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Texas Instruments SN74LVC244ADWRE4
- Part No.:
- SN74LVC244ADWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC244ADWRE4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,941
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Product details
Overview
SN74LVC244ADWRE4 from Texas Instruments is an octal 3-state buffer/driver IC designed for asynchronous bus interfacing in 1.65V–3.6V systems. It features dual 4-bit banks, 5.9ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and Ioff support for live insertion-used in server backplanes, LED display drivers, and telecom switch control paths.
For engineers reviewing the SN74LVC244ADWRE4 datasheet, SN74LVC244ADWRE4 pinout, SN74LVC244ADWRE4 application, or SN74LVC244ADWRE4 equivalent, this page delivers verified electrical specs, SOIC-20 package details, functional mode behavior, real-world signal integrity guidance, and validated alternative options for industrial and communications designs.
Technical Context
The SN74LVC244ADWRE4 implements two independent 4-bit noninverting buffers with separate 3-state output enables (1OE, 2OE), each controlling four outputs (1Y1–1Y4, 2Y1–2Y4). Its CMOS architecture supports mixed-mode signaling: 5.5V inputs are safely translated down to VCC-level outputs without level shifters.
It integrates partial-power-down protection (Ioff) that disables all outputs when VCC = 0V, preventing back-drive and enabling hot-swap capability. Output ground bounce (VOLP < 0.8V) and undershoot (VOHV > 2V) are characterized at 3.3V/25°C, confirming robust signal integrity for high-speed PCB traces up to 12 cm.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables direct interface with 1.8V, 2.5V, and 3.3V logic domains without external regulators. |
| Input Voltage Tolerance | Up to 5.5V - Allows connection to legacy 5V buses or microcontroller GPIOs without clamping diodes or resistors. |
| tpd (Max) | 5.9ns at 3.3V - Supports >100MHz data rates on short traces; critical for timing-critical bus buffering in network switches. |
| Ioff Leakage | ±10µA at VCC = 0V - Ensures safe live insertion into powered-backplane systems without disrupting adjacent circuitry. |
| Output Drive | ±24mA at 3.0V - Drives 50Ω transmission lines or multiple CMOS loads; sufficient for LED column drivers in 16×16 displays. |
| Operating Temp | –40°C to +125°C - Qualified for under-hood automotive modules and industrial motor drive controllers. |
| ESD Rating | ±2000V HBM - Meets IEC 61000-4-2 Level 2 for board-level ESD immunity in telecom infrastructure equipment. |
Pinout & Package
SN74LVC244ADWRE4 uses a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm body size, with gull-wing leads optimized for automated assembly and thermal dissipation (RθJA = 114.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Input (8 total) | Noninverting data inputs for two independent 4-bit banks; accept 0–5.5V regardless of VCC. |
| 1Y1–1Y4, 2Y1–2Y4 | Output (8 total) | 3-state buffered outputs; high-impedance when corresponding OE is high; drive ±24mA at 3V. |
| 1OE, 2OE | Active-Low Enable (2) | Each controls one bank's outputs; low = enabled, high = high-Z; supports independent bus arbitration. |
| VCC | Power Supply | 1.65–3.6V supply; requires local 0.1µF bypass capacitor placed adjacent to pin 20 per layout guidelines. |
| GND | Ground Reference | Pin 10 serves as primary return path; must connect to solid ground plane to minimize VOLP and crosstalk. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage translation | 5.5V-tolerant inputs enable direct interfacing between 5V controllers and 3.3V system buses without external level shifters. |
| Live-insertion support | Ioff functionality isolates outputs during power-off, allowing safe replacement in hot-swappable server modules. |
| Low ground bounce | VOLP < 0.8V at 3.3V ensures stable reference for downstream receivers, reducing false triggering in LED display columns. |
| Fast edge control | 5.9ns tpd and balanced drive reduce signal distortion on 12cm PCB traces-validated in TI's Figure 8-2 damping analysis. |
| High-impedance isolation | Outputs enter true high-Z state (IOZ ≤ ±20µA) when disabled, eliminating bus contention in multi-master I/O expander applications. |
Applications
| Server Backplane Buffering | LED Display Column Driver |
|---|---|
|
Use Scenario: Isolating CPU address/data buses from expansion slot peripherals in rack-mounted servers. IC Role / Device Role / Timing Role: Octal buffer providing direction-controlled, 3-state isolation between host and add-in cards during hot-plug events. Use Value: Ioff prevents back-drive damage during card insertion; 5.5V input tolerance accepts legacy BIOS signals while driving 3.3V FPGA interfaces. |
Use Scenario: Driving 16-column segments of monochrome LED matrix displays in industrial HMIs. IC Role / Device Role / Timing Role: High-current buffer translating microcontroller GPIOs to sink 20mA per LED column via 1Y1–1Y4 outputs. Use Value: ±24mA drive at 3V eliminates need for discrete transistor arrays; fast tpd ensures flicker-free 1kHz refresh rates. |
| Telecom Switch Control | Industrial I/O Expander Interface |
|
Use Scenario: Enabling/disabling signal paths between line cards and switching fabric in carrier-grade Ethernet switches. IC Role / Device Role / Timing Role: Dual-bank buffer with independent OE pins allows time-multiplexed access to shared backplane resources. Use Value: Separate 1OE/2OE control enables glitch-free bus arbitration; 125°C rating sustains operation in sealed telecom chassis. |
