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Texas Instruments SN74LVC8T245DWRG4
- Part No.:
- SN74LVC8T245DWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC8T245DWRG4.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24SOIC
- 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 3.3V or 5V peripherals.
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 rail), glitch-free power sequencing, VCC isolation behavior, Ioff leakage specification (<±2 µA), and 24-pin SSOP package compatibility with industrial temperature range (–40°C to 85°C).
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 (1.65V–5.5V) and B-port I/Os to track VCCB (1.65V–5.5V), enabling translation across 1.8V/2.5V/3.3V/5V nodes without external level-shifting circuitry.
Functional modes are defined by OE and DIR logic states: OE = L + DIR = H enables A→B transmission; OE = L + DIR = L enables B→A transmission; OE = H places both ports in high-impedance state. The device maintains robust operation during uncontrolled power-up/down sequences due to its VCC isolation feature - if either VCCA or VCCB falls below 100 mV or floats, all outputs enter high-Z.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - supports translation between any common logic voltage nodes (1.8V, 2.5V, 3.3V, 5V) without external components. |
| Propagation Delay (tPLH/tPHL) | As low as 0.3 ns (VCCA=5V, VCCB=5V) - ensures timing-critical bidirectional data transfer in high-speed digital interfaces. |
| Ioff Leakage | <±2 µA at 5.5V - prevents damaging backflow current when one supply is powered down, enabling safe partial-power-down mode. |
| ESD Protection | ±4000V HBM, ±1000V CDM - meets industrial-grade ESD robustness requirements for board-level reliability. |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments including PLCs, CNC controllers, and network storage systems. |
| Output Drive Strength | ±32 mA at 5V - sufficient to drive moderate capacitive loads and multiple CMOS inputs without buffering. |
| Input Capacitance (Ci) | 4–5 pF - minimizes loading on upstream drivers and preserves signal integrity in dense PCB layouts. |
Pinout & Package
SN74LVC8T245DWRG4 is packaged in a 24-pin SSOP (DB) package measuring 8.2 mm × 7.8 mm with gull-wing leads. Thermal pad is not present; pin 1 is VCCA, pins 11–13 are GND, and pins 23–24 are VCCB.
| 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 valid logic levels at all times to avoid excess ICC/ICCZ. |
| GND (Pins 11–13) | Ground reference | 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; electrically isolated from A-port except through transceiver logic path. |
| OE (Pin 22) | Output enable input | High = both ports in high-impedance; Low = active data transfer per DIR state; referenced to VCCA. |
| VCCB (Pins 23–24) | B-port supply reference | Dual VCCB pins lower impedance and improve decoupling for B-side I/O switching currents. |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail operation | Independent 1.65V–5.5V supplies on VCCA and VCCB allow arbitrary voltage node translation without redesign. |
| VCC isolation & disconnect | Outputs automatically enter high-Z if either VCCA or VCCB drops below 100 mV or floats - prevents bus contention during power sequencing. |
| Ioff partial-power-down support | Enables safe hot-plug or sleep-mode operation by disabling I/Os and limiting leakage to <±2 µA when powered down. |
| Glitch-free power supply sequencing | Eliminates false transitions during asymmetric power-up/down - critical for reliable communication in mixed-rail systems. |
| Robust ESD protection | 4000V HBM and 1000V CDM ratings meet industrial handling and board-level reliability requirements. |
Applications
| Industrial PLC Interface | Flat-Panel Monitor Control |
|---|---|
|
Use Scenario: Interfacing a 3.3V FPGA-based motion controller with legacy 5V I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing data exchange between mismatched voltage domains while maintaining timing integrity under variable load conditions. Use Value: Eliminates need for discrete level-shifters and reduces BOM count; supports hot-swap capability via Ioff and VCC isolation during field maintenance. |
Use Scenario: Connecting a 1.8V video processor to 3.3V display timing controller and backlight driver ICs in sound bar and flat-panel monitor designs. IC Role / Device Role / Timing Role: Synchronous data bridge enabling pixel clock, control, and status signal translation across voltage boundaries without skew or metastability. Use Value: Enables compact, low-power display subsystems with minimal layout area and no external passive components required for level translation. |
| Network Attached Storage | Data Center Switch Backplane |
|
Use Scenario: Linking 2.5V SATA host controllers to 3.3V power management and thermal sensor ICs in NAS enclosures. IC Role / Device Role / Timing Role: Asynchronous bus transceiver supporting command/status handshaking between heterogeneous SoC peripherals and auxiliary ICs. Use Value: Provides deterministic 3-state control and fast propagation delay (≤7.1 ns at 1.8V→3.3V) for responsive system monitoring and fault reporting. |
Use Scenario: Enabling communication between 1.8V baseband processors and 5V PHY interface ICs in telecom baseband units and data center switches. IC Role / Device Role / Timing Role: High-drive (±32 mA) bidirectional translator ensuring signal integrity across long PCB traces and multi-drop backplane segments. Use Value: Delivers robust edge rates into 15 pF loads while maintaining <±2 µA Ioff leakage - critical for thermal management and power budget compliance. |
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 (0.25 ns typical at 1.8V); higher Ioff (±5 µA) | Optimized for ultra-low-voltage mobile interfaces; not suitable for 5V domain translation | Select when translating only between 1.2V–3.3V nodes and sub-ns timing margins are required. |
| TXB0108 | Auto-direction sensing (no DIR pin); supports 1.2V–3.6V translation; higher quiescent current (10 µA typical) | Eliminates direction-control logic but lacks explicit DIR control for synchronous protocols requiring deterministic flow control | Select for simple GPIO expansion where direction is inferred from data activity, not for protocol-aware bidirectional buses. |
Compared with SN74AVC8T245 and TXB0108, the SN74LVC8T245 uniquely supports full 1.65V–5.5V dual-rail operation with explicit DIR control and industry-standard ESD ratings - making it the only option among the three qualified for mixed 5V/3.3V/1.8V industrial backplanes requiring guaranteed glitch-free sequencing.
