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Texas Instruments SN74HCT244DWE4
- Part No.:
- SN74HCT244DWE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HCT244DWE4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,288
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Product details
Overview
SN74HCT244DWE4 from Texas Instruments is an octal non-inverting 3-state buffer/line driver IC designed for bus interface and memory address driving in 5V TTL-compatible systems. It operates from 4.5V to 5.5V, delivers ±6mA output drive per channel, exhibits 13ns typical propagation delay (at 5.5V, CL=50pF), and consumes ≤80µA quiescent current - enabling high-density, low-power data routing in servers and telecom infrastructure.
For engineers reviewing the SN74HCT244DWE4 datasheet, SN74HCT244DWE4 pinout, SN74HCT244DWE4 application, or SN74HCT244DWE4 equivalent, key selection criteria include its dual 4-bit independent 3-state architecture, TTL-voltage-compatible inputs, high-current drive capability (15 LSTTL loads), and SOIC-20 package compatibility with industrial temperature range (–40°C to 85°C).
Technical Context
The SN74HCT244DWE4 implements two independent 4-bit non-inverting buffers, each controlled by a dedicated output-enable (OE) input (Pin 1 and Pin 19). When OE is low, A-inputs pass directly to Y-outputs; when OE is high, all eight outputs enter high-impedance state - enabling bidirectional bus sharing without contention.
Its HCT logic family ensures CMOS-level power efficiency while maintaining TTL input thresholds (VIH = 2.0V min, VIL = 0.8V max at VCC = 4.5–5.5V) and robust noise immunity. The device supports load capacitances up to 150pF and maintains stable switching performance across –40°C to 85°C ambient operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - compatible with standard 5V logic rails and tolerant of supply ripple common in server PSU and industrial power domains. |
| Propagation Delay (tpd) | 13ns typical at VCC = 5.5V, CL = 50pF - enables reliable timing in high-speed address/data buffering up to ~30 MHz clock domains. |
| Output Drive | ±6mA per channel at 5V - sufficient to drive 15 LSTTL loads, supporting fanout-critical applications like LED display column drivers and I/O expander backplanes. |
| Quiescent Current (ICC) | ≤80µA maximum - minimizes standby power in always-on network switch control planes and telecom line cards. |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2.0V, VIL ≤ 0.8V) - interoperable with legacy 74LS, 74ALS, and microcontroller GPIOs without level-shifting. |
| 3-State Enable Timing | ten = 19ns typical (VCC = 5.5V, CL = 50pF) - ensures clean bus release before new data assertion, critical for glitch-free memory address multiplexing. |
Pinout & Package
SN74HCT244DWE4 is packaged in a 20-pin SOIC (DW) with 12.80mm × 10.3mm footprint and 12.8mm × 7.5mm body size. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Group 1 (Pins 2–9) and Group 2 (Pins 11–18); tied high via pullup for power-up high-Z safety. |
| 2, 4, 6, 8 | 1A1–1A4 | Group 1 input channels - accept TTL-compatible signals for buffering to corresponding Y outputs. |
| 3, 5, 7, 9 | 1Y1–1Y4 | Group 1 non-inverting buffered outputs - drive buses or memory address registers with ±6mA sink/source capability. |
| 11, 13, 15, 17 | 2A1–2A4 | Group 2 input channels - electrically isolated from Group 1; enable independent control of two 4-bit data paths. |
| 12, 14, 16, 18 | 2Y1–2Y4 | Group 2 non-inverting buffered outputs - support dual-bus architectures such as CPU-to-peripheral and peripheral-to-memory paths. |
| 10 | GND | Ground reference for all logic and output stages - requires low-inductance connection to minimize ground bounce during simultaneous switching. |
| 20 | VCC | 5V power supply pin - must be decoupled with 0.1µF ceramic capacitor placed within 5mm of the pin per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit groups | Enables concurrent control of two separate data buses (e.g., address + data lines) using discrete OE signals - eliminates need for external gating logic. |
| High-current 3-state outputs | ±6mA drive per Y-output allows direct interfacing with LSTTL loads and long PCB traces (>10 cm) without signal degradation in telecom backplanes. |
| TTL-compatible inputs | VIH ≥ 2.0V and VIL ≤ 0.8V ensure seamless integration with legacy 74LS-based systems and mixed-logic designs without level translators. |
| Low ICC quiescent current | ≤80µA maximum reduces system-level standby power - critical for energy-sensitive applications like remote I/O modules and edge sensor nodes. |
| Controlled rise/fall times | Typical tt = 7ns (5.5V, CL = 50pF) balances speed and EMI; fast edges are manageable with proper termination and routing per TI's layout guidance. |
Applications
| Server Memory Address Buffering | LED Display Column Driver |
|---|---|
Use Scenario: Driving parallel address lines from a CPU or memory controller to multiple DRAM banks in a 1U server blade. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer that isolates address bus segments during memory bank switching, preventing contention and ensuring deterministic timing. Use Value: Dual OE control allows staggered enable timing between memory banks; ±6mA drive sustains signal integrity across dense, multi-layer backplane routing. |
Use Scenario: Controlling column anodes in a 16×32 multiplexed LED matrix used in industrial status panels. IC Role / Device Role / Timing Role: High-current line driver translating MCU GPIO outputs into column-select signals capable of sinking full LED current per segment. Use Value: 15-LSTTL load drive supports up to 120mA total column current; 13ns tpd enables >30Hz refresh rates with minimal ghosting. |
| Network Switch Control Plane Bus | Industrial I/O Expander Interface |
