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onsemi MC74ACT244NG
- Part No.:
- MC74ACT244NG
- Manufacturer:
- onsemi
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
MC74ACT244NG.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,012
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Product details
Overview
MC74ACT244NG from onsemi is an octal 3-state buffer/line driver with TTL-compatible inputs, designed for memory address driving, clock distribution, and bidirectional bus interfacing in industrial and embedded systems. It operates at 4.5 V to 5.5 V, delivers ±24 mA output drive, features 9.0 ns max propagation delay at 5 V, and supports −40°C to +85°C ambient operation.
For engineers reviewing the MC74ACT244NG datasheet, pinout, applications, or equivalent options, this page provides verified functional specifications, package mapping, real-world use scenarios, and validated alternative options for bus buffering and level translation in high-density PCB designs.
Technical Context
The MC74ACT244NG implements two independent 4-bit non-inverting buffers, each controlled by a dedicated 3-state enable (OE1/OE2). Its TTL-compatible inputs accept 0.8 V low and 2.0 V high thresholds at 5 V supply, enabling direct interfacing with legacy 5 V logic families without level shifters.
All eight outputs are fully 3-state capable with guaranteed high-impedance leakage ≤ ±5.0 µA and fast enable/disable timing: tPZH/tPLZ ≤ 9.5 ns and tPHZ/tPLZ ≤ 10.5 ns at 5 V/85°C, supporting dynamic bus arbitration in shared-data-path architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL and CMOS systems while maintaining noise margin. |
| Output Drive | ±24 mA - sufficient to drive 50 Ω transmission lines or fan-out to ≥10 LS-TTL loads without external buffering. |
| Propagation Delay | ≤10.0 ns at 5 V - enables reliable operation in 50 MHz+ address/data bus cycles with timing margin. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - matches TTL logic levels, eliminating need for input voltage translation. |
| 3-State Leakage | ±5.0 µA - prevents signal contention and static current draw when outputs are disabled on shared buses. |
| Operating Temperature | −40°C to +85°C - qualified for industrial control, instrumentation, and automotive under-hood auxiliary modules. |
| ESD Rating | HBM > 2000 V - provides robust handling during board assembly and field service without additional protection circuitry. |
Pinout & Package
MC74ACT244NG is housed in a Pb-free SOIC-20 wide-body package (Case 751D), measuring 12.8 mm × 7.5 mm × 2.35 mm, with 1.27 mm pitch and gull-wing leads suitable for reflow soldering per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 13, 15, 17, 19 | Data Inputs (A1–A4, B1–B4) | Non-inverting input terminals for two independent 4-bit channels; accept TTL/CMOS logic levels directly. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 3-State Outputs (Y1–Y4, Z1–Z4) | Buffered, high-drive outputs; enter high-impedance state when respective OE is HIGH. |
| 11, 10 | Output Enables (OE1, OE2) | Active-LOW enables for Channel A (pins 12–18) and Channel B (pins 3–9); support independent bus segment control. |
| 20 | VCC | Positive supply rail (4.5–5.5 V); decoupling capacitor required within 10 mm for stable switching performance. |
| 10 | GND | Ground reference for all I/O and internal logic; must be connected to low-impedance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | VIH = 2.0 V / VIL = 0.8 V at 5 V - enables plug-and-play integration with legacy microcontrollers, FPGAs, and ASICs using standard 5 V logic families. |
| High-Drive 3-State Outputs | ±24 mA sink/source - drives terminated transmission lines or multiple downstream loads without external drivers, reducing component count. |
| Low Propagation Skew | Matched tPLH/tPHL ≤ 1.0 ns variation across all 8 outputs - preserves data integrity in parallel bus applications with tight setup/hold windows. |
| Pb-Free SOIC-20 Package | RoHS-compliant, JEDEC-standard footprint - supports automated assembly and long-term supply continuity without lead-free process conversion risk. |
| Industrial Temperature Range | −40°C to +85°C operation - validated for deployment in programmable logic controllers, motor drives, and factory automation equipment. |
Applications
| Memory Address Buffering | Microcontroller Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or flash devices on a shared bus. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating MCU address outputs from capacitive bus loading and enabling multi-drop addressing. Use Value: Prevents address skew and signal degradation across 10+ cm traces while allowing dynamic bus sharing between memory and peripherals. | Use Scenario: Interfacing an 8-bit MCU with external peripherals via a multiplexed data/address bus. IC Role / Device Role / Timing Role: Bidirectional bus transceiver channel controller, enabling time-multiplexed read/write operations with precise OE timing control. Use Value: Eliminates need for discrete MOSFET switches or complex glue logic, reducing BOM cost and layout area by 30% versus discrete solutions. |
| Industrial Clock Distribution | Legacy System Signal Translation |
Use Scenario: Distributing a 25 MHz system clock to multiple FPGA configuration ICs and ADC sampling clocks. IC Role / Device Role / Timing Role: Low-skew, high-drive clock buffer with independent enable control per channel for power-gated clock domains. Use Value: Maintains <100 ps inter-channel skew and meets jitter requirements for 12-bit ADC sampling at 5 MSPS without added PLL circuitry. | Use Scenario: Connecting modern 3.3 V FPGA I/O banks to legacy 5 V industrial sensors and displays. IC Role / Device Role / Timing Role: Level-translating buffer with TTL-compatible inputs and 5 V-tolerant outputs, operating from 5 V supply. Use Value: Provides safe, DC-coupled voltage translation without direction control pins or external bias resistors, simplifying interface design. |
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 | Identical electrical specs and pinout; manufactured by Texas Instruments with same AC/DC characteristics and temperature range. | No functional difference; TI version uses PDIP-20 instead of SOIC-20, requiring PCB layout change for through-hole assembly. | Select SN74ACT244N only if through-hole prototyping or legacy DIP-based systems require manual soldering compatibility. |
| 74VHC244N | Lower drive (±8 mA), wider supply range (2–5.5 V), CMOS inputs (VIH = 3.5 V @ 5 V), no TTL compatibility. | Not suitable for direct TTL interface; requires pull-up/pull-down or level-shifting when driven by 5 V TTL sources. | Choose 74VHC244N only for mixed-voltage systems where 3.3 V logic coexists with 5 V supplies and TTL compatibility is unnecessary. |
Compared with SN74ACT244N and 74VHC244N, the MC74ACT244NG offers identical functionality in a surface-mount SOIC-20 package with guaranteed TTL input compatibility-making it optimal for space-constrained industrial PCBs requiring drop-in 5 V bus buffering without redesign.
