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Texas Instruments SN74LVC8T245PWR
- Part No.:
- SN74LVC8T245PWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC8T245PWR.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,069
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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 configurable VCCA/VCCB rails, 3-state outputs controlled by DIR/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 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 dual-rail voltage flexibility (1.65–5.5V per rail), glitch-free power sequencing, VCC isolation behavior, Ioff leakage specification (<±2 µA), and TSSOP-24 package compatibility with high-density PCB layouts.
Technical Context
The SN74LVC8T245 implements asynchronous bidirectional data flow using a direction-control (DIR) signal referenced to VCCA and an output-enable (OE) signal also referenced to VCCA. Its dual-rail architecture decouples A-port I/Os (tracked to VCCA) from B-port I/Os (tracked to VCCB), enabling translation across 1.8V/2.5V/3.3V/5V nodes without level-shifter ICs. The control logic ensures no bus contention during direction switching.
VCC isolation and Ioff circuitry enforce high-impedance outputs when either VCCA or VCCB drops below 100 mV or floats, preventing backfeed current and ensuring safe partial-power-down. Input thresholds scale with VCCA (VIH = VCCA × 0.7, VIL = VCCA × 0.3), while output drive strength scales with supply voltage - delivering up to ±32 mA at 5V with typical propagation delays under 7 ns (VCCA = 3.3V, VCCB = 5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - enables universal translation between 1.8V, 2.5V, 3.3V, and 5V logic domains without external biasing. |
| Propagation Delay (tPLH/tPHL) | As low as 0.3 ns (min) to 7.4 ns (max) - supports >100 MHz data rates in point-to-point links with matched timing budgets. |
| Output Drive Strength | ±32 mA at 5V - sufficient to drive standard CMOS loads and parallel termination without external buffers. |
| Ioff Leakage | <±2 µA - prevents damaging back-current during power sequencing or hot-swap events in multi-rail systems. |
| ESD Rating (HBM) | ±4000 V - exceeds JEDEC JS-001 Class 2, supporting robust handling in manufacturing and field deployment. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and commercial environments including CNC controllers and network storage. |
| Supply Current (ICCA + ICCB) | 12 µA max - enables ultra-low static power in always-on interface bridges and battery-backed subsystems. |
Pinout & Package
TSSOP-24 (PW) package: 7.8 mm × 6.4 mm, 0.65 mm pitch, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply rail | Powers A-side I/Os and references DIR/OE input thresholds; must be stable before enabling outputs. |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A flow; referenced to VCCA; determines active output port. |
| A1–A8 (Pins 3–10) | A-port bidirectional I/Os | Track VCCA; accept 1.65–5.5V logic levels; require defined HIGH/LOW states to avoid excess ICCZ. |
| GND (Pins 11–13) | Ground reference | Three dedicated GND pins minimize ground bounce and improve noise immunity in high-speed switching. |
| B8–B1 (Pins 14–21) | B-port bidirectional I/Os | Track VCCB; accept 1.65–5.5V logic levels; electrically isolated from A-port except through transceiver path. |
| OE (Pin 22) | Output enable input | High = all outputs high-Z; Low = outputs enabled per DIR state; referenced to VCCA. |
| VCCB (Pins 23–24) | B-port supply rail | Powers B-side I/Os; independent of VCCA; supports glitch-free sequencing regardless of ramp order. |
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 buses without external components. |
| VCC isolation | Automatic high-impedance output disable when either VCCA or VCCB falls below 100 mV - prevents bus contention during brownout or hot-swap. |
| Ioff partial-power-down | Blocks backflow current into powered-down rails; limits I/O leakage to <±2 µA - critical for system-level power gating. |
| Glitch-free power sequencing | No required power-up order between VCCA and VCCB - eliminates risk of false logic transitions during supply ramping. |
| Scalable output drive | Output current scales with supply voltage (±4 mA at 1.65V, ±32 mA at 5V), maintaining signal integrity across voltage domains. |
Applications
| Industrial PLC Interface | Flat-Panel Monitor Control |
|---|---|
Use Scenario: Interfacing a 3.3V FPGA I/O bank to legacy 5V display timing controller in an embedded monitor design. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing command/data exchange between FPGA and timing controller across mismatched voltage domains. Use Value: Eliminates need for discrete level-shifters or resistor networks; supports full 8-bit parallel bus operation with sub-10 ns propagation delay. |
Use Scenario: Connecting a 1.8V audio processor to a 5V HDMI transmitter IC in a sound bar system. IC Role / Device Role / Timing Role: Asynchronous bus transceiver translating control signals (I²C-like commands) and status flags between voltage domains. Use Value: Enables direct connection without pull-up resistors or additional buffering; maintains signal integrity with <±2 µA Ioff leakage during standby. |
| CNC Motion Controller | Network-Attached Storage |
Use Scenario: Isolating 2.5V microcontroller GPIOs from 3.3V motor driver interface in a precision CNC axis module. IC Role / Device Role / Timing Role: Direction-controlled transceiver enabling real-time position feedback and command transmission across voltage boundaries. Use Value: Supports fast direction toggling (DIR-controlled) with guaranteed high-Z during OE assertion - prevents bus conflicts during fault recovery. |
