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

onsemi MC74AC541N

Name: MC74AC541N
Brand: onsemi
SKU: MC74AC541N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74AC541N

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-DIP (0.300", 7.62mm)

Datasheet:: MC74AC541N.pdf

Description:: IC BUFF NON-INVERT 6V 20DIP

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Product details

Overview

MC74AC541N 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 from 2.0 V to 6.0 V, delivers ±24 mA output drive, features flow-through pinout (inputs on one side, outputs on the other), and supports industrial temperature range (−40°C to +85°C).

For engineers reviewing the MC74AC541N datasheet, pinout, applications, or equivalent options, key selection criteria include 3-state control timing (tPZH/tPLZ), DC drive capability (IOH/IOL), supply voltage flexibility (2.0–6.0 V), thermal performance (θJA = 96°C/W in SOIC-20), and compatibility with legacy TTL-level systems via AC logic family characteristics.

Technical Context

The MC74AC541N implements eight independent noninverting buffers, each with dual 3-state enable inputs (OE1 and OE2) controlling all outputs simultaneously. Its flow-through architecture places inputs on pins 1–10 and outputs on pins 11–20, enabling direct microprocessor bus connection without signal layer crossover.

It uses advanced CMOS technology to achieve AC541-specific propagation delays (e.g., tPLH = 4.0 ns typ at VCC = 5.0 V, CL = 50 pF) and fast 3-state switching (tPZH = 6.5 ns typ, tPHZ = 7.5 ns typ), while maintaining rail-to-rail input thresholds and low quiescent current (ICC ≤ 80 µA).

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	74AC - CMOS-compatible with TTL input thresholds; enables mixed-voltage system interfacing.
Supply Voltage Range	2.0 V to 6.0 V - supports wide-input operation across 3.3 V and 5 V systems without level shifters.
Output Drive	±24 mA per output - sufficient to drive standard TTL loads or multiple CMOS inputs directly.
Propagation Delay	4.0 ns typical (tPLH/tPHL at 5.0 V, CL = 50 pF) - ensures tight timing margins in high-speed address/data buses.
3-State Enable Time	6.5 ns typical (tPZH at 5.0 V) - minimizes bus contention window during output activation.
Input Capacitance	4.5 pF - reduces capacitive loading on driving sources, preserving signal integrity in fan-out-critical paths.
Thermal Resistance	96°C/W (θJA, SOIC-20) - enables reliable operation at full load in ambient temperatures up to +85°C.

Pinout & Package

MC74AC541N is housed in a 20-pin SOIC Wide Body (SOIC-20WB, Case 751D) package measuring 12.8 mm × 7.5 mm × 2.5 mm, with 1.27 mm pitch and Pb-free finish (G suffix).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	Input A1–A8	Noninverting data inputs; accept 2.0–6.0 V logic levels with VIH = 2.1 V min (VCC = 3.0 V).
9, 10	OE1, OE2	Active-low 3-state enable controls; both must be LOW for outputs to drive; HIGH places outputs in high-impedance state.
11, 12, 13, 14, 15, 16, 17, 18	Output Y1–Y8	Noninverted buffered outputs; sink/source ±24 mA; VOL ≤ 0.44 V at IOL = 24 mA (VCC = 5.5 V).
20	VCC	Positive supply pin; decoupling capacitor required near pin for noise suppression in high-speed switching.
10	GND	Ground reference; shared return path for all inputs, outputs, and internal circuitry.

Key Features

Feature	Design Value
Flow-through pinout	Inputs on left side (pins 1–10), outputs on right side (pins 11–20) - eliminates PCB trace crossovers and simplifies microprocessor bus routing.
High-output drive	±24 mA per output - drives 10+ TTL loads or 20+ CMOS inputs without external buffering.
Low quiescent current	ICC ≤ 80 µA max - reduces standby power in battery-backed or energy-sensitive applications.
Wide supply range	2.0 V to 6.0 V operation - enables interoperability between 3.3 V controllers and 5 V peripherals.
Pb-free packaging	RoHS-compliant SOIC-20WB (Case 751D) - meets global environmental compliance requirements without derating.