Use Scenario: Interfacing microcontroller GPIOs to remote digital I/O modules over long PCB traces in PLC base units. IC Role / Device Role / Timing Role: Signal conditioner and driver extending noise-immune digital control to field actuators up to 12cm away. Use Value: Low VOLP and controlled edge rates suppress ringing on unterminated traces; 5.5V input tolerance accommodates sensor alarm signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC244APWRE4 | TSSOP-20 package (6.5mm × 6.4mm); 120.3°C/W RθJA vs. SOIC's 114.8°C/W; identical electrical specs. | Better suited for space-constrained telecom modules where board area is limited but thermal margin remains acceptable. | Select when footprint reduction outweighs thermal derating needs; verify trace width and copper pour for thermal management. |
| SN74LVCH244AQPWRQ1 | AEC-Q100 Grade 1 automotive qualification; same pinout and logic, but extended –40°C to +125°C operation with enhanced ESD (±4kV HBM). | Required for engine control units or ADAS domain controllers where automotive reliability and temperature range exceed industrial requirements. | Choose only for automotive production; not drop-in compatible due to different qualification testing and documentation traceability. |
Compared with SN74LVC244ADWRE4, the TSSOP variant saves board area but sacrifices ~5% thermal performance, while the automotive-grade version adds qualification overhead and cost without improving raw speed or drive strength-making the SOIC version optimal for cost-sensitive industrial and telecom designs.
Availability
SN74LVC244ADWRE4 is available at Aetrix Electronics and suitable for server backplane buffering, LED display column driving, and telecom switch control requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for SN74LVC244ADWRE4 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 and embedded processing solutions, with over 50 years of innovation in logic, power management, and signal chain technologies.
The SN74LVC244ADWRE4 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for high-speed, low-power bus interfacing in mixed-voltage systems-from industrial automation to enterprise networking equipment.
FAQ
What is the maximum input voltage the SN74LVC244ADWRE4 can tolerate?
The SN74LVC244ADWRE4 accepts input voltages up to 5.5V regardless of VCC level-enabling direct connection to 5V microcontrollers or legacy peripherals without external level-shifting components. This overvoltage tolerance is specified across the full operating temperature range and is implemented via internal clamp diodes referenced to VCC and GND.
Does the SN74LVC244ADWRE4 support hot-swap or live-insertion applications?
Yes, the SN74LVC244ADWRE4 supports live insertion through its Ioff feature: when VCC = 0V, all outputs enter high-impedance state with leakage current limited to ±10µA, preventing back-drive into powered systems. This makes SN74LVC244ADWRE4 suitable for modular server backplanes and field-replaceable telecom line cards.
What is the propagation delay of the SN74LVC244ADWRE4 at 3.3V operation?
The SN74LVC244ADWRE4 has a maximum propagation delay (tpd) of 5.9ns at VCC = 3.3V and TA = 25°C, with typical values as low as 3.9ns. This delay is measured from input transition to output transition under 50pF load and confirms suitability for sub-100MHz digital bus applications such as memory-mapped I/O expansion.
Can the SN74LVC244ADWRE4 drive LEDs directly?
Yes-the SN74LVC244ADWRE4 can sink or source up to ±24mA per output at VCC = 3.0V, sufficient to drive standard 20mA LEDs in common-anode or common-cathode configurations. For reliable operation, ensure current-limiting resistors are used and total device current stays within ±100mA continuous limit across VCC/GND pins.
What package type does the SN74LVC244ADWRE4 use, and what are its key mechanical dimensions?
The SN74LVC244ADWRE4 uses a 20-pin SOIC (DW) package with body dimensions of 12.80mm × 10.3mm and overall footprint including leads of 12.80mm × 10.3mm. Its gull-wing lead form supports standard reflow soldering, and thermal resistance is characterized at RθJA = 114.8°C/W for PCBs with 1-inch² 2-oz copper pad.
SN74LVC244ADWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LVC244ADWRE4 FAQ
1.How can I place an order for SN74LVC244ADWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC244ADWRE4 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 SN74LVC244ADWRE4 reliable?
The price and inventory of SN74LVC244ADWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC244ADWRE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC244ADWRE4?
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4.How is shipping managed for SN74LVC244ADWRE4?
SN74LVC244ADWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC244ADWRE4 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 SN74LVC244ADWRE4?
For technical support, including SN74LVC244ADWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC244ADWRE4 requirements.
6.How does Aetrix verify that SN74LVC244ADWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC244ADWRE4 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 SN74LVC244ADWRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC244ADWRE4?
All SN74LVC244ADWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC244ADWRE4, 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 SN74LVC244ADWRE4 part is unused and in its original packaging.
Return procedure for SN74LVC244ADWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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