74F543SCX Equivalent & Substitute Parts

Part Overview

The 74F543SCX 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-SOP package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

74F543SCX

onsemiIn Stock: 166774F543SCX Datasheet

Current PartRFQ

SN74F543DW

Texas InstrumentsIn Stock: 10343SN74F543DW Datasheet

DirectRFQ

SN74F543DWR

Texas InstrumentsIn Stock: 4011SN74F543DWR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74F543SCX is determined by strict alignment of the following electrical and mechanical parameters:

• Logic type: Transceiver, Non-Inverting
• Number of elements: 1
• Number of bits per element: 8
• Output type: 3-State
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C
• Package type: 24-SOIC form factor
• Mounting type: Surface Mount

The substitute parts SN74F543DW and SN74F543DWR, both manufactured by Texas Instruments, meet all specified electrical and mechanical requirements. Both parts maintain identical functional specifications and package dimensions, differing only in packaging format (Tube versus Tape & Reel) and product lifecycle status.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the 74F543SCX, the SN74F543DWR represents the primary substitute option. This part maintains active product status with Texas Instruments, ensuring long-term availability and supply chain stability. The SN74F543DWR is ROHS3 compliant and supplied in Tape & Reel format, standard for automated assembly operations.

The SN74F543DW serves as a secondary option, available in Tube packaging with Last Time Buy status from Texas Instruments. This part is suitable for lower-volume applications or situations where Tape & Reel packaging is not required.

Both Texas Instruments alternatives satisfy all electrical and mechanical compatibility requirements with the obsolete onsemi 74F543SCX, enabling direct functional replacement in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the SN74F543DW and SN74F543DWR be used interchangeably with the 74F543SCX?

A: Yes. Both parts are electrically and mechanically equivalent. The difference between SN74F543DW and SN74F543DWR is packaging format only: Tube versus Tape & Reel. Selection depends on assembly method and volume requirements.

Q: What is the significance of the output current difference between the 74F543SCX and the Texas Instruments substitutes?

A: The 74F543SCX specifies output low current at 24mA, while SN74F543DW and SN74F543DWR specify 15mA. Both values remain within acceptable operating ranges for 74F logic family applications. The Texas Instruments specification represents a tighter, more conservative rating.

Q: Are there any compliance differences between the original and substitute parts?

A: The Texas Instruments substitutes (SN74F543DW and SN74F543DWR) carry ROHS3 compliance certification. The onsemi 74F543SCX does not specify RoHS status. Both parts are REACH Unaffected and carry EAR99 ECCN classification.

Q: Which substitute should be selected for new designs?

A: The SN74F543DWR is recommended for new designs. It maintains active product status, ensuring availability throughout the design lifecycle and into production phases.

Q: Is the 24-SOIC package identical across all three parts?

A: Yes. All three parts use the 24-SOIC package with 0.295" width and 7.50mm body dimension, ensuring identical PCB footprint and assembly compatibility.