74ABT543CMSA Equivalent & Substitute Parts

Part Overview

The 74ABT543CMSA is a non-inverting transceiver IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 24-SSOP package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74ABT543CMSA are qualified based on strict electrical and mechanical parameter matching:

Core Substitution Criteria:

Logic type: Transceiver, Non-Inverting
Element and bit configuration: 1 element, 8 bits per element
Output type: 3-State
Output current specifications: 32mA (high), 64mA (low)
Supply voltage range: 4.5V ~ 5.5V
Operating temperature range: -40°C ~ 85°C
Mounting type: Surface Mount
Moisture sensitivity level: 1 (Unlimited)
Base product number: 74ABT543

Substitute parts are grouped into two package variants: 24-SSOP and 24-TSSOP. Both package types maintain identical electrical specifications and are mechanically compatible within their respective package families.

Parameter Comparison

Parameter	74ABT543CMSA (onsemi)	SN74ABT543ADBR (TI)	SN74ABT543APW (TI)	SN74ABT543APWR (TI)
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active
Logic Type	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting
Number of Elements	1	1	1	1
Number of Bits per Element	8	8	8	8
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	24-SSOP (0.209", 5.30mm Width)	24-SSOP (0.209", 5.30mm Width)	24-TSSOP (0.173", 4.40mm Width)	24-TSSOP (0.173", 4.40mm Width)
Packaging Type	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99	EAR99

Engineering Selection Recommendations

For 24-SSOP Package Requirement: SN74ABT543ADBR (Texas Instruments) is the direct substitute for the 74ABT543CMSA. This part maintains identical package dimensions (24-SSOP, 0.209" width, 5.30mm) and all electrical specifications. The SN74ABT543ADBR carries active product status and ROHS3 compliance, providing long-term availability and regulatory alignment.

For 24-TSSOP Package Alternative: SN74ABT543APW and SN74ABT543APWR (Texas Instruments) provide functional equivalence with a narrower package footprint (24-TSSOP, 0.173" width, 4.40mm). Both parts maintain identical electrical performance and operating characteristics. SN74ABT543APWR is supplied in Tape & Reel format for automated assembly, while SN74ABT543APW is supplied in Tube format. Both carry active product status and ROHS3 compliance.

All substitute parts share identical electrical specifications, supply voltage ranges, output current ratings, and operating temperature ranges with the original 74ABT543CMSA. Selection between substitutes depends on package form factor requirements and assembly methodology.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT543ADBR directly replace 74ABT543CMSA in existing designs? A: Yes. SN74ABT543ADBR is electrically and mechanically identical to 74ABT543CMSA, with matching 24-SSOP package dimensions, supply voltage range (4.5V ~ 5.5V), output current specifications (32mA, 64mA), and operating temperature range (-40°C ~ 85°C).

Q: What is the difference between SN74ABT543APW and SN74ABT543APWR? A: Both parts are electrically identical. The primary difference is packaging format: SN74ABT543APW is supplied in Tube format, while SN74ABT543APWR is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements.

Q: Can I use the 24-TSSOP variants (SN74ABT543APW, SN74ABT543APWR) as substitutes if my PCB is designed for 24-SSOP? A: No. While both packages are surface mount, they have different physical dimensions. The 24-TSSOP package (0.173" width, 4.40mm) is narrower than the 24-SSOP package (0.209" width, 5.30mm). PCB footprint redesign is required for package migration.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All Texas Instruments substitutes (SN74ABT543ADBR, SN74ABT543APW, SN74ABT543APWR) are ROHS3 compliant. The original 74ABT543CMSA does not specify RoHS status.

Q: What is the moisture sensitivity level for these parts? A: All parts, including the original 74ABT543CMSA and all substitutes, have Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements.

Q: Are these parts subject to export restrictions? A: All parts carry ECCN classification EAR99 and REACH Unaffected status, indicating standard commercial export classification.

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