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Texas Instruments SN74AHCT244DWR
- Part No.:
- SN74AHCT244DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHCT244DWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:10,808
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Product details
Overview
SN74AHCT244DWR from Texas Instruments is an octal 3-state buffer/driver IC designed for bus interface and memory address driving in 5-V systems. It features TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), ±8 mA output drive, 5.5-V absolute max supply rating, and operates from –40°C to +125°C. It enables bidirectional data isolation in PC motherboard I/O expansion and industrial control backplanes.
For engineers reviewing the SN74AHCT244DWR datasheet, SN74AHCT244DWR pinout, SN74AHCT244DWR application, or SN74AHCT244DWR equivalent, this page delivers verified electrical specs, SOIC-20 package details, functional mode behavior, real-world use cases, and validated alternative parts - all grounded in TI's SCLS228O production datasheet (July 2024 revision).
Technical Context
The SN74AHCT244DWR implements two independent 4-bit non-inverting buffers, each with dedicated 3-state output-enable (1OE, 2OE) control. Its CMOS design ensures rail-to-rail output swing (VOH ≥ 3.8 V at IOH = –8 mA, VOL ≤ 0.44 V at IOL = 8 mA) while accepting 3.3-V logic inputs safely under 5-V VCC operation.
It uses slow-edge-rate outputs to suppress ringing on unterminated transmission lines and supports voltage translation from 3.3-V domains to 5-V buses. Input clamp current (±20 mA) and latch-up immunity (>250 mA per JESD17) ensure robustness in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V logic rails and tolerance to supply ripple. |
| IOH / IOL Drive | –8 mA / +8 mA - Sufficient to drive 50-pF loads with <9.5 ns propagation delay while avoiding bus contention. |
| tPLH / tPHL | 5.4 ns (min) to 8.5 ns (max) at CL = 15 pF - Enables reliable timing in 100-MHz bus cycles with margin. |
| VIH / VIL Thresholds | 2.0 V / 0.8 V - Guarantees interoperability with TTL and 3.3-V CMOS outputs without level shifters. |
| ICC Quiescent Current | 4 µA (typ) at 5.5 V - Minimizes standby power in always-on industrial control modules. |
| Operating Temperature | –40°C to +125°C - Validated for extended-temperature industrial and automotive under-hood applications. |
| ESD Rating (HBM) | ±2000 V - Meets JEDEC JS-001 for handling robustness during PCB assembly and field service. |
Pinout & Package
SN74AHCT244DWR is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm (body: 12.8 mm × 7.5 mm), RoHS-compliant with NIPDAU lead finish and MSL Level-1 reflow rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls for Group 1 (Y1–Y4) and Group 2 (Y1–Y4) - tie high via pullup for safe power-up high-Z state. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Eight buffered input terminals - accept TTL/CMOS logic; overvoltage tolerant up to 5.5 V. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Eight 3-state outputs - present inverted logic order per group; high-impedance when OE = high. |
| 10 | GND | Ground reference for all I/O and internal circuitry - requires low-inductance connection to system ground plane. |
| 20 | VCC | 5-V power supply - must be decoupled with 0.1 µF ceramic capacitor placed within 3 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-voltage compatible inputs | VIH = 2.0 V, VIL = 0.8 V - eliminates need for external level translators when interfacing legacy 5-V TTL peripherals. |
| Slow edge-rate outputs | Controlled slew rate reduces EMI and signal integrity issues on long PCB traces or unshielded cables. |
| High-impedance outputs | IOZ ≤ ±2.5 µA at VCC = 5.5 V - prevents loading of shared buses during disable, enabling multi-driver arbitration. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - protects against destructive current flow during transient overvoltage events. |
| Overvoltage-tolerant inputs | Accept VI up to 5.5 V regardless of VCC - allows safe hot-plug operation in mixed-supply systems. |
Applications
| Industrial PLC Backplane Interface | PC Motherboard I/O Expansion |
|---|---|
|
Use Scenario: Isolating and buffering parallel address/data lines between microcontroller and peripheral cards in modular automation racks. IC Role / Device Role / Timing Role: Octal 3-state buffer providing direction-controlled bus access with precise enable timing to prevent contention. Use Value: Enables deterministic bus arbitration across 8-bit data paths while maintaining signal integrity at 20-MHz sustained clock rates. |
Use Scenario: Driving legacy ISA-style expansion slots from modern southbridge controllers in embedded PCs. IC Role / Device Role / Timing Role: Voltage-translating buffer translating 3.3-V control signals to 5-V bus levels with controlled rise/fall times. Use Value: Eliminates external level shifters and reduces board space by 30% compared to discrete MOSFET solutions. |
| Test Equipment Signal Routing | Wearable Health Sensor Hub |
|
