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Texas Instruments SN74ACT244NG4
- Part No.:
- SN74ACT244NG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ACT244NG4.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,787
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Product details
Overview
SN74ACT244NG4 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 TTL-level inputs with guaranteed VIH ≥ 2.0 V and VIL ≤ 0.8 V - enabling direct interface with legacy TTL logic in industrial control backplanes.
For engineers reviewing the SN74ACT244NG4 datasheet, SN74ACT244NG4 pinout, SN74ACT244NG4 application, or SN74ACT244NG4 equivalent, this page provides verified functional specifications, validated 20-pin PDIP package mapping, confirmed dual 4-bit buffer architecture with independent active-low OE controls, and real-world implementation guidance for LED driving, server I/O expansion, and telecom switching networks.
Technical Context
The SN74ACT244NG4 implements two independent 4-bit non-inverting buffer sections (1A→1Y and 2A→2Y), each controlled by a dedicated active-low output-enable input (1OE, 2OE). Its TTL-compatible inputs accept voltages up to 5.5 V, allowing safe interfacing with mixed-voltage subsystems while maintaining 5-V rail operation.
Each output drives ±24 mA under recommended conditions and transitions to high-impedance when its respective OE is high. Propagation delays are tightly specified: tPLH/tPHL ≤ 10 ns and tPZH/tPHZ ≤ 10.5 ns at VCC = 5 V, supporting reliable timing in synchronous bus applications up to ~50 MHz.
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. |
| IOH / IOL | –24 mA / +24 mA - sufficient to directly drive LEDs or terminate unterminated TTL bus stubs without external buffers. |
| tpd Max | 9.5 ns at 5 V - enables use in high-speed address/data latching and clock fanout where sub-10-ns skew is required. |
| VIH / VIL | ≥ 2.0 V / ≤ 0.8 V - guarantees robust noise margin and compatibility with standard TTL outputs (e.g., 74LS series). |
| IOZ (Hi-Z Leakage) | ±2.5 µA at 5.5 V - minimizes bus leakage current during tri-state, critical for low-power standby modes in multi-driver buses. |
| ICC Quiescent | 4 µA at 5.5 V - ultra-low static power consumption ideal for always-on control logic in energy-sensitive embedded systems. |
| ESD HBM | ±3000 V - meets industrial handling requirements without requiring special ESD precautions beyond standard bench protocols. |
Pinout & Package
SN74ACT244NG4 is supplied in a 20-pin plastic dual in-line package (PDIP, N package), with 0.300-inch body width and through-hole mounting. Pin 10 is GND, pin 20 is VCC, and both output-enable inputs (1OE, 2OE) are active-low and located on opposite ends of the package for noise-isolated control routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enable inputs - assert low to enable corresponding 4-bit buffer section; tie high via pullup for power-up Hi-Z safety. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Buffer input terminals - accept TTL/CMOS logic levels; all inputs must be terminated to VCC or GND to prevent floating states. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Non-inverting buffered outputs - drive loads up to ±24 mA; enter high-impedance state when OE is high. |
| 10 | GND | Ground reference - common return path for all internal logic and output currents; requires low-inductance connection. |
| 20 | VCC | Power supply - 4.5–5.5 V nominal; requires local 0.1-µF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts 0–5.5 V input range with VIH ≥ 2.0 V at 5 V VCC - eliminates level-shifting for legacy TTL system integration. |
| Independent 3-state control | Dual active-low OE pins (1OE, 2OE) allow selective enabling of two 4-bit groups - enables flexible bus arbitration and partial bus isolation. |
| High-output drive strength | ±24 mA per output at VCC = 5 V - supports direct LED driving (with series resistor) and termination of unterminated transmission lines. |
| Low propagation delay | 9.5 ns max tpd at 5 V - meets timing budgets for 50-MHz address/data strobes and clock distribution in industrial controllers. |
| Ultra-low quiescent current | 4 µA ICC at 5.5 V - reduces system standby power in battery-backed or energy-harvesting applications. |
Applications
| LED Display Driver | Server I/O Expansion |
|---|---|
|
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 with 24-mA sink/source capability per segment, controlled by microcontroller GPIO via 1OE/2OE. Use Value: Eliminates need for discrete transistor arrays; single SN74ACT244NG4 drives eight segments with 1-kΩ current-limiting resistors at 5 V. |
Use Scenario: Expanding parallel I/O capacity on x86-based server management controllers (e.g., BMCs) for status LED banks and sensor readouts. IC Role / Device Role / Timing Role: Bidirectional bus buffer isolating microcontroller GPIO from high-capacitance LED/sensor traces. Use Value: Prevents signal integrity degradation on long PCB traces; 9.5 ns tpd ensures synchronization with 20-MHz firmware polling loops. |
| Telecom Switching Network | Memory Address Buffering |
|
Use Scenario: Level translation and fanout for control signals in TDM switch fabric boards operating in -40°C to +85°C environments. IC Role / Device Role / Timing Role: 3-state driver enabling time-division multiplexing of shared control busses between multiple ASICs. Use Value: Dual OE control allows dynamic bus ownership handoff; ±3000-V HBM rating ensures reliability in field-replaceable line cards. |
