74F543MSAX Equivalent & Substitute Parts

Part Overview

The 74F543MSAX is a non-inverting transceiver IC manufactured by onsemi, designed for 8-bit data transmission with 3-state output capability. This component operates within the 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

74F543MSAX

onsemiIn Stock: 112874F543MSAX Datasheet

Current PartRFQ

SN74F543DBR

Texas InstrumentsIn Stock: 1233SN74F543DBR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74F543MSAX is determined by strict alignment of the following parameters:

• Logic type and function: Transceiver, Non-Inverting configuration
• Bit width and element count: 1 element, 8 bits per element
• Output architecture: 3-State output capability
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C
• Package specification: 24-SSOP surface mount form factor
• Pin count and mechanical dimensions: 24-pin, 0.209" width, 5.30mm

The SN74F543DBR from Texas Instruments meets all specified electrical and mechanical parameters, establishing it as a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

The SN74F543DBR from Texas Instruments is the qualified substitute for the obsolete 74F543MSAX. Both components share identical functional specifications, electrical parameters, and mechanical packaging. The SN74F543DBR maintains active product status with current manufacturing support, ensuring long-term availability and supply chain continuity.

The SN74F543DBR carries RoHS3 compliance certification, providing enhanced environmental and regulatory alignment compared to the original part. Both components are REACH unaffected and classified under ECCN EAR99, maintaining consistent export control and regulatory standing.

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

Frequently Asked Questions (FAQ)

Q: Can the SN74F543DBR directly replace the 74F543MSAX without PCB modifications?

A: Yes. Both components use identical 24-SSOP packaging with matching pin assignments, mechanical dimensions, and electrical specifications. Direct pin-for-pin substitution is supported without PCB layout changes.

Q: What is the significance of the product status difference (Obsolete vs. Active)?

A: The 74F543MSAX is obsolete and no longer manufactured by onsemi. The SN74F543DBR is actively produced by Texas Instruments, ensuring reliable component availability for new procurement and system maintenance.

Q: Are there compliance or certification differences between these parts?

A: The SN74F543DBR includes RoHS3 compliance certification. Both parts maintain REACH unaffected status and EAR99 export classification. The SN74F543DBR provides enhanced environmental compliance for regulated applications.

Q: How do the output current specifications affect circuit design?

A: The SN74F543DBR provides higher output current in the high state (15mA versus 3mA). This represents improved drive capability and does not restrict compatibility with existing designs. Applications designed for the 74F543MSAX will operate within the SN74F543DBR specifications.

Q: Is the 24-SSOP package suitable for automated assembly?

A: Yes. Both the 74F543MSAX and SN74F543DBR are surface mount components in 24-SSOP packaging, compatible with standard pick-and-place assembly equipment and reflow soldering processes.

Q: What is the Moisture Sensitivity Level (MSL) rating?

A: Both components carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply without special environmental controls.