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Texas Instruments SN74AC244DW
- Part No.:
- SN74AC244DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AC244DW.pdf
- Description:
- IC BUFF NON-INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:483
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Product details
Overview
SN74AC244DW from Texas Instruments is an octal non-inverting buffer/driver with 3-state outputs, designed for bus-oriented transmission and memory address driving in industrial and telecom systems. It operates from 2V to 6V VCC, supports 5V logic levels, delivers ≤7.5ns propagation delay at 5V, and features independent dual-output-enable (1OE/2OE) control for flexible bus management.
For engineers reviewing the SN74AC244DW datasheet, SN74AC244DW pinout, SN74AC244DW application, or SN74AC244DW equivalent, this page provides verified functional specifications, SOIC-20 package layout details, real-world use cases in LED displays and network switches, and validated alternative options for design continuity and sourcing resilience.
Technical Context
The SN74AC244DW implements two independent 4-bit buffer groups (Group 1: A1–A4 → Y1–Y4; Group 2: A1–A4 → Y1–Y4), each controlled by its own active-low output-enable input (1OE, 2OE). Its CMOS AC logic family ensures TTL-compatible input thresholds and rail-to-rail output swing across 2V–6V supply range.
Each output drives up to ±24mA at 5V while maintaining guaranteed VOH ≥ 3.7V and VOL ≤ 0.44V under load, enabling direct interface with legacy 5V TTL and modern mixed-voltage systems. Input voltage tolerance to 6V allows safe interfacing with higher-voltage peripherals without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports single-supply operation across 3.3V and 5V systems without external regulators |
| tPD (max) | 7.5ns at VCC = 5V - enables high-speed data transfer in memory address and clock distribution paths |
| IOH/IOL | ±24mA at VCC = 4.5V - sufficient drive strength for fan-out to multiple TTL loads or LED segments |
| Input Voltage Tolerance | Up to 6V - permits direct connection to 5V buses even when powered from 3.3V, eliminating level shifters |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications including motor-drive control boards |
| Power Dissipation Cap. | 45pF per buffer - low dynamic power enables dense integration in space-constrained PCB layouts |
Pinout & Package
SN74AC244DW is housed in a 20-pin SOIC (DW) package measuring 12.8mm × 10.3mm (body size: 12.8mm × 7.5mm), with standard 1.27mm pitch and gull-wing leads suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable inputs - independently disable Group 1 or Group 2 outputs into high-impedance state |
| 2–5, 11–14 | 1A1–1A4, 2A1–2A4 | Buffer input pins - accept 2V–6V logic signals; compatible with 3.3V/5V sources without clamping diodes |
| 12–15, 7–10 | 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs - drive bidirectional buses or LEDs with ±24mA sink/source capability |
| 10, 20 | GND, VCC | Power rails - require local 0.1µF bypass capacitor at VCC pin to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2V–6V) | Enables interoperability between 3.3V microcontrollers and 5V peripheral buses without voltage translation |
| Independent dual OE control | Allows selective isolation of two 4-bit data lanes-critical for multiplexed address/data bus architectures |
| 7.5ns max tPD at 5V | Meets timing budgets in high-throughput server backplanes and telecom line-card interfaces |
| 6V-tolerant inputs | Eliminates need for external protection diodes when interfacing with legacy 5V logic in mixed-voltage systems |
| High-impedance outputs | Prevents bus contention during power-up/down sequences and enables hot-swap compatibility in modular systems |
Applications
| LED Displays | Network Switches |
|---|---|
Use Scenario: Driving 7-segment or dot-matrix LED arrays in industrial HMIs and signage controllers. IC Role / Device Role / Timing Role: Octal buffer providing current gain and logic-level translation between MCU GPIOs and LED anode/cathode drivers. Use Value: ±24mA output drive directly powers common-anode LED segments without external transistors, reducing BOM count and board area. |
Use Scenario: Isolating and buffering address/control lines between switch fabric ASICs and PHY modules. IC Role / Device Role / Timing Role: Bidirectional bus driver managing shared configuration registers and status reporting across multi-chip switch subsystems. Use Value: Dual OE control enables time-multiplexed access to shared I²C/SPI buses, preventing signal contention during concurrent read/write operations. |
| Telecom Infrastructure | Motor-Drive Control Boards |
Use Scenario: Level-shifting and buffering control signals between FPGA-based baseband processors and RF front-end ICs. IC Role / Device Role / Timing Role: Non-inverting buffer ensuring clean, fast edge transitions on clock enable and reset lines in high-density telecom line cards. Use Value: 7.5ns propagation delay guarantees setup/hold timing margins for synchronous serial interfaces operating up to 100MHz. |
