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Texas Instruments SN74ACT244N
- Part No.:
- SN74ACT244N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ACT244N.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:652
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Product details
Overview
SN74ACT244N from Texas Instruments is an octal 3-state non-inverting buffer/driver IC in a 20-pin PDIP package, operating at 4.5–5.5 V with TTL-compatible inputs, 9.5 ns max propagation delay at 5 V, and ±24 mA output drive per channel-used for bus buffering, memory address driving, and LED interface circuits.
For engineers reviewing the SN74ACT244N datasheet, SN74ACT244N pinout, SN74ACT244N application, or SN74ACT244N equivalent, this page delivers verified electrical specs, functional pin mapping, real-world use cases, and validated alternative options for industrial and telecom system design.
Technical Context
The SN74ACT244N implements two independent 4-bit non-inverting buffers, each with active-low 3-state output enable (1OE, 2OE). Its TTL-compatible inputs accept 0–5.5 V signals, and outputs drive up to ±24 mA while maintaining VOH ≥3.76 V and VOL ≤0.44 V at 5 V supply and 24 mA load.
It operates across –40°C to +85°C, supports 5-V-only logic systems, and features low quiescent current (ICC = 4 µA typical), high noise immunity (VIH = 2 V min, VIL = 0.8 V max), and fast switching with tPLH/tPHL ≤10 ns and tPZH/tPHZ ≤10.5 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and CMOS systems without level-shifting. |
| Max Propagation Delay | 9.5 ns at 5 V - enables reliable operation in high-speed bus and clock distribution up to ~100 MHz. |
| Output Drive | ±24 mA per channel - sufficient to directly drive LEDs or interface with multiple TTL loads (fan-out ≥20). |
| Input Compatibility | TTL-compatible - accepts standard 0.8 V/2.0 V logic thresholds, eliminating need for external level translators. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial environments including servers and telecom equipment. |
| Quiescent Current | 4 µA typical at 5.5 V - minimizes standby power in always-on buffer applications. |
| ESD Rating | HBM ±3000 V - meets robustness requirements for handling and board assembly in production lines. |
Pinout & Package
SN74ACT244N uses a 20-pin plastic dual in-line package (PDIP) with 0.3-inch body width and through-hole mounting. Thermal resistance RθJA is 48.1°C/W, supporting moderate-power operation without forced cooling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls first and second 4-bit buffer groups independently. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Eight buffered input terminals - non-inverting, TTL-compatible, voltage-tolerant to 5.5 V. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Eight 3-state output terminals - driven low/high when OE is low; high-impedance when OE is high. |
| 10 | GND | Ground reference for all logic and output stages - must be connected to system common ground plane. |
| 20 | VCC | Positive supply rail - requires local 0.1-µF ceramic bypass capacitor adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Output Control | Independent active-low OE pins allow selective isolation of two 4-bit data paths on shared buses without contention. |
| TTL-Compatible Inputs | Accepts standard 0.8 V/2.0 V logic thresholds - interoperable with legacy 5-V TTL and LVTTL sources without translation. |
| High-Drive Outputs | ±24 mA per output supports direct LED driving (with series resistor) or fan-out to ≥20 TTL loads. |
| Wide Supply Range | 4.5–5.5 V operation accommodates supply tolerance and aging in 5-V systems while maintaining full performance. |
| Low Propagation Delay | ≤9.5 ns max at 5 V enables timing-critical applications such as memory address latching and clock distribution. |
Applications
| LED Displays | Servers and Telecommunication |
|---|---|
Use Scenario: Driving 7-segment or dot-matrix LED displays in industrial HMIs and instrumentation panels. IC Role / Device Role / Timing Role: Non-inverting buffer providing current gain and logic-level isolation between microcontroller GPIO and LED anodes/cathodes. Use Value: Enables direct drive of multiple LEDs using 1-kΩ current-limiting resistors while maintaining clean 0–5 V logic transitions and low VOL (≤0.44 V). | Use Scenario: Buffering address/data lines between CPU and memory or peripheral controllers in rack-mounted servers. IC Role / Device Role / Timing Role: Octal 3-state driver isolating bidirectional bus segments during read/write cycles to prevent signal contention. Use Value: Supports high-fanout, low-skew transmission with 9.5 ns max delay and ±24 mA drive-critical for stable DDR2/DDR3 memory subsystem timing. |
| Switching Networks | Industrial Control Systems |
