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Texas Instruments SN74LVC8T245NSR
- Part No.:
- SN74LVC8T245NSR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC8T245NSR.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:609
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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 (1.65–5.5V) and VCCB (1.65–5.5V) 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 microcontrollers interfacing with 5V peripherals.
For engineers reviewing the SN74LVC8T245 datasheet, SN74LVC8T245 pinout, SN74LVC8T245 application, or SN74LVC8T245 equivalent, key selection criteria include configurable dual-rail operation, glitch-free power sequencing, VCC isolation behavior, robust ESD protection (4000V HBM), and compatibility with 1.8V/2.5V/3.3V/5V node translation.
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 allows A-port I/Os to track VCCA and B-port I/Os to track VCCB, enabling translation across any combination of 1.65V–5.5V supply domains without level-shifter external components.
It integrates VCC isolation: if either VCCA or VCCB falls below 100 mV or floats, all I/Os enter high-impedance state. The Ioff circuitry ensures <±2 µA leakage when either supply is at 0 V, preventing backflow current during partial power-down - critical for hot-swap and low-power standby modes.
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 |
| Propagation Delay (tPLH/tPHL) | As low as 0.3 ns (VCCA=5V, VCCB=5V) - supports >100 MHz data rates in short-trace applications |
| Output Drive Strength | ±32 mA at 5V - sufficient to drive standard CMOS loads and parallel multiple outputs for higher current |
| Ioff Leakage | ±2 µA max - prevents damaging backflow when one supply is powered off while the other remains active |
| ESD Rating (HBM) | ±4000 V - exceeds JEDEC JS-001 Class II, suitable for handling in standard manufacturing environments |
| Operating Temperature | –40°C to +85°C - qualified for industrial and commercial embedded systems |
| Logic Family | LVC - provides 3.3V-compatible input thresholds with 5V-tolerant I/Os and rail-to-rail swing |
Pinout & Package
SN74LVC8T245NSR uses the NS (SOIC-24) package: 15.4 mm × 7.5 mm body, 0.635 mm lead pitch, surface-mount, plastic dual in-line. Pin 1 = VCCA; pins 11–13 = GND; pins 23–24 = VCCB; pin 2 = DIR; pin 22 = OE; pins 3–10 = A1–A8; pins 14–21 = B8–B1 (reversed order).
| 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 |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A; referenced to VCCA; no internal pullup/pulldown |
| A1–A8 (Pins 3–10) | A-port bidirectional I/Os | Track VCCA voltage; always active - must be driven HIGH/LOW to avoid excess ICCZ |
| GND (Pins 11–13) | Ground return | Three dedicated ground pins reduce ground bounce and improve noise immunity in high-speed switching |
| B8–B1 (Pins 14–21) | B-port bidirectional I/Os | Track VCCB voltage; reversed physical order matches standard bus layout conventions |
| 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 reference | Dual VCCB pins lower impedance path and improve decoupling for B-side switching currents |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail operation | Independent VCCA and VCCB supplies (1.65–5.5V) allow arbitrary voltage translation without external biasing |
| Glitch-free power sequencing | Either VCCA or VCCB may power up/down in any order without causing spurious output transitions |
| VCC isolation & disconnect | If VCCA or VCCB drops below 100 mV or floats, all I/Os automatically enter high-impedance state |
| Ioff partial-power-down support | Prevents backflow current when one supply is off - essential for hot-plug and battery-backed subsystems |
| Robust ESD protection | 4000V HBM and 1000V CDM ratings meet industrial handling requirements without added protection circuitry |
Applications
| Industrial PLC Interface | Embedded Computing Interconnect |
|---|---|
Use Scenario: Connecting a 3.3V ARM-based controller to legacy 5V I/O modules in programmable logic controllers. IC Role / Device Role: Bidirectional voltage translator isolating logic domains while preserving signal integrity and timing margins. Use Value: Eliminates need for discrete level-shifting ICs or resistor networks, reducing BOM count and PCB area. |
Use Scenario: Enabling communication between a 1.8V FPGA I/O bank and a 2.5V memory subsystem in edge AI accelerators. IC Role / Device Role: Synchronous bus transceiver supporting multi-gigabit data throughput with sub-nanosecond skew control. Use Value: Maintains signal fidelity across voltage domains without adding propagation delay beyond 21.9 ns (max). |
| Flat-Panel Display Timing Control | Network Storage Data Path |
Use Scenario: Translating timing signals and pixel data between a 1.8V video processor and a 5V display driver IC in sound bars and monitors. IC Role / Device Role: Level-translating transceiver with 3-state outputs synchronized to display blanking intervals. Use Value: Enables clean bus release during vertical/horizontal sync, preventing display artifacts from floating lines. |
Use Scenario: Bridging SATA host controller (3.3V) and NVMe SSD interface (1.8V) in network-attached storage enclosures. IC Role / Device Role: High-drive bidirectional buffer supporting burst-mode transfers with ±32 mA output capability. Use Value: Sustains reliable signaling under heavy capacitive loading from long traces and multiple connectors. |
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 where direction is inferred; not ideal for synchronous parallel buses requiring explicit DIR control | Choose TXB0108PWR only if auto-direction operation is required and 1.2V–3.3V translation suffices |
| SN74AVC8T245RHLR | VQFN-24 (5.5 mm × 3.5 mm); same electrical specs; higher thermal performance (RθJA = 48.3°C/W) | Preferred for space-constrained designs needing improved power dissipation and board-level thermal management | Choose SN74AVC8T245RHLR when footprint reduction and thermal headroom outweigh SOIC-24 manufacturability benefits |
Compared with TXB0108PWR and SN74AVC8T245RHLR, SN74LVC8T245NSR offers deterministic DIR-controlled operation in a mature, widely supported SOIC package - making it optimal for industrial control and legacy system upgrades where layout stability and long-term sourcing matter.
