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Texas Instruments SN74LVC8T245RHLR
- Part No.:
- SN74LVC8T245RHLR
- Manufacturer:
- Texas Instruments
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
SN74LVC8T245RHLR.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVC8T245 from Texas Instruments is an 8-bit dual-supply non-inverting bus transceiver enabling bidirectional voltage-level translation between 1.65V and 5.5V domains. It features independent VCCA and VCCB rails, 3-state outputs controlled by DIR and OE pins referenced to VCCA, and Ioff support for partial-power-down operation. It is used in mixed-voltage system interconnects such as 1.8V microcontrollers interfacing with 5V peripherals in industrial PLCs and flat-panel monitors.
For engineers reviewing the SN74LVC8T245 datasheet, SN74LVC8T245 pinout, SN74LVC8T245 application, or SN74LVC8T245 equivalent, key selection criteria include configurable dual-rail operation (1.65V–5.5V per port), glitch-free power sequencing, VCC isolation behavior, Ioff leakage specification (<±2 µA), and thermal performance in the RHL VQFN package (RθJA = 48.3°C/W).
Technical Context
The SN74LVC8T245 implements asynchronous bidirectional data flow via DIR-controlled directionality and OE-gated 3-state output enable. Its input circuitry remains active regardless of OE state, requiring all A/B I/Os to be held at valid logic levels to prevent excess ICCZ. Control inputs (DIR, OE) are referenced solely to VCCA, decoupling control logic from B-port voltage domain.
VCC isolation ensures high-impedance outputs when either VCCA or VCCB falls below 100 mV or floats; this is enforced by internal circuitry that disables outputs without requiring external pull resistors on OE. The device supports simultaneous translation across 1.8V/2.5V/3.3V/5V nodes with propagation delays as low as 0.3 ns (tPHZ, VCCA=5V, VCCB=1.8V) and drive strength up to ±32 mA at 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - enables universal level translation between 1.8V, 2.5V, 3.3V, and 5V logic domains without external biasing. |
| Max Output Drive | ±32 mA at 5V - supports driving moderate capacitive loads (e.g., 15 pF) while maintaining fast edge rates in high-speed digital interfaces. |
| Ioff Leakage | <±2 µA - prevents backflow current during partial power-down, protecting powered-down subsystems from unintended current paths. |
| Propagation Delay | 0.3–23.8 ns (tPHZ/tPLH) - varies with supply voltages; lowest delay occurs at VCCA=5V/VCCB=1.8V for high-speed up-translation scenarios. |
| ESD Rating | ±4000V HBM, ±1000V CDM - meets industrial-grade robustness requirements for handling and board-level reliability. |
| Operating Temp | –40°C to +85°C - qualified for extended industrial temperature operation in embedded controllers and telecom infrastructure. |
| Supply Sequencing | Glitch-free - allows arbitrary power-up/power-down order of VCCA and VCCB without spurious output transitions. |
Pinout & Package
The SN74LVC8T245RHLR is housed in a 24-pin VQFN package (RHL) measuring 5.5 mm × 3.5 mm with an exposed thermal pad. This compact, leadless package provides enhanced thermal performance (RθJA = 48.3°C/W) and improved high-frequency signal integrity over SSOP/TSSOP alternatives.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply rail | Powers A-side I/Os and references DIR/OE logic thresholds; must be stable before enabling control signals. |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A; referenced to VCCA, not VCCB. |
| OE (Pin 22) | Output-enable input | Low = outputs active; High = both A and B ports enter high-impedance state; referenced to VCCA. |
| A1–A8 (Pins 3–10) | A-port I/Os | Bidirectional data lines referenced to VCCA; require valid logic levels at all times to avoid excess ICCZ. |
| GND (Pins 11,12,13) | Ground reference | Three dedicated ground pins minimize ground bounce and improve noise immunity in high-speed switching. |
| B1–B8 (Pins 14–21) | B-port I/Os | Bidirectional data lines referenced to VCCB; electrically isolated from A-port except through transceiver logic. |
| VCCB (Pins 23,24) | B-port supply rail | Dual VCCB pins reduce IR drop and improve current delivery to B-side outputs under heavy load. |
| Thermal Pad | Thermal & electrical ground | Exposed pad must be soldered to PCB ground plane to achieve rated RθJA = 48.3°C/W and ensure long-term reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.65V–5.5V operation on A and B ports enables interoperability across 1.8V/2.5V/3.3V/5V systems without level-shifter ICs or discrete solutions. |
| VCC isolation | Automatic high-impedance output disable when either VCCA or VCCB drops below 100 mV - eliminates need for external power-good monitoring in hot-swap applications. |
| Ioff partial-power-down | Leakage limited to ±2 µA per pin during power-down - prevents back-current into unpowered sections of mixed-voltage boards. |
| Glitch-free sequencing | No output glitches during arbitrary VCCA/VCCB ramp sequences - avoids false resets or misreads in safety-critical industrial communication links. |
| Robust ESD protection | 4000V HBM and 1000V CDM ratings - exceeds JEDEC standards for manufacturing and field reliability in factory automation environments. |
Applications
| Industrial PLC Interface | Flat-Panel Monitor Control |
|---|---|
Use Scenario: Interfacing a 3.3V ARM-based controller with legacy 5V I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing command/response traffic between CPU and field I/O cards. Use Value: Eliminates need for separate unidirectional level shifters and reduces BOM count while supporting hot-plug capability via VCC isolation. | Use Scenario: Connecting a 1.8V video processor to 5V timing controller and display driver ICs in sound bar and monitor designs. IC Role / Device Role / Timing Role: Synchronous data bridge translating pixel clock, DE, HSYNC, and VSYNC signals across voltage domains. Use Value: Maintains signal integrity with <24 ns max propagation delay and ±32 mA drive strength, enabling reliable 720p/1080p timing signal routing. |
| Data Center Switch Backplane | CNC Machine Controller |
