74ABT543CMTC Equivalent & Substitute Parts

Part Overview

The 74ABT543CMTC is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. Designed for 4.5V to 5.5V supply operation with 32mA/64mA output drive capability, this component operates across the -40°C to 85°C temperature range in a 24-TSSOP surface mount package.

The 74ABT543CMTC is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements.

Key Parameters

Parameter	Value
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	32mA, 64mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	24-TSSOP (0.173", 4.40mm Width)
Series	74ABT
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74ABT543CMTC is determined by the following critical parameters:

Logic Type & Function: Transceiver, Non-Inverting configuration with identical element and bit-per-element count
Electrical Performance: Matching output drive current (32mA/64mA), supply voltage range (4.5V ~ 5.5V), and operating temperature range (-40°C ~ 85°C)
Package Compatibility: Surface mount technology with compatible footprint dimensions
Series Alignment: 74ABT logic family membership

All identified substitute parts maintain these core parameters. Variations in packaging format (Tape & Reel vs. Tube) and product status (Active vs. Obsolete) do not affect electrical or functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package Type	Package / Case	Logic Type	Elements / Bits	Output Type	Current (High/Low)	Supply Voltage	Temp Range	RoHS Status
74ABT543CMTC	onsemi	Obsolete	-	24-TSSOP (0.173", 4.40mm)	Transceiver, Non-Inverting	1 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	-
SN74ABT543ADBR	Texas Instruments	Active	Tape & Reel (TR)	24-SSOP (0.209", 5.30mm)	Transceiver, Non-Inverting	1 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	ROHS3 Compliant
SN74ABT543APWR	Texas Instruments	Active	Tape & Reel (TR)	24-TSSOP (0.173", 4.40mm)	Transceiver, Non-Inverting	1 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	ROHS3 Compliant
SN74ABT543APW	Texas Instruments	Active	Tube	24-TSSOP (0.173", 4.40mm)	Transceiver, Non-Inverting	1 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	ROHS3 Compliant
SN74ABT646APW	Texas Instruments	Active	Tube	24-TSSOP (0.173", 4.40mm)	Transceiver, Non-Inverting	1 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	ROHS3 Compliant
SN74ABT646PW	Texas Instruments	Active	Tube	24-TSSOP (0.173", 4.40mm)	Transceiver, Non-Inverting	1 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Identical Package)

SN74ABT543APWR and SN74ABT543APW are direct functional equivalents with identical 24-TSSOP packaging. Both are manufactured by Texas Instruments and carry Active product status with ROHS3 compliance. Selection between these two depends on packaging format requirements: Tape & Reel (APWR) for automated assembly or Tube (APW) for manual handling.

Package Variant Substitute

SN74ABT543ADBR provides electrical equivalence with a 24-SSOP package variant (0.209" width vs. 0.173" for TSSOP). This part is suitable only if PCB layout accommodates the wider package footprint. Texas Instruments Active status and ROHS3 compliance apply.

Base Product Number Alternatives

SN74ABT646APW and SN74ABT646PW share identical electrical specifications and packaging with the 74ABT543 variants but carry the 74ABT646 base product designation. Both are Active status with ROHS3 compliance. These parts are functionally compatible within the 74ABT transceiver family.

All substitute parts maintain compliance with REACH and EAR99 export classifications consistent with the original 74ABT543CMTC.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT543ADBR replace 74ABT543CMTC directly on the PCB?

A: SN74ABT543ADBR is electrically equivalent but uses a 24-SSOP package (0.209" width) instead of 24-TSSOP (0.173" width). PCB footprint compatibility must be verified before substitution. If the original design uses 24-TSSOP landing patterns, SN74ABT543APWR or SN74ABT543APW are preferred.

Q: What is the difference between SN74ABT543APWR and SN74ABT543APW?

A: Both parts are electrically and functionally identical with matching 24-TSSOP packaging. The difference is packaging format: APWR is supplied in Tape & Reel format for automated pick-and-place assembly, while APW is supplied in Tube format for manual component handling.

Q: Are SN74ABT646 parts compatible with designs using 74ABT543?

A: SN74ABT646APW and SN74ABT646PW maintain identical electrical specifications, output drive capability, supply voltage, temperature range, and 24-TSSOP packaging. They are functionally compatible within the 74ABT transceiver logic family.

Q: Why is 74ABT543CMTC listed as Obsolete?

A: The original onsemi part is no longer in active production. Texas Instruments maintains active production of equivalent 74ABT543 and 74ABT646 variants, ensuring continued supply chain availability.

Q: Do all substitute parts meet RoHS compliance?

A: All Texas Instruments substitute parts carry ROHS3 Compliant status. The original 74ABT543CMTC does not specify RoHS status in available documentation.

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