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Texas Instruments SN74LXCH8T245RHLR
- Part No.:
- SN74LXCH8T245RHLR
- Manufacturer:
- Texas Instruments
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
SN74LXCH8T245RHLR.pdf
- Description:
- IC TRANSLATOR BIDIR 24VQFN T&R
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LXCH8T245RHLR from Texas Instruments is an 8-bit dual-supply noninverting bidirectional voltage level translator with bus-hold, supporting 1.1 V to 5.5 V on both A and B ports, up to 420 Mbps (3.3 V → 5.0 V), ±4000-V HBM ESD rating, and –40°C to +125°C operation. It enables robust I/O translation between mixed-voltage domains in industrial control backplanes and automotive body electronics.
For engineers reviewing the SN74LXCH8T245RHLR datasheet, SN74LXCH8T245RHLR pinout, SN74LXCH8T245RHLR application, or SN74LXCH8T245RHLR equivalent, this page delivers verified electrical specs, VQFN-24 package mapping, directional control logic behavior, thermal resistance (RθJA = 45.6°C/W), and real-world level-shifting use cases - all validated against TI's SCES917B production data sheet.
Technical Context
The SN74LXCH8T245RHLR implements fully configurable dual-rail translation: A-port pins and DIR/OE controls reference VCCA (1.1–5.5 V), while B-port pins reference VCCB (1.1–5.5 V). Direction is controlled by DIR (high = A→B, low = B→A), and OE enables/disables both ports simultaneously into high-impedance states.
It integrates Schmitt-trigger inputs for noise immunity, bus-hold on all data I/Os to eliminate external bias resistors, and VCC isolation: if either VCCA or VCCB drops below 100 mV, all I/Os enter high-Z. Ioff and Ioff-float support partial power-down modes without signal leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.1 V to 5.5 V each - enables translation across legacy 5 V, 3.3 V, 1.8 V, 1.2 V logic families without level-shifter staging. |
| Max Data Rate | 420 Mbps (3.3 V → 5.0 V) - supports high-speed UART, SPI, and JTAG interfaces in compact embedded systems. |
| Propagation Delay | As low as 2 ns (VCCA = 5.0 V, VCCB = 5.0 V, TA ≤ 85°C) - ensures timing-critical bidirectional communication meets setup/hold margins. |
| Bus-Hold Current | ±100 µA at 4.5 V - maintains valid logic states on floating data lines without external pull resistors, reducing BOM count. |
| Ioff Leakage | ≤ ±2.5 µA (–40°C to 125°C) - prevents current backflow during partial power-down, critical for hot-swap and battery-backed subsystems. |
| ESD Rating | ±4000 V HBM, ±1000 V CDM - meets industrial and automotive board-level ESD requirements without added protection circuitry. |
| RθJA | 45.6°C/W (VQFN-24) - enables thermal design for continuous operation at full drive strength (32 mA) in 70°C ambient environments. |
Pinout & Package
VQFN-24 package (5.50 mm × 3.50 mm, 0.5-mm pitch) with exposed thermal pad (recommended grounded).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Data I/O (Port A) | Referenced to VCCA; support 1.1–5.5 V logic levels; include bus-hold for floating-input resilience. |
| B1–B8 | Data I/O (Port B) | Referenced to VCCB; independent voltage domain; identical bus-hold and Schmitt-trigger behavior. |
| DIR | Direction Control Input | Referenced to VCCA; high = A→B, low = B→A; Schmitt-triggered for slow/noisy signals. |
| OE | Output Enable Input | Referenced to VCCA; active-low; drives all A/B pins to high-Z when high; includes static pull-down resistor. |
| VCCA | A-Port Supply | Power rail for A-side logic and DIR/OE inputs; must be ≥1.1 V for guaranteed operation. |
| VCCB | B-Port Supply | Power rail for B-side logic; electrically isolated from VCCA; supports independent sequencing. |
| GND (Pins 11, 12, 13) | Ground Reference | Three dedicated ground pins minimize ground bounce across 8-bit data paths. |
