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Texas Instruments SN74ACT244NE4
- Part No.:
- SN74ACT244NE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ACT244NE4.pdf
- Description:
- 8-CH, 4.5-V TO 5.5-V BUFFERS WIT
- Quantity:
- Payment:
- Shipping:
Inventory:3,396
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Product details
Overview
SN74ACT244NE4 from Texas Instruments is an octal 3-state non-inverting buffer/driver IC designed for bus-oriented data transmission, clock distribution, and memory address driving in industrial and telecom systems. It operates from 4.5 V to 5.5 V, delivers ±24 mA output drive per channel, achieves 9.5 ns maximum propagation delay at 5 V, and features TTL-compatible inputs with 2 V minimum VIH at 5 V VCC.
For engineers reviewing the SN74ACT244NE4 datasheet, SN74ACT244NE4 pinout, SN74ACT244NE4 application, or SN74ACT244NE4 equivalent, key selection criteria include its dual 4-bit architecture with independent active-low output enables (1OE, 2OE), high-impedance state control, 20-pin PDIP package, and compatibility with 5-V logic buses requiring robust drive strength and noise immunity.
Technical Context
The SN74ACT244NE4 implements two independent 4-bit buffer sections (Group 1: A1–A4 → Y1–Y4; Group 2: A1–A4 → Y1–Y4), each controlled by a dedicated active-low output-enable input (1OE, 2OE). When OE is low, data passes non-inverted from A inputs to Y outputs; when OE is high, all corresponding Y outputs enter high-impedance state.
It uses ACT (Advanced CMOS TTL-compatible) logic technology, ensuring compatibility with TTL input thresholds while delivering CMOS-level power efficiency and speed. Input voltage tolerance extends to 5.5 V regardless of VCC, enabling mixed-voltage interfacing without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V supply tolerances and brown-out conditions. |
| Max Propagation Delay | 9.5 ns at 5 V - Enables reliable timing in high-speed bus applications up to ~100 MHz clock domains. |
| Output Drive | ±24 mA per channel - Supports direct LED driving and fan-out to multiple TTL/CMOS loads without external buffers. |
| Input Compatibility | TTL-compatible with VIH ≥ 2 V at 5 V - Interoperates seamlessly with legacy 5-V TTL logic families. |
| Operating Temperature | –40 °C to +85 °C - Qualified for industrial-grade ambient environments without derating. |
| ESD Rating (HBM) | ±3000 V - Provides robust handling margin during PCB assembly and system integration. |
Pinout & Package
SN74ACT244NE4 is housed in a 20-pin plastic dual in-line package (PDIP, N package), with 0.3-inch body width and through-hole mounting. Pin pitch is 0.1 inch; leads are tin-plated, RoHS-compliant, and rated for wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable inputs - Control high-impedance state for respective 4-bit groups independently. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Buffer input terminals - Accept TTL/CMOS logic signals; tolerant to 5.5 V regardless of VCC. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Non-inverting buffered outputs - Deliver full-rail swing and ±24 mA drive capability per channel. |
| 10 | GND | Ground reference - Must be connected to system ground plane for stable logic thresholds and noise immunity. |
| 20 | VCC | Power supply - Requires local 0.1 µF ceramic bypass capacitor placed within 5 mm of pin for switching noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit buffers | Enables selective isolation of two data paths (e.g., address vs. data bus segments) using separate OE controls. |
| 3-State outputs with active-low OE | Allows bidirectional bus sharing without contention; OE tied high disables both groups simultaneously. |
| 5.5-V tolerant inputs | Permits interfacing with higher-voltage peripherals or legacy systems without external level-shifting circuitry. |
| Low propagation delay (9.5 ns max) | Supports timing-critical applications such as synchronous memory addressing and clock buffering with minimal skew. |
| High noise immunity (VIL = 0.8 V, VIH = 2.0 V) | Ensures reliable logic interpretation in electrically noisy industrial environments with marginal signal margins. |
Applications
| LED Display Drivers | Telecom Line Card Interfaces |
|---|---|
Use Scenario: Driving 7-segment or dot-matrix LED displays in industrial HMIs and instrumentation panels. IC Role / Device Role / Timing Role: Non-inverting buffer providing current-sinking capability to LEDs via series resistors, with OE used for multiplexing control. Use Value: Eliminates need for discrete transistor arrays; ±24 mA drive supports common-anode configurations directly from 5-V rails. |
Use Scenario: Isolating and buffering control signals between FPGA-based management processors and line interface units (LIUs) in carrier-grade switches. IC Role / Device Role / Timing Role: Bus driver for status, reset, and configuration lines, with 3-state outputs preventing back-driving during hot-swap events. Use Value: High noise immunity and 9.5 ns delay ensure deterministic signal integrity across dense backplane routing. |
| Memory Address Buffers | Industrial PLC I/O Expansion |
Use Scenario: Buffering address lines from microcontrollers to SRAM or EPROM in embedded controllers with limited drive strength. IC Role / Device Role / Timing Role: Octal non-inverting driver strengthening weak address bus signals before fan-out to multiple memory devices. Use Value: Dual OE pins allow dynamic partitioning of address space - e.g., enabling only upper/lower memory banks on demand. |
