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Texas Instruments SN74ACT244DWE4
- Part No.:
- SN74ACT244DWE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ACT244DWE4.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,845
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Product details
Overview
SN74ACT244DWE4 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 5-V TTL-compatible 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 supports TTL-level inputs with VIH ≥ 2.0 V and VIL ≤ 0.8 V - enabling direct interface with legacy TTL logic in server backplanes and telecom switching networks.
For engineers reviewing the SN74ACT244DWE4 datasheet, SN74ACT244DWE4 pinout, SN74ACT244DWE4 application, or SN74ACT244DWE4 equivalent, key selection criteria include its dual 4-bit independent 3-state architecture with separate active-low OE inputs, guaranteed high-impedance outputs during power-up/down when OE is pulled high, and SOIC-20 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The SN74ACT244DWE4 implements two independent 4-bit buffer sections, each controlled by its own active-low output-enable (OE) input. 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 - enabling bidirectional bus control without external direction logic.
Its ACT (Advanced CMOS TTL-compatible) process ensures rail-to-rail input voltage tolerance up to 5.5 V, robust ESD protection (±3000 V HBM), and stable operation across –40°C to +85°C. The device exhibits 2.5 pF typical input capacitance and 8 pF typical output capacitance, supporting clean signal integrity in high-speed digital interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of supply ripple within specification limits |
| Max Propagation Delay | 9.5 ns at 5 V - enables reliable operation in systems requiring sub-10-ns timing margins for address/data buffering |
| Output Drive | ±24 mA per channel - sufficient to directly drive LEDs, terminated transmission lines, or multiple TTL loads without external buffers |
| Input Compatibility | TTL-compatible with VIH ≥ 2.0 V, VIL ≤ 0.8 V at 5 V - allows seamless integration with legacy 74LS/74F logic families |
| 3-State Enable Logic | Active-low OE with high-impedance output when high - supports hot-swap bus arbitration and multi-master contention management |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems including telecom infrastructure and industrial controllers |
| ESD Rating | ±3000 V HBM - meets JEDEC JS-001 requirements for handling in standard manufacturing environments |
Pinout & Package
SN74ACT244DWE4 is packaged in a 20-pin SOIC (DW) body measuring 12.8 mm × 7.5 mm × 2.35 mm, with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable inputs controlling respective 4-bit sections - must be pulled high via resistor for safe power-up high-Z state |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Non-inverting data inputs - accept TTL-compatible signals up to 5.5 V regardless of VCC |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Non-inverting buffered outputs - drive loads up to ±24 mA while maintaining VOH ≥ 3.76 V / VOL ≤ 0.44 V at 5 V |
| 10 | GND | Ground reference - requires low-inductance connection to system ground plane for noise immunity |
| 20 | VCC | Positive supply - requires local 0.1 µF ceramic bypass capacitor placed adjacent to pin for stable switching performance |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual 4-bit sections | Enables simultaneous control of two separate 4-bit buses (e.g., address and data) using distinct OE signals |
| High-impedance output on OE high | Prevents bus contention during power sequencing or system reset without external pull-up/pull-down networks |
| TTL-compatible input thresholds | Eliminates need for level-shifting circuitry when interfacing with 74LS, 74F, or microcontroller GPIOs operating at 5 V |
| Low dynamic power consumption | ICC = 4 µA typical at 5.5 V - reduces standby current in always-on subsystems such as telecom line cards |
| Robust thermal design | RθJA = 101.2 °C/W (SOIC-20) - supports continuous operation at full drive strength without forced airflow |
Applications
| LED Display Drivers | Telecom Switching Networks |
|---|---|
Use Scenario: Driving 7-segment or dot-matrix LED displays in industrial HMIs and network equipment front panels. IC Role / Device Role / Timing Role: Acts as current-sinking or current-sourcing buffer between microcontroller GPIOs and LED segments, with OE used for multiplexing control. Use Value: Delivers ±24 mA per channel to illuminate LEDs directly with minimal external components, reducing BOM count and PCB area. |
Use Scenario: Isolating and buffering control signals between FPGA-based switch fabric controllers and peripheral interface ICs in carrier-grade routers. IC Role / Device Role / Timing Role: Functions as a timing-critical bus driver for address/data latching in high-density backplane interconnects. Use Value: Sub-10 ns propagation delay ensures setup/hold timing compliance across 20+ inch PCB traces at 25 MHz clock rates. |
| Memory Address Buffers | Industrial Bus Transceivers |
Use Scenario: Strengthening and distributing memory address lines from microprocessor to SRAM/Flash arrays in programmable logic controllers. IC Role / Device Role / Timing Role: Serves as non-inverting address driver with 3-state capability to support shared memory access across multiple masters. Use Value: Dual OE inputs allow independent gating of upper/lower address nibbles, simplifying memory bank selection logic. |