Applications

Memory Address Buffering	Microprocessor Output Port
Use Scenario: Driving 16-bit address bus lines from a microcontroller to SRAM or EPROM chips. IC Role / Device Role / Timing Role: Noninverting octal buffer providing level translation and fan-out amplification with precise 3-state control synchronized to memory access cycles. Use Value: Eliminates need for discrete transistors or additional logic; enables clean address strobing with <6.5 ns enable delay and <7.5 ns disable delay.	Use Scenario: Expanding GPIO capability of an 8-bit MCU to drive external peripherals like LCDs or LED arrays. IC Role / Device Role / Timing Role: Bidirectional-capable output port extender using 3-state control to isolate MCU pins during peripheral readback or shared-bus operation. Use Value: Provides ±24 mA per line - sufficient to drive LEDs directly or interface with 5 V logic without series resistors or level shifters.
Bus Transceiver Interface	Industrial Control Backplane
Use Scenario: Isolating and conditioning data signals between two asynchronous subsystems on a shared parallel bus. IC Role / Device Role / Timing Role: Unidirectional bus driver with simultaneous 3-state control (OE1/OE2) preventing bus contention during arbitration or reset sequences. Use Value: Ensures deterministic high-impedance state transition within 12 ns max disable time - critical for glitch-free bus handoff.	Use Scenario: Interfacing PLC I/O modules to a central controller over a ruggedized 24 V-tolerant backplane. IC Role / Device Role / Timing Role: Signal conditioner and level translator between 5 V logic and isolated field-side drivers, leveraging wide VCC range and robust ESD rating (>2 kV HBM). Use Value: Operates reliably across −40°C to +85°C ambient with no derating; supports long-term deployment in uncooled enclosures.

Memory Address Buffering

Microprocessor Output Port

Use Scenario: Driving 16-bit address bus lines from a microcontroller to SRAM or EPROM chips.

IC Role / Device Role / Timing Role: Noninverting octal buffer providing level translation and fan-out amplification with precise 3-state control synchronized to memory access cycles.

Use Value: Eliminates need for discrete transistors or additional logic; enables clean address strobing with <6.5 ns enable delay and <7.5 ns disable delay.

Use Scenario: Expanding GPIO capability of an 8-bit MCU to drive external peripherals like LCDs or LED arrays.

IC Role / Device Role / Timing Role: Bidirectional-capable output port extender using 3-state control to isolate MCU pins during peripheral readback or shared-bus operation.

Use Value: Provides ±24 mA per line - sufficient to drive LEDs directly or interface with 5 V logic without series resistors or level shifters.

Bus Transceiver Interface

Industrial Control Backplane

Use Scenario: Isolating and conditioning data signals between two asynchronous subsystems on a shared parallel bus.

IC Role / Device Role / Timing Role: Unidirectional bus driver with simultaneous 3-state control (OE1/OE2) preventing bus contention during arbitration or reset sequences.

Use Value: Ensures deterministic high-impedance state transition within 12 ns max disable time - critical for glitch-free bus handoff.

Use Scenario: Interfacing PLC I/O modules to a central controller over a ruggedized 24 V-tolerant backplane.

IC Role / Device Role / Timing Role: Signal conditioner and level translator between 5 V logic and isolated field-side drivers, leveraging wide VCC range and robust ESD rating (>2 kV HBM).

Use Value: Operates reliably across −40°C to +85°C ambient with no derating; supports long-term deployment in uncooled enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC74ACT541N	TTL-compatible inputs (VIH = 2.0 V, VIL = 0.8 V at VCC = 5 V); otherwise identical pinout, timing, and drive.	Better suited for mixed-logic systems where upstream drivers are standard TTL or LS devices.	Select MC74ACT541N when interfacing with legacy 5 V TTL sources; MC74AC541N preferred for pure CMOS or wide-VCC designs.
SN74LVC244APWR	3.3 V only (1.65–3.6 V), lower drive (±24 mA), different pinout (non-flow-through), and Schmitt-trigger inputs optional.	Designed for modern low-voltage embedded systems; lacks 5 V tolerance and industrial temp support.	Choose SN74LVC244APWR only for 3.3 V-only designs requiring ultra-low power; not drop-in compatible due to voltage and pinout mismatch.

