74LCX573MSA Equivalent & Substitute Parts

Part Overview

The 74LCX573MSA is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74LCX573 series provides transparent latch functionality suitable for data storage and bus interface applications in digital logic systems.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage Supply Range	2V ~ 3.6V
Propagation Delay	1.5ns
Output Current (High/Low)	24mA / 24mA
Operating Temperature	-40°C ~ 85°C
Package Type	20-SSOP (0.209", 5.30mm Width)
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74LCX573MSA is determined by the following critical parameters:

Functional Equivalence: All substitute parts maintain the same D-Type Transparent Latch logic type with 8:8 circuit configuration and tri-state output capability.

Electrical Compatibility: Substitute parts must support the required voltage supply range and output current specifications. The 74LCX573MSA operates at 2V ~ 3.6V; substitute parts with extended lower voltage limits (1.2V ~ 3.6V or 1.65V ~ 3.6V) are electrically compatible and provide broader application flexibility.

Timing Performance: Propagation delay specifications range from 1ns to 2ns across the substitute family. Parts with equal or faster propagation delay (1ns or 1.5ns) are direct functional replacements.

Package Compatibility: The main part uses 20-SSOP packaging. Substitute parts are available in 20-SSOP, 20-TSSOP, and 20-TVSOP packages. Package selection depends on PCB layout requirements and assembly capabilities.

Product Status: Active status substitute parts ensure long-term availability and supply chain reliability compared to the obsolete main part.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply	Propagation Delay	Operating Temp	Package Type	RoHS Status
74LCX573MSA	onsemi	Obsolete	2V ~ 3.6V	1.5ns	-40°C ~ 85°C	20-SSOP	Not Specified
74LVC573APW,118	Nexperia USA Inc.	Active	1.2V ~ 3.6V	1.5ns	-40°C ~ 125°C	20-TSSOP	ROHS3 Compliant
SN74LVC573ADBR	Texas Instruments	Active	1.65V ~ 3.6V	2ns	-40°C ~ 85°C	20-SSOP	ROHS3 Compliant
SN74LVC573ADGVR	Texas Instruments	Active	1.65V ~ 3.6V	2ns	-40°C ~ 85°C	20-TVSOP	ROHS3 Compliant
SN74LVC573APW	Texas Instruments	Active	1.65V ~ 3.6V	2ns	-40°C ~ 85°C	20-TSSOP	ROHS3 Compliant
SN74LVC573APWR	Texas Instruments	Active	1.65V ~ 3.6V	2ns	-40°C ~ 85°C	20-TSSOP	ROHS3 Compliant
SN74LVC573APWRG4	Texas Instruments	Discontinued at DiGi Electronics	1.65V ~ 3.6V	2ns	-40°C ~ 85°C	20-TSSOP	ROHS3 Compliant
SN74LVC573APWT	Texas Instruments	Active	1.65V ~ 3.6V	2ns	-40°C ~ 85°C	20-TSSOP	ROHS3 Compliant
SN74LVC573AQPWREP	Texas Instruments	Active	2V ~ 3.6V	1ns	-40°C ~ 125°C	20-TSSOP	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute (Same Package): SN74LVC573ADBR is the recommended substitute when 20-SSOP package compatibility is required. This Texas Instruments part maintains identical package dimensions to the 74LCX573MSA, operates within compatible voltage and temperature ranges, and holds active product status with ROHS3 compliance.

Extended Temperature Range: SN74LVC573AQPWREP offers the widest operating temperature range (-40°C ~ 125°C) and fastest propagation delay (1ns), making it suitable for applications requiring enhanced thermal performance. This part is available in 20-TSSOP package and maintains active status.

Voltage Flexibility: 74LVC573APW,118 from Nexperia provides the lowest voltage supply floor (1.2V ~ 3.6V), enabling operation in low-power applications. This part features matching 1.5ns propagation delay and extended temperature range (-40°C ~ 125°C).

Packaging Alternatives: For applications where package footprint can be modified, 20-TSSOP variants (SN74LVC573APW, SN74LVC573APWR, SN74LVC573APWT) offer reduced package width (0.173" vs 0.209") while maintaining electrical compatibility.

Compliance Status: All recommended active substitutes carry ROHS3 compliance certification. Avoid SN74LVC573APWRG4, which is discontinued at DiGi Electronics despite current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can I use SN74LVC573ADBR as a direct replacement for 74LCX573MSA?

A: Yes. Both parts share identical 20-SSOP packaging, equivalent tri-state output current (24mA), and compatible voltage/temperature operating ranges. The SN74LVC573ADBR is active status with ROHS3 compliance, addressing the obsolescence of the original part.

Q: What is the difference between 20-SSOP and 20-TSSOP packages?

A: Both are 20-pin surface mount packages. The 20-SSOP measures 0.209" width (5.30mm), while 20-TSSOP measures 0.173" width (4.40mm). The TSSOP variant offers a smaller footprint suitable for space-constrained PCB layouts. Electrical functionality remains identical.

Q: Why does SN74LVC573AQPWREP have faster propagation delay (1ns vs 1.5ns)?

A: Propagation delay variation reflects different manufacturing processes and design optimization between manufacturers. The 1ns specification of SN74LVC573AQPWREP represents improved timing performance and is fully compatible with applications designed for 1.5ns or slower delays.

Q: Is the extended voltage range (1.2V ~ 3.6V) of 74LVC573APW,118 compatible with my 2V ~ 3.6V design?

A: Yes. Extended lower voltage limits provide backward compatibility. If your design operates at 2V or higher, the 74LVC573APW,118 functions identically to the original 74LCX573MSA specification.

Q: Should I avoid SN74LVC573APWRG4 due to discontinued status?

A: Yes. Although inventory is currently available, discontinued status indicates no future supply commitment. Select from active status alternatives (SN74LVC573APWR, SN74LVC573APWT, or SN74LVC573AQPWREP) for long-term design reliability.

Q: What is Moisture Sensitivity Level (MSL) 1, and does it affect substitution?

A: MSL 1 indicates unlimited shelf life without moisture exposure precautions. All substitute parts maintain MSL 1 rating, ensuring equivalent handling and storage requirements.

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