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Texas Instruments SN74ACT244PWE4
- Part No.:
- SN74ACT244PWE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT244PWE4.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,712
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Product details
Overview
SN74ACT244PWE4 from Texas Instruments is an octal 3-state buffer/driver IC designed for bus-oriented data transmission, clock distribution, and memory address driving in 5-V TTL-compatible systems. It features dual 4-bit channels with independent active-low output enables (1OE, 2OE), 4.5–5.5 V supply operation, ≤9.5 ns propagation delay at 5 V, and ±24 mA output drive per channel - enabling robust signal buffering in LED display drivers and telecom switching networks.
For engineers reviewing the SN74ACT244PWE4 datasheet, SN74ACT244PWE4 pinout, SN74ACT244PWE4 application, or SN74ACT244PWE4 equivalent, key selection criteria include its 20-pin TSSOP package, TTL-compatible inputs, high-drive 3-state outputs, thermal performance (RθJA = 126.2 °C/W), and compatibility with industrial temperature range (–40°C to +85°C) designs.
Technical Context
The SN74ACT244PWE4 implements two independent 4-bit non-inverting buffer sections, each controlled by a dedicated active-low output-enable input (1OE, 2OE). When OE is low, A-inputs pass directly to Y-outputs; when high, outputs enter high-impedance state - enabling bidirectional bus control without external logic.
It operates strictly within 4.5–5.5 V VCC, accepts input voltages up to 5.5 V, and delivers guaranteed VOH ≥ 3.76 V and VOL ≤ 0.44 V at IOL/IOH = ±24 mA and 5.5 V, meeting TTL voltage thresholds across the full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across standard 5-V rail tolerances and brown-out resilience. |
| tpd (Max) | 9.5 ns at 5 V - supports >100 MHz bus toggle rates in high-speed digital interfaces. |
| IOH / IOL | ±24 mA per output - drives multiple TTL loads or LEDs directly with current-limiting resistors. |
| VIH / VIL | 2.0 V / 0.8 V at 5 V - guarantees reliable recognition of TTL-level logic signals without level shifting. |
| Output State | 3-state (Hi-Z) enabled by active-low OE - allows time-multiplexed sharing of common buses or traces. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and telecom equipment deployment. |
| ESD Rating (HBM) | ±3000 V - exceeds JEDEC JS-001 Class 2, supporting safe handling in standard assembly environments. |
Pinout & Package
Packaged in a 20-pin TSSOP (PW), the SN74ACT244PWE4 measures 6.5 mm × 4.4 mm with 0.65 mm pitch, optimized for high-density PCB layouts and automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable inputs - independently disable Channel 1 (pins 2–9) or Channel 2 (pins 11–18). |
| 2, 4, 6, 8 | 1A1–1A4 | Channel 1 input pins - accept TTL-compatible signals routed to corresponding Y outputs when 1OE = L. |
| 3, 5, 7, 9 | 2Y4–2Y1 | Channel 2 output pins - driven by 2A inputs (pins 11,13,15,17) when 2OE = L; Hi-Z otherwise. |
| 10 | GND | Ground reference - must be low-impedance connection to minimize noise coupling and ensure valid logic thresholds. |
| 11,13,15,17 | 2A1–2A4 | Channel 2 input pins - feed signals to 2Y outputs (pins 3,5,7,9) under control of 2OE. |
| 12,14,16,18 | 1Y1–1Y4 | Channel 1 output pins - mirror 1A inputs (pins 2,4,6,8) when 1OE = L; tri-stated when 1OE = H. |
| 20 | VCC | Positive supply - requires local 0.1 µF ceramic bypass capacitor placed adjacent to pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | Accepts 0–5.5 V input range and meets VIH ≥ 2.0 V / VIL ≤ 0.8 V at 5 V - eliminates need for level translators in mixed-logic systems. |
| High-Drive Outputs | Delivers ±24 mA per channel at 5.5 V - sufficient to sink/source LED currents or drive multiple 74ACT loads without buffers. |
| Low Propagation Delay | tpd ≤ 9.5 ns at 5 V - enables use in 100+ MHz clock distribution and address/data latching paths. |
| Independent 3-State Control | Dual OE pins allow selective isolation of either 4-bit channel - critical for multiplexed bus arbitration and hot-swap signaling. |
| Industrial Temperature Range | Specified from –40°C to +85°C - supports deployment in base stations, industrial controllers, and network infrastructure hardware. |
Applications
| LED Display Driver | Telecom Switching Network |
|---|---|
Use Scenario: Driving 7-segment or dot-matrix LED displays in industrial HMIs and telecom rack indicators. IC Role / Device Role / Timing Role: Acts as current-sinking buffer between microcontroller GPIO and LED anodes/cathodes, with OE used for digit multiplexing. Use Value: ±24 mA drive capability allows direct LED control using 1-kΩ current-limiting resistors at 5 V, reducing BOM count and board space. |
Use Scenario: Isolating and regenerating control signals across backplane slots in modular telecom switches. IC Role / Device Role / Timing Role: Buffers address/control lines between line cards and central switch fabric, with OE synchronized to slot enable signals. Use Value: 9.5 ns tpd and 3-state outputs prevent bus contention during hot-insertion and support deterministic timing margins. |
| Memory Address Buffer | Industrial Bus Transceiver |
Use Scenario: Strengthening address lines from microcontrollers to parallel SRAM or Flash memory in PLCs and motion controllers. IC Role / Device Role / Timing Role: Non-inverting buffer amplifying weak address signals while maintaining setup/hold timing integrity. Use Value: Low input capacitance (2.5 pF) and fast edge rates preserve signal integrity on long traces, reducing timing skew. |