Compared with MC74ACT541N, MC74AC541N offers broader supply range (2.0–6.0 V vs. 4.5–5.5 V) but less TTL noise margin; versus SN74LVC244APWR, it provides 5 V operation and industrial temperature support but consumes more static power and occupies larger board area.

Availability

MC74AC541N is available at Aetrix Electronics and suitable for memory subsystem design, microprocessor I/O expansion, and industrial backplane interfacing requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for MC74AC541N 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 sensor solutions for automotive, industrial, and computing markets.

The MC74AC541N belongs to onsemi's legacy 74AC logic family, engineered for high-speed, low-power, and wide-supply-voltage operation in industrial and embedded control applications where reliability and interoperability are critical.

FAQ

What is the maximum operating supply voltage for MC74AC541N?

The MC74AC541N supports a DC supply voltage range of −0.5 V to +6.5 V, with recommended operation from 2.0 V to 6.0 V. At VCC = 6.0 V, VOH remains ≥5.4 V and VOL ≤ 0.44 V under full load (IOL = 24 mA), ensuring robust noise margins in 5 V systems. Exceeding 6.5 V risks permanent damage per absolute maximum ratings.

Does MC74AC541N support true 3-state operation with independent enable control?

No - MC74AC541N uses dual active-low 3-state enable inputs (OE1 and OE2) that must both be LOW to activate outputs; if either is HIGH, all eight outputs enter high-impedance state. This synchronous enable architecture prevents partial bus driving and simplifies control logic compared to per-channel enables.

Can MC74AC541N drive standard TTL loads directly?

Yes - MC74AC541N delivers ±24 mA per output, exceeding the ±1.6 mA requirement of standard TTL (74LS) inputs. At VCC = 5.0 V, it guarantees VOH ≥ 4.4 V and VOL ≤ 0.44 V into 24 mA loads, satisfying TTL VOH/VOL thresholds with margin. Its 74AC logic family also accepts TTL-level inputs (VIH = 2.1 V min at VCC = 3.0 V).

What is the thermal resistance (θJA) of MC74AC541N in its SOIC-20 package?

The MC74AC541N in SOIC-20WB (Case 751D) has a junction-to-ambient thermal resistance (θJA) of 96°C/W, measured per JESD 51-7. This value assumes standard JEDEC 2S2P test board conditions and allows full-output operation at TA = +85°C with ≤100 mW total power dissipation, verified by ICC ≤ 80 µA and CPD = 30 pF.

Is MC74AC541N pin-compatible with MC74AC540N?

No - MC74AC541N and MC74AC540N share identical pinout and package but differ functionally: MC74AC541N provides noninverting outputs, while MC74AC540N provides inverting outputs. Both use the same OE1/OE2 control scheme and electrical specifications, so PCB layout is identical, but logic inversion must be accounted for in system design.

MC74AC541N Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74AC

Package/Case:: 20-DIP (0.300", 7.62mm)

Packaging:: Tube

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:: 2V ~ 6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 20-PDIP

MC74AC541N FAQ

1.How can I place an order for MC74AC541N through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74AC541N 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 MC74AC541N reliable?

The price and inventory of MC74AC541N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74AC541N is usually 5 days.

3.What payment methods are accepted for MC74AC541N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74AC541N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74AC541N?

MC74AC541N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74AC541N 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 MC74AC541N?

For technical support, including MC74AC541N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74AC541N requirements.

6.How does Aetrix verify that MC74AC541N is sourced from the original manufacturer or authorized distributors?

All MC74AC541N 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 MC74AC541N meets industry standards.

7.What is the process for return or replacement of MC74AC541N?

All MC74AC541N units undergo pre-shipment inspection (PSI). If there is an issue with MC74AC541N, 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 MC74AC541N part is unused and in its original packaging.

Return procedure for MC74AC541N:

1.Submit a request within 90 days.

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

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