Use Scenario: Level-shifting and signal conditioning for digital I/O expansion modules in programmable logic controllers operating in factory-floor environments. IC Role / Device Role / Timing Role: Interface buffer between isolated MCU domain and optocoupled field-side inputs/outputs. Use Value: –40 °C to +85 °C rating and ±3000 V HBM ESD withstand ensure long-term reliability under thermal cycling and electrostatic stress. |
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 |
|---|---|---|---|
| SN74LS244N | Lower drive (±15 mA), slower (tPD ≈ 25 ns), TTL-input-only, 4.75–5.25 V range | Legacy TTL systems where speed and drive are secondary to cost and compatibility | Choose when interfacing exclusively with older LS-TTL logic and lower power consumption is acceptable. |
| SN74LVC244APWR | 3.3-V only (1.65–3.6 V), higher speed (tPD ≈ 4.4 ns), lower drive (±24 mA), different pinout | Modern low-voltage digital systems requiring LVTTL/LVCMOS compatibility | Prefer for new designs targeting 3.3-V domains; requires level translation if interfacing with 5-V buses. |
Compared with SN74LS244N, SN74ACT244NE4 offers 2.6× faster propagation and 60% higher drive strength at identical 5-V operation; compared with SN74LVC244APWR, it maintains full 5-V compatibility but trades off speed for voltage flexibility and legacy interoperability.
Availability
SN74ACT244NE4 is available at Aetrix Electronics and suitable for industrial HMIs, telecom line cards, and PLC I/O expansion requiring stable component supply, long-lifecycle support, and through-hole manufacturability.
Supply support for SN74ACT244NE4 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 logic solutions, with over 50 years of innovation in high-reliability logic families.
The SN74ACT244NE4 belongs to TI's ACT-series advanced CMOS logic family, engineered for industrial and telecom applications demanding TTL compatibility, robust drive strength, and wide supply voltage tolerance in 5-V systems.
FAQ
What is the maximum operating temperature for SN74ACT244NE4?
The SN74ACT244NE4 is rated for operation from –40 °C to +85 °C, meeting industrial temperature requirements. This specification applies specifically to the NE4 variant in the PDIP package, as confirmed in TI's SCAS517G datasheet Section 5.3. Thermal derating is not required within this range, and the device maintains full electrical performance across the entire span.
Does SN74ACT244NE4 support 5-V tolerant inputs?
Yes, SN74ACT244NE4 inputs accept voltages up to 5.5 V regardless of VCC level, as stated in Section 1 Features and verified in Section 5.1 Absolute Maximum Ratings. This allows safe interfacing with 5-V signals even when VCC is at nominal 4.5 V, eliminating need for external clamping or level-shifting circuitry.
Can SN74ACT244NE4 drive LEDs directly?
Yes, SN74ACT244NE4 can drive LEDs directly in sink or source configurations, as confirmed in Section 8.1 Application Information. Each output supports ±24 mA, and typical LED drive uses current-limiting resistors (e.g., 1 kΩ at 5 V yields <5 mA), staying well within the device's specified IOL/IOH limits and thermal limits.
What is the pin count and package type of SN74ACT244NE4?
SN74ACT244NE4 uses a 20-pin plastic dual in-line package (PDIP), designated as "N" in TI's packaging nomenclature. This through-hole package has 0.3-inch body width, 0.1-inch lead pitch, and is RoHS-compliant with NIPDAU lead finish, as documented in the PACKAGE OPTION ADDENDUM.
How does the output-enable logic work on SN74ACT244NE4?
SN74ACT244NE4 features two active-low output-enable inputs: 1OE (Pin 1) controls Group 1 outputs (1Y1–1Y4), and 2OE (Pin 19) controls Group 2 outputs (2Y1–2Y4). When either OE is low, its associated Y outputs follow A inputs non-invertingly; when high, those outputs enter high-impedance state - enabling bus sharing and dynamic segmentation.
SN74ACT244NE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ACT244NE4 FAQ
1.How can I place an order for SN74ACT244NE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244NE4 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 SN74ACT244NE4 reliable?
The price and inventory of SN74ACT244NE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244NE4 is usually 5 days.
3.What payment methods are accepted for SN74ACT244NE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244NE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244NE4?
SN74ACT244NE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244NE4 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 SN74ACT244NE4?
For technical support, including SN74ACT244NE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244NE4 requirements.
6.How does Aetrix verify that SN74ACT244NE4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT244NE4 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 SN74ACT244NE4 meets industry standards.
7.What is the process for return or replacement of SN74ACT244NE4?
All SN74ACT244NE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244NE4, 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 SN74ACT244NE4 part is unused and in its original packaging.
Return procedure for SN74ACT244NE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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