Availability
MC74ACT244NG is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus interfacing, and industrial clock distribution requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MC74ACT244NG 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74ACT244NG belongs to onsemi's 74ACT logic family, engineered for high-speed, low-power 5 V TTL-compatible digital interfacing in industrial control, test equipment, and legacy system upgrades.
FAQ
What is the maximum operating supply voltage for MC74ACT244NG?
The MC74ACT244NG has an absolute maximum supply voltage of 6.5 V, but its recommended operating range is strictly 4.5 V to 5.5 V. Operation outside this window may cause undefined logic behavior or accelerated parametric drift. The MC74ACT244NG is not rated for 3.3 V-only operation and requires a stable 5 V rail to meet its TTL-compatible input thresholds and ±24 mA output specifications.
Does MC74ACT244NG support hot insertion or live bus swapping?
No, the MC74ACT244NG does not include hot-swap protection circuitry. Its inputs and outputs are not designed for backdrive tolerance during live insertion. Applying signals before VCC stabilization or connecting/disconnecting while powered risks latch-up or permanent damage due to violation of VI/VOUT limits (−0.5 V to VCC + 0.5 V). Always power-cycle the board before inserting or removing the MC74ACT244NG.
Can MC74ACT244NG drive a 50 Ω transmission line directly?
Yes, the MC74ACT244NG can drive a 50 Ω transmission line directly when terminated at the far end. With ±24 mA output capability and typical VOL/VOH of 0.36 V / 4.4 V at 24 mA, it delivers sufficient swing and edge rate (tPLH/tPHL ≤ 10 ns) for point-to-point 5 V signaling up to 20 cm. For longer traces or stubbed topologies, impedance matching and controlled slew rate remain critical-consult the MC74ACT244NG IBIS model for SI validation.
Is MC74ACT244NG pin-compatible with MC74AC244NG?
Yes, the MC74ACT244NG is pin-compatible with MC74AC244NG in the same SOIC-20 package, sharing identical pinout, footprint, and terminal functions. However, they differ electrically: MC74ACT244NG has TTL-compatible inputs (VIH = 2.0 V), while MC74AC244NG uses CMOS thresholds (VIH = 3.15 V at 5 V). Swapping them requires verifying source logic family compatibility to avoid input recognition failures.
What is the thermal resistance (θJA) of MC74ACT244NG in SOIC-20 package?
The MC74ACT244NG in SOIC-20 (Case 751D) has a junction-to-ambient thermal resistance (θJA) of 96°C/W, measured per JESD 51-7 with standard 1-inch² copper pad. Under worst-case conditions (85°C ambient, full 8-output switching at 24 mA), power dissipation remains below 250 mW, keeping junction temperature well below the 140°C limit. No heatsink is required for typical industrial use.
MC74ACT244NG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
MC74ACT244NG FAQ
1.How can I place an order for MC74ACT244NG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74ACT244NG 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 MC74ACT244NG reliable?
The price and inventory of MC74ACT244NG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT244NG is usually 5 days.
3.What payment methods are accepted for MC74ACT244NG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT244NG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74ACT244NG?
MC74ACT244NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74ACT244NG 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 MC74ACT244NG?
For technical support, including MC74ACT244NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT244NG requirements.
6.How does Aetrix verify that MC74ACT244NG is sourced from the original manufacturer or authorized distributors?
All MC74ACT244NG 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 MC74ACT244NG meets industry standards.
7.What is the process for return or replacement of MC74ACT244NG?
All MC74ACT244NG units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT244NG, 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 MC74ACT244NG part is unused and in its original packaging.
Return procedure for MC74ACT244NG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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