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Texas Instruments SN74HCT244PWR
- Part No.:
- SN74HCT244PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCT244PWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,523
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Product details
Overview
SN74HCT244PWR 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 driver in industrial control backplanes and LED display column drivers.
For engineers reviewing the SN74HCT244PWR datasheet, SN74HCT244PWR pinout, SN74HCT244PWR application, or SN74HCT244PWR equivalent, key selection criteria include TTL-compatible inputs, high-current 3-state outputs, thermal performance in TSSOP-20, and compatibility with 5-V logic systems requiring bus isolation and load driving capability.
Technical Context
The SN74HCT244PWR implements two independent 4-bit buffer sections, each with dedicated active-low output-enable (OE) control. Its CMOS HCT logic family ensures TTL-voltage-level input compatibility while maintaining low power consumption and fast switching.
Each output supports high-impedance, high, or low states under direct OE control-enabling bidirectional bus management without external direction logic. The device operates across –40°C to +125°C and drives up to 15 LSTTL loads per output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - Ensures robust operation across standard 5-V rail tolerances and brown-out immunity. |
| Propagation delay (tpd) | 13 ns typical at 5.5 V, CL = 50 pF - Enables reliable timing in high-speed 5-V bus interfaces up to ~30 MHz. |
| Output drive | ±6 mA per Y output at 5 V - Sufficient to directly drive LED segments or terminate short PCB traces without external buffers. |
| Quiescent ICC | 80 µA maximum - Supports low-power standby modes in always-on industrial I/O modules. |
| Input compatibility | TTL-voltage compatible (VIH = 2 V min, VIL = 0.8 V max) - Interoperates seamlessly with legacy 5-V microcontrollers and FPGAs. |
| Operating temperature | –40°C to +125°C - Qualified for under-hood automotive ECUs and industrial motor drive control boards. |
| ESD rating (HBM) | ±2000 V - Meets IEC 61000-4-2 Level 2 for board-level handling in manufacturing environments. |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 6.4 mm body size, 0.65 mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable inputs - Assert low to enable respective 4-bit buffer section; tie high via pullup for safe power-up high-Z state. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Buffer input terminals - Accept TTL-compatible logic signals; must be terminated to VCC or GND if unused to prevent floating inputs. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | 3-state buffered outputs - Drive bus lines or LED columns; enter high-impedance when corresponding OE is high. |
| 10 | GND | Ground reference - Requires low-inductance connection to system ground plane to minimize switching noise coupling. |
| 20 | VCC | 5-V power supply - Must be bypassed with 0.1 µF ceramic capacitor placed within 3 mm of the pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Octal 3-state buffering | Two independent 4-bit sections with separate OE pins enable selective bus segment isolation without software overhead. |
| TTL-compatible inputs | Accepts standard 5-V TTL logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), eliminating level-shifter requirements in mixed-logic systems. |
| High-output drive | ±6 mA per output supports direct connection to 15 LSTTL loads or LED segments with series resistors ≤ 680 Ω at 5 V. |
| Low quiescent power | 80 µA max ICC allows integration into power-sensitive applications such as battery-backed I/O expanders or remote sensors. |
| Industrial temperature range | –40°C to +125°C operation enables use in motor drives, telecom line cards, and factory automation controllers without derating. |
Applications
| LED Display Driver | Industrial Backplane Buffer |
|---|---|
|
Use Scenario: Driving 8-column segments of a 16×8 alphanumeric LED matrix in a factory HMI panel. IC Role / Device Role / Timing Role: Acts as column-scan output buffer, translating MCU GPIO logic levels to higher-current drive for common-anode LED columns. Use Value: Eliminates need for discrete transistor arrays; ±6 mA per output ensures uniform brightness across all segments at 5 V. |
Use Scenario: Isolating and strengthening address/data bus signals between a microcontroller and multiple peripheral ICs on a DIN-rail mounted PLC carrier board. IC Role / Device Role / Timing Role: Functions as a unidirectional address latch buffer, enabling clean signal propagation across 10 cm PCB traces with minimal skew. Use Value: 13 ns tpd and 15-LSTTL drive capability maintain setup/hold timing margins even with distributed capacitive loading. |
| Network Switch Control Logic | Motor Driver Interface |
|
Use Scenario: Managing status LED indicators and configuration jumpers on a managed Ethernet switch's front-panel PCB. IC Role / Device Role / Timing Role: Provides 3-state-controlled GPIO expansion for LED drivers and DIP-switch readback, multiplexed over shared control lines. Use Value: Independent OE pins allow dynamic reconfiguration of I/O direction without changing MCU firmware or adding external logic. |
