C temperature sensor to a 3.3-V microcontroller in a factory-floor environmental monitor. IC Role / Device Role: Bidirectional voltage translator for SDA/SCL lines with bus-hold preventing floating states during sensor sleep mode. Use Value: Eliminates four external pull-up resistors and guarantees glitch-free arbitration during mixed-voltage I²C communication up to 400 kHz. | Use Scenario: Level-shifting LIN bus wake-up signals between a 5-V body controller MCU and 3.3-V door module transceiver. IC Role / Device Role: Unidirectional (DIR-controlled) signal translator with VCC isolation to prevent back-powering when door module is powered down. Use Value: Enables safe hot-swap of door modules while maintaining system-level wake-up integrity and meeting ISO 11898-3 EMC requirements. |
| Wearable Health Monitor | Programmable Logic I/O Expansion |
Use Scenario: Connecting a 1.2-V biopotential ADC to a 2.5-V BLE SoC in a compact ECG patch. IC Role / Device Role: Low-voltage bidirectional translator with sub-µA quiescent current and bus-hold retention during ADC conversion gaps. Use Value: Extends battery life beyond 7 days by eliminating leakage paths and enabling deep-sleep modes without external bias networks. | Use Scenario: Expanding FPGA I/O banks to drive 5-V LED indicators and 3.3-V optocouplers in an industrial PLC backplane. IC Role / Device Role: High-drive-strength (32 mA) translator with 3-state outputs for multiplexed indicator control and fault-safe isolation. Use Value: Replaces discrete MOSFET level shifters and reduces board area by >60% while supporting simultaneous 5-V and 3.3-V peripheral control from one FPGA pin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH1T45DBVR | Same pinout, identical function, but uses AVCH process - lower propagation delay (typ. 1.8 ns vs 3.5 ns at 3.3 V), higher drive (36 mA), and tighter VCC min (0.8 V). | Preferred for high-speed SPI or MIPI I3C interfaces requiring < 2 ns skew; not qualified for 125°C operation. | Select SN74AVCH1T45DBVR when speed and sub-1-V compatibility outweigh extended temperature needs. |
| TXS0101DCKR | Auto-direction sensing (no DIR pin), lower drive (8 mA), no bus-hold, supports 1.2–3.6 V only - lacks VCC isolation and Ioff-float. | Suitable for simple push-pull I²C/SMBus where direction is implicit; unsuitable for controlled bidirectional data buses or partial-power-down systems. | Choose TXS0101DCKR only for cost-sensitive, low-speed, auto-direction applications with matched supply ranges. |
Compared with SN74AVCH1T45DBVR and TXS0101DCKR, the SN74LXCH1T45 uniquely balances wide voltage range (1.1–5.5 V), full thermal qualification (–40°C to 125°C), VCC isolation, and bus-hold - making it the only option for ruggedized, mixed-voltage, and thermally demanding embedded designs.
Availability
SN74LXCH1T45 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, wearable health monitors, and programmable logic I/O expansion requiring stable component supply across extended temperature and voltage ranges.
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 for industrial, automotive, personal electronics, and enterprise systems.
The SN74LXCH1T45 belongs to TI's LXC logic family - engineered for ultra-low-power, robust voltage translation in space-constrained, thermally aggressive environments where reliability and supply flexibility are critical.
FAQ
What is the minimum supply voltage required for reliable operation of the SN74LXCH1T45?
The SN74LXCH1T45 supports VCCA and VCCB down to 1.1 V - verified across the full –40°C to +125°C temperature range. Below 1.1 V, bus-hold functionality degrades and propagation delay increases significantly; operation at 1.0 V is not characterized or guaranteed. Always maintain supply voltages ≥1.1 V for compliant behavior per the SCES939 datasheet.
Does the SN74LXCH1T45 require external pull-up or pull-down resistors on its A and B ports?
No. The SN74LXCH1T45 integrates bus-hold circuitry on both A and B data I/Os, which actively maintains the last-valid logic state without external biasing. This eliminates the need for pull-up or pull-down resistors in most applications - reducing BOM cost, PCB area, and potential signal integrity issues caused by resistor parasitics.
How does the SN74LXCH1T45 behave when one supply rail is powered off?
When either VCCA or VCCB falls below 100 mV, all I/Os (A, B) automatically enter a high-impedance state - a feature called VCC isolation. Additionally, the Ioff-float specification ensures that leakage current remains ≤2.5 µA even if the inactive supply floats, preventing back-powering of disconnected subsystems and enabling safe partial power-down operation.
Can the SN74LXCH1T45 translate signals between 1.2 V and 5 V domains reliably?
Yes. The SN74LXCH1T45 is explicitly characterized for 1.2 V ↔ 5.0 V translation, supporting up to 420 Mbps in the 3.3 V → 5.0 V direction and 200 Mbps in the 1.2 V → 5.0 V direction. Its dual-rail architecture, bus-hold, and Schmitt-trigger DIR input ensure robust signal integrity across this full range without external components.
Is the SN74LXCH1T45 compatible with standard SC70-6 PCB footprints?
Yes. The SN74LXCH1T45 in DCK (SC70-6) package uses the industry-standard SC70 footprint: 2.00 mm × 1.25 mm body, 0.65 mm lead pitch, and gull-wing leads. It is mechanically and solder-reflow compatible with other SC70-6 devices, including TI's SN74LVC1T45 and SN74AVC1T45, enabling drop-in replacement in existing layouts.
SN74LXCH1T45DCKR 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-TSSOP, SC-88, SOT-363
SN74LXCH1T45DCKR FAQ
1.How can I place an order for SN74LXCH1T45DCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LXCH1T45DCKR 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 SN74LXCH1T45DCKR reliable?
The price and inventory of SN74LXCH1T45DCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LXCH1T45DCKR is usually 5 days.
3.What payment methods are accepted for SN74LXCH1T45DCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LXCH1T45DCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LXCH1T45DCKR?
SN74LXCH1T45DCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LXCH1T45DCKR 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 SN74LXCH1T45DCKR?
For technical support, including SN74LXCH1T45DCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LXCH1T45DCKR requirements.
6.How does Aetrix verify that SN74LXCH1T45DCKR is sourced from the original manufacturer or authorized distributors?
All SN74LXCH1T45DCKR 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 SN74LXCH1T45DCKR meets industry standards.
7.What is the process for return or replacement of SN74LXCH1T45DCKR?
All SN74LXCH1T45DCKR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LXCH1T45DCKR, 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 SN74LXCH1T45DCKR part is unused and in its original packaging.
Return procedure for SN74LXCH1T45DCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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