Availability
SN74LVC8T245NSR is available at Aetrix Electronics and suitable for industrial PLC interfaces, embedded computing interconnects, flat-panel display timing control, and network storage data paths requiring stable component supply, long lifecycle assurance, and consistent parametric performance.
Supply support for SN74LVC8T245NSR 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, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications.
The SN74LVC8T245 belongs to TI's LVC logic family - engineered for low-voltage, high-speed bidirectional translation in mixed-supply systems where reliability, ESD robustness, and power sequencing resilience are critical.
FAQ
What voltage ranges does the SN74LVC8T245NSR support on its A and B ports?
The SN74LVC8T245NSR supports 1.65V to 5.5V on both VCCA (A port) and VCCB (B port), enabling bidirectional translation between any pair of common logic voltages - including 1.8V ↔ 2.5V, 1.8V ↔ 3.3V, 1.8V ↔ 5V, 2.5V ↔ 3.3V, and 3.3V ↔ 5V. Each port's I/Os track their respective supply, and VIH/VIL thresholds scale with VCCA.
How does the SN74LVC8T245NSR handle power sequencing when VCCA and VCCB are powered independently?
The SN74LVC8T245NSR features glitch-free power sequencing: either VCCA or VCCB may be powered on or off in any order without causing unintended output transitions. If either supply drops below 100 mV or floats, the VCC isolation feature forces all I/Os into high-impedance state - protecting downstream devices from false logic states during ramp-up or brownout conditions.
Can the SN74LVC8T245NSR be used in partial-power-down mode, and how is it implemented?
Yes - the SN74LVC8T245NSR supports partial-power-down via its Ioff circuitry. When either VCCA or VCCB is at 0 V, the Ioff function disables all I/O outputs, limiting leakage to ±2 µA maximum. This prevents damaging backflow current into a powered-down domain, making SN74LVC8T245NSR suitable for hot-swap and battery-backed subsystems where supply domains power up/down asynchronously.
What is the role of the DIR and OE pins, and are they referenced to VCCA or VCCB?
Both DIR (direction control) and OE (output enable) pins are referenced to VCCA - meaning their VIH/VIL thresholds depend on VCCA voltage. DIR high enables A→B data flow; DIR low enables B→A. OE high places all outputs in high-impedance state regardless of DIR. Pulling OE high during power-up ensures safe initialization before VCCA and VCCB stabilize.
Does the SN74LVC8T245NSR require external pull-up or pull-down resistors on unused I/O pins?
Yes - all unused A-port and B-port I/O pins must be actively driven HIGH or LOW (preferably to VCCA, VCCB, or GND) to prevent excess ICC and ICCZ current and ensure predictable logic states. Floating I/Os are not permitted; TI recommends tying unused pins to GND for lowest power and noise immunity. Control inputs (DIR, OE) must also be held at valid VCCA-referenced logic levels.
SN74LVC8T245NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-SOIC (0.209", 5.30mm 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-SO
SN74LVC8T245NSR FAQ
1.How can I place an order for SN74LVC8T245NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245NSR 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 SN74LVC8T245NSR reliable?
The price and inventory of SN74LVC8T245NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC8T245NSR is usually 5 days.
3.What payment methods are accepted for SN74LVC8T245NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC8T245NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC8T245NSR?
SN74LVC8T245NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC8T245NSR 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 SN74LVC8T245NSR?
For technical support, including SN74LVC8T245NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245NSR requirements.
6.How does Aetrix verify that SN74LVC8T245NSR is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245NSR 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 SN74LVC8T245NSR meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245NSR?
All SN74LVC8T245NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245NSR, 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 SN74LVC8T245NSR part is unused and in its original packaging.
Return procedure for SN74LVC8T245NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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