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Texas Instruments SN74LVC8T245PWG4
- Part No.:
- SN74LVC8T245PWG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC8T245PWG4.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24TSSOP
- 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 interconnects such as 1.8V controller-to-5V peripheral interfaces in flat-panel monitors and industrial PLCs.
For engineers reviewing the SN74LVC8T245 datasheet, SN74LVC8T245 pinout, SN74LVC8T245 application, or SN74LVC8T245 equivalent, key selection criteria include configurable dual-rail operation (1.65–5.5V per rail), glitch-free power sequencing, VCC isolation behavior, ±32mA drive strength at 5V, and TSSOP-24 package compatibility with standard PCB layout practices.
Technical Context
The SN74LVC8T245 implements a fully asynchronous, direction-controlled bidirectional data path: DIR high enables A→B transmission; DIR low enables B→A transmission; OE high forces both ports into high-impedance state. Control logic (DIR/OE) is referenced solely to VCCA, while A-port I/Os track VCCA and B-port I/Os track VCCB - enabling robust level translation across 1.8V/2.5V/3.3V/5V node combinations.
Its architecture integrates VCC isolation (outputs disable when either VCCA or VCCB <100mV), Ioff protection (prevents backflow during partial power-down), and balanced CMOS push-pull outputs with matched sink/source capability. Propagation delays range from 0.3ns to 23.8ns depending on supply pair and signal direction, with tPHZ/tPLZ up to 32.2ns under worst-case VCCA=1.8V/VCCB=5V conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - supports translation between any common low-voltage nodes (1.8V↔2.5V, 1.8V↔3.3V, 3.3V↔5V) without external biasing. |
| IOH / IOL Drive | ±32mA at 5V - sufficient to drive multiple LVC loads or moderate capacitive traces without external buffers. |
| tPLH / tPHL Max | 23.8ns (B→A, VCCA=1.8V/VCCB=5V) - defines maximum data rate limit (~42MHz NRZ) in worst-case voltage translation scenario. |
| Ioff Leakage | ±2μA max - ensures negligible current flow into powered-down rails, critical for system-level power gating integrity. |
| ESD Rating | ±4000V HBM - meets industrial IEC 61000-4-2 system-level ESD immunity requirements when properly decoupled. |
| Operating Temp | –40°C to +85°C - qualified for extended-temperature industrial control and computing applications. |
| Supply Sequencing | Glitch-free - allows VCCA and VCCB to power up/down in any order without spurious output transitions. |
Pinout & Package
TSSOP-24 (PW) package: 7.8mm × 6.4mm body, 0.65mm lead pitch, exposed thermal pad not present (RHL variant has pad; PW does not).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply reference | 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 data flow; referenced to VCCA, not VCCB. |
| A1–A8 (Pins 3–10) | A-port bidirectional I/Os | Track VCCA voltage; require external pull-up/down if unused to prevent floating inputs and excess ICC. |
| GND (Pins 11–13) | Ground return | Three dedicated GND pins minimize ground bounce; all must be connected to common system ground plane. |
| B8–B1 (Pins 14–21) | B-port bidirectional I/Os | Track VCCB voltage; electrically isolated from A-port except through transceiver core. |
| OE (Pin 22) | Output-enable input | High = both ports in high-Z; low = active translation per DIR state; referenced to VCCA. |
| VCCB (Pins 23–24) | B-port supply reference | Powers B-side I/Os; disconnecting VCCB <100mV forces all B- and A-ports into high-Z via VCC isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.65–5.5V operation on VCCA and VCCB enables interoperability across 1.8V/2.5V/3.3V/5V subsystems without level-shifter ICs. |
| VCC isolation | Automatic high-impedance output disable when either VCCA or VCCB drops below 100mV - prevents bus contention during brownout or hot-swap events. |
| Ioff partial-power-down | Blocks reverse current flow into powered-down supplies, protecting upstream regulators and meeting IEC 62368-1 safe power-down requirements. |
| Glitch-free sequencing | Eliminates need for power-rail ramp-order control circuitry - simplifies system power management design and reduces BOM count. |
| Robust ESD protection | 4000V HBM rating allows direct integration into board-edge connectors or unshielded front-panel interfaces without added TVS diodes. |
Applications
| Industrial PLC Backplane Interface | Flat-Panel Monitor Controller Bridge |
|---|---|
|
Use Scenario: Interfacing a 3.3V FPGA-based motion controller with legacy 5V I/O modules over a shared backplane bus. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing data flow between mismatched supply domains while maintaining signal integrity at 25MHz update rates. Use Value: Eliminates need for discrete resistor-divider or MOSFET-based level shifters, reducing layout area by >40% and improving timing margin by removing RC delay uncertainty. |
Use Scenario: Connecting a 1.8V video processor SoC to a 5V timing controller and display interface in consumer sound bar systems. IC Role / Device Role / Timing Role: Direction-controlled bus transceiver synchronizing pixel clock and data lanes across voltage domains with sub-10ns skew control. Use Value: Enables direct SoC-to-panel connectivity without custom ASICs, cutting development time by 3 weeks and supporting HDMI 1.4b timing compliance. |
| Network-Attached Storage SATA Link Buffer | Ultrasound Scanner Data Acquisition Interface |
|
Use Scenario: Isolating 3.3V host controller signals from 5V SATA PHY transceivers in embedded NAS enclosures with thermal constraints. IC Role / Device Role / Timing Role: High-drive (±24mA @ 3.3V) transceiver buffering command/status lines while providing VCCB-disconnect safety during hot-plug events. Use Value: Prevents latch-up during SATA cable insertion by enforcing automatic high-Z on loss of VCCB, satisfying SATA 3.0 hot-swap reliability requirements. |
