74F543MSA Equivalent & Substitute Parts

Part Overview

The 74F543MSA is a non-inverting transceiver IC manufactured by onsemi, designed for 8-bit data transmission with 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 24-SSOP surface mount package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

74F543MSA

onsemiIn Stock: 75874F543MSA Datasheet

Current PartRFQ

SN74F543DBR

Texas InstrumentsIn Stock: 1233SN74F543DBR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74F543MSA is determined by strict alignment of the following critical parameters:

• Logic type classification: Transceiver, Non-Inverting
• Functional configuration: 1 Element, 8 Bits per Element
• Output architecture: 3-State output
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C
• Physical package: 24-SSOP surface mount form factor
• Base product series: 74F logic family

The SN74F543DBR from Texas Instruments satisfies all substitution criteria within these parameters.

Parameter Comparison

Engineering Selection Recommendations

The SN74F543DBR is the direct functional equivalent for the obsolete 74F543MSA. Both components share identical logic architecture, pin configuration, and electrical operating parameters within the 74F logic family specification.

The SN74F543DBR offers the advantage of active product status from Texas Instruments, ensuring continued availability and supply chain reliability. The component is RoHS3 compliant and carries REACH unaffected certification, meeting current environmental and regulatory requirements.

Output current specifications show a variance in the high-state output current (15mA versus 3mA), which remains within acceptable design margins for standard 74F logic applications. All other electrical characteristics, including supply voltage range, operating temperature, and low-state output current, are identical.

Frequently Asked Questions (FAQ)

Q: Can the SN74F543DBR directly replace the 74F543MSA in existing designs?

A: Yes. Both components are pin-compatible 24-SSOP packages with identical logic functionality, supply voltage requirements, and operating temperature ranges. No circuit modifications are required.

Q: What is the significance of the different output high current specifications?

A: The SN74F543DBR provides 15mA output high current compared to the 74F543MSA's 3mA. This represents improved drive capability and does not create compatibility issues in standard applications. Existing designs will function correctly with the higher current specification.

Q: Why is the 74F543MSA classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by onsemi. The SN74F543DBR from Texas Instruments provides continued access to this logic function through an active product line.

Q: Are there packaging differences between these parts?

A: No. Both components use the 24-SSOP surface mount package with identical dimensions (0.209" width, 5.30mm). PCB footprints and assembly processes remain unchanged.

Q: What compliance certifications apply to the SN74F543DBR?

A: The SN74F543DBR is RoHS3 compliant and REACH unaffected. Both components carry EAR99 export classification and the same HTSUS commodity code.