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Texas Instruments SN74ACT244DWRE4
- Part No.:
- SN74ACT244DWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ACT244DWRE4.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,072
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Product details
Overview
SN74ACT244DWRE4 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 digital systems. It features dual 4-bit channels with independent active-low output-enable inputs, 4.5–5.5-V operation, TTL-compatible inputs, and 9.5-ns maximum propagation delay at 5 V.
For engineers reviewing the SN74ACT244DWRE4 datasheet, SN74ACT244DWRE4 pinout, SN74ACT244DWRE4 application, or SN74ACT244DWRE4 equivalent, key selection criteria include 24-mA output drive capability per channel, high-impedance state control timing (tPZH/tPLZ ≤ 9.5 ns), SOIC-20 package compatibility, and industrial temperature range (–40°C to +85°C) support.
Technical Context
The SN74ACT244DWRE4 implements two independent 4-bit non-inverting buffer sections, each controlled by a dedicated active-low output-enable (OE) input. Its logic function is strictly non-inverting: when OE is low, Y = A; when OE is high, outputs enter high-impedance state. No internal latching or inversion occurs.
It operates within strict 4.5–5.5-V VCC limits and supports TTL-level input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V at 5 V). Input voltage tolerance extends to 5.5 V, but inputs are not overvoltage tolerant beyond VCC - they must be clamped to rail.
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 margins |
| Max Propagation Delay | 9.5 ns at 5 V - enables reliable timing in high-speed bus interfaces up to ~100 MHz clock domains |
| Output Drive | ±24 mA per channel - sufficient to directly drive LEDs, TTL loads, or short PCB traces without external buffers |
| Input Compatibility | TTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V) - interoperable with legacy 74LS/74F logic families |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment |
| ESD Rating (HBM) | ±3000 V - meets JEDEC JS-001 Class 2 for robust handling in automated assembly environments |
| Quiescent Current | 4 µA at 5.5 V - negligible static power draw during standby or high-Z states |
Pinout & Package
SN74ACT244DWRE4 is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm pitch, RoHS-compliant matte tin lead finish, MSL Level-1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Channel 1 (pins 2–9) and Channel 2 (pins 11–18); tie high for disable, low for pass-through |
| 2, 4, 6, 8 | 1A1–1A4 | Non-inverting input signals for first 4-bit buffer group; routed to pins 18, 16, 14, 12 respectively |
| 11, 13, 15, 17 | 2A1–2A4 | Non-inverting input signals for second 4-bit buffer group; routed to pins 3, 5, 7, 9 respectively |
| 12, 14, 16, 18 | 1Y1–1Y4 | Outputs of first buffer group; driven only when 1OE = low; high-Z otherwise |
| 3, 5, 7, 9 | 2Y1–2Y4 | Outputs of second buffer group; driven only when 2OE = low; high-Z otherwise |
| 10 | GND | Ground reference for all logic and output stages; requires low-inductance connection to system ground plane |
| 20 | VCC | Primary power supply (4.5–5.5 V); requires local 0.1-µF ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-channel OE control | Enables selective isolation of two 4-bit data paths without shared enable timing constraints |
| 24-mA sink/source per output | Supports direct LED driving with series resistors or fan-out to ≥10 TTL loads |
| 9.5-ns max tPD at 5 V | Meets setup/hold timing for 50-MHz synchronous buses with margin |
| TTL-compatible input thresholds | Guarantees interoperability with legacy 74LS, 74F, and microcontroller GPIOs without level-shifting |
| High-impedance state on power-up | OE pins default inactive (high) at power-on, preventing bus contention during initialization |
Applications
| LED Display Drivers | Memory Address Buffers |
|---|---|
Use Scenario: Driving common-anode or common-cathode 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 (for common-anode) or current-sourcing (for common-cathode) capability per segment, controlled via discrete OE lines. Use Value: Eliminates need for discrete transistors; 24-mA per output supports bright LED visibility while maintaining thermal safety in SOIC package. | Use Scenario: Isolating and strengthening address lines between microcontrollers and parallel SRAM or Flash memory in embedded controllers. IC Role / Device Role / Timing Role: Bidirectional-capable buffer (used unidirectionally) that drives capacitive address bus loads while preventing back-driving during memory read cycles. Use Value: 9.5-ns propagation delay ensures address setup time compliance for 100-ns access memory; high-Z state prevents contention during bus arbitration. |
| Telecom Switching Networks | Industrial Bus Transceivers |
Use Scenario: Signal conditioning and isolation of control lines in TDM switching matrices and line-card interface modules. IC Role / Device Role / Timing Role: Octal buffer used to regenerate and isolate clock, frame-sync, and channel-select signals across backplane segments. Use Value: Dual OE inputs allow synchronized enable/disable of two independent signal groups, reducing skew-induced jitter in time-critical telecom timing paths. | Use Scenario: Interfacing microcontroller GPIOs to industrial fieldbus nodes (e.g., Modbus RTU, CAN physical layer control lines) requiring robust 5-V logic translation. IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening buffer for control/status signals between isolated MCU domains and bus transceivers. Use Value: ±3000-V HBM ESD rating ensures reliability in electrically noisy factory-floor environments; SOIC-20 footprint simplifies layout in space-constrained PLC I/O modules. |
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 | 3.3-V only (1.65–3.6 V), lower drive (24 mA sink, 24 mA source), smaller TSSOP-20 package | Requires level-shifting for 5-V systems; unsuitable for direct replacement in legacy 5-V designs | Select only if migrating to 3.3-V logic; verify VCC compatibility and timing margins |
| SN74HC244N | Slower (28-ns max tPD), lower drive (±7.8 mA), same SOIC-20 package and pinout | Acceptable for low-speed bus buffering where timing margin >20 ns exists | Use where cost sensitivity outweighs speed requirements; confirm fan-out and noise immunity meet system needs |
Compared with SN74LVC244APWR and SN74HC244N, SN74ACT244DWRE4 delivers superior speed and 5-V compatibility - critical for maintaining signal integrity in legacy industrial and telecom infrastructure where mixed-voltage interoperation and tight timing budgets are mandatory.