| PAD | Thermal Pad | Exposed copper pad (bottom center); improves heat dissipation; recommended soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.1–5.5 V operation on A and B ports enables direct interface between disparate logic families (e.g., 1.2 V FPGA core ↔ 5 V sensor bus). |
| VCC isolation & Ioff-float | Automatic high-Z I/O state when either VCCA or VCCB < 100 mV; eliminates signal contention during power sequencing or fault conditions. |
| Schmitt-trigger control inputs | DIR and OE tolerate slow edges and noise up to 0.65 V hysteresis (at 3 V), removing need for external filtering in noisy automotive or industrial environments. |
| Integrated bus-hold | Eliminates external pull-up/down resistors on all 16 data lines - reduces layout area, BOM cost, and signal integrity risk from stubs. |
| Low static current | 4 µA max at 25°C (ICCA + ICCB) - suitable for always-on subsystems in battery-powered telematics and IoT edge nodes. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Interfacing a 3.3 V microcontroller I/O bank to legacy 5 V analog sensor conditioning circuits on a DIN-rail mounted PLC. IC Role / Device Role / Timing Role: Bidirectional level shifter enabling SPI and GPIO communication across voltage domains while maintaining signal integrity under EMI-prone factory floor conditions. Use Value: Eliminates discrete resistor networks and external buffers; supports 420 Mbps burst transfers for fast ADC readouts; withstands ±4000 V HBM per IEC 61000-4-2. |
Use Scenario: Translating signals between a 1.8 V ADAS domain controller and 5 V lighting drivers or door-lock actuators in a vehicle BCM. IC Role / Device Role / Timing Role: Voltage translator with VCC isolation, ensuring safe hot-plug of modules and preventing back-powering during sleep mode transitions. Use Value: Ioff-float blocks leakage when VCCB is unpowered; bus-hold retains last valid state on open-drain wake-up lines; operates reliably from –40°C to +125°C. |
| Medical Patient Monitor Data Bus | Test Equipment Digital I/O Card |
|
Use Scenario: Isolating 1.2 V FPGA configuration I/O from 3.3 V display interface and 5 V serial debug port in a portable diagnostic device. IC Role / Device Role / Timing Role: Low-power, glitch-free level translator supporting multiple simultaneous voltage domains with robust power supply sequencing tolerance. Use Value: 4 µA quiescent current extends battery life; Schmitt-trigger inputs reject ECG/EEG noise; RθJA = 45.6°C/W allows fanless enclosure design. |
Use Scenario: Providing programmable 8-bit I/O expansion on a PXI-based test instrument, translating between 1.5 V pattern generator outputs and 5 V DUT stimulus inputs. IC Role / Device Role / Timing Role: High-drive (32 mA) bidirectional translator enabling TTL-compatible signal sourcing/sinking without external drivers. Use Value: Supports 200+ Mbps data rates for high-speed digital pattern generation; tpd ≤ 6.5 ns at 3.3 V → 5.0 V ensures tight timing closure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH8T245RHLR | Lower propagation delay (typ. 2.3 ns @ 3.3 V → 5 V), but no bus-hold; requires external pull resistors on floating inputs. | Lacks bus-hold - unsuitable where input lines may float during initialization or fault states. | Choose when maximum speed is prioritized over input state retention and BOM simplification. |
| TXB0108RKL | Auto-direction sensing (no DIR pin), lower drive (±24 mA), higher ICC (12 µA typ.), and no VCC isolation - outputs remain active if one rail fails. | Not suitable for systems requiring guaranteed high-Z on VCC loss or explicit direction control (e.g., shared-bus arbitration). | Prefer for simple push-pull I/O expansion where direction is software-determined and power sequencing is tightly controlled. |
Compared with SN74LXCH8T245RHLR, SN74AVCH8T245RHLR trades bus-hold and VCC isolation for faster switching, while TXB0108RKL removes DIR complexity at the cost of fault resilience and deterministic control - making SN74LXCH8T245RHLR optimal for safety-critical or mixed-rail industrial designs.
