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Texas Instruments SN74ACT244DW
- Part No.:
- SN74ACT244DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ACT244DW.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,718
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Product details
Overview
SN74ACT244DW 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 industrial temperature range (–40°C to +85°C). It is used in LED display drivers and telecom switching networks where high-current buffering with independent output-enable control is required.
For engineers reviewing the SN74ACT244DW datasheet, SN74ACT244DW pinout, SN74ACT244DW application, or SN74ACT244DW equivalent, this page provides verified technical context, package-specific pin functions, real-world application implementation details, and validated alternative options for system-level design continuity and supply chain resilience.
Technical Context
The SN74ACT244DW implements two independent 4-bit buffer sections, each with dedicated active-low output-enable (OE) inputs (Pin 1 and Pin 19), enabling selective 3-state control of Y outputs without affecting the other section. Its ACT logic family ensures TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max at 5 V) and rail-to-rail output swing under load.
Each buffer stage drives up to 24 mA low or –24 mA high while maintaining VOL ≤ 0.44 V and VOH ≥ 3.76 V at 4.5 V VCC, supporting robust noise margins in noisy industrial environments. The device features 8 pF typical output capacitance and 45 pF power-dissipation capacitance per buffer, optimized for high-speed digital interfacing with minimal signal degradation.
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 100+ MHz bus systems with sufficient setup/hold margin. |
| Output Drive Strength | ±24 mA per channel - Sufficient to directly drive LEDs or interface with multiple TTL loads without external buffers. |
| Input Compatibility | TTL-compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) - Allows seamless integration with legacy 5-V logic families without level-shifting. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and telecom equipment deployment. |
| ESD Rating (HBM) | ±3000 V - Meets IEC 61000-4-2 Level 3 for robust handling in manufacturing and field service. |
| Quiescent Current | 4 µA at 5.5 V - Minimizes standby power in always-on control subsystems. |
Pinout & Package
SN74ACT244DW is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package (DW suffix), 7.5 mm × 12.8 mm body, 1.27 mm pitch, surface-mount compatible with standard reflow profiles (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable inputs - Independently disable Group 1 (Pins 2–9) or Group 2 (Pins 11–18) outputs to high-impedance state. |
| 2, 4, 6, 8 | 1A1–1A4 | Group 1 input pins - Accept TTL-level signals for non-inverting buffering to corresponding Y outputs. |
| 3, 5, 7, 9 | 2Y4–2Y1 | Group 2 output pins - Deliver buffered, non-inverted copies of 2A inputs when 2OE is low. |
| 10 | GND | Ground reference - Must be connected to system ground plane for stable logic thresholds and noise immunity. |
| 11, 13, 15, 17 | 2A1–2A4 | Group 2 input pins - Drive corresponding 2Y outputs (Pins 3,5,7,9) when 2OE is asserted low. |
| 12, 14, 16, 18 | 1Y1–1Y4 | Group 1 output pins - Provide buffered, non-inverted outputs for 1A inputs (Pins 2,4,6,8) when 1OE is low. |
| 20 | VCC | Positive supply - Requires local 0.1-µF ceramic bypass capacitor placed within 5 mm of pin for stable high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual 4-bit enable control | Two separate OE inputs allow granular bus segmentation-e.g., isolate memory address vs. data paths without shared control logic. |
| High-current 3-state outputs | ±24 mA drive per output enables direct LED sinking or sourcing (with current-limiting resistors), eliminating discrete driver stages. |
| TTL-compatible input thresholds | VIH = 2.0 V min and VIL = 0.8 V max at 5 V ensure interoperability with legacy 74LS/74F logic without level translation. |
| Low propagation delay variation | tpd = 6.5 ns typical (5 V) with <3 ns skew between channels - critical for synchronous bus timing integrity in parallel interfaces. |
| Robust ESD protection | HBM rating of ±3000 V reduces risk of assembly-line damage and improves field reliability in unshielded enclosures. |
Applications
| LED Display Driver | Telecom Switching Network |
|---|---|
|
Use Scenario: Driving 7-segment or dot-matrix LED displays in industrial HMIs and network management panels. IC Role / Device Role / Timing Role: Acts as current-sinking buffer between microcontroller GPIO and common-anode LED segments. Use Value: Delivers 24 mA per segment without external transistors, simplifying BOM and reducing PCB area versus discrete solutions. |
Use Scenario: Isolating and buffering control signals between line cards and backplane controllers in modular telecom switches. IC Role / Device Role / Timing Role: Provides bidirectional 3-state bus isolation for address/data lines during hot-swap events. Use Value: Prevents signal contention during card insertion/removal via independent OE control, ensuring system-level fault tolerance. |
| Memory Address Buffer | Industrial Clock Distribution |
|
Use Scenario: Strengthening and fan-out of microprocessor address bus signals to multiple SRAM or flash devices on a dense PCB. IC Role / Device Role / Timing Role: Non-inverting buffer with low skew and fast tpd ensures simultaneous arrival of address bits across memory chips. Use Value: Eliminates timing violations caused by capacitive loading on long traces, enabling reliable operation at >20 MHz bus speeds. |
