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onsemi MC74ACT541MELG

Name: MC74ACT541MELG
Brand: onsemi
SKU: MC74ACT541MELG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74ACT541MELG

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: MC74ACT541MELG.pdf

Description:: IC BUFF NON-INVERT 5.5V SOEIAJ20

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Product details

Overview

MC74ACT541MELG from onsemi is an octal noninverting buffer/line driver with 3-state outputs, designed for memory and address bus interfacing, clock distribution, and microprocessor output port expansion. It operates at 4.5 V to 5.5 V, delivers ±24 mA output drive, features TTL-compatible inputs, and uses flow-through pinout (inputs on one side, outputs on the other) in a SOIC-20W package.

For engineers reviewing the MC74ACT541MELG datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, confirmed DC/AC timing specs, validated SOIC-20W pin mapping, real-world use cases in bus driving and microprocessor I/O expansion, and two technically documented alternative parts with precise interface differences.

Technical Context

The MC74ACT541MELG implements eight independent noninverting buffers, each with dual 3-state enable controls (OE1 and OE2). Its flow-through architecture places all eight inputs on pins 1–8 and all eight outputs on pins 13–20, enabling direct parallel connection to microprocessor data/address buses without signal layer crossover.

It supports TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5.5 V), guarantees VOH ≥ 4.4 V and VOL ≤ 0.44 V at ±24 mA loads, and achieves tPLH/tPHL ≤ 8.0 ns (CL = 50 pF, VCC = 5.0 V) - meeting high-speed bus timing requirements for legacy and industrial control systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Octal noninverting buffer with 3-state outputs - enables bidirectional bus control via OE1/OE2 logic.
Supply Voltage Range	4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS systems; not rated for 3.3 V operation.
Output Drive	±24 mA per output - sufficient to drive 50 Ω transmission lines or multiple TTL loads without external buffering.
Propagation Delay	≤ 8.0 ns (tPLH/tPHL, CL = 50 pF, VCC = 5.0 V) - ensures sub-10 ns timing margin for 25 MHz bus cycles.
Input Compatibility	TTL-compatible inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V) - interfaces directly with legacy 5 V microcontrollers and FPGAs without level shifters.
3-State Leakage	±5.0 μA max (IOZ, VCC = 5.5 V) - prevents bus contention and signal corruption during disable states.
Package	SOIC-20W (Case 751D) - industry-standard 0.300″ wide body, 1.27 mm pitch, Pb-free, RoHS-compliant.

Pinout & Package

MC74ACT541MELG is housed in a 20-pin SOIC-20W (Case 751D) package with 1.27 mm lead pitch, 7.5 mm width, and Pb-free finish. Pin numbering follows standard SOIC convention with Pin 1 indicator at top-left corner.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	Inputs (D1–D8)	Noninverting data inputs; accept TTL-compatible logic levels; connect directly to microprocessor data/address lines.
9, 10	Output Enables (OE1, OE2)	Active-low enables; both must be LOW to activate all outputs; allows independent gating of two 4-bit groups if wired separately.
11	GND	Ground reference for all internal circuitry and I/O; requires low-impedance PCB connection to minimize noise coupling.
12	VCC	Positive supply (4.5–5.5 V); decoupling capacitor (0.1 μF ceramic) required within 10 mm of this pin.
13–20	Outputs (Y1–Y8)	Noninverting buffered outputs; drive up to ±24 mA; enter high-impedance state when OE1 or OE2 is HIGH.

Key Features

Feature	Design Value
Flow-through pinout	Inputs on left side (Pins 1–8), outputs on right side (Pins 13–20) - eliminates PCB trace crossovers and reduces layout complexity for bus routing.
TTL-compatible inputs	VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5.5 V - ensures reliable interfacing with legacy 5 V microcontrollers and peripheral ICs without level translation.
High-output drive	±24 mA per output - supports fan-out to 10+ TTL loads or termination of 50 Ω transmission lines in backplane applications.
Low propagation delay	tPLH/tPHL ≤ 8.0 ns (VCC = 5.0 V, CL = 50 pF) - meets timing budgets for 25 MHz synchronous bus operations.
Pb-free SOIC-20W package	RoHS-compliant, JEDEC-standard footprint (Case 751D) - drop-in replaceable with legacy 74ACT541 variants and compatible with standard reflow profiles.

