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Texas Instruments SN74HC244PWT
- Part No.:
- SN74HC244PWT
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC244PWT.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,405
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Product details
Overview
SN74HC244PWT from Texas Instruments is an octal noninverting 3-state buffer/line driver IC, organized as two independent 4-bit banks with separate output-enable (OE) controls. It operates from 2V to 6V, delivers ±6mA output drive at 5V, exhibits typical propagation delay of 11ns (VCC = 6V, CL = 50pF), and draws ≤80µA ICC (max). It is used in bus-oriented memory address driving, clock distribution, and I/O expansion in industrial control and telecom infrastructure.
For engineers reviewing the SN74HC244PWT datasheet, SN74HC244PWT pinout, SN74HC244PWT application, or SN74HC244PWT equivalent, this page provides verified functional identity, TSSOP-20 package mapping, bank-level 3-state control behavior, voltage-tolerant CMOS input compatibility, and validated alternative options for bus buffering in high-density PCB designs.
Technical Context
The SN74HC244PWT implements two independent 4-bit noninverting buffer banks, each controlled by its own OE input (1OE on Pin 1, 2OE on Pin 19). When OE is low, corresponding Y outputs replicate A inputs; when OE is high, outputs enter high-impedance state-enabling bidirectional bus sharing without contention.
It uses standard CMOS inputs with ≤10pF input capacitance and ≤1µA input leakage, requiring defined VIH/VIL thresholds (e.g., VIH ≥ 3.15V at VCC = 4.5V) and fast input transitions (≤500 ns/V at 4.5V) to prevent oscillation or excess current draw.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - supports mixed-voltage system interfacing (e.g., 3.3V MCU to 5V peripheral bus) |
| Output Drive Strength | ±6mA at VCC = 4.5V - sufficient to drive 15 LSTTL loads or terminate short PCB traces without external buffers |
| Propagation Delay (tpd) | 11ns typical (VCC = 6V, CL = 50pF) - enables reliable operation in 30+ MHz bus timing windows |
| Quiescent Current (ICC) | 8µA max at VCC = 6V, TA = 25°C - ensures ultra-low static power in always-on I/O expander stages |
| 3-State Enable/Disable Time | 13ns typical ten/tdis (VCC = 6V, CL = 50pF) - allows rapid bus arbitration with minimal glitch window during OE transitions |
| Input Leakage Current | ±100nA max (VCC = 6V, TA = 25°C) - permits high-impedance input termination with ≥100kΩ pull-ups without voltage shift |
| Operating Temperature | –40°C to +125°C - qualified for extended industrial and telecom infrastructure environments |
Pinout & Package
Packaged in a 20-pin TSSOP (PW), SN74HC244PWT measures 6.5mm × 6.4mm body size with 0.65mm lead pitch, optimized for high-density routing and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low bank enable inputs - control high-impedance state for respective 4-bit output groups |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Noninverting input terminals - accept CMOS-level signals from microcontrollers or FPGAs |
| 18, 16, 14, 12, 9, 7, 5, 3 | 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs - drive bus lines or memory address registers with controlled sourcing/sinking |
| 10 | GND | Ground reference - must be low-impedance return path for all output currents and bypass capacitors |
| 20 | VCC | Power supply - requires local 0.1µF ceramic bypass capacitor placed adjacent to pin per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-bank 3-state control | Enables selective bus isolation: one bank can drive while the other remains high-Z, preventing contention in multi-master systems |
| High-output-current drive (±6mA @ 4.5V) | Eliminates need for external line drivers when interfacing to moderate-capacitance buses (<30pF) or LED segment drivers |
| Ultra-low ICC (8µA max) | Reduces standby power in always-on I/O expanders or hot-swap controller interface logic |
| Wide 2V–6V supply range | Permits direct interfacing between 2.5V, 3.3V, and 5V logic domains without level shifters |
| CMOS-compatible input thresholds | VIH = 3.15V min at 4.5V VCC ensures robust noise margin against 3.3V MCU outputs in mixed-voltage designs |
Applications
| Memory Address Buffering | Industrial I/O Expansion |
|---|---|
|
Use Scenario: Driving 16-bit address bus from a microcontroller to multiple SRAM or flash devices on a shared memory bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer that isolates address lines during bus arbitration and enables clean signal edge integrity over 5–10 cm traces. Use Value: Prevents address bus contention during multi-chip select cycles; ±6mA drive sustains logic levels across 20pF trace + load capacitance. |
Use Scenario: Expanding GPIO count of a PLC CPU to control 8 discrete solenoids or sensors via parallel interface. IC Role / Device Role / Timing Role: Level-translating, current-boosting buffer between 3.3V FPGA I/O and 5V industrial field wiring. Use Value: 2V–6V supply range allows direct 5V operation; 125°C rating supports enclosure mounting near heat-generating power modules. |
| Telecom Backplane Interface | LED Display Row Driver |
|