Availability
SN74ACT244DWRE4 is available at Aetrix Electronics and suitable for industrial HMIs, telecom switching modules, and embedded memory subsystems requiring stable component supply, long-lifecycle support, and guaranteed SOIC-20 packaging.
Supply support for SN74ACT244DWRE4 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 and embedded processing solutions, with decades of expertise in logic IC design, manufacturing, and automotive/industrial qualification.
The SN74ACT244 family was engineered for high-density, high-drive 3-state bus interfacing in 5-V systems - targeting memory subsystems, clock distribution networks, and industrial control backplanes where timing precision and load driving capability are critical.
FAQ
What is the maximum operating voltage for SN74ACT244DWRE4?
The SN74ACT244DWRE4 has an absolute maximum VCC rating of 7 V, but its recommended operating range is strictly 4.5 V to 5.5 V. Operation outside this window risks parametric failure or reduced reliability. The device is not rated for 3.3-V operation, and applying VCC < 4.5 V may cause VIH/VIL threshold violations and unpredictable output behavior. Always maintain VCC within spec for guaranteed SN74ACT244DWRE4 functionality.
Does SN74ACT244DWRE4 support hot-swap or live-insertion?
No, SN74ACT244DWRE4 does not support hot-swap. Its inputs are not overvoltage tolerant beyond VCC, and no built-in power sequencing or bus-fault protection is provided. Applying signals before VCC stabilization or during partial power-up can cause latch-up or excessive ICC. For hot-swap applications, external protection circuitry (e.g., series resistors, TVS diodes) and controlled power-rail ramping are required to ensure safe SN74ACT244DWRE4 operation.
Can SN74ACT244DWRE4 drive LEDs directly?
Yes, SN74ACT244DWRE4 can drive LEDs directly using appropriate current-limiting resistors. With ±24-mA output capability per channel and VOL ≤ 0.44 V at 24 mA (5.5 V VCC), it supports common-cathode (sink) or common-anode (source) configurations. A 1-kΩ resistor at 5 V yields ~5 mA per LED - well within SN74ACT244DWRE4's ratings and typical LED forward-current specs. Avoid exceeding 24 mA per output or 200 mA total package current.
What is the thermal resistance (RθJA) of SN74ACT244DWRE4 in its SOIC-20 package?
The junction-to-ambient thermal resistance (RθJA) for SN74ACT244DWRE4 in the SOIC-20 (DW) package is 101.2°C/W, measured under standard JEDEC JESD51-2 conditions (single-layer board, 1-in² copper pad). This value assumes proper PCB layout with adequate copper pour and thermal vias. At full 200-mA package current and 5.5-V VCC, junction temperature rise would be ~20°C above ambient - well within the 150°C absolute maximum TJ limit. Always verify actual board-level thermal performance for SN74ACT244DWRE4 in high-power-density layouts.
How should unused inputs be handled on SN74ACT244DWRE4?
All unused inputs on SN74ACT244DWRE4 must be tied to either VCC or GND - never left floating. Floating CMOS inputs cause increased ICC, noise susceptibility, and potential oscillation due to undefined threshold crossing. For OE inputs, tie to VCC (via pullup) to ensure outputs remain in high-Z state by default. For A inputs, tie to GND or VCC depending on desired default output state. TI's application report "Implications of Slow or Floating CMOS Inputs" provides detailed guidance for SN74ACT244DWRE4 system-level implementation.
SN74ACT244DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ACT244DWRE4 FAQ
1.How can I place an order for SN74ACT244DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244DWRE4 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 SN74ACT244DWRE4 reliable?
The price and inventory of SN74ACT244DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244DWRE4 is usually 5 days.
3.What payment methods are accepted for SN74ACT244DWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244DWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244DWRE4?
SN74ACT244DWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244DWRE4 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 SN74ACT244DWRE4?
For technical support, including SN74ACT244DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244DWRE4 requirements.
6.How does Aetrix verify that SN74ACT244DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT244DWRE4 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 SN74ACT244DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74ACT244DWRE4?
All SN74ACT244DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244DWRE4, 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 SN74ACT244DWRE4 part is unused and in its original packaging.
Return procedure for SN74ACT244DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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