Applications

Industrial PLC Backplane Interface	Legacy Microprocessor I/O Expansion
Use Scenario: Driving 8-bit address/data buses between CPU module and I/O expansion cards in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control acts as bi-directional bus transceiver, isolating CPU from peripheral load variations while enabling hot-swap capability. Use Value: ±24 mA drive strength maintains signal integrity across 15 cm backplane traces; flow-through pinout simplifies 2-layer PCB routing without vias.	Use Scenario: Expanding GPIO capability of 8051 or Z80-based embedded controllers used in test equipment and instrumentation. IC Role / Device Role / Timing Role: Output port driver that latches and buffers CPU data writes to external peripherals (ADCs, DACs, displays) under OE-controlled enable timing. Use Value: Sub-10 ns propagation delay ensures setup/hold compliance with 12 MHz CPU bus cycles; TTL-compatible inputs eliminate need for external level shifters.
Memory Address Buffering	Industrial Clock Distribution
Use Scenario: Buffering 8-bit address lines from microcontroller to SRAM or EPROM in ruggedized industrial control panels operating at −40°C to +85°C. IC Role / Device Role / Timing Role: Address line driver providing noise immunity and current gain; 3-state outputs allow shared bus access among multiple memory devices. Use Value: Guaranteed operation over full industrial temperature range; ±5.0 μA 3-state leakage prevents address bus contention during memory select transitions.	Use Scenario: Distributing clean, low-skew clock signals from oscillator to multiple synchronous peripherals (UARTs, timers, ADCs) in factory automation controllers. IC Role / Device Role / Timing Role: Clock buffer isolating source from capacitive loading; noninverting function preserves clock polarity; 3-state enables dynamic clock gating. Use Value: 8 ns max propagation delay minimizes clock skew across 8 outputs; ±24 mA drive sustains edge rate into 50 pF total load per node.

Industrial PLC Backplane Interface

Legacy Microprocessor I/O Expansion

Use Scenario: Driving 8-bit address/data buses between CPU module and I/O expansion cards in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control acts as bi-directional bus transceiver, isolating CPU from peripheral load variations while enabling hot-swap capability.

Use Value: ±24 mA drive strength maintains signal integrity across 15 cm backplane traces; flow-through pinout simplifies 2-layer PCB routing without vias.

Use Scenario: Expanding GPIO capability of 8051 or Z80-based embedded controllers used in test equipment and instrumentation.

IC Role / Device Role / Timing Role: Output port driver that latches and buffers CPU data writes to external peripherals (ADCs, DACs, displays) under OE-controlled enable timing.

Use Value: Sub-10 ns propagation delay ensures setup/hold compliance with 12 MHz CPU bus cycles; TTL-compatible inputs eliminate need for external level shifters.

Memory Address Buffering

Industrial Clock Distribution

Use Scenario: Buffering 8-bit address lines from microcontroller to SRAM or EPROM in ruggedized industrial control panels operating at −40°C to +85°C.

IC Role / Device Role / Timing Role: Address line driver providing noise immunity and current gain; 3-state outputs allow shared bus access among multiple memory devices.

Use Value: Guaranteed operation over full industrial temperature range; ±5.0 μA 3-state leakage prevents address bus contention during memory select transitions.

Use Scenario: Distributing clean, low-skew clock signals from oscillator to multiple synchronous peripherals (UARTs, timers, ADCs) in factory automation controllers.

IC Role / Device Role / Timing Role: Clock buffer isolating source from capacitive loading; noninverting function preserves clock polarity; 3-state enables dynamic clock gating.

Use Value: 8 ns max propagation delay minimizes clock skew across 8 outputs; ±24 mA drive sustains edge rate into 50 pF total load per node.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal noninverting buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC74ACT541DWG	Identical electrical specs and pinout; differs only in marking (DWG vs MELG) and packaging - DWG uses standard SOIC-20 rail packaging, MELG uses tape-and-reel with different date code format.	No functional difference; both qualified for industrial temperature range (−40°C to +85°C) and Pb-free compliance.	Select MC74ACT541MELG for automated SMT assembly requiring tape-and-reel delivery; choose DWG for manual prototyping or small-batch hand soldering.
SN74ACT541N	Same logic function and DC specs, but in PDIP-20 package (0.300″ width, through-hole); propagation delay slightly higher (tPLH/tPHL ≤ 9.5 ns); no flow-through pinout - inputs/outputs interleaved.	PDIP-20 requires through-hole mounting and larger PCB area; unsuitable for high-density SMT layouts or automated assembly.	Choose SN74ACT541N only for breadboarding, legacy repair, or through-hole designs where SOIC-20 footprint is unavailable.