Use Scenario: Signal routing and level translation in packet-switched backplanes and telecom line cards. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling dynamic reconfiguration of signal paths under FPGA or ASIC control. Use Value: Independent OE control allows hot-swap-safe insertion/removal of modules without disrupting active data lanes. | Use Scenario: Interfacing PLC I/O modules with field sensors and actuators requiring robust 5-V logic interfacing. IC Role / Device Role / Timing Role: Isolation buffer protecting controller outputs from ESD and inductive kickback in noisy factory environments. Use Value: HBM ±3000 V rating and 48.1°C/W thermal resistance ensure long-term reliability in uncontrolled ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS244N | Lower drive (±15 mA), slower (tPD ≈ 25 ns), higher ICC (42 mA), TTL-only supply (4.75–5.25 V). | Not suitable for high-speed or high-fanout designs; limited to legacy 5-V TTL systems with relaxed timing. | Select SN74LS244N only if backward compatibility with LS-family timing and power profiles is required. |
| SN74HC244N | Wider VCC range (2–6 V), lower drive (±7.8 mA), higher speed (tPD ≈ 19 ns), CMOS input thresholds. | Better for mixed-voltage systems but insufficient for driving >10 TTL loads or LEDs without external drivers. | Choose SN74HC244N when operating below 4.5 V or integrating with 3.3-V logic; avoid where ≥24 mA per channel is mandatory. |
Compared with SN74LS244N and SN74HC244N, SN74ACT244N uniquely balances 5-V TTL compatibility, 24-mA drive strength, and sub-10-ns speed-making it optimal for legacy 5-V bus expansion, LED matrix control, and industrial backplane interfaces where both performance and interoperability matter.
Availability
SN74ACT244N is available at Aetrix Electronics and suitable for LED displays, servers and telecommunication infrastructure, and switching networks requiring stable component supply, long-lifecycle support, and RoHS-compliant through-hole packaging.
Supply support for SN74ACT244N 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The SNx4ACT244 product line was designed to provide high-drive, low-delay 3-state buffering for 5-V bus-oriented systems-including memory addressing, clock distribution, and peripheral interfacing in legacy and mixed-signal platforms.
FAQ
What is the maximum operating temperature for SN74ACT244N?
The SN74ACT244N is rated for operation from –40°C to +85°C. This temperature range is specified in the Recommended Operating Conditions section of the datasheet and applies to the commercial-grade PDIP variant. It supports deployment in industrial control cabinets and telecom equipment enclosures without active thermal management.
Does SN74ACT244N support 3.3-V input logic levels?
No, SN74ACT244N does not guarantee reliable operation with 3.3-V inputs. Its VIH minimum is 2.0 V at 5-V VCC, but the device is designed for TTL-compatible 5-V systems. Applying 3.3-V logic may result in marginal or undefined switching behavior; level-shifting is recommended for mixed-voltage interfacing.
Can SN74ACT244N drive LEDs directly?
Yes, SN74ACT244N can drive LEDs directly when used with appropriate current-limiting resistors. With ±24 mA per output and VOL ≤0.44 V at 24 mA, a 1-kΩ resistor at 5 V limits current to ~4.6 mA-well within safe operating limits for standard indicator LEDs and the device's output rating.
What is the pin count and package type of SN74ACT244N?
SN74ACT244N uses a 20-pin plastic dual in-line package (PDIP) with 0.3-inch body width and through-hole mounting. The package is designated "N" in TI's ordering nomenclature and is RoHS-compliant with NIPDAU lead finish.
How does the 3-state output enable work on SN74ACT244N?
SN74ACT244N has two active-low output enable inputs: 1OE (pin 1) controls outputs 1Y1–1Y4, and 2OE (pin 19) controls outputs 2Y1–2Y4. When either OE is high, its corresponding four outputs enter high-impedance state-electrically disconnecting them from the bus. This enables multi-drop bus architectures and prevents signal contention.
SN74ACT244N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ACT244N FAQ
1.How can I place an order for SN74ACT244N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244N 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 SN74ACT244N reliable?
The price and inventory of SN74ACT244N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244N is usually 5 days.
3.What payment methods are accepted for SN74ACT244N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244N?
SN74ACT244N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244N 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 SN74ACT244N?
For technical support, including SN74ACT244N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244N requirements.
6.How does Aetrix verify that SN74ACT244N is sourced from the original manufacturer or authorized distributors?
All SN74ACT244N 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 SN74ACT244N meets industry standards.
7.What is the process for return or replacement of SN74ACT244N?
All SN74ACT244N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244N, 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 SN74ACT244N part is unused and in its original packaging.
Return procedure for SN74ACT244N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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