Use Scenario: Interfacing a 5-V microcontroller to dual H-bridge gate drivers in a BLDC motor controller, where logic-level translation and noise immunity are critical. IC Role / Device Role / Timing Role: Buffers PWM and direction signals before entering high-noise power stage; suppresses ground bounce via controlled edge rates. Use Value: TTL-compatible inputs reject noise from adjacent power traces; 125°C rating ensures reliability near heatsinks and MOSFETs. |
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 |
|---|---|---|---|
| SN74HCT244DWRE4 | SOIC-20 package (12.8 mm × 10.3 mm), same electrical specs, rated –40°C to +85°C. | Suitable for cost-sensitive, lower-density PCBs where thermal margin is less constrained and manual assembly is preferred. | Select when board space permits larger footprint and ambient temperature stays below 85°C. |
| SN74LVC244APWR | 3.3-V only (1.65–3.6 V), lower drive (±24 mA), faster tpd (5.3 ns), but not TTL-input compatible. | Requires level shifting for 5-V systems; better suited for modern low-voltage FPGA/CPU I/O expansion. | Choose only for new 3.3-V designs needing higher speed and lower power; not drop-in for SN74HCT244PWR. |
Compared with SN74HCT244DWRE4 and SN74LVC244APWR, the SN74HCT244PWR uniquely balances 5-V TTL interoperability, industrial temperature range, and compact TSSOP packaging-making it optimal for space-constrained, thermally demanding 5-V embedded control applications.
Availability
SN74HCT244PWR is available at Aetrix Electronics and suitable for industrial motor control, LED display subsystems, and network infrastructure equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HCT244PWR 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 heritage in industrial-grade logic families.
The SN74HCT244PWR belongs to TI's HCT logic product line, engineered for seamless 5-V TTL-to-CMOS interfacing in ruggedized industrial and automotive control systems where reliability and voltage compatibility are critical.
FAQ
What is the maximum operating temperature for the SN74HCT244PWR?
The SN74HCT244PWR is rated for continuous operation from –40°C to +125°C. This specification is confirmed in the Recommended Operating Conditions table of the official datasheet (SCLS175I, Section 5.3), and applies specifically to the PW (TSSOP-20) package variant including SN74HCT244PWR and SN74HCT244PWRG4.A. Thermal derating is not required within this range.
Does the SN74HCT244PWR support true bidirectional data flow?
No, the SN74HCT244PWR is a unidirectional octal buffer: data flows only from A inputs to Y outputs. It does not support automatic direction sensing or internal bus arbitration. Bidirectional operation requires pairing with complementary devices (e.g., SN74HCT245) or external control logic managing separate OE signals for transmit/receive paths.
Can unused inputs on the SN74HCT244PWR be left floating?
No. All unused inputs on the SN74HCT244PWR must be tied to either VCC or GND to prevent undefined logic states, increased ICC, and potential oscillation. The datasheet explicitly mandates this in Section 8.4.1 and the Implications of Slow or Floating CMOS Inputs application report. Leaving inputs floating violates recommended operating conditions and risks functional failure.
What is the recommended bypass capacitor for the VCC pin of the SN74HCT244PWR?
Texas Instruments recommends a 0.1-µF ceramic capacitor placed as close as possible (<3 mm) to the VCC pin (Pin 20) of the SN74HCT244PWR. This value is specified in Section 8.3 of the datasheet for single-supply devices and is essential to suppress high-frequency switching noise and ensure stable 3-state transitions across the full operating temperature range.
Is the SN74HCT244PWR pin-compatible with the SN74HC244PWR?
No. While both are octal 3-state buffers in TSSOP-20 packages, the SN74HCT244PWR features TTL-compatible inputs (VIH = 2 V min), whereas the SN74HC244PWR uses CMOS thresholds (VIH = 3.15 V min at 5 V). Swapping them may cause logic misreads in systems driven by legacy TTL or 5-V microcontrollers with marginal high-level output voltages.
SN74HCT244PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 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
SN74HCT244PWR FAQ
1.How can I place an order for SN74HCT244PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT244PWR 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 SN74HCT244PWR reliable?
The price and inventory of SN74HCT244PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT244PWR is usually 5 days.
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SN74HCT244PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT244PWR 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 SN74HCT244PWR?
For technical support, including SN74HCT244PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT244PWR requirements.
6.How does Aetrix verify that SN74HCT244PWR is sourced from the original manufacturer or authorized distributors?
All SN74HCT244PWR 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 SN74HCT244PWR meets industry standards.
7.What is the process for return or replacement of SN74HCT244PWR?
All SN74HCT244PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT244PWR, 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 SN74HCT244PWR part is unused and in its original packaging.
Return procedure for SN74HCT244PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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