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Texas Instruments SN74LXC8T245RHLR
- Part No.:
- SN74LXC8T245RHLR
- Manufacturer:
- Texas Instruments
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
SN74LXC8T245RHLR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:629
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Product details
Overview
SN74LXC8T245RHLR from Texas Instruments is an 8-bit dual-supply noninverting bidirectional bus transceiver with configurable level shifting, 3-state outputs, VCCA/VCCB supply range of 1.1 V to 5.5 V, ±4000-V HBM ESD rating, and –40°C to +125°C operating temperature. It enables voltage translation between disparate logic domains in mixed-voltage systems such as FPGA-to-microcontroller I/O bridging.
For engineers reviewing the SN74LXC8T245RHLR datasheet, SN74LXC8T245RHLR pinout, SN74LXC8T245RHLR application, or SN74LXC8T245RHLR equivalent, key selection criteria include dual-rail voltage flexibility (1.1–5.5 V per port), Schmitt-trigger input noise immunity, Ioff-float partial-power-down behavior, and 420-Mbps up-translation capability (3.3 V → 5.0 V).
Technical Context
This device implements a fully configurable dual-rail architecture where A-port I/Os and control inputs (DIR, OE) reference VCCA, while B-port I/Os reference VCCB-enabling independent voltage domain operation. Directional data flow (A↔B) is controlled by DIR, and output enable/disable is managed via OE, both referenced to VCCA.
It integrates dynamic pull-down resistors on all I/Os and static pull-downs on DIR/OE, eliminating external biasing components. The VCC isolation feature forces all I/Os into high-impedance when either VCCA or VCCB falls below 100 mV, supporting robust power sequencing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA / VCCB) | 1.1 V to 5.5 V each - supports heterogeneous logic families (1.2 V, 1.8 V, 2.5 V, 3.3 V, 5 V) without level-shifter ICs |
| Max Data Rate | 420 Mbps (3.3 V → 5.0 V up-translation) - enables high-speed UART, SPI, and JTAG interface bridging |
| ESD Rating | ±4000 V HBM - meets industrial-grade robustness requirements for board-level handling and system integration |
| Propagation Delay (tpd) | 2 ns (min) to 10 ns (max) at 3.3 V/5.0 V - ensures timing-critical signal integrity in real-time control paths |
| Ioff-float Current | ≤2.5 µA (–40°C to 125°C) - guarantees low leakage during partial power-down, critical for battery-backed subsystems |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and outdoor embedded applications |
| Output Drive Strength | Up to 32 mA at 5 V - directly drives LEDs, buffers, or legacy TTL loads without external drivers |
Pinout & Package
VQFN-24 package (RHL), 5.50 mm × 3.50 mm body size, 0.5-mm pitch, exposed thermal pad (recommended grounded).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply | Reference for A-side I/Os and DIR/OE control logic; must be stable within 1.1–5.5 V |
| VCCB | B-port supply | Reference for B-side I/Os only; independent of VCCA, enabling true bidirectional level translation |
| DIR | Direction control | High = A→B data flow; Low = B→A; referenced to VCCA, not VCCB |
| OE | Output enable | Low = outputs active; High = all A/B pins tri-stated; referenced to VCCA |
| A1–A8 | A-port I/Os | Bidirectional data lines referenced to VCCA; include Schmitt-trigger inputs and dynamic pull-downs |
| B1–B8 | B-port I/Os | Bidirectional data lines referenced to VCCB; same Schmitt-trigger and pull-down features as A-port |
| GND (×3) | Ground | Three dedicated ground pins minimize ground bounce and improve noise immunity across wide bandwidth |
| PAD | Thermal pad | Exposed copper pad for thermal dissipation; recommended to connect to PCB ground plane for optimal junction temp |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply level shifting | Independent 1.1–5.5 V operation on A and B ports enables seamless interfacing between sub-1.2 V logic and 5 V peripherals |
| Schmitt-trigger inputs | Hysteresis ≥0.2 V (up to 1.06 V) rejects slow edges and noise on mechanical switch or long-trace signals |
| Ioff-float isolation | Automatically places all I/Os in high-Z when either VCCA or VCCB drops below 100 mV - prevents backfeeding and ensures safe power sequencing |
| Integrated pull-downs | Static pull-downs on DIR/OE eliminate floating-control risk; dynamic pull-downs on I/Os reduce external RC debouncing components |
| Low quiescent current | 4 µA max at 25°C (ICCA + ICCB) - extends battery life in always-on sensor nodes and IoT edge devices |
Applications
| FPGA-to-MCU Interface Bridging | Industrial Sensor Hub Aggregation |
|---|---|
Use Scenario: Connecting a 1.2-V FPGA I/O bank to a 3.3-V microcontroller GPIO header in a programmable logic controller. IC Role / Device Role / Timing Role: Bidirectional level translator managing data flow direction via DIR and enabling/disabling via OE during configuration handshaking. Use Value: Eliminates need for discrete MOSFET translators or multiple single-channel ICs - reduces BOM count and layout area by >70%. |
Use Scenario: Aggregating analog sensor outputs (via ADCs) and digital status signals (limit switches, encoders) onto a single 3.3-V RS-485 bus controller. IC Role / Device Role / Timing Role: Voltage translator isolating 5-V sensor supply domains from 3.3-V communication logic while maintaining signal integrity. Use Value: Schmitt-trigger inputs suppress contact bounce and EMI on long sensor cables; Ioff-float prevents backfeed during sensor hot-swap events. |
| Automotive Body Control Module | USB-C Power Delivery Negotiation |
Use Scenario: Interfacing a 5-V LIN transceiver and 1.8-V CAN FD controller inside an automotive door module with shared MCU. IC Role / Device Role / Timing Role: Level-shifting transceiver enabling bidirectional command/status exchange between legacy and next-gen protocols. Use Value: Supports –40°C to +125°C operation and ±4000-V HBM - meets AEC-Q100 Grade 1 reliability for under-dash environments. |
