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Texas Instruments SN74ACT244PW
- Part No.:
- SN74ACT244PW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT244PW.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
SN74ACT244PW from Texas Instruments is an octal 3-state non-inverting 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 input voltages up to 5.5 V - enabling robust interfacing with mixed-voltage logic domains in industrial control backplanes.
For engineers reviewing the SN74ACT244PW datasheet, SN74ACT244PW pinout, SN74ACT244PW application, or SN74ACT244PW equivalent, this page provides verified functional specifications, validated TSSOP-20 pin mapping, confirmed 3-state bus-driving use cases, and two technically documented alternative parts with explicit parameter and application differences.
Technical Context
The SN74ACT244PW implements two independent 4-bit buffer sections, each with dedicated active-low output-enable (OE) inputs controlling high-impedance state entry/exit. Its TTL-compatible inputs accept 2 V minimum VIH at 5 V VCC, while outputs maintain rail-to-rail swing with VOH ≥ 3.76 V and VOL ≤ 0.44 V under 24 mA load.
Switching behavior is characterized by tPLH/tPHL ≤ 10 ns and enable/disable transitions (tPZH/tPZL/tPHZ/tPLZ) ≤ 10.5 ns at 5 V, supporting reliable operation in synchronous bus architectures requiring fast bidirectional data gating without latch-up risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V logic rails and tolerance to supply ripple in industrial power environments. |
| Max Propagation Delay | 9.5 ns at 5 V - enables reliable timing closure in high-speed address/data buses operating up to ~100 MHz. |
| Output Drive | ±24 mA per channel - sufficient to directly drive LEDs, terminate 50-Ω lines, or fan out to ≥10 standard TTL loads. |
| Input Voltage Range | 0 V to 5.5 V - allows safe interfacing with overvoltage-tolerant peripherals without external level-shifting circuitry. |
| 3-State Enable Logic | Active-low OE with Hi-Z output when high - supports wired-OR bus arbitration and prevents contention during power sequencing. |
| Operating Temperature | –40 °C to +85 °C - qualified for commercial and industrial ambient conditions without derating. |
| ESD Rating (HBM) | ±2000 V - meets JEDEC JS-001 Class 2 requirements for handling in standard manufacturing environments. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, exposed pad optional, RoHS-compliant lead finish (NIPDAU/SN), MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable inputs - assert logic high to place respective 4-bit section into high-impedance state. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Non-inverting input terminals - pass through data unchanged when corresponding OE is low. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Buffered non-inverting outputs - driven low/high per input state when OE is low; tri-stated when OE is high. |
| 10 | GND | Ground reference - must be connected to system common plane; decoupling capacitor required within 5 mm. |
| 20 | VCC | Positive supply - requires local 0.1 µF ceramic bypass capacitor between VCC and GND adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | VIH = 2.0 V min at 5 V VCC - eliminates need for external level shifters when interfacing with legacy 5-V microcontrollers or FPGAs. |
| High-Drive Outputs | 24 mA sink/source capability - supports direct LED driving with single-series resistor or termination of unterminated stubs in parallel bus topologies. |
| Fast 3-State Enable | tPZH/tPZL ≤ 9.5 ns - minimizes bus turnaround time in half-duplex communication protocols like I²C expanders or shared memory access controllers. |
| Rail-to-Rail Output Swing | VOH ≥ 3.76 V / VOL ≤ 0.44 V at 24 mA - ensures noise margins > 0.7 V in 5-V CMOS/TTL systems, reducing false triggering in noisy industrial settings. |
| Overvoltage-Tolerant Inputs | Accepts VI up to 5.5 V - permits safe connection to 5-V signals even when VCC is ramping during power-up or brownout conditions. |
Applications
| Industrial Backplane Bus Driver | LED Segment Display Controller |
|---|---|
|
Use Scenario: Driving multiplexed 7-segment displays in programmable logic controllers with shared digit select lines. IC Role / Device Role / Timing Role: Octal buffer isolates MCU GPIO pins from display current loads while enabling rapid digit scanning via independent OE control. Use Value: Eliminates external transistor arrays; 24-mA per-channel drive supports bright LED segments without series resistors exceeding 200 Ω at 5 V. |
Use Scenario: Buffering address lines between FPGA and SRAM in embedded test equipment with strict timing budgets. IC Role / Device Role / Timing Role: Non-inverting 3-state driver provides clean, low-skew address propagation with controlled bus release during memory read/write cycles. Use Value: 9.5 ns max tpd ensures setup/hold timing margin for 100-MHz SRAM access; Hi-Z state prevents address bus contention during DMA transfers. |
| Telecom Line Card Interface | Server Baseboard Management Bus |
|
Use Scenario: Level-shifting and buffering control signals between ASIC and hot-swap PMBus controllers on line cards. IC Role / Device Role / Timing Role: Voltage-tolerant input stage accepts 5-V ASIC outputs while driving 5-V PMBus transceivers with precise edge control. Use Value: Input overvoltage rating (5.5 V) protects against transient coupling on densely routed PCBs; 20-pin TSSOP fits space-constrained card layouts. |
