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Texas Instruments SN74ACT244PWR
- Part No.:
- SN74ACT244PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT244PWR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,966
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Product details
Overview
SN74ACT244PWR from Texas Instruments is an octal non-inverting 3-state buffer/driver IC designed for bus-oriented data transmission, clock distribution, and memory address driving in 5-V TTL-compatible systems. It operates from 4.5 V to 5.5 V, delivers ±24 mA output drive per channel, achieves 9.5 ns maximum propagation delay at 5 V, and supports industrial temperature range (–40°C to +85°C). It is commonly used in LED display drivers and telecom switching networks.
For engineers reviewing the SN74ACT244PWR datasheet, SN74ACT244PWR pinout, SN74ACT244PWR application, or SN74ACT244PWR equivalent, key selection criteria include 3-state output control timing (tPZH/tPLZ ≤ 9.5 ns), input voltage tolerance up to 5.5 V, TTL-compatible input thresholds (VIH = 2 V min), and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The SN74ACT244PWR implements two independent 4-bit buffer sections, each with active-low output-enable (OE) control. Its logic architecture enables simultaneous bidirectional bus isolation: when OE is low, A→Y non-inverted data passes; when OE is high, all Y outputs enter high-impedance state-critical for shared-bus contention management.
It uses ACT (Advanced CMOS TTL-compatible) process technology, delivering rail-to-rail output swing, 2.5 pF typical input capacitance, and 8 pF typical output capacitance. Input transition rate is specified at ≤8 ns/V, and it requires no external pull-up on OE for power-up high-Z behavior if tied to VCC via resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across standard 5-V supply tolerances and brown-out resilience. |
| Max Propagation Delay | 9.5 ns at 5 V - enables reliable timing in high-speed bus interfaces up to ~100 MHz toggle rate. |
| Output Drive | ±24 mA per channel - sufficient to directly drive LEDs or interface with multiple TTL loads without external buffers. |
| Input Compatibility | TTL-compatible (VIH ≥ 2 V, VIL ≤ 0.8 V at 5 V) - allows seamless integration with legacy 5-V logic families. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems and telecom infrastructure equipment. |
| ESD Rating (HBM) | ±3000 V - meets JEDEC JS-001 Class 2, supporting robust handling in automated assembly environments. |
| Quiescent Current | 4 µA max at 5.5 V - minimizes standby power in always-on control subsystems. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, exposed thermal pad (non-electrical), lead-free NiPdAu finish, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable inputs - control respective 4-bit sections; must be pulled high for high-Z state during power-up. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Buffer input terminals - accept TTL-level signals; tolerant to 5.5 V regardless of VCC. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Non-inverting 3-state outputs - drive buses or LEDs; high-Z when corresponding OE is high. |
| 10 | GND | Ground reference - must be low-inductance connection; decoupling capacitor required near pin. |
| 20 | VCC | Power supply - bypassed with 0.1 µF ceramic capacitor placed adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Output Control | Independent active-low OE pins per 4-bit group enable precise bus arbitration and reduce signal contention in multi-driver systems. |
| High-Drive Capability | ±24 mA per output supports direct LED driving (with current-limiting resistors) or fan-out to ≥10 standard TTL loads. |
| Input Overvoltage Tolerance | Inputs rated to 5.5 V allow safe interfacing with mixed-voltage subsystems without level-shifting circuitry. |
| Low Propagation Skew | Matched tPLH/tPHL (≤1 ns variation) ensures deterministic timing across all eight channels in synchronous applications. |
| Industrial Temperature Range | –40°C to +85°C operation validated per JEDEC JESD22-A108, suitable for base station controllers and industrial HMIs. |
Applications
| LED Display Driver | Telecom Switching Network |
|---|---|
Use Scenario: Driving 7-segment or dot-matrix LED displays in industrial panel meters and network equipment front panels. IC Role / Device Role: Non-inverting buffer with 3-state outputs acting as column/segment current sink/source driver. Use Value: ±24 mA drive eliminates need for external transistor arrays; TTL-compatible inputs simplify microcontroller interface. |
Use Scenario: Isolating and buffering control signals between line cards and backplane bus in modular telecom switches. IC Role / Device Role: Bidirectional bus transceiver enabling hot-swap-safe signal routing between distributed modules. Use Value: Independent OE control per 4-bit section allows selective activation, reducing bus contention and EMI during reconfiguration. |
| Memory Address Buffer | Industrial Bus Interface |
Use Scenario: Strengthening and distributing CPU address lines to multiple SRAM or flash memory chips on a shared bus. IC Role / Device Role: High-speed address driver with low skew ensuring setup/hold timing margins across parallel memory interfaces. Use Value: 9.5 ns max tpd maintains timing integrity at 50+ MHz address bus frequencies; 8 pF Co minimizes loading. |
Use Scenario: Interfacing microcontrollers to industrial I/O expansion modules via parallel control/data buses (e.g., ISA-style). IC Role / Device Role: Level-translating and load-driving buffer for 5-V control signals routed over longer PCB traces. Use Value: 4.5–5.5 V VCC range accommodates supply variations; input clamp current rating (±20 mA) protects against transient overvoltage. |
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 |
|---|---|---|---|
| SN74LS244N | Lower drive (±15 mA), slower (tPD ≈ 25 ns), bipolar TTL process, higher ICC (40 mA typ) | Legacy 5-V systems where speed is secondary and power budget permits higher quiescent draw | Choose only if backward compatibility with LS-family timing and voltage thresholds is mandatory. |
| SN74LVC244APWR | 3.3-V only (1.65–3.6 V), lower drive (±24 mA), faster (tPD ≈ 5.2 ns), CMOS input thresholds | New designs using 3.3-V microcontrollers or FPGAs requiring level translation and lower power | Select when migrating to modern low-voltage logic; requires external level shifters for 5-V interface. |
Compared with SN74LS244N, SN74ACT244PWR offers 2.6× faster propagation and 60% lower static power; versus SN74LVC244APWR, it provides native 5-V operation and input overvoltage tolerance-critical for mixed-signal industrial backplanes.