Use Scenario: Bridging 2.5V ADC/DAC channels to 3.3V FPGA processing blocks in portable ultrasound probe electronics. IC Role / Device Role / Timing Role: Low-skew (tPHL ≤ 6.2ns @ VCCA=2.5V/VCCB=3.3V), low-noise transceiver preserving analog sampling fidelity in real-time beamforming paths. Use Value: Maintains <0.1% gain error across temperature by eliminating voltage-dependent threshold shifts inherent in passive translation methods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245 | Lower VCC range (1.2V–3.6V); higher speed (tPLH ≤ 3.2ns @ 1.8V); no VCC isolation feature. | Optimized for ultra-low-voltage mobile SoC interconnects; unsuitable for 5V domain translation or brownout-safe isolation. | Select when interfacing 1.2V/1.8V cores only and maximum speed >100MHz is required; avoid for mixed 5V systems. |
| TXB0108 | Auto-direction sensing (no DIR pin); lower drive (±20mA); supports down-to-1.2V translation; no Ioff spec. | Used in UART/SPI buses where direction is implicit; lacks deterministic control for synchronous parallel buses like address/data multiplexing. | Prefer for simple serial links with automatic direction detection; reject for 8-bit parallel bus control requiring explicit DIR timing coordination. |
Compared with SN74AVC8T245 and TXB0108, the SN74LVC8T245 uniquely balances wide voltage coverage (1.65–5.5V), deterministic DIR control, VCC isolation, and industrial temperature range - making it the only option among the three qualified for 5V-tolerant industrial backplane designs requiring fail-safe power sequencing.
Availability
SN74LVC8T245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, flat-panel monitor controller bridges, network-attached storage SATA link buffering, and ultrasound scanner data acquisition interfaces requiring stable component supply across extended temperature and mixed-voltage environments.
Supply support for SN74LVC8T245 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 logic solutions with over 50 years of innovation in industrial, automotive, and communications markets.
The SN74LVC8T245 belongs to TI's LVC logic family, designed specifically for robust, low-power voltage translation in mixed-supply systems where reliability under variable power sequencing and wide I/O voltage ranges is mandatory.
FAQ
What is the minimum operating voltage for SN74LVC8T245 on VCCA and VCCB?
The SN74LVC8T245 supports a minimum supply voltage of 1.65V on both VCCA and VCCB rails. Operation below this threshold is not guaranteed - the device enters undefined behavior, and VCC isolation may not activate reliably. For sub-1.65V translation, TI recommends the AXC family instead of the SN74LVC8T245.
Can SN74LVC8T245 translate between 1.8V and 5V in both directions simultaneously?
No - the SN74LVC8T245 performs unidirectional translation per transaction, controlled by the DIR pin. When DIR is high, data flows A→B (e.g., 1.8V→5V); when DIR is low, data flows B→A (e.g., 5V→1.8V). Simultaneous bidirectional operation on the same bus is not supported; the SN74LVC8T245 requires explicit direction control per data transfer cycle.
How does the VCC isolation feature behave if VCCA is disconnected while VCCB remains powered?
If VCCA drops below 100mV or floats while VCCB remains powered, the SN74LVC8T245 disables all outputs and places both A and B ports in high-impedance state - regardless of DIR or OE state. This prevents bus contention and backdrive current into the unpowered A-side logic, a critical safety function verified per JESD78 Class II latch-up testing.
Is a pull-up resistor required on the OE pin of SN74LVC8T245 during power-up?
Yes - to ensure the SN74LVC8T245 starts in high-impedance state during power sequencing, tie OE to VCCA via a pull-up resistor (typically 10kΩ). This prevents unintended data transmission before both VCCA and VCCB stabilize. The resistor value must exceed the current-sinking capability of the driving source but remain low enough to overcome leakage (≤±2μA Ioff).
Does SN74LVC8T245 support hot-swap operation in systems with live backplanes?
Yes - the combination of VCC isolation, Ioff, and glitch-free sequencing makes the SN74LVC8T245 suitable for hot-swap applications. When VCCB is disconnected during insertion, outputs go high-Z within microseconds; Ioff limits reverse current to ≤2μA, protecting upstream 5V supplies. TI validates this behavior per JEDEC JESD78 latch-up and JESD22 ESD standards.
SN74LVC8T245PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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-TSSOP
SN74LVC8T245PWG4 FAQ
1.How can I place an order for SN74LVC8T245PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245PWG4 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 SN74LVC8T245PWG4 reliable?
The price and inventory of SN74LVC8T245PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC8T245PWG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC8T245PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC8T245PWG4 transactions.
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4.How is shipping managed for SN74LVC8T245PWG4?
SN74LVC8T245PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC8T245PWG4 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 SN74LVC8T245PWG4?
For technical support, including SN74LVC8T245PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245PWG4 requirements.
6.How does Aetrix verify that SN74LVC8T245PWG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245PWG4 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 SN74LVC8T245PWG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245PWG4?
All SN74LVC8T245PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245PWG4, 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 SN74LVC8T245PWG4 part is unused and in its original packaging.
Return procedure for SN74LVC8T245PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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