onsemi MC74HCT541ADWG

Overview

MC74HCT541ADWG from onsemi is an octal non-inverting 3-state buffer/line driver with TTL-compatible inputs and CMOS outputs, operating at 4.5–5.5 V supply, featuring 8 ns propagation delay (max) at 5 V and ±4 mA output drive capability. It serves as a bidirectional bus interface in microcontroller peripheral expansion systems.

For engineers reviewing the MC74HCT541ADWG datasheet, pinout, applications, or equivalent options, key selection considerations include input threshold compatibility with 5 V TTL logic, guaranteed 3-state isolation leakage (< 1 µA), rail-to-rail output swing, and SOIC-20 package thermal performance for industrial temperature operation.

Technical Context

This device implements eight independent non-inverting buffer channels, each with separate 3-state control (1OE, 2OE) enabling true bidirectional bus buffering. Input thresholds are fixed at V_IL = 0.8 V (max) and V_IH = 2.0 V (min), ensuring robust noise immunity against TTL-level signals.

All outputs exhibit symmetrical rise/fall times (typ. 7 ns at C_L = 50 pF), support hot insertion via power-up 3-state default, and maintain output disable current < 1 µA over −40 °C to +85 °C ambient range without external pull-ups.

Key Specifications

Pinout & Package

MC74HCT541ADWG is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 0.300-inch body width, 1.27 mm lead pitch, and JEDEC MS-013AC compliant footprint. Thermal resistance θ_JA = 110 °C/W enables continuous operation at full output loading within industrial ambient limits.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal non-inverting buffer applications.

Compared with SN74HCT244N and 74VHC541M, the MC74HCT541ADWG uniquely balances TTL input compatibility, SOIC-20 manufacturability, and industrial temperature assurance - making it the optimal choice for retrofitting legacy 5 V bus systems without layout changes or signal integrity compromises.

Availability

MC74HCT541ADWG is available at Aetrix Electronics and suitable for industrial control panels, programmable logic interfaces, and microcontroller I/O expansion requiring stable component supply across extended lifecycle programs.

Supply support for MC74HCT541ADWG 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 leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and edge applications.

The MC74HCT541ADWG belongs to onsemi's HCT logic family, engineered specifically for seamless interoperability between TTL-based legacy systems and modern CMOS-based controllers in industrial and infrastructure equipment.

FAQ

What is the maximum clock frequency supported by MC74HCT541ADWG in bus applications?

The MC74HCT541ADWG does not operate on a clock signal-it is a combinatorial buffer. Its 8 ns maximum propagation delay at 5 V supports reliable operation in asynchronous bus systems up to approximately 12 MHz (based on round-trip timing budget). For synchronous protocols like SPI or parallel memory access, system timing must account for both setup/hold and propagation delays; the MC74HCT541ADWG itself imposes no internal clock constraint.

Does MC74HCT541ADWG require external pull-up or pull-down resistors on its inputs or outputs?

No, the MC74HCT541ADWG does not require external pull-up or pull-down resistors. Its inputs feature internal weak pull-downs that ensure a defined logic low state during power-up or floating conditions. Outputs are CMOS push-pull and drive rail-to-rail; external termination is only needed for impedance matching on long transmission lines-not for basic logic functionality. The MC74HCT541ADWG operates correctly with all inputs actively driven.

Can MC74HCT541ADWG be used to interface 3.3 V microcontrollers with 5 V peripherals?

No, the MC74HCT541ADWG is not suitable for 3.3 V to 5 V level translation. Its inputs are TTL-compatible (V_IH ≥ 2.0 V), but its minimum supply voltage is 4.5 V-so it cannot be powered from 3.3 V. Driving its inputs with 3.3 V logic may result in marginal or undefined switching behavior. For 3.3 V ↔ 5 V interfacing, dedicated level translators such as the NTS0102 or TXB0108 are required instead of the MC74HCT541ADWG.

What is the power dissipation of MC74HCT541ADWG under full load at 5 V?

At V_CC = 5 V with all eight outputs driving ±4 mA into resistive loads and all inputs switching at 1 MHz, the MC74HCT541ADWG dissipates approximately 25 mW typical (I_CC ≈ 5 mA). Quiescent supply current is 2 µA typical. Power dissipation remains well within SOIC-20 thermal limits (θ_JA = 110 °C/W) even with sustained 50 pF bus capacitance and 10 MHz toggle rates-no heatsink required for standard industrial deployment of the MC74HCT541ADWG.

Is MC74HCT541ADWG RoHS compliant and halogen-free?

Yes, the MC74HCT541ADWG is RoHS compliant and halogen-free per onsemi's material declarations. It meets EU Directive 2011/65/EU (RoHS 2) and contains < 900 ppm bromine and < 900 ppm chlorine in homogeneous materials. Certificate of Compliance and detailed substance disclosure reports are available upon request for the MC74HCT541ADWG through Aetrix Electronics' technical support portal.