Availability
SN74ACT244PWR is available at Aetrix Electronics and suitable for LED display drivers, telecom switching networks, and industrial bus interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ACT244PWR 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 connectivity technologies, with decades of experience in high-reliability logic and interface solutions.
The SN74ACT244PWR belongs to TI's ACT family of TTL-compatible CMOS logic devices, engineered for high-speed, low-power 5-V digital systems in industrial, telecom, and computing infrastructure.
FAQ
What is the maximum operating voltage for SN74ACT244PWR?
The SN74ACT244PWR has an absolute maximum VCC rating of 7 V, but its recommended operating range is strictly 4.5 V to 5.5 V per TI's SCAS517G datasheet. Operation outside this window may cause timing violations, increased ICC, or reduced reliability. The device's inputs tolerate up to 5.5 V regardless of VCC, supporting mixed-voltage signal injection.
Does SN74ACT244PWR support hot-swap bus isolation?
Yes, SN74ACT244PWR supports hot-swap isolation via its dual active-low output-enable (OE) inputs. When either OE is held high, its associated four outputs enter high-impedance state-preventing signal contention during live insertion/removal of modules. TI recommends tying OE to VCC through a pull-up resistor (e.g., 10 kΩ) to ensure defined high-Z at power-up.
Can SN74ACT244PWR directly drive LEDs without external current-limiting components?
No, SN74ACT244PWR cannot drive LEDs without external current-limiting resistors. While it sources/sinks up to ±24 mA per output, LED forward voltage and desired brightness require precise current control. TI's application note confirms use of 1-kΩ resistors at 5 V to limit current to <5 mA-ensuring safe operation within both LED and SN74ACT244PWR output specifications.
What is the thermal resistance (RθJA) of SN74ACT244PWR in its TSSOP-20 package?
The SN74ACT244PWR in TSSOP-20 (PW) package has a junction-to-ambient thermal resistance (RθJA) of 126.2 °C/W, as measured under JEDEC JESD51-2 conditions (single-layer board, 1 in² copper). This value assumes proper PCB layout with thermal vias under the exposed pad; actual performance improves with enhanced copper area and airflow.
How does SN74ACT244PWR differ from SN74ACT244DW in functionality?
SN74ACT244PWR and SN74ACT244DW share identical electrical specifications, pinout, and logic function-the only difference is package: PW is TSSOP-20 (lead pitch 0.65 mm), while DW is SOIC-20 (lead pitch 1.27 mm). Both operate from 4.5–5.5 V, deliver ±24 mA, and support –40°C to +85°C. The PW variant enables higher PCB density; DW offers easier hand-soldering and prototyping.
SN74ACT244PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74ACT244PWR FAQ
1.How can I place an order for SN74ACT244PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244PWR 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 SN74ACT244PWR reliable?
The price and inventory of SN74ACT244PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244PWR is usually 5 days.
3.What payment methods are accepted for SN74ACT244PWR?
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4.How is shipping managed for SN74ACT244PWR?
SN74ACT244PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244PWR 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 SN74ACT244PWR?
For technical support, including SN74ACT244PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244PWR requirements.
6.How does Aetrix verify that SN74ACT244PWR is sourced from the original manufacturer or authorized distributors?
All SN74ACT244PWR 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 SN74ACT244PWR meets industry standards.
7.What is the process for return or replacement of SN74ACT244PWR?
All SN74ACT244PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244PWR, 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 SN74ACT244PWR part is unused and in its original packaging.
Return procedure for SN74ACT244PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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