74ACQ543SC Equivalent & Substitute Parts

Part Overview

The 74ACQ543SC is a non-inverting transceiver IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. This 24-SOP surface mount device operates across a 2V to 6V supply voltage range and is rated for -40°C to 85°C operating temperature. The product is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and component procurement.

Substiute Parts

74ACQ543SC

onsemiIn Stock: 91174ACQ543SC Datasheet

Current PartRFQ

MC74AC646DWG

onsemiIn Stock: 2069MC74AC646DWG Datasheet

Parametric EquivalentRFQ

SN74ABT652ADWR

Texas InstrumentsIn Stock: 4930SN74ABT652ADWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACQ543SC are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

• Logic type: Transceiver, Non-Inverting
• Number of elements: 1
• Number of bits per element: 8
• Output type: 3-State
• Package / Case: 24-SOIC (0.295", 7.50mm Width)
• Mounting type: Surface Mount
• Operating temperature range: -40°C ~ 85°C (TA)

The MC74AC646DWG is a parametric equivalent, matching all core electrical specifications and package requirements. The SN74ABT652ADWR is classified as a similar substitute with compatible logic function and package, though with different voltage supply range and output current specifications.

Parameter Comparison

Engineering Selection Recommendations

The MC74AC646DWG provides the closest parametric match to the 74ACQ543SC, with identical electrical specifications and package configuration. Both devices are obsolete onsemi products. The MC74AC646DWG offers improved compliance status with ROHS3 certification, whereas the original 74ACQ543SC is RoHS non-compliant.

The SN74ABT652ADWR from Texas Instruments is an active product with ROHS3 compliance and identical package geometry. This device features higher output current capability (32mA/64mA versus 24mA/24mA) and operates within a narrower supply voltage range (4.5V ~ 5.5V versus 2V ~ 6V). Selection of the SN74ABT652ADWR requires verification that the system supply voltage remains within the 4.5V to 5.5V window and that the increased output current does not introduce thermal or signal integrity concerns.

Frequently Asked Questions (FAQ)

Q: Can the MC74AC646DWG directly replace the 74ACQ543SC?

A: Yes. The MC74AC646DWG matches all critical electrical parameters including supply voltage range (2V ~ 6V), output current (24mA, 24mA), operating temperature (-40°C ~ 85°C), and package configuration (24-SOIC). Both are surface mount devices with identical pinout and functional specifications.

Q: What are the key differences between the 74ACQ543SC and SN74ABT652ADWR?

A: The primary differences are supply voltage range and output current. The SN74ABT652ADWR operates at 4.5V ~ 5.5V (narrower than the 2V ~ 6V range of the 74ACQ543SC) and provides higher output current (32mA/64mA versus 24mA/24mA). The SN74ABT652ADWR is an active product with current manufacturing support, whereas the 74ACQ543SC is obsolete.

Q: Are package dimensions identical across all three parts?

A: Yes. All three devices use the 24-SOIC package with 0.295" width and 7.50mm width specification, ensuring mechanical compatibility on existing PCB layouts.

Q: Which substitute part should be selected for new designs?

A: Selection depends on system voltage requirements. If the system operates within 4.5V to 5.5V, the SN74ABT652ADWR is preferred due to active product status and ROHS3 compliance. If the system requires operation across the full 2V to 6V range, the MC74AC646DWG is the appropriate choice.

Q: What is the compliance status of each part?

A: The 74ACQ543SC is RoHS non-compliant. Both the MC74AC646DWG and SN74ABT652ADWR are ROHS3 compliant. All three parts are REACH unaffected and classified as EAR99 for export control purposes.