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Texas Instruments SN74LVC8T245DWR
- Part No.:
- SN74LVC8T245DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC8T245DWR.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:12,228
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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.
For engineers reviewing the SN74LVC8T245 datasheet, SN74LVC8T245 pinout, SN74LVC8T245 application, or SN74LVC8T245 equivalent, this page delivers verified electrical specs, functional mode mapping, thermal performance per package variant, real-world translation timing (e.g., tPLH ≤ 0.4 ns at 5V→5V), and validated alternative options for voltage translation design.
Technical Context
The SN74LVC8T245 implements a fully configurable dual-rail architecture where A-port I/Os track VCCA (1.65–5.5V) and B-port I/Os track VCCB (1.65–5.5V), enabling translation across 1.8V/2.5V/3.3V/5V nodes. Direction control (DIR) and output enable (OE) are both referenced to VCCA, ensuring consistent logic thresholds regardless of VCCB level.
VCC isolation activates when either VCCA or VCCB falls below 100 mV or floats, forcing all I/Os into high-impedance state without glitching. Ioff circuitry limits leakage to ±2 μA during power-down, preventing backflow current while maintaining safe input/output biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - enables universal bidirectional translation between any pair of common logic voltages (1.8V↔3.3V, 2.5V↔5V, etc.) |
| Max Output Drive | ±32 mA at 5V - supports driving moderate capacitive loads or paralleling outputs for higher current |
| tPLH / tPHL (A→B) | 0.4 ns min / 4.2 ns max at VCCA=VCCB=5V - ensures sub-5ns propagation for high-speed data handshaking |
| Ioff Leakage | ±2 μA max - guarantees safe partial-power-down operation with no damaging backflow current |
| ESD Rating (HBM) | ±4000 V - meets industrial-grade robustness requirements without external protection |
| Operating Temp | –40°C to +85°C - qualified for commercial and extended industrial ambient conditions |
| Logic Thresholds | VIH/VIL referenced to VCCA - eliminates ambiguity in control signal interpretation during rail mismatch |
Pinout & Package
SN74LVC8T245DWR uses the DW (SOIC-24) package: 15.4 mm × 7.5 mm body, 2.54 mm pitch, surface-mount, with exposed thermal pad not present (RHL variant only). Pin count: 24. Mounting compatible with standard SOIC-24 footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply reference | Sets logic thresholds for DIR, OE, and A-side I/Os; must be stable before enabling |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A data flow; referenced to VCCA |
| A1–A8 (Pins 3–10) | A-port bidirectional I/Os | Track VCCA; must be driven HIGH/LOW (no floating) to prevent excess ICCZ |
| GND (Pins 11–13) | Ground return | Three dedicated GND pins reduce ground bounce and improve noise immunity |
| B8–B1 (Pins 14–21) | B-port bidirectional I/Os | Track VCCB; electrically isolated from A-side except through transceiver path |
| OE (Pin 22) | Output-enable input | High = all outputs high-Z; Low = directionally enabled; referenced to VCCA |
| VCCB (Pins 23–24) | B-port supply reference | Independent of VCCA; supports asynchronous power sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Configurable dual-rail operation | Enables simultaneous 1.8V↔5V translation without external level shifters or voltage regulators |
| VCC isolation & disconnect | Automatically places all I/Os in high-Z if either VCCA or VCCB drops below 100 mV or floats - prevents bus contention during power sequencing |
| Glitch-free power sequencing | Allows VCCA and VCCB to be powered up/down in any order without spurious output transitions that could corrupt downstream logic |
| Ioff partial-power-down support | Limits I/O leakage to ±2 μA when unpowered, eliminating need for external isolation switches in hot-swap systems |
| Robust ESD protection | 4000V HBM and 1000V CDM ratings eliminate requirement for discrete TVS diodes in most board-level designs |
Applications
| Industrial PLC Backplane Interface | Embedded Compute Module Interconnect |
|---|---|
|
Use Scenario: Connecting a 3.3V ARM-based controller to legacy 5V I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing data flow between CPU and field I/O cards via parallel bus. Use Value: Eliminates need for discrete level-shifting ICs per signal line; supports full 8-bit parallel transfer with <4.2ns propagation delay at 5V. |
Use Scenario: Interfacing a 1.8V SoC with 3.3V DDR memory and peripheral controllers on a compact compute module. IC Role / Device Role / Timing Role: Dual-rail bus transceiver enabling synchronous data exchange across voltage domains on shared address/data lines. Use Value: Maintains signal integrity with balanced push-pull outputs; Ioff prevents backfeed during SoC sleep states. |
| Flat-Panel Display Timing Controller Bridge | Network-Attached Storage SATA/PCIe Sideband Translation |
|
Use Scenario: Translating control signals (e.g., I²C, GPIO, reset) between a 2.5V display timing controller and 1.8V panel driver ICs. IC Role / Device Role / Timing Role: Low-voltage bidirectional translator handling configuration and status signaling with minimal propagation skew. Use Value: Supports 1.65V–5.5V range - covers all common display interface voltages; 0.4ns min tPLH ensures precise timing alignment. |