Availability
SN74LXCH8T245RHLR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, medical patient monitors, and automated test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74LXCH8T245RHLR 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 specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-reliability interface ICs.
The SN74LXCH8T245 belongs to TI's LXC logic family - engineered for ultra-low-power, mixed-voltage system interfacing in harsh environments, with emphasis on robustness, wide VCC range, and simplified board design.
FAQ
What is the maximum supported data rate for SN74LXCH8T245RHLR in 3.3 V to 5.0 V up-translation?
The SN74LXCH8T245RHLR supports up to 420 Mbps in 3.3 V to 5.0 V up-translation mode, as specified in Section 6.12 (TMAX) of the SCES917B datasheet. This performance is achievable under 50% duty cycle, 20% pulse threshold conditions at –40°C to +125°C ambient temperature, with proper PCB layout and termination.
Does SN74LXCH8T245RHLR require external pull-up or pull-down resistors on its data I/O pins?
No, SN74LXCH8T245RHLR does not require external pull-up or pull-down resistors on A1–A8 or B1–B8 pins because it integrates bus-hold circuitry on all data I/Os. This feature actively maintains the last-valid logic state when inputs float, eliminating BOM components and associated layout constraints.
How does the VCC isolation feature behave in SN74LXCH8T245RHLR during power sequencing?
In SN74LXCH8T245RHLR, if either VCCA or VCCB falls below 100 mV, all A- and B-port I/Os automatically enter a high-impedance state. This VCC isolation prevents signal contention and back-driving during asymmetric power-up/down sequences - a key requirement in modular systems with staggered rail activation.
What is the thermal resistance (RθJA) of SN74LXCH8T245RHLR in its VQFN-24 package?
The SN74LXCH8T245RHLR in the RHL (VQFN-24) package has a junction-to-ambient thermal resistance (RθJA) of 45.6°C/W, as documented in Section 6.4 of the SCES917B datasheet. This value assumes standard JEDEC 2-layer board conditions and confirms suitability for continuous 32-mA output operation in 70°C ambient environments.
Can SN74LXCH8T245RHLR operate with different supply voltages on VCCA and VCCB simultaneously?
Yes, SN74LXCH8T245RHLR is explicitly designed for dual-supply operation: VCCA and VCCB may be set independently within 1.1 V to 5.5 V each. For example, VCCA = 1.8 V (FPGA I/O) and VCCB = 5 V (legacy sensor bus) is a supported configuration, with direction and enable logic referenced solely to VCCA.
SN74LXCH8T245RHLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LXCH
- 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)
SN74LXCH8T245RHLR FAQ
1.How can I place an order for SN74LXCH8T245RHLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LXCH8T245RHLR 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 SN74LXCH8T245RHLR reliable?
The price and inventory of SN74LXCH8T245RHLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LXCH8T245RHLR is usually 5 days.
3.What payment methods are accepted for SN74LXCH8T245RHLR?
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SN74LXCH8T245RHLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LXCH8T245RHLR 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 SN74LXCH8T245RHLR?
For technical support, including SN74LXCH8T245RHLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LXCH8T245RHLR requirements.
6.How does Aetrix verify that SN74LXCH8T245RHLR is sourced from the original manufacturer or authorized distributors?
All SN74LXCH8T245RHLR 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 SN74LXCH8T245RHLR meets industry standards.
7.What is the process for return or replacement of SN74LXCH8T245RHLR?
All SN74LXCH8T245RHLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LXCH8T245RHLR, 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 SN74LXCH8T245RHLR part is unused and in its original packaging.
Return procedure for SN74LXCH8T245RHLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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