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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

onsemi MC74ACT241MELG

Name: MC74ACT241MELG
Brand: onsemi
SKU: MC74ACT241MELG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74ACT241MELG

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.209", 5.30mm Width)

Datasheet:: MC74ACT241MELG.pdf

Description:: IC BUFF NON-INVERT 5.5V SOEIAJ20

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Product details

Overview

MC74ACT241MELG from onsemi is an octal 3-state buffer/line driver with dual independent output-enable controls (OE1, OE2), TTL-compatible inputs, ±24 mA output drive capability, and operation across 4.5 V to 5.5 V supply. It serves as a memory address driver, clock driver, or bidirectional bus transmitter/receiver in high-density PCB designs.

For engineers reviewing the MC74ACT241MELG datasheet, pinout, applications, or equivalent options, key selection criteria include dual 4-bit enable control, guaranteed 3-state isolation, 9.0 ns max propagation delay at 5.0 V/85°C, and Pb-free SOIC-20W packaging compliant with industrial temperature range (−40°C to +85°C).

Technical Context

The MC74ACT241MELG implements two independent 4-bit non-inverting buffer groups: YA1–YA4 controlled by OE1 (pins 12,14,16,18), and YB1–YB4 controlled by OE2 (pins 3,5,7,9). Each group features high-impedance outputs when its respective enable is inactive.

It operates strictly within 4.5 V–5.5 V VCC, supports TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), and delivers VOH ≥ 4.4 V and VOL ≤ 0.44 V under −24 mA/24 mA loads - meeting ACT-series logic performance with rail-to-rail compatibility.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	4.5 V to 5.5 V - ensures stable operation with standard 5 V logic rails and tolerance for supply variation.
Output Drive	±24 mA - sufficient to drive heavy capacitive loads or multiple TTL inputs without external buffering.
Propagation Delay	Max 10.0 ns (tPLH/tPHL) at 5.0 V, 85°C, CL = 50 pF - enables reliable timing in high-speed address/data buses.
3-State Enable/Disable	tPZL ≤ 11.0 ns, tPHZ ≤ 11.5 ns - fast bus turnaround critical for shared-memory or multiplexed I/O systems.
Input Compatibility	TTL-level VIH/VIL (2.0 V / 0.8 V) - allows direct interfacing with legacy 5 V TTL and CMOS logic families.
Operating Temperature	−40°C to +85°C - qualified for industrial-grade embedded and computing applications.
ESD Rating	HBM > 2000 V - provides robust handling during board assembly and field service.

Pinout & Package

MC74ACT241MELG is packaged in a Pb-free SOIC-20 wide-body (Case 751D) with 1.27 mm pitch, 12.8 mm × 7.5 mm footprint, and 2.65 mm max height. Pin 1 is top-left corner (notch-marked), pin 20 is top-right.

Pin/Terminal	Circuit Role	Design Meaning
1, 20	VCC / GND	Power supply and ground reference - decoupling capacitor placement near these pins minimizes switching noise.
2, 4, 6, 8, 11, 13, 15, 17	DA1–DA4, DB1–DB4	Input data lines - grouped as two 4-bit sets (A: pins 2,4,6,8; B: pins 11,13,15,17) for independent bus segments.
3, 5, 7, 9	YB1–YB4	Outputs enabled by OE2 - driven low-impedance when OE2 = L; high-Z when OE2 = H.
12, 14, 16, 18	YA1–YA4	Outputs enabled by OE1 - driven low-impedance when OE1 = L; high-Z when OE1 = H.
10, 19	OE1 / OE2	Active-low output enables - allow independent control of each 4-bit buffer group for time-multiplexed bus access.

Key Features

Feature	Design Value
Dual independent 3-state enables	OE1 and OE2 provide separate control over two 4-bit output banks - eliminates need for external gating logic in split-bus architectures.
±24 mA output sink/source	Drives up to 10 standard TTL loads per output - reduces fanout limitations in memory address or clock distribution networks.
TTL-compatible inputs	Accepts standard 5 V TTL voltage thresholds without level-shifting - simplifies integration with legacy microcontrollers and FPGAs.
Low propagation delay	Typical 6.5 ns (tPLH) at 5.0 V - supports >100 MHz bus toggle rates in buffered address paths.
Pb-free SOIC-20W package	RoHS-compliant, JEDEC-standard footprint - ensures drop-in compatibility with existing 20-pin SOIC reflow profiles and pick-and-place tooling.