Use Scenario: Interfacing FPGA I/O banks to legacy 5-V parallel buses in factory automation I/O modules. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer for bidirectional data/control lines, with OE managing direction control. Use Value: TTL-compatible inputs accept FPGA 3.3-V LVTTL outputs via internal clamping, eliminating external level shifters. |
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 | 3.3-V only (1.65–3.6 V), lower drive (±24 mA @ 3.3 V), higher speed (tPD ≈ 5.2 ns), CMOS inputs. | Requires level translation for 5-V systems; unsuitable for direct replacement in legacy 5-V designs. | Select when migrating to 3.3-V systems with tighter timing budgets and lower power constraints. |
| 74ACT244SCX | Same ACT family, identical specs, but in SOIC-20 (N package); RθJA = 48.1 °C/W vs. 126.2 °C/W for PW. | Better thermal performance in low-airflow environments; larger footprint limits high-density routing. | Prefer for thermally constrained industrial enclosures where board area is less critical than junction temperature rise. |
Compared with SN74LVC244APWR and 74ACT244SCX, the SN74ACT244PWE4 uniquely balances 5-V TTL compatibility, industrial temperature rating, and compact TSSOP packaging - making it optimal for retrofitting legacy 5-V bus systems without redesigning power or layout.
Availability
SN74ACT244PWE4 is available at Aetrix Electronics and suitable for LED display drivers, telecom switching networks, and industrial bus transceivers requiring stable component supply and long-term production continuity.
Supply support for SN74ACT244PWE4 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 SN74ACT244PWE4 belongs to TI's advanced CMOS (ACT) logic portfolio, engineered for high-speed, low-noise 5-V digital interfacing in industrial, telecom, and computing infrastructure.
FAQ
What is the maximum operating voltage for SN74ACT244PWE4?
The SN74ACT244PWE4 has an absolute maximum VCC rating of 7 V, but its recommended operating range is strictly 4.5 V to 5.5 V. Operation outside this window may cause timing violations, increased ICC, or reduced noise margin. The SN74ACT244PWE4 is not rated for 3.3-V operation and lacks internal level-shifting circuitry.
Does SN74ACT244PWE4 support hot-swap or live insertion?
The SN74ACT244PWE4 does not include built-in hot-swap protection, but its 3-state outputs and high-impedance disable mode (via OE) enable safe bus isolation during insertion. To implement live insertion, tie OE to VCC through a pullup resistor and ensure power sequencing places VCC before signal inputs - as specified in Section 7.1 of the SN74ACT244PWE4 datasheet.
Can SN74ACT244PWE4 drive LEDs directly?
Yes - the SN74ACT244PWE4 can drive LEDs directly in sink or source configuration. At 5.5 V VCC and IOL = 24 mA, VOL remains ≤ 0.44 V, allowing a 1-kΩ series resistor to limit current to ~4.6 mA per LED. Ensure total device ICC stays within 200 mA and observe thermal limits given its RθJA = 126.2 °C/W in TSSOP.
What is the input voltage tolerance of SN74ACT244PWE4?
The SN74ACT244PWE4 inputs tolerate voltages from –0.5 V to VCC + 0.5 V, with guaranteed TTL-compatible thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at 5 V). Inputs are not 5.5-V tolerant when VCC < 5.5 V - applying 5.5 V to an input while VCC = 4.5 V risks exceeding IVI limits and triggering clamp diode conduction.
How does SN74ACT244PWE4 differ from SN74ACT244N?
The SN74ACT244PWE4 uses a 20-pin TSSOP (PW) package with 0.65 mm pitch and RθJA = 126.2 °C/W, while SN74ACT244N uses a 20-pin PDIP (N) package with 2.54 mm pitch and RθJA = 48.1 °C/W. Both share identical logic function, timing, and electrical specs, but SN74ACT244PWE4 targets surface-mount, high-density designs; SN74ACT244N suits through-hole prototyping and legacy repair.
SN74ACT244PWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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
SN74ACT244PWE4 FAQ
1.How can I place an order for SN74ACT244PWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244PWE4 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 SN74ACT244PWE4 reliable?
The price and inventory of SN74ACT244PWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244PWE4 is usually 5 days.
3.What payment methods are accepted for SN74ACT244PWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244PWE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244PWE4?
SN74ACT244PWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244PWE4 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 SN74ACT244PWE4?
For technical support, including SN74ACT244PWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244PWE4 requirements.
6.How does Aetrix verify that SN74ACT244PWE4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT244PWE4 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 SN74ACT244PWE4 meets industry standards.
7.What is the process for return or replacement of SN74ACT244PWE4?
All SN74ACT244PWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244PWE4, 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 SN74ACT244PWE4 part is unused and in its original packaging.
Return procedure for SN74ACT244PWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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