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Texas Instruments SN74ACT244PWG4
- Part No.:
- SN74ACT244PWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT244PWG4.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,864
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Product details
Overview
SN74ACT244PWG4 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 digital systems. It features dual 4-bit channels with independent active-low output-enable (OE) controls, 9.5 ns maximum propagation delay at 5 V, ±24 mA output drive capability, and operation across 4.5 V to 5.5 V supply range. It is commonly used in server backplanes and telecom switching networks requiring high-drive, low-skew signal buffering.
For engineers reviewing the SN74ACT244PWG4 datasheet, SN74ACT244PWG4 pinout, SN74ACT244PWG4 application, or SN74ACT244PWG4 equivalent, this page delivers verified functional specifications, TSSOP-20 package details, real-world timing behavior, and validated alternative options - all grounded in TI's SCAS517G production datasheet (March 2024 revision).
Technical Context
The SN74ACT244PWG4 implements two independent 4-bit non-inverting buffer sections, each controlled by a dedicated active-low OE input. Its TTL-compatible inputs accept 2 V minimum VIH at 5 V VCC, enabling direct interfacing with legacy 5-V logic families without level translation.
Each output supports 3-state operation with guaranteed high-impedance isolation when OE is asserted high, and delivers rail-to-rail swing with VOH ≥ 3.76 V and VOL ≤ 0.44 V under 24 mA load at 5 V. Propagation delays are tightly specified: tPLH/tPHL ≤ 10 ns, tPZH/tPHZ ≤ 10.5 ns, ensuring deterministic timing in synchronous bus architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5-V supply tolerances and brown-out resilience. |
| Max Propagation Delay | 9.5 ns at 5 V - Enables reliable 100+ MHz bus operation with margin for trace routing and fanout. |
| Output Drive | ±24 mA per channel - Sufficient to directly drive LEDs, terminated transmission lines, or multiple TTL inputs without external buffers. |
| Input Compatibility | TTL-compatible (VIH = 2 V min, VIL = 0.8 V max at 5 V) - Allows seamless integration with legacy 74LS/74F logic without interface circuitry. |
| 3-State Leakage | ±2.5 µA at VCC = 5.5 V - Minimizes bus contention current and power loss during high-impedance mode in shared-bus systems. |
| Operating Temperature | –40 °C to +85 °C - Qualified for commercial and industrial ambient environments including telecom equipment and embedded controllers. |
| ESD Rating (HBM) | ±3000 V - Meets JEDEC JS-001 Class 2 requirements, supporting robust handling in standard manufacturing environments. |
Pinout & Package
TSSOP-20 (PW) package: 20-pin thin shrink small-outline package with 0.65 mm pitch, 6.5 mm × 4.4 mm body, and exposed thermal pad (RKS variant differs; PW does not include thermal pad). Designed for high-density PCB layouts with hand-soldering and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable for Channel A (pins 1–8) and Channel B (pins 11–18); asserts high-Z state when logic high. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Eight buffered inputs - non-inverting data sources for respective Y outputs. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Eight 3-state outputs - driven low/high when corresponding OE is low; high-Z otherwise. |
| 10 | GND | Ground reference for all logic and I/O; must be low-impedance connection to minimize noise coupling. |
| 20 | VCC | Primary 4.5–5.5 V power supply; requires local 0.1 µF bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-channel control | Separate 1OE and 2OE pins allow selective enabling of Channel A (pins 1–8) and Channel B (pins 11–18), enabling flexible bus partitioning and power-gating. |
| High-current 3-state outputs | ±24 mA drive per output ensures robust signal integrity into 50 Ω traces or multiple TTL loads without external drivers. |
| TTL-compatible input thresholds | VIH = 2.0 V min and VIL = 0.8 V max at 5 V VCC guarantee interoperability with 74LS, 74F, and other legacy 5-V logic families. |
| Low propagation skew | Matched tPLH/tPHL ≤ 10 ns across all eight outputs enables precise timing alignment in parallel data paths and clock distribution trees. |
| Controlled power-up behavior | OE pins default to high-impedance state on power ramp; tying OE to VCC via pullup resistor prevents bus contention during boot. |
Applications
| Server Backplane Buffering | Telecom Line Card Interface |
|---|---|
Use Scenario: Driving parallel address/data buses between CPU modules and memory or I/O expansion slots in rack-mounted servers. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing isolation and fanout amplification for multiplexed control signals and address lines. Use Value: ±24 mA drive sustains signal integrity over 10+ inch FR4 traces; 9.5 ns tpd supports >100 MHz synchronous transfers with setup/hold margin. |
Use Scenario: Interfacing FPGA-based packet processors with legacy PHY devices on telecom line cards operating at 5 V. IC Role / Device Role / Timing Role: Level-shifting and bus-driving interface between modern low-voltage logic and legacy 5-V peripherals. Use Value: TTL-compatible inputs eliminate need for discrete level translators; independent OE control allows dynamic bus arbitration between multiple masters. |
| Industrial PLC I/O Expansion | LED Segment Driver |
Use Scenario: Expanding digital I/O capacity in programmable logic controllers using isolated 5-V field-side buses. IC Role / Device Role / Timing Role: Signal repeater and voltage-level translator for opto-isolated input/output modules. Use Value: Guaranteed 4.5–5.5 V operation accommodates wide industrial supply variation; ±2.5 µA 3-state leakage prevents false triggering on shared bus lines. |
Use Scenario: Direct segment driving for 7-segment LED displays in instrumentation panels and HMI front-ends. IC Role / Device Role / Timing Role: Current-sinking or sourcing driver for common-anode/common-cathode LED segments with integrated current limiting. Use Value: 24 mA per output supports bright LED illumination without external transistors; VOL ≤ 0.44 V ensures < 2 V forward drop across typical red/green LEDs. |
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), CMOS inputs (VIH = 2 V @ 3.3 V), 6.7 ns tpd | Requires level translation for 5-V systems; suited for mixed-voltage designs with 3.3-V FPGAs or microcontrollers. | Select when migrating to 3.3-V logic domains or when lower power consumption (< 10 µA ICC) is critical. |
| 74ACT244SCX | Same ACT family, SOIC-20 package (DW), identical electrical specs, but obsolete per TI's packaging addendum | No functional difference; limited to through-hole or legacy SOIC assembly processes. | Choose only if TSSOP-20 footprint is incompatible and SOIC-20 board space/layout is available. |
Compared with SN74ACT244PWG4, SN74LVC244APWR offers faster speed and lower voltage operation but lacks 5-V tolerance, while 74ACT244SCX matches all electrical behavior but restricts layout flexibility due to larger SOIC-20 footprint and obsolescence status.