Applications

Memory Address Buffering	Clock Distribution
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or EPROM in space-constrained industrial controller. IC Role / Device Role / Timing Role: Non-inverting octal buffer with dual enable control isolates address lines during bus contention or standby. Use Value: Enables clean, low-skew address delivery with 10.0 ns worst-case delay and 24 mA drive - prevents setup/hold violations at 20 MHz bus speeds.	Use Scenario: Distributing a system clock signal to multiple peripherals (UART, SPI, timer) while minimizing skew and loading. IC Role / Device Role / Timing Role: Low-jitter, high-drive line driver that buffers and fans out clock signals without adding significant delay. Use Value: Delivers matched 9.0 ns tPLH/tPHL across all 8 outputs - maintains inter-peripheral clock alignment within 1 ns.
Bus Transceiver Interface	Legacy System Bus Isolation
Use Scenario: Bidirectional data bus interface between 8-bit microprocessor and peripheral ASIC where direction control is handled externally. IC Role / Device Role / Timing Role: Dual-group 3-state buffer used as unidirectional transmitter/receiver pair with OE1/OE2 synchronized to RD/WR strobes. Use Value: Independent OE control allows precise timing of bus release (tPHZ ≤ 11.5 ns) - prevents bus contention during read/write transitions.	Use Scenario: Isolating aging ISA or PC/104 bus segments from modern FPGA-based subsystems in retro-computing upgrades. IC Role / Device Role / Timing Role: Level-translating buffer that matches TTL input thresholds and drives legacy bus capacitance (≤ 100 pF). Use Value: Guaranteed VOL ≤ 0.44 V at 24 mA ensures valid LOW recognition by vintage peripherals - avoids marginal logic states.

Memory Address Buffering

Clock Distribution

Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or EPROM in space-constrained industrial controller.

IC Role / Device Role / Timing Role: Non-inverting octal buffer with dual enable control isolates address lines during bus contention or standby.

Use Value: Enables clean, low-skew address delivery with 10.0 ns worst-case delay and 24 mA drive - prevents setup/hold violations at 20 MHz bus speeds.

Use Scenario: Distributing a system clock signal to multiple peripherals (UART, SPI, timer) while minimizing skew and loading.

IC Role / Device Role / Timing Role: Low-jitter, high-drive line driver that buffers and fans out clock signals without adding significant delay.

Use Value: Delivers matched 9.0 ns tPLH/tPHL across all 8 outputs - maintains inter-peripheral clock alignment within 1 ns.

Bus Transceiver Interface

Legacy System Bus Isolation

Use Scenario: Bidirectional data bus interface between 8-bit microprocessor and peripheral ASIC where direction control is handled externally.

IC Role / Device Role / Timing Role: Dual-group 3-state buffer used as unidirectional transmitter/receiver pair with OE1/OE2 synchronized to RD/WR strobes.

Use Value: Independent OE control allows precise timing of bus release (tPHZ ≤ 11.5 ns) - prevents bus contention during read/write transitions.

Use Scenario: Isolating aging ISA or PC/104 bus segments from modern FPGA-based subsystems in retro-computing upgrades.

IC Role / Device Role / Timing Role: Level-translating buffer that matches TTL input thresholds and drives legacy bus capacitance (≤ 100 pF).

Use Value: Guaranteed VOL ≤ 0.44 V at 24 mA ensures valid LOW recognition by vintage peripherals - avoids marginal logic states.