Availability
SN74LVC8T245DWRG4 is available at Aetrix Electronics and suitable for industrial automation, consumer display interfaces, and network storage systems requiring stable component supply across extended temperature ranges and mixed-voltage architectures.
Supply support for SN74LVC8T245DWRG4 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 for low-voltage, high-speed bidirectional bus interfacing in mixed-supply systems - emphasizing robust power sequencing, wide voltage translation, and industrial reliability.
FAQ
What voltage ranges does the SN74LVC8T245DWRG4 support on its VCCA and VCCB rails?
The SN74LVC8T245DWRG4 supports independent supply voltages from 1.65V to 5.5V on both VCCA and VCCB. This enables bidirectional translation between any combination of standard logic nodes - including 1.8V↔2.5V, 1.8V↔3.3V, 1.8V↔5V, 3.3V↔5V - without external components. Operation outside this range risks damage or undefined behavior.
How does the SN74LVC8T245DWRG4 handle power sequencing when VCCA and VCCB are powered up at different times?
The SN74LVC8T245DWRG4 features glitch-free power supply sequencing: either VCCA or VCCB may be powered on or off in any order without causing erroneous output transitions. If either supply drops below 100 mV or floats, the VCC isolation feature forces all I/Os into high-impedance state - preventing bus contention and protecting downstream devices during asymmetric power events.
What is the function of the DIR and OE pins on the SN74LVC8T245DWRG4, and how are they referenced?
On the SN74LVC8T245DWRG4, DIR controls data direction (high = A→B, low = B→A) and OE enables/disables outputs (low = active, high = high-Z). Both DIR and OE are referenced to VCCA - meaning their VIH/VIL thresholds scale with VCCA voltage, not VCCB. This ensures reliable control even when VCCA and VCCB differ significantly.
Does the SN74LVC8T245DWRG4 support partial-power-down operation, and how is it implemented?
Yes, the SN74LVC8T245DWRG4 supports partial-power-down via its Ioff feature. When either VCCA or VCCB is at 0V, the Ioff circuitry disables all I/O outputs and limits leakage current to <±2 µA - preventing damaging backflow current into powered-down sections of the system. This is essential for hot-plug and low-power standby modes in industrial equipment.
What package type and dimensions does the SN74LVC8T245DWRG4 use, and are there thermal considerations?
The SN74LVC8T245DWRG4 uses a 24-pin SSOP (DB) package measuring 8.2 mm × 7.8 mm. Its junction-to-ambient thermal resistance (RθJA) is 90.7°C/W. For sustained operation near maximum ratings, TI recommends using ≥2x 0.1 µF ceramic bypass capacitors per supply rail and minimizing trace length to GND planes - especially critical when driving ≥24 mA per output at elevated ambient temperatures.
SN74LVC8T245DWRG4 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:
- 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-SOIC
SN74LVC8T245DWRG4 FAQ
1.How can I place an order for SN74LVC8T245DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245DWRG4 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 SN74LVC8T245DWRG4 reliable?
The price and inventory of SN74LVC8T245DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC8T245DWRG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC8T245DWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC8T245DWRG4 transactions.
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SN74LVC8T245DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC8T245DWRG4 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 SN74LVC8T245DWRG4?
For technical support, including SN74LVC8T245DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245DWRG4 requirements.
6.How does Aetrix verify that SN74LVC8T245DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245DWRG4 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 SN74LVC8T245DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245DWRG4?
All SN74LVC8T245DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245DWRG4, 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 SN74LVC8T245DWRG4 part is unused and in its original packaging.
Return procedure for SN74LVC8T245DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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