Use Scenario: Enabling bidirectional data flow on RS-485 or CAN transceiver control buses in factory automation I/O modules. IC Role / Device Role / Timing Role: Provides direction-controlled signal conditioning between MCU UART pins and transceiver enable lines. Use Value: Guaranteed high-impedance state prevents signal corruption during transceiver mode transitions, improving communication reliability. |
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 |
|---|---|---|---|
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V), CMOS input thresholds, 32 mA drive, 3.3-V only operation | Requires level translation for 5-V systems; unsuitable for direct TTL interface or mixed-voltage backplanes | Select when migrating to 3.3-V logic domains with modern FPGAs or ARM-based controllers |
| 74ACT244SCX | Same ACT family, identical electrical specs, but in SOIC-20 package with different marking and tape/reel packaging | No functional or timing difference; differs only in manufacturer branding and logistics packaging | Acceptable drop-in replacement if sourcing flexibility or alternate distributor availability is required |
Compared with SN74LVC244APWR, SN74ACT244DWE4 provides native 5-V TTL compatibility and higher noise immunity; compared with 74ACT244SCX, it offers identical functionality with TI-specific traceability and quality documentation for industrial OEM programs.
Availability
SN74ACT244DWE4 is available at Aetrix Electronics and suitable for industrial control systems, telecom infrastructure hardware, and embedded instrumentation requiring stable component supply over extended production lifecycles.
Supply support for SN74ACT244DWE4 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 for industrial, automotive, and communications markets.
SN74ACT244DWE4 belongs to TI's legacy ACT logic family, engineered for high-speed, low-noise 5-V digital interfacing in mission-critical infrastructure where reliability and long-term availability are essential.
FAQ
What is the operating voltage range for SN74ACT244DWE4?
The SN74ACT244DWE4 operates from 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V power supplies while accommodating typical tolerances and ripple. Operation outside this range may cause undefined behavior or damage, and the device is not rated for 3.3-V or mixed-voltage operation without level shifting.
Does SN74ACT244DWE4 support TTL-level inputs?
Yes, SN74ACT244DWE4 accepts TTL-compatible inputs: VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 5 V. Its inputs tolerate voltages up to 5.5 V regardless of supply, allowing direct connection to legacy 74LS or 74F outputs without clamping diodes or resistive dividers.
How does the 3-state output control work on SN74ACT244DWE4?
SN74ACT244DWE4 uses two active-low output-enable inputs (1OE and 2OE). When either OE is low, its associated four outputs pass non-inverted data from A to Y; when high, those outputs enter high-impedance state. This enables independent bus control for two 4-bit channels without external logic.
What is the maximum output current per channel for SN74ACT244DWE4?
SN74ACT244DWE4 delivers ±24 mA per output channel under recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to +85°C). This rating applies continuously and supports direct LED driving or termination of unterminated transmission lines in industrial backplanes.
Is SN74ACT244DWE4 suitable for industrial temperature applications?
Yes, SN74ACT244DWE4 is specified for operation from –40°C to +85°C and is widely deployed in industrial control, telecom, and instrumentation systems. Its SOIC-20 package and ACT process ensure stable parametric performance across this full industrial temperature range.
SN74ACT244DWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ACT244DWE4 FAQ
1.How can I place an order for SN74ACT244DWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244DWE4 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 SN74ACT244DWE4 reliable?
The price and inventory of SN74ACT244DWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244DWE4 is usually 5 days.
3.What payment methods are accepted for SN74ACT244DWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244DWE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244DWE4?
SN74ACT244DWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244DWE4 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 SN74ACT244DWE4?
For technical support, including SN74ACT244DWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244DWE4 requirements.
6.How does Aetrix verify that SN74ACT244DWE4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT244DWE4 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 SN74ACT244DWE4 meets industry standards.
7.What is the process for return or replacement of SN74ACT244DWE4?
All SN74ACT244DWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244DWE4, 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 SN74ACT244DWE4 part is unused and in its original packaging.
Return procedure for SN74ACT244DWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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