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
SN74ACT241N	Same logic function, pinout, and AC/DC specs; differs in package (PDIP-20 vs SOIC-20W) and moisture sensitivity (MSL 1 vs MSL 3).	Preferred for through-hole prototyping or legacy DIP-based systems; not suitable for automated SMT assembly.	Select SN74ACT241N only if manual soldering or socket-based development is required.
74ACT241SCX	Identical electrical specs and pinout; manufactured by Diodes Inc., Pb-free TSSOP-20 package (Case 948E), MSL 1 rating.	Better thermal resistance (150°C/W vs 96°C/W) but lower drive margin at high temperature due to package power dissipation limits.	Choose 74ACT241SCX when board space is constrained and thermal management permits TSSOP footprint.

Compared with SN74ACT241N and 74ACT241SCX, the MC74ACT241MELG offers optimal balance of industrial temperature support, SOIC-20W mechanical robustness, and proven reliability in high-volume embedded systems - making it preferred for production-grade PCBs requiring long-term supply stability.

Availability

MC74ACT241MELG is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and bus-oriented transmitter/receiver applications requiring stable component supply, industrial temperature compliance, and RoHS-compliant packaging.

Supply support for MC74ACT241MELG 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The MC74ACT241MELG belongs to onsemi's advanced CMOS logic family designed specifically for high-speed, low-power, and high-noise-immunity digital interfacing in industrial and computing systems.

FAQ

What is the maximum operating supply voltage for MC74ACT241MELG?

The MC74ACT241MELG has an absolute maximum DC supply voltage (VCC) of +6.5 V, but its recommended operating range is strictly 4.5 V to 5.5 V. Operating outside this range may cause unreliable logic behavior or accelerated device degradation. The MC74ACT241MELG is not rated for 3.3 V operation and requires a stable 5 V rail to meet all AC and DC specifications.

Does MC74ACT241MELG support true bidirectional data flow?

No, the MC74ACT241MELG is a unidirectional octal buffer with fixed input-to-output signal flow (DA→YA, DB→YB). It does not contain internal direction control or bus transceiver logic. Bidirectional operation requires external control of OE1/OE2 and complementary circuitry - the MC74ACT241MELG itself functions only as a non-inverting driver with 3-state outputs.

What is the thermal resistance (θJA) of MC74ACT241MELG in its SOIC-20W package?

The MC74ACT241MELG in SOIC-20W (Case 751D) has a specified junction-to-ambient thermal resistance (θJA) of 96°C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad with two vias; actual board-level θJA will vary based on PCB layout, copper area, and airflow.

Can unused inputs on MC74ACT241MELG be left floating?

No - per the datasheet (Note 6), all unused inputs on the MC74ACT241MELG must be tied to a defined logic level (VCC or GND) and cannot be left open. Floating inputs may cause increased ICC, erratic output behavior, or ESD susceptibility. The MC74ACT241MELG exhibits TTL-compatible input structure with no internal pull-ups or pull-downs.

Is MC74ACT241MELG pin-compatible with the older 74LS241?

No, the MC74ACT241MELG is not pin-compatible with the 74LS241. While both are octal 3-state buffers, the MC74ACT241MELG uses a different pin assignment: OE1 and OE2 are on pins 10 and 19, whereas the 74LS241 uses a single OE on pin 1. Additionally, input/output grouping and power pin locations differ - direct replacement would require PCB redesign.

MC74ACT241MELG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74ACT

Package/Case:: 20-SOIC (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

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:: SOEIAJ-20

MC74ACT241MELG FAQ

1.How can I place an order for MC74ACT241MELG through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74ACT241MELG 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 MC74ACT241MELG reliable?

The price and inventory of MC74ACT241MELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT241MELG is usually 5 days.

3.What payment methods are accepted for MC74ACT241MELG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT241MELG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74ACT241MELG?

MC74ACT241MELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74ACT241MELG 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 MC74ACT241MELG?

For technical support, including MC74ACT241MELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT241MELG requirements.

6.How does Aetrix verify that MC74ACT241MELG is sourced from the original manufacturer or authorized distributors?

All MC74ACT241MELG 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 MC74ACT241MELG meets industry standards.

7.What is the process for return or replacement of MC74ACT241MELG?

All MC74ACT241MELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT241MELG, 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 MC74ACT241MELG part is unused and in its original packaging.

Return procedure for MC74ACT241MELG:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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