Use Scenario: Isolating and buffering configuration registers between a management MCU and PHY controllers in a managed Ethernet switch. IC Role / Device Role / Timing Role: Bidirectional bus interface element enabling hot-swap-safe register access via 3-state control synchronized to I²C or SPI transaction windows. Use Value: Independent OE pins allow precise timing alignment with protocol clocks; low ICC extends uptime in fanless, thermally constrained switch chassis. |
Use Scenario: Extending GPIO count from a microcontroller to drive relays, solenoids, and indicator LEDs in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Octal buffer providing level-shifted, current-boosted outputs for industrial-grade 5V actuator interfaces. Use Value: TTL-compatible inputs simplify connection to 3.3V/5V MCUs; ±6mA per channel supports direct drive of 5V optocouplers and small-signal relays. |
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 |
|---|---|---|---|
| SN74HCT244PWRE4 | TSSOP-20 package (6.5mm × 6.4mm), same electrical specs, MSL Level-1, rated for –40°C to 125°C. | Better thermal performance (RθJA = 131.8°C/W vs. 109.1°C/W) and wider temp range - preferred for under-hood automotive or high-ambient industrial enclosures. | Select when board space is constrained and extended temperature operation is required; requires reflow-compatible layout. |
| SN74LVC244APWR | Lower VCC range (1.65V–3.6V), higher speed (tpd = 5.3ns typ), but only ±24mA drive and no TTL input compatibility. | Designed for 3.3V-only systems; incompatible with 5V buses or legacy TTL sources without level translation. | Choose only for new 3.3V designs prioritizing speed and low voltage - not a drop-in replacement for SN74HCT244DWE4 in 5V environments. |
Compared with SN74HCT244PWRE4, the SN74HCT244DWE4 offers lower thermal resistance in SOIC packaging and proven reliability in legacy 5V infrastructure; versus SN74LVC244APWR, it preserves TTL interoperability and 5V robustness at the cost of speed and voltage flexibility.
Availability
SN74HCT244DWE4 is available at Aetrix Electronics and suitable for servers, LED displays, and network switches requiring stable component supply with industrial temperature support (–40°C to 85°C) and long-term manufacturing continuity.
Supply support for SN74HCT244DWE4 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 SN74HCT244DWE4 belongs to TI's HCT logic family - engineered for 5V TTL-compatible interfacing with CMOS power efficiency, targeting memory addressing, bus isolation, and peripheral expansion in cost-sensitive, high-reliability systems.
FAQ
What is the operating temperature range for SN74HCT244DWE4?
The SN74HCT244DWE4 is specified for operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in network equipment, factory automation controllers, and outdoor telecom cabinets where thermal cycling and extended environmental exposure occur. Its electrical characteristics - including VOH, VOL, and tpd - are guaranteed across this full range per TI's SCLS175I datasheet revision.
Does SN74HCT244DWE4 require external pull-up resistors on its OE pins?
Yes - for fail-safe high-impedance behavior during power-up or power-down, both OE pins (1 and 19) of the SN74HCT244DWE4 must be tied to VCC through pull-up resistors. TI recommends values based on the driving source's current-sinking capability; typical values range from 4.7kΩ to 10kΩ. Leaving OE floating risks undefined output states and potential bus contention.
Can SN74HCT244DWE4 drive standard 5V TTL loads directly?
Yes - the SN74HCT244DWE4 is explicitly rated to drive up to 15 LSTTL loads per output, with ±6mA sink/source capability at 5V. Its VOH ≥ 3.7V (min, IOH = –6mA) and VOL ≤ 0.4V (max, IOL = 6mA) meet or exceed standard TTL voltage thresholds, enabling direct connection to 74LS, 74ALS, and other legacy 5V logic families without level-shifting circuitry.
What is the maximum capacitive load SN74HCT244DWE4 can drive reliably?
The SN74HCT244DWE4 is characterized for load capacitances up to 150pF, with verified switching performance (tpd, ten, tdis) specified at both 50pF and 150pF in the datasheet. For loads exceeding 150pF - such as long traces or multiple fanouts - signal integrity may degrade; TI recommends series termination or reduced edge rates, and confirms stable operation only within the tested 50–150pF range.
Is SN74HCT244DWE4 pin-compatible with other members of the SN74HCT244 family?
Yes - all SN74HCT244 variants (e.g., SN74HCT244DBR, SN74HCT244PWR, SN74HCT244N) share identical pinout and logic function across SOIC, SSOP, TSSOP, PDIP, and VSSOP packages. The SN74HCT244DWE4 uses the standard 20-pin SOIC (DW) footprint; mechanical differences (e.g., body size, thermal pad) do not affect electrical connectivity or PCB layout compatibility.
SN74HCT244DWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HCT244DWE4 FAQ
1.How can I place an order for SN74HCT244DWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT244DWE4 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 SN74HCT244DWE4 reliable?
The price and inventory of SN74HCT244DWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT244DWE4 is usually 5 days.
3.What payment methods are accepted for SN74HCT244DWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT244DWE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT244DWE4?
SN74HCT244DWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT244DWE4 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 SN74HCT244DWE4?
For technical support, including SN74HCT244DWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT244DWE4 requirements.
6.How does Aetrix verify that SN74HCT244DWE4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT244DWE4 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 SN74HCT244DWE4 meets industry standards.
7.What is the process for return or replacement of SN74HCT244DWE4?
All SN74HCT244DWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT244DWE4, 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 SN74HCT244DWE4 part is unused and in its original packaging.
Return procedure for SN74HCT244DWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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