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Texas Instruments SN74HCT244PWE4
- Part No.:
- SN74HCT244PWE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCT244PWE4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,682
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Product details
Overview
SN74HCT244PWE4 from Texas Instruments is an octal non-inverting 3-state buffer/line driver IC operating at 4.5–5.5 V, delivering ±6 mA output drive per channel, 13 ns typical propagation delay (at 5.5 V, 50 pF), and 80 µA maximum quiescent supply current. It serves as a bus interface and memory address register buffer in industrial control backplanes and high-density logic systems.
For engineers reviewing the SN74HCT244PWE4 datasheet, SN74HCT244PWE4 pinout, SN74HCT244PWE4 application, or SN74HCT244PWE4 equivalent, this page delivers verified electrical specs, TSSOP-20 package details, functional mode behavior, real-world use cases in LED displays and network switches, and two validated alternative parts with documented differences.
Technical Context
The SN74HCT244PWE4 implements two independent 4-bit non-inverting buffers, each with dedicated active-low output-enable (OE) inputs (1OE on Pin 1, 2OE on 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.
It uses HCMOS-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) and TTL-voltage-compatible inputs, ensuring interoperability with legacy 5 V logic families. Its 3-state outputs drive up to 15 LSTTL loads while maintaining low ICC (≤80 µA) and fast edge rates (tr/tf ≤ 6 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with regulated 5 V systems and tolerance for rail droop in industrial power domains. |
| Propagation Delay (tpd) | 13 ns typical at VCC = 5.5 V, CL = 50 pF - enables reliable timing in 30+ MHz bus interfaces with margin. |
| Output Drive | ±6 mA per Y-output at VCC = 5 V - sufficient to drive 15 LSTTL loads or terminate short PCB traces without external buffering. |
| Quiescent ICC | 80 µA maximum - supports low-power standby modes in always-on infrastructure equipment. |
| Input Leakage | ±1 µA maximum - prevents unintended logic transitions when inputs are pulled via high-value resistors. |
| 3-State Enable Time (ten) | 19 ns max at VCC = 4.5 V, CL = 50 pF - allows rapid bus arbitration in time-critical I/O expansion applications. |
| ESD Rating (HBM) | ±2000 V - meets JEDEC JS-001 Class 2 requirements for robust handling in automated assembly lines. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 6.4 mm body size, 0.65 mm lead pitch, thin-profile surface-mount construction suitable for high-density PCB layouts and automated reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Output Enable (1OE, 2OE) | Active-low control inputs - assert low to enable respective 4-bit buffer group; tie high via pullup for power-up high-Z safety. |
| 2–5, 11–14 | Inputs (1A1–1A4, 2A1–2A4) | CMOS/TTL-compatible data inputs - accept 0.8 V/2.0 V thresholds; must be terminated to VCC or GND if unused. |
| 3, 5, 7, 9, 12, 14, 16, 18 | Outputs (1Y1–1Y4, 2Y1–2Y4) | 3-state CMOS outputs - sink/source ±6 mA, high-Z when OE high; require no external pullups in bus-shared configurations. |
| 10 | GND | Ground reference - connect to system ground plane with low-inductance path to minimize switching noise coupling. |
| 20 | VCC | Positive supply - bypass with 0.1 µF ceramic capacitor placed within 3 mm of pin to suppress high-frequency supply transients. |
Key Features
| Feature | Design Value |
|---|---|
| Octal 3-state buffering | Two independent 4-bit groups allow selective bus isolation - e.g., isolate CPU address bus from peripheral I/O without full system reset. |
| TTL-compatible inputs | VIH ≥ 2.0 V / VIL ≤ 0.8 V at 5 V enables direct connection to legacy 5 V microcontrollers and FPGAs without level-shifting. |
| Low ICC consumption | 80 µA max ICC supports energy-sensitive applications like remote telemetry nodes where standby current impacts battery life. |
| High noise immunity | Input hysteresis and 400 mV noise margin (VCC = 5 V) prevent false triggering in electrically noisy industrial environments. |
| Fast enable/disable timing | ten/tdis ≤ 19 ns ensures sub-20 ns bus turnaround - critical for high-throughput memory-mapped I/O in programmable logic controllers. |
Applications
| LED Display Driver Interface | Network Switch Backplane Buffer |
|---|---|
Use Scenario: Driving 8-segment alphanumeric displays and dot-matrix panels in industrial HMIs and instrumentation dashboards. IC Role / Device Role / Timing Role: Buffers parallel data from MCU GPIO ports to LED column drivers while providing current gain and bus isolation. Use Value: ±6 mA per output eliminates need for discrete transistor arrays; 3-state capability allows shared display bus across multiple display zones. |
Use Scenario: Isolating and strengthening address/data signals between switch ASICs and external SRAM or packet buffer memory. IC Role / Device Role / Timing Role: Acts as memory address register buffer and bus driver in Layer 2/L3 switch control planes. Use Value: 13 ns tpd ensures setup/hold timing compliance at 33 MHz PCI-like buses; high drive strength maintains signal integrity over 10+ cm PCB traces. |
| Industrial I/O Expander Hub | Telecom Line Card Signal Conditioning |
Use Scenario: Extending GPIO count on PLC main controllers via parallel I/O modules with local bus arbitration. IC Role / Device Role / Timing Role: Provides 3-state-enabled bidirectional data path between host controller and modular I/O daughterboards. Use Value: Independent OE pins permit staggered enable timing - avoids simultaneous switching noise during hot-swap I/O module insertion. |
Use Scenario: Level-shifting and driving control signals (e.g., reset, clock enable, configuration latches) in multi-slot telecom line cards. IC Role / Device Role / Timing Role: Serves as robust 5 V logic interface between FPGA management logic and analog front-end ICs. Use Value: ±2000 V HBM ESD rating ensures reliability during field maintenance; low ICC reduces thermal load in tightly packed 1RU chassis. |
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 |
|---|---|---|---|
| SN74HCT244DWR | SOIC-20 package (12.8 mm × 10.3 mm), same electrical specs, -40°C to 125°C operating range. | Better thermal dissipation (RθJA = 109.1°C/W vs 131.8°C/W) but larger footprint - preferred for through-hole prototyping or high-temperature ambient designs. | Select when board space permits larger package and higher junction temperature margin is required. |
| SN74LV244APWR | Lower voltage operation (2.0–5.5 V), 16 ns tpd (typ), ±8 mA drive, 1 µA ICC - LV family with improved noise immunity. | Supports mixed-voltage systems (e.g., 3.3 V MCU + 5 V peripherals); not drop-in due to different VIH/VIL thresholds and timing. | Choose for new 3.3 V–5 V hybrid designs requiring lower power and wider supply flexibility - requires layout and timing validation. |
Compared with SN74HCT244DWR and SN74LV244APWR, the SN74HCT244PWE4 offers optimal balance of compact TSSOP-20 footprint, proven 5 V TTL interoperability, and industrial-grade ESD robustness - making it ideal for space-constrained, high-reliability 5 V logic interfacing where pin compatibility and legacy support are mandatory.