Use Scenario: Level-shifting sideband signals (e.g., SMBus, CLKREQ#, PERST#) between 3.3V host controller and 1.8V NVMe SSD in NAS enclosures. IC Role / Device Role / Timing Role: Isolated voltage translator providing fault-tolerant signaling with VCC disconnect behavior during hot-plug events. Use Value: VCC isolation forces high-Z on all I/Os if either rail fails - prevents bus lockup during drive insertion/removal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXB0108PWR | Auto-direction sensing (no DIR pin); lower drive (±24 mA); supports down-to-1.2V translation | Better suited for I²C/SPI with automatic direction detection; not ideal for high-current parallel buses | Select TXB0108PWR when direction is data-dependent and low-voltage (<1.65V) translation is required |
| SN74AVC8T245RHLR | VQFN-24 (5.5mm × 3.5mm); higher speed (tPLH ≤ 0.25 ns at 3.3V); same dual-rail architecture | Preferred for space-constrained PCBs requiring improved thermal performance (RθJA = 48.3°C/W) | Select SN74AVC8T245RHLR when board area is limited and junction temperature rise must be minimized |
Compared with SN74LVC8T245DWR, TXB0108PWR removes direction-control complexity but sacrifices drive strength and deterministic timing, while SN74AVC8T245RHLR retains identical functionality in a thermally superior, smaller footprint - making it optimal for dense, high-power-density designs.
Availability
SN74LVC8T245DWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded compute modules, flat-panel display bridges, and network-attached storage systems requiring stable component supply and long-term obsolescence management.
Supply support for SN74LVC8T245DWR 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 over 90 years of innovation in precision analog and logic solutions.
The SN74LVC8T245 belongs to TI's LVC logic family, designed specifically for robust, low-voltage bidirectional level translation in mixed-supply systems - targeting industrial automation, computing, and consumer electronics where rail independence and power sequencing resilience are critical.
FAQ
What voltage ranges does the SN74LVC8T245DWR support on its A and B ports?
The SN74LVC8T245DWR supports 1.65V to 5.5V independently on both VCCA (A port) and VCCB (B port), enabling translation between any combination of standard logic voltages including 1.8V↔3.3V, 2.5V↔5V, and 3.3V↔5V. This range is guaranteed across the full –40°C to +85°C operating temperature.
How does the SN74LVC8T245DWR handle power sequencing when VCCA and VCCB are ramped at different times?
The SN74LVC8T245DWR provides glitch-free power sequencing: either VCCA or VCCB may be powered up or down in any order without causing spurious output transitions. Its internal architecture ensures outputs remain stable or enter high-impedance state cleanly - critical for avoiding false resets or data corruption in mixed-rail systems.
What happens to the I/Os of the SN74LVC8T245DWR if one supply rail is disconnected during operation?
If either VCCA or VCCB drops below 100 mV or floats, the SN74LVC8T245DWR activates its VCC isolation feature: all A- and B-port I/Os immediately enter a high-impedance state. This prevents bus contention and protects downstream devices - a key safety mechanism during hot-swap or partial-failure scenarios.
Can unused I/O pins on the SN74LVC8T245DWR be left floating?
No - unused I/O pins on the SN74LVC8T245DWR must be actively driven HIGH or LOW (preferably to VCCA, VCCB, or GND) to prevent excess ICC and ICCZ current. Floating inputs cause undefined logic states and increased power consumption; TI recommends tying unused A/B pins to their respective supply rails or ground.
Does the SN74LVC8T245DWR support partial-power-down operation, and how is it implemented?
Yes - the SN74LVC8T245DWR implements Ioff partial-power-down: when either VCCA or VCCB is at 0V, the Ioff circuitry disables all outputs and limits I/O leakage to ±2 μA maximum. This prevents damaging backflow current into powered-down sections of the system, supporting safe hot-swap and low-power standby modes.
SN74LVC8T245DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- 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-SOIC
SN74LVC8T245DWR FAQ
1.How can I place an order for SN74LVC8T245DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245DWR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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5.How can I obtain technical support or documentation for SN74LVC8T245DWR?
For technical support, including SN74LVC8T245DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245DWR requirements.
6.How does Aetrix verify that SN74LVC8T245DWR is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245DWR 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 SN74LVC8T245DWR meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245DWR?
All SN74LVC8T245DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245DWR, 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 SN74LVC8T245DWR part is unused and in its original packaging.
Return procedure for SN74LVC8T245DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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