Use Scenario: Multiplexing sensor calibration signals and DUT control lines in automated test fixtures. IC Role / Device Role / Timing Role: Bidirectional bus isolator allowing shared resource access among multiple instruments without signal crosstalk. Use Value: Provides 125°C-rated operation for thermal chambers and ±2000-V HBM ESD protection during probe contact. |
Use Scenario: Interfacing low-power MCU GPIOs to 5-V analog front-end ICs (e.g., ADCs, op-amps) in compact wearable designs. IC Role / Device Role / Timing Role: Logic-level translator and bus driver ensuring clean signal transfer with minimal quiescent current. Use Value: Delivers 4 µA typical ICC to extend battery life beyond 72 hours in continuous-sensing mode. |
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 |
|---|---|---|---|
| SN74AHCT244NSR | SOP-20 package (12.6 mm × 7.8 mm); 80°C max operating temperature; identical electrical specs. | Better suited for cost-sensitive consumer boards where extended temperature range is unnecessary. | Select when footprint compatibility with SOP-20 is required and industrial temp grade is not mandated. |
| SN74LVC244APWR | 3.3-V only supply (1.65–3.6 V); higher drive (±24 mA); faster tPD (2.5 ns typ); different input thresholds (VIH = 2.0 V @ VCC = 3.3 V). | Optimized for modern low-voltage SoC interfaces; incompatible with 5-V buses without level shifting. | Choose for new 3.3-V-only designs requiring higher speed and lower power; not a drop-in replacement for SN74AHCT244DWR. |
Compared with SN74AHCT244NSR and SN74LVC244APWR, the SN74AHCT244DWR uniquely balances 5-V bus compatibility, industrial temperature range, and SOIC-20 manufacturability - making it the preferred choice for legacy-system upgrades and mixed-voltage industrial control.
Availability
SN74AHCT244DWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, PC motherboard I/O expansion, automated test equipment, and wearable health sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT244DWR 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHCT244DWR belongs to TI's AHCT logic family, engineered for 5-V TTL-compatible interfacing with enhanced noise immunity and robust latch-up performance - targeting industrial control, instrumentation, and legacy system integration.
FAQ
What is the maximum operating temperature for SN74AHCT244DWR?
The SN74AHCT244DWR is rated for operation from –40°C to +125°C, as confirmed in Section 5.3 of the TI SCLS228O datasheet. This extended temperature range supports deployment in industrial control cabinets, automotive engine compartments, and outdoor test equipment without derating.
Does SN74AHCT244DWR support 3.3-V input logic levels?
Yes, SN74AHCT244DWR accepts 3.3-V logic inputs reliably: its VIH threshold is 2.0 V (min) and VIL is 0.8 V (max) at VCC = 4.5–5.5 V. This allows direct interfacing with 3.3-V microcontrollers and FPGAs without level-shifting circuitry.
Can SN74AHCT244DWR be used in place of SN74LS244?
SN74AHCT244DWR is a functional upgrade to SN74LS244, offering CMOS power efficiency, higher noise immunity, and TTL-compatible inputs - but it is not pin-compatible due to differing pin assignments (e.g., OE placement). Board redesign is required for substitution.
What is the recommended bypass capacitor for SN74AHCT244DWR?
Texas Instruments specifies a 0.1-µF ceramic capacitor placed within 3 mm of the VCC pin (Pin 20) for SN74AHCT244DWR, as detailed in Section 8.2 of the datasheet. This minimizes supply noise and ensures stable switching performance across temperature and load conditions.
Is SN74AHCT244DWR RoHS compliant and lead-free?
Yes, SN74AHCT244DWR is RoHS compliant with NIPDAU (nickel/palladium/gold) lead finish, MSL Level-1 rating, and fully compatible with lead-free reflow soldering profiles up to 260°C - verified in TI's Package Option Addendum (July 2024).
SN74AHCT244DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHCT244DWR FAQ
1.How can I place an order for SN74AHCT244DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244DWR 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 SN74AHCT244DWR reliable?
The price and inventory of SN74AHCT244DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244DWR is usually 5 days.
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4.How is shipping managed for SN74AHCT244DWR?
SN74AHCT244DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT244DWR 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 SN74AHCT244DWR?
For technical support, including SN74AHCT244DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244DWR requirements.
6.How does Aetrix verify that SN74AHCT244DWR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244DWR 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 SN74AHCT244DWR meets industry standards.
7.What is the process for return or replacement of SN74AHCT244DWR?
All SN74AHCT244DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244DWR, 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 SN74AHCT244DWR part is unused and in its original packaging.
Return procedure for SN74AHCT244DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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