Use Scenario: Interfacing packet processor ASIC outputs to backplane data lanes in a modular network switch chassis. IC Role / Device Role / Timing Role: High-speed bus driver with matched propagation delay across all 8 channels to maintain skew <1ns. Use Value: 11ns typical tpd (6V/50pF) meets 30MHz backplane timing budgets; TSSOP-20 footprint minimizes board area vs. SOIC. |
Use Scenario: Driving common-anode rows of a 16×16 LED matrix in a digital signage controller. IC Role / Device Role / Timing Role: Sourcing current to LED rows while enabling blanking via OE-controlled high-Z state. Use Value: ±6mA per output supports 5mA LED segments; independent OE pins allow row-by-row PWM dimming without external transistors. |
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 |
|---|---|---|---|
| SN74HCT244PW | TTL-compatible inputs (VIH ≈ 2V), identical pinout and 3-state function; slightly higher ICC (≤40µA) | Better suited for legacy 5V TTL system integration where input noise immunity >400mV is required | Select when interfacing directly to 5V TTL outputs without level translation |
| 74LVC244APW | Lower VCC range (1.65V–3.6V), faster tpd (5.1ns typ @ 3.3V), but reduced drive (±24mA) and narrower temp range (–40°C to +125°C) | Optimized for modern low-voltage FPGA/CPU I/O expansion, not 5V bus interfaces | Prefer for 3.3V-only systems needing sub-6ns timing and lower power; avoid for 5V operation |
Compared with SN74HC244PWT, SN74HCT244PW offers guaranteed TTL input compatibility at 5V but trades off some quiescent current efficiency, while 74LVC244APW delivers superior speed and density in 3.3V domains but lacks 5V tolerance-making SN74HC244PWT the optimal choice for mixed-voltage, industrial-grade bus buffering.
Availability
SN74HC244PWT is available at Aetrix Electronics and suitable for industrial control systems, telecom infrastructure equipment, and LED display controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HC244PWT 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 industry-standard logic families.
The SN74HC244PWT belongs to TI's HC (High-Speed CMOS) logic family, designed for low-power, wide-supply-range buffering and bus interfacing in industrial, automotive, and communications equipment.
FAQ
What is the maximum operating temperature for SN74HC244PWT?
The SN74HC244PWT is rated for operation from –40°C to +125°C, making it suitable for deployment in harsh industrial enclosures or telecom base station hardware where ambient temperatures exceed 85°C. This specification is confirmed in Section 5.3 of the official TI datasheet (SCLS130I, Rev. February 2026).
Does SN74HC244PWT support 3.3V logic interfacing?
Yes, SN74HC244PWT fully supports 3.3V operation: its recommended VCC range includes 3.3V, VIH is 2.31V min (at VCC = 3.3V), and VOL remains ≤0.26V at 6mA sink - ensuring reliable interfacing with 3.3V microcontrollers and FPGAs without level shifters.
Can SN74HC244PWT drive LEDs directly?
SN74HC244PWT can source or sink up to ±6mA per output at 4.5V, which is sufficient for low-current indicator LEDs (e.g., 2–5mA segments). However, it is not intended for high-brightness or high-current LED arrays; dedicated LED drivers are recommended for >10mA loads or PWM dimming above 1kHz.
What is the pinout configuration for SN74HC244PWT?
SN74HC244PWT uses a 20-pin TSSOP (PW) package with standardized pin assignment: Pins 1 and 19 are 1OE and 2OE; Pins 2/4/6/8 and 11/13/15/17 are A inputs; Pins 18/16/14/12 and 9/7/5/3 are Y outputs; Pin 10 is GND; Pin 20 is VCC - matching TI's DB/DW/N/NS/PW package diagrams.
Is SN74HC244PWT RoHS compliant?
Yes, SN74HC244PWT is RoHS compliant and lead-free, as confirmed in TI's Packaging Information (Orderable Part Number SN74HC244PWT, status Active, Lead finish: NiPdAu, MSL rating: Level-1, Peak reflow: 260°C).
SN74HC244PWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74HC244PWT FAQ
1.How can I place an order for SN74HC244PWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC244PWT 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 SN74HC244PWT reliable?
The price and inventory of SN74HC244PWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC244PWT is usually 5 days.
3.What payment methods are accepted for SN74HC244PWT?
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4.How is shipping managed for SN74HC244PWT?
SN74HC244PWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC244PWT 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 SN74HC244PWT?
For technical support, including SN74HC244PWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC244PWT requirements.
6.How does Aetrix verify that SN74HC244PWT is sourced from the original manufacturer or authorized distributors?
All SN74HC244PWT 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 SN74HC244PWT meets industry standards.
7.What is the process for return or replacement of SN74HC244PWT?
All SN74HC244PWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC244PWT, 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 SN74HC244PWT part is unused and in its original packaging.
Return procedure for SN74HC244PWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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