Use Scenario: Isolating IPMI command signals between BMC and peripheral sensors in 1U server chassis. IC Role / Device Role / Timing Role: Dual 4-bit section allows independent enable control for sensor alert lines and configuration register reads. Use Value: Separate OE pins permit selective bus partitioning - one section drives temperature sensors while the other handles voltage monitor alerts without cross-talk. |
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 |
|---|---|---|---|
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V), 24 mA drive, 3.3-V logic only; no 5-V tolerance. | Requires level translation when interfacing with 5-V systems; unsuitable for mixed-voltage backplanes. | Select only for pure 3.3-V designs where lower power and smaller footprint justify loss of 5-V compatibility. |
| 74ACT244SCX | Same ACT family, SOIC-20 package; identical electrical specs but larger 7.5-mm body and 2.54-mm pitch. | Direct PCB replacement only if layout accommodates SOIC-20; not pin-compatible with TSSOP-20 due to different pad geometry. | Choose for manual assembly, prototyping, or legacy board rework where TSSOP reflow is unavailable. |
Compared with SN74ACT244PW, SN74LVC244APWR reduces supply voltage flexibility but cuts dynamic power by >60% in 3.3-V systems, while 74ACT244SCX preserves full electrical equivalence at the cost of increased board area and thermal resistance (RθJA = 101.2 °C/W vs. 126.2 °C/W).
Availability
SN74ACT244PW is available at Aetrix Electronics and suitable for industrial backplane bus drivers, LED segment display controllers, telecom line card interfaces, and server baseboard management buses requiring stable component supply across extended production lifecycles.
Supply support for SN74ACT244PW 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 50 years of innovation in high-reliability interface and signal-chain components.
The SN74ACT244PW belongs to TI's ACT (Advanced CMOS Technology) logic family, engineered for high-speed, low-noise 5-V digital interfacing in industrial, telecom, and computing infrastructure where robustness and timing precision are critical.
FAQ
What is the maximum operating temperature for the SN74ACT244PW?
The SN74ACT244PW is rated for operation from –40 °C to +85 °C ambient temperature. This range is validated per TI's recommended operating conditions and applies to the PW (TSSOP-20) package variant specifically. Thermal derating is not required within this span, and junction temperature remains within safe limits given typical PCB copper area and airflow in industrial enclosures.
Does the SN74ACT244PW support 3.3-V input logic levels?
No, the SN74ACT244PW does not reliably recognize 3.3-V logic-high inputs. Its VIH minimum is 2.0 V at 5 V VCC, but it is designed for TTL-compatible 5-V systems - inputs below 2.0 V may result in undefined output states. For 3.3-V interface, SN74LVC244APWR or level-shifting circuitry is required.
Can the SN74ACT244PW drive LEDs directly without current-limiting resistors?
No, the SN74ACT244PW must always use external current-limiting resistors when driving LEDs. Its absolute maximum output current is ±50 mA per pin, but continuous operation above ±24 mA violates recommended conditions. A 220-Ω resistor at 5 V limits current to ~22.7 mA - within spec and avoids thermal stress on the SN74ACT244PW die.
Is the SN74ACT244PW pin-compatible with the SN74HC244N?
No, the SN74ACT244PW is not pin-compatible with SN74HC244N. While both are octal 3-state buffers in 20-pin packages, SN74HC244N uses PDIP-20 (N package) with 2.54-mm pitch and different pin numbering. The SN74ACT244PW uses TSSOP-20 (PW package) with 0.65-mm pitch and distinct mechanical layout - requiring PCB redesign for substitution.
What is the purpose of the two separate OE pins on the SN74ACT244PW?
The two active-low OE pins (1OE and 2OE) independently control the output state of each 4-bit buffer section. This allows partial bus isolation - for example, holding one group of signals static while updating another - which is essential in multi-master systems, memory-mapped I/O, and fault-containment architectures where granular signal gating improves system reliability.
SN74ACT244PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- 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
SN74ACT244PW FAQ
1.How can I place an order for SN74ACT244PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244PW 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 SN74ACT244PW reliable?
The price and inventory of SN74ACT244PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244PW is usually 5 days.
3.What payment methods are accepted for SN74ACT244PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244PW?
SN74ACT244PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244PW 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 SN74ACT244PW?
For technical support, including SN74ACT244PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244PW requirements.
6.How does Aetrix verify that SN74ACT244PW is sourced from the original manufacturer or authorized distributors?
All SN74ACT244PW 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 SN74ACT244PW meets industry standards.
7.What is the process for return or replacement of SN74ACT244PW?
All SN74ACT244PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244PW, 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 SN74ACT244PW part is unused and in its original packaging.
Return procedure for SN74ACT244PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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