Use Scenario: Enabling communication between 2.5V FPGA management logic and 3.3V PHY interface chips on high-density switch line cards. IC Role / Device Role / Timing Role: Configurable bus transceiver supporting JTAG, I²C, and GPIO expansion across voltage-isolated subsystems. Use Value: Ioff and VCC disconnect features prevent cross-talk and latch-up during firmware updates or partial reconfiguration events. | Use Scenario: Linking a 5V motion control ASIC to 3.3V encoder feedback and sensor acquisition circuits in CNC machine tool controllers. IC Role / Device Role / Timing Role: Real-time bidirectional data conduit for position commands and status reporting with deterministic latency. Use Value: Glitch-free power sequencing ensures no spurious step pulses during power cycling, preventing mechanical positioning errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245RHLR | Lower VCC range (1.2V–3.6V); higher speed (tPLH down to 0.2 ns); no VCC isolation below 100 mV. | Better suited for ultra-low-voltage mobile SoC interconnects; unsuitable for 5V domain translation or hot-swap isolation. | Select when operating exclusively below 3.6V and requiring sub-nanosecond timing margins. |
| TXB0108RHLR | Auto-direction sensing (no DIR pin); supports 1.2V–3.6V translation; higher Ioff (±5 µA); no VCC disconnect feature. | Eliminates direction-control logic overhead but lacks deterministic bidirectional control and fails-safe isolation behavior. | Choose for simple push-pull GPIO expansion where direction is predictable and power sequencing is tightly controlled. |
Compared with SN74AVC8T245RHLR and TXB0108RHLR, the SN74LVC8T245RHLR uniquely supports full 1.65V–5.5V dual-rail operation with guaranteed VCC isolation and glitch-free sequencing - making it the only option among the three qualified for mixed 5V/3.3V industrial backplanes requiring fail-safe power-down behavior.
Availability
SN74LVC8T245RHLR is available at Aetrix Electronics and suitable for industrial PLCs, flat-panel monitor control systems, and data center switch backplanes requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for SN74LVC8T245RHLR 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 deep expertise in interface, power management, and signal chain technologies.
The SN74LVC8T245 belongs to TI's LVC logic family, designed specifically for robust, low-voltage bidirectional bus translation in industrial, computing, and consumer electronics where mixed-voltage interoperability and power sequencing resilience are critical.
FAQ
What voltage ranges can the SN74LVC8T245RHLR translate between?
The SN74LVC8T245RHLR supports bidirectional voltage translation between any two logic domains where VCCA and VCCB are independently set from 1.65V to 5.5V - including 1.8V ↔ 2.5V, 1.8V ↔ 3.3V, 1.8V ↔ 5V, 3.3V ↔ 5V, and all other combinations within that range. It does not support translation below 1.65V; for sub-1.65V applications, TI recommends the AXC family.
How does the VCC isolation feature work on the SN74LVC8T245RHLR?
The SN74LVC8T245RHLR enters high-impedance output state automatically when either VCCA or VCCB falls below 100 mV or is left floating, regardless of DIR or OE states. This behavior is implemented internally and requires no external circuitry. Both A and B ports become high-impedance simultaneously, preventing bus contention during power-up/down or fault conditions.
Can the SN74LVC8T245RHLR operate with different supply voltages on VCCA and VCCB?
Yes - the SN74LVC8T245RHLR is explicitly designed for asymmetric dual-supply operation. VCCA may be 1.8V while VCCB is 5V, or vice versa, enabling up-translation (e.g., 1.8V → 5V) and down-translation (e.g., 5V → 1.8V). Control inputs DIR and OE are always referenced to VCCA, so their logic thresholds scale with the A-port supply.
What is the maximum data rate supported by the SN74LVC8T245RHLR?
The SN74LVC8T245RHLR does not specify a fixed maximum data rate; instead, its usable frequency depends on propagation delay and load capacitance. With CL = 15 pF and VCCA = VCCB = 3.3V, tPLH/tPHL is ≤6.3 ns, supporting clean signal edges up to ~80 MHz for short traces. For higher speeds, layout optimization and lower capacitive loads are required - the device is not intended for >100 MHz serial protocols.
Does the SN74LVC8T245RHLR require external pull-up or pull-down resistors on unused pins?
Yes - all unused A- and B-port I/Os must be held at valid logic HIGH or LOW (preferably tied to VCCA, VCCB, or GND) to prevent excess ICCZ and ensure stable operation. DIR and OE should also be actively driven or pulled to VCCA/GND; leaving OE floating risks unintended 3-state activation. TI's application note SCBA004 details best practices for managing floating CMOS inputs.
SN74LVC8T245RHLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- 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:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VQFN (5.5x3.5)
SN74LVC8T245RHLR FAQ
1.How can I place an order for SN74LVC8T245RHLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245RHLR 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 SN74LVC8T245RHLR reliable?
The price and inventory of SN74LVC8T245RHLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC8T245RHLR is usually 5 days.
3.What payment methods are accepted for SN74LVC8T245RHLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC8T245RHLR transactions.
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4.How is shipping managed for SN74LVC8T245RHLR?
SN74LVC8T245RHLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC8T245RHLR 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 SN74LVC8T245RHLR?
For technical support, including SN74LVC8T245RHLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245RHLR requirements.
6.How does Aetrix verify that SN74LVC8T245RHLR is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245RHLR 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 SN74LVC8T245RHLR meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245RHLR?
All SN74LVC8T245RHLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245RHLR, 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 SN74LVC8T245RHLR part is unused and in its original packaging.
Return procedure for SN74LVC8T245RHLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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