Use Scenario: Bridging 3.3V SATA controller logic to 5V power management ICs in enterprise NAS enclosure firmware interfaces. IC Role / Device Role / Timing Role: 3-state-enabled bus translator managing configuration register access and status polling between host and PMIC. Use Value: VCC isolation ensures safe shutdown of PMIC rail without affecting controller domain; Ioff prevents backfeed into powered-down subsystems. |
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); faster tPLH/tPHL (≤3.5 ns); higher Ioff (±10 µA) | Optimized for sub-1.8V systems (e.g., mobile SoCs); not suitable for 5V interfaces | Select when interfacing 1.2V/1.5V/1.8V domains only; avoid for 3.3V↔5V translation. |
| TXB0108 | Auto-direction sensing (no DIR pin); 1.2V–3.6V VCCA/VCCB; lower drive (±24 mA @ 3.3V) | Eliminates direction-control logic but adds latency (~20 ns) and limits max voltage to 3.6V | Choose for simple unidirectional or auto-sensed bidirectional links where DIR pin overhead is undesirable. |
Compared with SN74AVC8T245 and TXB0108, the SN74LVC8T245 uniquely supports full 1.65V–5.5V dual-rail operation with deterministic DIR control, making it the only option among the three for robust 3.3V↔5V industrial interface bridging with guaranteed glitch-free sequencing.
Availability
SN74LVC8T245 is available at Aetrix Electronics and suitable for industrial PLCs, flat-panel monitor control systems, and network-attached storage designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVC8T245 belongs to TI's LVC logic family, designed specifically for low-voltage, high-speed bidirectional bus translation in mixed-voltage embedded systems - emphasizing robustness, power sequencing resilience, and wide voltage interoperability.
FAQ
What voltage ranges does the SN74LVC8T245 support on its A and B ports?
The SN74LVC8T245 supports independent 1.65V to 5.5V operation on both VCCA (A port) and VCCB (B port). This allows translation between any combination of 1.8V, 2.5V, 3.3V, and 5V logic domains. Each port's I/Os track their respective supply, and input thresholds (VIH/VIL) scale with VCCA - ensuring reliable switching across the full range without external biasing.
How does the SN74LVC8T245 handle power sequencing when VCCA and VCCB are powered up at different times?
The SN74LVC8T245 features glitch-free power sequencing: either VCCA or VCCB may be powered on or off in any order without causing erroneous output transitions. If one supply drops below 100 mV or floats, the VCC isolation feature forces all I/Os into high-impedance mode - preventing bus contention or false signaling. This behavior is intrinsic to the silicon design and requires no external circuitry.
Can the SN74LVC8T245 be used in partial-power-down applications?
Yes - the SN74LVC8T245 includes Ioff circuitry that disables I/O outputs and limits leakage current to <±2 µA when either VCCA or VCCB is at 0 V. This prevents damaging backflow current into powered-down sections of a system, making the SN74LVC8T245 suitable for applications requiring dynamic power gating, such as portable industrial HMIs or energy-efficient NAS enclosures.
What is the function of the DIR and OE pins, and how are they referenced?
DIR (Pin 2) controls data direction: high enables A→B transmission, low enables B→A. OE (Pin 22) enables/disables all outputs: low activates outputs per DIR state, high places both A and B ports in high-impedance mode. Both DIR and OE are referenced to VCCA - meaning their VIH/VIL thresholds scale with VCCA (e.g., VIH = VCCA × 0.7), not VCCB or system ground.
Is the SN74LVC8T245 compatible with TSSOP-24 PCB footprints from other manufacturers?
Yes - the SN74LVC8T245 in PW package (TSSOP-24) adheres to JEDEC MO-153 standards: 7.8 mm × 6.4 mm body, 0.65 mm lead pitch, and 1.2 mm maximum height. Its footprint matches industry-standard TSSOP-24 land patterns used for compatible devices like 74LVC series transceivers, enabling drop-in replacement in existing layouts without redesign.
SN74LVC8T245PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-TSSOP (0.173", 4.40mm 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-TSSOP
SN74LVC8T245PWR FAQ
1.How can I place an order for SN74LVC8T245PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245PWR 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 SN74LVC8T245PWR reliable?
The price and inventory of SN74LVC8T245PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC8T245PWR is usually 5 days.
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Once your SN74LVC8T245PWR 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 SN74LVC8T245PWR?
For technical support, including SN74LVC8T245PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245PWR requirements.
6.How does Aetrix verify that SN74LVC8T245PWR is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245PWR 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 SN74LVC8T245PWR meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245PWR?
All SN74LVC8T245PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245PWR, 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 SN74LVC8T245PWR part is unused and in its original packaging.
Return procedure for SN74LVC8T245PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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