Use Scenario: Distributing a master clock signal to multiple FPGA configuration peripherals or ADC sampling clocks in test equipment. IC Role / Device Role / Timing Role: Low-jitter, high-drive clock buffer with 3-state capability for dynamic clock gating. Use Value: Maintains signal integrity over 10+ cm trace lengths while allowing software-controlled clock shutdown to reduce system power. |
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), higher speed (tPD = 5.5 ns typ), CMOS input thresholds. | Requires level-shifting for 5-V systems; suited for mixed-voltage designs with 3.3-V FPGAs or MCUs. | Select when migrating to 3.3-V logic domains or needing lower power and faster switching than ACT technology. |
| 74AC244N | Same 5-V operation, identical pinout, but AC family has slightly higher ICC (20 µA vs. 4 µA) and lower ESD (±2000 V HBM). | No functional change in 5-V bus buffering; suitable for cost-sensitive industrial designs where ultra-low quiescent current is not critical. | Choose for legacy compatibility where SN74ACT244DW is unavailable, accepting minor trade-offs in power and ESD robustness. |
Compared with SN74LVC244APWR and 74AC244N, the SN74ACT244DW uniquely balances 5-V TTL compatibility, industrial temperature range, ±3000-V HBM ESD rating, and ultra-low 4-µA standby current-making it optimal for legacy-reliant, noise-prone, and power-constrained 5-V systems.
Availability
SN74ACT244DW is available at Aetrix Electronics and suitable for LED display drivers, telecom switching networks, and industrial memory address buffering requiring stable component supply and long-term production support.
Supply support for SN74ACT244DW 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 ICs, with decades of heritage in industry-standard logic families.
The SN74ACT244DW belongs to TI's ACT (Advanced CMOS TTL-compatible) logic series, engineered for high-speed, high-drive 5-V digital interfacing in industrial, telecom, and instrumentation applications.
FAQ
What is the operating voltage range for the SN74ACT244DW?
The SN74ACT244DW operates from 4.5 V to 5.5 V. This range accommodates standard 5-V supply tolerances and ensures reliable functionality across variations in power rail stability. Operation outside this range may cause undefined behavior or permanent damage, as specified in the absolute maximum ratings table of the official SN74ACT244DW datasheet.
Does the SN74ACT244DW support TTL-level inputs?
Yes, the SN74ACT244DW features TTL-compatible inputs with VIH ≥ 2.0 V and VIL ≤ 0.8 V at 5 V VCC. This allows direct connection to legacy 74LS, 74F, and other 5-V TTL outputs without level-shifting circuitry, preserving signal integrity and simplifying board design in mixed-logic systems.
Can the SN74ACT244DW drive LEDs directly?
Yes, the SN74ACT244DW can drive LEDs directly in sink or source configurations using appropriate current-limiting resistors. Each output delivers up to 24 mA, sufficient for standard indicator LEDs. For example, a 1-kΩ resistor at 5 V limits current to ~5 mA, well within the SN74ACT244DW's rated output capability and safe for continuous operation.
What is the thermal resistance (RθJA) of the SN74ACT244DW in its SOIC package?
The SN74ACT244DW in the DW (SOIC-20) package has a junction-to-ambient thermal resistance (RθJA) of 101.2 °C/W, as measured under JEDEC JESD51-2 conditions. This value assumes a standard 2-layer PCB with 1 in² copper pour; actual thermal performance depends on board layout, copper area, and airflow.
Is the SN74ACT244DW pin-compatible with other members of the SN74x244 family?
Yes, all SN74x244 variants-including SN74ACT244DW, SN74LVC244APWR, and SN74AC244N-share identical 20-pin SOIC pinouts and functional pin assignments. However, electrical characteristics (voltage range, drive strength, timing) differ significantly, so electrical validation is required before substitution-even with matching pinouts.
SN74ACT244DW 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
SN74ACT244DW FAQ
1.How can I place an order for SN74ACT244DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244DW 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 SN74ACT244DW reliable?
The price and inventory of SN74ACT244DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244DW is usually 5 days.
3.What payment methods are accepted for SN74ACT244DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244DW?
SN74ACT244DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244DW 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 SN74ACT244DW?
For technical support, including SN74ACT244DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244DW requirements.
6.How does Aetrix verify that SN74ACT244DW is sourced from the original manufacturer or authorized distributors?
All SN74ACT244DW 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 SN74ACT244DW meets industry standards.
7.What is the process for return or replacement of SN74ACT244DW?
All SN74ACT244DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244DW, 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 SN74ACT244DW part is unused and in its original packaging.
Return procedure for SN74ACT244DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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