Use Scenario: Interfacing microcontroller PWM outputs to gate drivers for three-phase inverter stages. IC Role / Device Role / Timing Role: Signal conditioner isolating MCU logic from noisy power-stage feedback and gate-drive return paths. Use Value: High-impedance state during MCU reset prevents unintended gate activation, enhancing system safety during startup/fault recovery. |
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 (1.65V–3.6V); 3.3V-only operation; 3.7ns tPD at 3.3V | Better suited for battery-powered or ultra-low-power 3.3V systems; not 5V-tolerant | Select when operating exclusively at 3.3V and requiring faster switching with lower static current (ICC = 10µA typical) |
| 74AC244N | Same AC logic family and pinout; PDIP-20 package (24.33mm × 9.4mm); wider body and through-hole mounting | Preferred for prototyping, manual assembly, or legacy through-hole designs where SOIC reflow is impractical | Choose for breadboard evaluation, repair replacements, or industrial control panels requiring mechanical robustness over density |
Compared with SN74AC244DW, SN74LVC244APWR offers superior speed and power efficiency at 3.3V but lacks 5V tolerance, while 74AC244N provides identical logic behavior in a through-hole package-enabling drop-in replacement in legacy PCBs without layout changes.
Availability
SN74AC244DW is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and LED display applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74AC244DW 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.
The SN74AC244DW belongs to TI's AC logic family-designed for high-speed, low-power, mixed-voltage digital interfacing in demanding industrial and telecom environments.
FAQ
What is the maximum operating voltage for SN74AC244DW?
The SN74AC244DW supports a supply voltage range of 2V to 6V. Its absolute maximum rating is 7V on VCC, but continuous operation above 6V is not recommended. The device maintains full functionality-including guaranteed VOH/VOL and timing-across the entire 2V–6V range, making it ideal for mixed-voltage system interfacing.
Does SN74AC244DW support 3.3V logic levels when powered from 5V?
Yes. When SN74AC244DW is powered from 5V, its inputs accept 3.3V logic levels as valid high/low signals because VIH is specified at 3.15V (min) and VIL at 1.35V (max) for VCC = 4.5V. This ensures reliable interfacing with 3.3V microcontrollers without level-shifting circuitry.
Can SN74AC244DW drive LEDs directly?
Yes. Each output of SN74AC244DW can source or sink up to ±24mA at 5V, which is sufficient to drive standard 20mA LEDs. For common-anode configurations, connect the LED anode to VCC and cathode to a Y output; for common-cathode, reverse the connection. Always verify current-limiting resistor values using the actual VOH/VOL specs.
What is the thermal resistance (RθJA) of SN74AC244DW in SOIC package?
The junction-to-ambient thermal resistance (RθJA) for SN74AC244DW in the DW (SOIC-20) package is 101.2°C/W, as measured per JEDEC JESD51 standards. This value assumes standard 2-layer PCB layout with 1 in² copper pour under the package; performance improves with enhanced thermal vias and larger ground planes.
Is SN74AC244DW pin-compatible with other members of the '244 family?
Yes-SN74AC244DW shares identical pinout and function mapping with all 20-pin variants of the '244 family, including SN74LVC244APWR (TSSOP), SN74AC244N (PDIP), and SN74AC244DGSR (VSSOP). However, voltage ratings, drive strength, and timing differ; always validate electrical compatibility before substitution.
SN74AC244DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AC244DW FAQ
1.How can I place an order for SN74AC244DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC244DW 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 SN74AC244DW reliable?
The price and inventory of SN74AC244DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC244DW is usually 5 days.
3.What payment methods are accepted for SN74AC244DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC244DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC244DW?
SN74AC244DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC244DW 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 SN74AC244DW?
For technical support, including SN74AC244DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC244DW requirements.
6.How does Aetrix verify that SN74AC244DW is sourced from the original manufacturer or authorized distributors?
All SN74AC244DW 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 SN74AC244DW meets industry standards.
7.What is the process for return or replacement of SN74AC244DW?
All SN74AC244DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC244DW, 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 SN74AC244DW part is unused and in its original packaging.
Return procedure for SN74AC244DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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