onsemi MC74HC541AFELG

Overview

MC74HC541AFELG from onsemi is an octal 3-state noninverting buffer/line driver with CMOS logic compatibility, 2.0–6.0 V operating range, ±7.8 mA output drive at 6 V, and dual active-low output enables (OE1/OE2). It functions as a bus-oriented interface device in memory address/data paths and clock distribution networks.

For engineers reviewing the MC74HC541AFELG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, SOIC-20 pin mapping, JEDEC-compliant noise immunity, propagation delay (15 ns @ 6 V), and real-world substitution guidance for industrial and automotive bus systems.

Technical Context

The MC74HC541AFELG implements eight independent noninverting buffers with high-impedance outputs controlled by two ANDed active-low enables-OE1 and OE2-requiring both to be low for output activation. Its input structure supports direct interfacing with standard CMOS outputs and, with external pull-ups, LSTTL outputs.

Designed as a drop-in replacement for LS541, it features opposite-side I/O placement (inputs on left, outputs on right), 134-FET silicon-gate CMOS architecture, and compliance with JEDEC Std No. 7A. It operates across –55°C to +125°C with latch-up immunity ≥±100 mA.

Key Specifications

Pinout & Package

MC74HC541AFELG is housed in a Pb-free SOIC-20 wide-body package (Case 751D), 12.95 mm × 7.60 mm × 2.65 mm, with 1.27 mm pitch, moisture sensitivity level 3, and lead finish matte tin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC541N and 74VHC541M, the MC74HC541AFELG offers superior thermal resilience (–55°C to +125°C), tighter leakage control (±10 μA 3-state max), and documented AEC-Q100 pathway via -Q variants - making it the preferred choice for mission-critical industrial and automotive bus interfaces.

Availability

MC74HC541AFELG is available at Aetrix Electronics and suitable for memory subsystems, microcontroller peripheral expansion, industrial PLC backplanes, and automotive ECU signal routing requiring stable component supply and long-term lifecycle assurance.

Supply support for MC74HC541AFELG 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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The MC74HC541AFELG belongs to onsemi's high-performance HC logic family, engineered for reliable bus interfacing in harsh environments - emphasizing noise immunity, wide voltage operation, and industrial temperature resilience.

FAQ

What is the maximum operating voltage for MC74HC541AFELG?

The MC74HC541AFELG supports a DC supply voltage range of 2.0 V to 6.0 V, with absolute maximum rating of +6.5 V. Operation above 6.0 V is not recommended and may compromise reliability or violate JEDEC Std No. 7A compliance. The device delivers specified performance-including 15 LSTTL load drive and 15 ns propagation delay-within the 2.0–6.0 V window, making MC74HC541AFELG suitable for both 3.3 V and 5 V system designs without external level translation.

Does MC74HC541AFELG support true bidirectional data flow?

No, MC74HC541AFELG is a unidirectional noninverting buffer: data flows only from A1–A8 inputs to Y1–Y8 outputs. It does not implement internal direction control or bus transceiver logic. However, its 3-state outputs allow it to share a common bus line with other drivers-enabling time-multiplexed bidirectional communication when coordinated with external control logic. This behavior is inherent to the MC74HC541AFELG's architecture and confirmed in its function table and pin descriptions.

What is the purpose of having two output enable pins (OE1 and OE2) on MC74HC541AFELG?

The MC74HC541AFELG uses two active-low output enables (OE1 and OE2) that are internally ANDed: both must be LOW to activate Y1–Y8 outputs. This design provides flexible hardware-level bus arbitration-e.g., one enable can be tied to a chip-select signal and the other to a system-wide bus grant line. If either OE1 or OE2 goes HIGH, all outputs enter high-impedance state. This dual-enable structure is explicitly defined in the MC74HC541AFELG datasheet function table and logic diagram, distinguishing it from single-enable alternatives.

Is MC74HC541AFELG compatible with LSTTL logic inputs?

MC74HC541AFELG inputs are compatible with standard CMOS outputs by default. To interface with LSTTL outputs, external pull-up resistors (typically 10 kΩ to VCC) are required on each input to ensure VIH ≥1.5 V at VCC = 2.0 V. This requirement is explicitly stated in the MC74HC541AFELG datasheet and validated across the full operating temperature range. Without pull-ups, LSTTL outputs may fail to meet the minimum high-level input voltage threshold, causing unreliable logic recognition.

What package type is used for MC74HC541AFELG?

MC74HC541AFELG is packaged in a Pb-free SOIC-20 wide-body (Case 751D), measuring 12.95 mm × 7.60 mm × 2.65 mm with 1.27 mm lead pitch. This package is distinct from narrow SOIC or TSSOP variants and is confirmed by the ordering information table in the official onsemi datasheet. The "FELG" suffix specifically denotes this SOIC-20 WB configuration with RoHS-compliant matte tin plating and moisture sensitivity level 3.