Compared with MC74ACT541MELG, MC74ACT541DWG offers identical performance in a different packaging format ideal for prototyping, while SN74ACT541N provides the same logic function in through-hole form but sacrifices flow-through layout efficiency and adds 1.5 ns timing overhead - making MC74ACT541MELG the optimal choice for space-constrained, high-speed SMT industrial bus interfaces.

Availability

MC74ACT541MELG is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microprocessor I/O expansion, memory address buffering, and industrial clock distribution requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC74ACT541MELG 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 specializing in energy-efficient power management, analog, logic, and discrete components for automotive, industrial, cloud, and IoT applications.

The MC74ACT541MELG belongs to onsemi's 74ACT advanced CMOS logic family, engineered for high-speed, low-power 5 V TTL-compatible interfacing in industrial and embedded systems where reliability and timing precision are critical.

FAQ

What is the supply voltage range for MC74ACT541MELG?

The MC74ACT541MELG operates over a strict 4.5 V to 5.5 V supply range. It is not characterized or guaranteed for 3.3 V operation. Using VCC below 4.5 V may result in undefined input thresholds, reduced output drive, and increased propagation delay beyond datasheet limits. Always maintain VCC within this window for compliant industrial operation.

Does MC74ACT541MELG support 3.3 V logic inputs?

No, MC74ACT541MELG does not reliably accept 3.3 V logic inputs. Its VIH minimum is 2.0 V at VCC = 5.5 V, but its input structure is optimized for TTL-compatible 5 V systems. A 3.3 V HIGH signal may fall below the guaranteed switching threshold, causing metastability or incorrect output states. Use level-shifting circuitry when interfacing with 3.3 V controllers.

What is the maximum output current per pin for MC74ACT541MELG?

The MC74ACT541MELG guarantees ±24 mA DC output current per pin under recommended operating conditions (VCC = 4.5–5.5 V, TA = −40°C to +85°C). This rating applies to both sourcing (IOH = −24 mA) and sinking (IOL = 24 mA) modes. Exceeding this value risks exceeding absolute maximum ratings and may degrade long-term reliability.

How are the output enable pins configured on MC74ACT541MELG?

MC74ACT541MELG has two active-low output enable inputs: OE1 (Pin 9) and OE2 (Pin 10). All eight outputs go to high-impedance state if either OE1 or OE2 is HIGH. Outputs are enabled only when both OE1 and OE2 are LOW. This dual-enable design allows flexible grouping - for example, using OE1 to control Y1–Y4 and OE2 for Y5–Y8 - though both are typically tied together.

Is MC74ACT541MELG pin-compatible with MC74AC541 variants?

Yes, MC74ACT541MELG is pin-compatible with MC74AC541 variants (e.g., MC74AC541DWG) in the same SOIC-20W package. Both share identical pinout, DC characteristics, and flow-through architecture. However, MC74ACT541MELG features TTL-compatible inputs and faster AC performance (e.g., 8.0 ns max tPLH vs 9.0 ns for AC version), making it a functional upgrade in timing-critical 5 V systems.

MC74ACT541MELG 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:: 1

Number of Bits per Element:: 8

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

MC74ACT541MELG FAQ

1.How can I place an order for MC74ACT541MELG through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74ACT541MELG 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 MC74ACT541MELG reliable?

The price and inventory of MC74ACT541MELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT541MELG is usually 5 days.

3.What payment methods are accepted for MC74ACT541MELG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT541MELG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74ACT541MELG?

MC74ACT541MELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74ACT541MELG 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 MC74ACT541MELG?

For technical support, including MC74ACT541MELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT541MELG requirements.

6.How does Aetrix verify that MC74ACT541MELG is sourced from the original manufacturer or authorized distributors?

All MC74ACT541MELG 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 MC74ACT541MELG meets industry standards.

7.What is the process for return or replacement of MC74ACT541MELG?

All MC74ACT541MELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT541MELG, 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 MC74ACT541MELG part is unused and in its original packaging.

Return procedure for MC74ACT541MELG:

1.Submit a request within 90 days.

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

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