Availability
SN74HCT244PWE4 is available at Aetrix Electronics and suitable for industrial I/O expanders, telecom line card interfaces, and LED display driver circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HCT244PWE4 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 decades of industrial-grade reliability validation.
The SN74HCT244PWE4 belongs to TI's 74HCT logic family - engineered for seamless 5 V TTL-to-CMOS interfacing in mission-critical infrastructure, where noise immunity, bus contention avoidance, and long-term supply stability are design priorities.
FAQ
What is the operating temperature range for SN74HCT244PWE4?
The SN74HCT244PWE4 is rated for operation from –40°C to +85°C, as confirmed in TI's official orderable addendum and electrical characteristics tables. This range supports deployment in commercial and industrial environments including factory automation panels and outdoor telecom enclosures. The device maintains full specification compliance - including VOH/VOL, tpd, and ICC - across this entire range. SN74HCT244PWE4 does not support the extended –40°C to +125°C grade offered by some other PW-packaged variants like SN74HCT244PWR.
Does SN74HCT244PWE4 support true bidirectional data flow?
No - the SN74HCT244PWE4 is a unidirectional octal buffer: data flows only from A-inputs to Y-outputs. It lacks internal direction control or bus transceiver logic. Bidirectional operation requires external control of the two OE pins and careful system-level arbitration - for example, using one SN74HCT244PWE4 for transmit and another for receive on separate signal paths. True bidirectional alternatives include the SN74LVC245A or SN74ABT245B, which integrate direction control and auto-bus contention protection.
Can SN74HCT244PWE4 drive standard 5 V TTL loads directly?
Yes - the SN74HCT244PWE4 is explicitly characterized to drive up to 15 LSTTL loads per output, as stated in its datasheet Features section and verified in Electrical Characteristics tables (IOH = –6 mA, IOL = 6 mA at VCC = 5 V). Its VOH ≥ 3.7 V and VOL ≤ 0.4 V under full load meet LSTTL VIH/VIL thresholds. No series termination or external pull-ups are needed for standard TTL fanout, though proper VCC bypassing and OE pull-up resistors remain essential for stable operation.
What is the recommended bypass capacitor for SN74HCT244PWE4?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible (within 3 mm) to the VCC pin (Pin 20) and GND (Pin 10) of the SN74HCT244PWE4. This value is specified in Section 8.3 (Power Supply Recommendations) of the datasheet to suppress high-frequency switching noise and maintain stable rail voltage during output transitions. For boards with multiple SN74HCT244PWE4 devices, a shared bulk capacitor (e.g., 4.7 µF tantalum) near the power entry point is advised in addition to local 0.1 µF units.
How should unused inputs be handled on SN74HCT244PWE4?
All unused inputs on the SN74HCT244PWE4 - including A-inputs (Pins 2–5, 11–14) and OE pins (Pins 1, 19) - must be tied to a valid logic level (VCC or GND) to prevent floating states that cause excessive ICC, oscillation, or ESD susceptibility. TI's datasheet Section 8.4.1 mandates this in Layout Guidelines. For OE pins, tie to VCC via a 10 kΩ pullup resistor to ensure high-impedance default on power-up; for unused A-inputs, connect directly to GND or VCC depending on desired default output state.
SN74HCT244PWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
SN74HCT244PWE4 FAQ
1.How can I place an order for SN74HCT244PWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT244PWE4 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 SN74HCT244PWE4 reliable?
The price and inventory of SN74HCT244PWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT244PWE4 is usually 5 days.
3.What payment methods are accepted for SN74HCT244PWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT244PWE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT244PWE4?
SN74HCT244PWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT244PWE4 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 SN74HCT244PWE4?
For technical support, including SN74HCT244PWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT244PWE4 requirements.
6.How does Aetrix verify that SN74HCT244PWE4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT244PWE4 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 SN74HCT244PWE4 meets industry standards.
7.What is the process for return or replacement of SN74HCT244PWE4?
All SN74HCT244PWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT244PWE4, 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 SN74HCT244PWE4 part is unused and in its original packaging.
Return procedure for SN74HCT244PWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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