Availability
SN74ACT244PWG4 is available at Aetrix Electronics and suitable for server backplane buffering, telecom line card interfaces, and industrial PLC I/O expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74ACT244PWG4 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 SN74ACT244PWG4 belongs to TI's ACT (Advanced CMOS TTL-compatible) logic series, engineered for high-speed, high-drive 5-V digital interfacing in computing, communications, and industrial control systems.
FAQ
What is the maximum operating temperature for SN74ACT244PWG4?
The SN74ACT244PWG4 is rated for operation from –40 °C to +85 °C, making it suitable for commercial and industrial environments including telecom equipment enclosures and server chassis where ambient temperatures may exceed 70 °C. This rating is confirmed in Section 5.3 of the SCAS517G datasheet and applies specifically to the PW (TSSOP-20) package variant of SN74ACT244PWG4.
Does SN74ACT244PWG4 support 3.3-V input logic levels?
No, SN74ACT244PWG4 does not reliably recognize 3.3-V logic levels as valid high inputs. Its VIH minimum is 2.0 V at 5 V VCC, but the input structure is TTL-compatible-not 3.3-V CMOS-compatible. Applying 3.3 V to an input may result in marginal or undefined switching behavior. For mixed-voltage systems, use SN74LVC244APWR or add discrete level-shifting circuitry before SN74ACT244PWG4 inputs.
Can SN74ACT244PWG4 drive LEDs directly?
Yes, SN74ACT244PWG4 can drive LEDs directly when configured as a current sink (common-anode) or source (common-cathode), provided current-limiting resistors are used. With 24 mA per output and VOL ≤ 0.44 V at 24 mA, it supports typical red/green LEDs at full brightness. Section 8.1 of the datasheet explicitly confirms this use case, and Figure 8-1 shows a validated LED-driving schematic using SNx4ACT244 devices.
What is the pinout configuration for SN74ACT244PWG4?
SN74ACT244PWG4 uses a standard 20-pin TSSOP (PW) pinout: Pin 1 = 1OE, Pins 2/4/6/8 = 1A1–1A4, Pins 3/5/7/9 = 2Y4–2Y1, Pin 10 = GND, Pins 11/13/15/17 = 2A1–2A4, Pins 12/14/16/18 = 1Y4–1Y1, Pin 19 = 2OE, Pin 20 = VCC. This matches Figure 4-2 in the SCAS517G datasheet and is electrically identical to other PW-packaged SN74ACT244 variants.
Is SN74ACT244PWG4 pin-compatible with SN74ACT244PWR?
Yes, SN74ACT244PWG4 and SN74ACT244PWR share identical pinout, electrical specifications, and TSSOP-20 (PW) package dimensions. The "G4" suffix denotes TI's green (lead-free, RoHS-compliant) packaging standard, while "PWR" is the base ordering code. Both are functionally and mechanically interchangeable per TI's packaging addendum and SCAS517G datasheet.
SN74ACT244PWG4 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
SN74ACT244PWG4 FAQ
1.How can I place an order for SN74ACT244PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244PWG4 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 SN74ACT244PWG4 reliable?
The price and inventory of SN74ACT244PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244PWG4 is usually 5 days.
3.What payment methods are accepted for SN74ACT244PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244PWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244PWG4?
SN74ACT244PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244PWG4 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 SN74ACT244PWG4?
For technical support, including SN74ACT244PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244PWG4 requirements.
6.How does Aetrix verify that SN74ACT244PWG4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT244PWG4 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 SN74ACT244PWG4 meets industry standards.
7.What is the process for return or replacement of SN74ACT244PWG4?
All SN74ACT244PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244PWG4, 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 SN74ACT244PWG4 part is unused and in its original packaging.
Return procedure for SN74ACT244PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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