Use Scenario: Translating CC1/CC2 configuration channel signals between a 5-V USB-C PD controller and a 1.1-V embedded security co-processor. IC Role / Device Role / Timing Role: Low-voltage-capable bidirectional translator ensuring accurate PD negotiation timing (<10 ns propagation delay). Use Value: 1.1-V minimum VCCA support enables direct connection to ultra-low-power secure elements without intermediate regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXB0108PWR | 8-bit auto-direction sensing (no DIR pin); lower max drive (24 mA); no Ioff-float; 1.2–3.6 V VCCA/VCCB range | Lacks explicit direction control - unsuitable for synchronous bidirectional protocols like SPI full-duplex or JTAG TDI/TDO | Select SN74LXC8T245RHLR when DIR-controlled deterministic data flow or <1.2 V operation is required. |
| SN74AVC8T245RHLR | Same pinout and function but lacks Schmitt-trigger inputs, Ioff-float, and 1.1-V support; higher ICC (24 µA typical) | Not suitable for noisy industrial environments or partial-power-down systems requiring leakage <5 µA | Choose SN74LXC8T245RHLR for enhanced noise immunity, wider voltage range, and lower standby power. |
Compared with TXB0108PWR and SN74AVC8T245RHLR, SN74LXC8T245RHLR uniquely combines 1.1-V operation, Schmitt-trigger noise rejection, and Ioff-float isolation - making it the only option qualified for ultra-low-voltage, high-noise, and multi-rail power-gated designs.
Availability
SN74LXC8T245RHLR is available at Aetrix Electronics and suitable for FPGA interconnect, industrial sensor aggregation, automotive body control, and USB-C PD negotiation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74LXC8T245RHLR 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 with over 90 years of innovation in power management, signal chain, and microcontrollers.
The SN74LXC8T245 belongs to TI's LXC logic family - designed specifically for low-voltage, high-noise-margin, multi-rail system interfacing in industrial automation, automotive electronics, and portable instrumentation.
FAQ
What is the minimum operating voltage for SN74LXC8T245RHLR on each supply rail?
The SN74LXC8T245RHLR supports VCCA and VCCB down to 1.1 V independently. This allows direct interfacing with sub-1.2 V logic families such as advanced ultra-low-power MCUs and AI accelerators. Operation below 1.1 V is not guaranteed and may result in undefined logic states or increased propagation delay.
Does SN74LXC8T245RHLR require external pull-up or pull-down resistors on DIR and OE?
No. SN74LXC8T245RHLR integrates static pull-down resistors on DIR and OE pins, allowing these control inputs to be left unconnected (floating) without risking metastability or unintended state transitions. External resistors are unnecessary unless specific timing or noise margin requirements dictate stronger biasing.
How does the Ioff-float feature behave when VCCA is powered but VCCB is disconnected?
When VCCB is disconnected (or falls below 100 mV), the SN74LXC8T245RHLR pulls all B-port I/Os (B1–B8) to GND via internal dynamic pull-downs, then transitions them to high-impedance. A-port I/Os remain functional if VCCA is valid - enabling safe isolation of the B-side domain without affecting A-side operation.
Can SN74LXC8T245RHLR translate between 1.1 V and 5.5 V in a single direction?
Yes. The SN74LXC8T245RHLR supports up-translation (e.g., 1.1 V A-port → 5.5 V B-port) and down-translation (5.5 V A-port → 1.1 V B-port) simultaneously. However, maximum data rate degrades at extreme ratios: 40 Mbps for 1.1 V ↔ 5.5 V, versus 420 Mbps for 3.3 V ↔ 5.0 V.
What thermal performance can be expected from SN74LXC8T245RHLR in a 4-layer PCB with 1-in² copper pour under the thermal pad?
With a 1-in² internal/external copper pour connected to the RHL package's thermal pad, SN74LXC8T245RHLR achieves ~25.1°C/W junction-to-board thermal resistance (RθJB). At 32-mA output load and 125°C ambient, junction temperature remains ≤115°C - well within the 150°C absolute maximum rating.
SN74LXC8T245RHLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LXC
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 32mA
- Voltage - Supply:
- 1.08V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VQFN (5.5x3.5)
SN74LXC8T245RHLR FAQ
1.How can I place an order for SN74LXC8T245RHLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LXC8T245RHLR 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 SN74LXC8T245RHLR reliable?
The price and inventory of SN74LXC8T245RHLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LXC8T245RHLR is usually 5 days.
3.What payment methods are accepted for SN74LXC8T245RHLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LXC8T245RHLR transactions.
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4.How is shipping managed for SN74LXC8T245RHLR?
SN74LXC8T245RHLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LXC8T245RHLR 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 SN74LXC8T245RHLR?
For technical support, including SN74LXC8T245RHLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LXC8T245RHLR requirements.
6.How does Aetrix verify that SN74LXC8T245RHLR is sourced from the original manufacturer or authorized distributors?
All SN74LXC8T245RHLR 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 SN74LXC8T245RHLR meets industry standards.
7.What is the process for return or replacement of SN74LXC8T245RHLR?
All SN74LXC8T245RHLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LXC8T245RHLR, 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 SN74LXC8T245RHLR part is unused and in its original packaging.
Return procedure for SN74LXC8T245RHLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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