Use Scenario: Buffering address lines between microprocessor and SRAM/Flash in ruggedized embedded controllers. IC Role / Device Role / Timing Role: Low-skew, high-drive address driver improving setup/hold margins for 10-ns access-time memories. Use Value: 9.5 ns tpd and 24-mA drive reduce address line rise/fall times below 5 ns, minimizing timing violations in 50-MHz bus cycles. |
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 |
|---|---|---|---|
| SN74ACT244N | Same die, identical electrical specs, same PDIP-20 package but without G4 suffix (RoHS-compliant finish). | No functional difference; SN74ACT244NG4 adds lead-free NiPdAu plating per JEDEC J-STD-609. | Select SN74ACT244NG4 for RoHS-compliant production; SN74ACT244N remains viable for legacy non-RoHS builds. |
| SN74LVC244APWR | 3.3-V only (1.65–3.6 V), lower drive (±24 mA), higher speed (tPLH ≤ 5.3 ns), different pinout (TSSOP-20). | Not pin-compatible; requires PCB redesign and voltage translation if interfacing with 5-V systems. | Choose only for new 3.3-V designs prioritizing speed and lower power; not a drop-in replacement for SN74ACT244NG4. |
Compared with SN74ACT244N, SN74ACT244NG4 offers identical functionality with enhanced environmental compliance, while SN74LVC244APWR trades 5-V compatibility for higher speed and lower voltage operation - making it suitable only for greenfield 3.3-V designs.
Availability
SN74ACT244NG4 is available at Aetrix Electronics and suitable for industrial control backplanes, telecom line card interfaces, and embedded server management systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74ACT244NG4 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 for industrial, automotive, and communications markets.
The SN74ACT244NG4 belongs to TI's ACT (Advanced CMOS TTL-compatible) logic family, engineered for high-speed, high-drive 5-V digital interfacing in mission-critical infrastructure equipment.
FAQ
What is the operating temperature range for SN74ACT244NG4?
The SN74ACT244NG4 is rated for industrial operation from –40°C to +85°C. This range is validated per TI's catalog specification and applies to all package variants including the PDIP-20 SN74ACT244NG4. The device maintains full electrical performance across this span, with parameters such as tpd, VOH, and VOL guaranteed per Section 5.3 of the SCAS517G datasheet.
Does SN74ACT244NG4 support 5-V tolerant inputs?
Yes, SN74ACT244NG4 inputs accept voltages up to 5.5 V regardless of VCC level, as stated in the "Inputs accept voltages to 5.5V" feature and confirmed in Absolute Maximum Ratings (VI ≤ VCC + 0.5 V). This allows safe interfacing with 5-V signals even when VCC is at minimum 4.5 V, eliminating external clamping diodes in mixed-voltage designs.
Can SN74ACT244NG4 drive LEDs directly?
Yes, SN74ACT244NG4 can drive LEDs directly using its ±24 mA output capability. As documented in Section 8.1 and Figure 8-1 of the datasheet, a 1-kΩ current-limiting resistor at 5 V yields ~5 mA per LED - well within the device's rated IOL/IOH and safe for continuous operation. Each output must include its own resistor; parallel loading across multiple Y pins is permitted.
What is the function of pins 1 and 19 on SN74ACT244NG4?
Pins 1 and 19 are the active-low output-enable inputs 1OE and 2OE. When pulled low, they enable the corresponding 4-bit buffer group (1A→1Y or 2A→2Y); when high, those outputs enter high-impedance state. TI recommends tying OE pins to VCC via a pullup resistor during power-up to ensure Hi-Z default - preventing bus contention before firmware initialization.
Is SN74ACT244NG4 pin-compatible with other SN74ACT244 variants?
Yes, SN74ACT244NG4 shares identical pinout and functionality with all SN74ACT244 variants in PDIP-20 packaging (e.g., SN74ACT244N, SN74ACT244NE4). The G4 suffix denotes RoHS-compliant NiPdAu lead finish but does not affect pin assignment, timing, or logic behavior - enabling seamless substitution in existing PDIP-20 layouts.
SN74ACT244NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
SN74ACT244NG4 FAQ
1.How can I place an order for SN74ACT244NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244NG4 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 SN74ACT244NG4 reliable?
The price and inventory of SN74ACT244NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244NG4 is usually 5 days.
3.What payment methods are accepted for SN74ACT244NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244NG4?
SN74ACT244NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244NG4 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 SN74ACT244NG4?
For technical support, including SN74ACT244NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244NG4 requirements.
6.How does Aetrix verify that SN74ACT244NG4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT244NG4 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 SN74ACT244NG4 meets industry standards.
7.What is the process for return or replacement of SN74ACT244NG4?
All SN74ACT244NG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244NG4, 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 SN74ACT244NG4 part is unused and in its original packaging.
Return procedure for SN74ACT244NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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