74VHCT573AMX Equivalent & Substitute Parts

Part Overview

The 74VHCT573AMX 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 operates within the 4.5V to 5.5V supply voltage range and is packaged in a 20-SOIC form factor. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	74VHCT573AMX
Manufacturer	onsemi
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage - Supply	4.5V ~ 5.5V
Delay Time - Propagation	5.1ns
Current - Output High, Low	8mA, 8mA
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74VHCT573AMX are classified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount
Voltage - Supply: 4.5V ~ 5.5V (minimum requirement)
Operating Temperature Range: -40°C minimum and 85°C minimum upper limit

Substitute Categories:

Parametric Equivalents maintain identical electrical and mechanical specifications with active product status. These parts are direct functional replacements with no design modifications required.

Direct Manufacturer Alternatives meet all core functional parameters but may operate across an extended voltage range or offer improved performance characteristics while maintaining compatibility with the original application.

Similar Parts satisfy the core logic function and package requirements but may have minor variations in propagation delay or output current specifications. These parts require verification of timing and drive requirements within the specific application circuit.

Parameter Comparison

Parameter	74VHCT573AMX (Main)	MC74VHCT373ADWRG	MC74VHCT573ADWRG	SN74LV573ATDWR	74AHCT573D,118	74AHCT573D-Q100J	SN74AHCT573DW	SN74AHCT573DWR
Manufacturer	onsemi	onsemi	onsemi	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.	Texas Instruments	Texas Instruments
Logic Type	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch
Circuit Configuration	8:8	8:8	8:8	8:8	8:8	8:8	8:8	8:8
Output Type	Tri-State	Tri-State	Tri-State	Tri-State	Tri-State	Tri-State	Tri-State	Tri-State
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	2V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Delay Time - Propagation	5.1ns	5.1ns	5.1ns	1ns	4.6ns	4.6ns	1ns	1ns
Current - Output High, Low	8mA, 8mA	8mA, 8mA	8mA, 8mA	16mA, 16mA	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Last Time Buy	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Parametric Equivalents - Recommended for Direct Replacement:

MC74VHCT573ADWRG and MC74VHCT373ADWRG from onsemi are parametric equivalents with active product status. Both maintain identical electrical specifications and 20-SOIC packaging. Selection between these two depends on specific latch function requirements within the application. Both are ROHS3 compliant and suitable for standard industrial applications.

Direct Manufacturer Alternative - Extended Voltage Range:

SN74LV573ATDWR from Texas Instruments operates across an extended voltage range (2V to 5.5V) while maintaining the 20-SOIC package and tri-state output configuration. This part offers improved propagation delay (1ns versus 5.1ns) and higher output current capability (16mA versus 8mA). MSL rating of 1 (Unlimited) matches the original part. This option is suitable for applications requiring lower voltage operation or improved timing performance.

Similar Parts - Active Status with Extended Temperature Range:

74AHCT573D,118 and 74AHCT573D-Q100J from Nexperia USA Inc. maintain core functional compatibility with 20-SOIC packaging and tri-state output. Both offer extended operating temperature range (-40°C to 125°C) and improved propagation delay (4.6ns). The 74AHCT573D-Q100J includes AEC-Q100 automotive qualification. These parts are suitable for applications requiring extended temperature operation.

SN74AHCT573DW and SN74AHCT573DWR from Texas Instruments are active and last-time-buy status parts respectively, offering 1ns propagation delay and maintaining 8mA output current specifications. Both are ROHS3 compliant with MSL rating of 1 (Unlimited).

Frequently Asked Questions (FAQ)

Q: Can MC74VHCT573ADWRG directly replace 74VHCT573AMX without circuit modifications?

A: Yes. MC74VHCT573ADWRG maintains identical electrical specifications including voltage supply range (4.5V to 5.5V), propagation delay (5.1ns), output current (8mA), and operating temperature range (-40°C to 85°C). The 20-SOIC package is mechanically compatible. The part is currently in active production status.

Q: What is the difference between MC74VHCT373ADWRG and MC74VHCT573ADWRG?

A: Both parts are parametric equivalents of the 74VHCT573AMX with identical electrical and mechanical specifications. The difference lies in the specific latch function implemented within each IC. Selection depends on whether your application requires the 573 or 373 latch configuration.

Q: Why does SN74LV573ATDWR have different propagation delay and output current specifications?

A: SN74LV573ATDWR operates across an extended voltage range (2V to 5.5V) compared to the original part (4.5V to 5.5V). This extended range capability results in improved propagation delay (1ns versus 5.1ns) and higher output current drive (16mA versus 8mA). These are inherent performance characteristics of the 74LV logic family.

Q: Are the Nexperia 74AHCT573 parts suitable for my application?

A: 74AHCT573D,118 and 74AHCT573D-Q100J maintain the core 8:8 D-Type Transparent Latch function with tri-state output in 20-SOIC packaging. Both offer improved propagation delay (4.6ns) and extended operating temperature range (-40°C to 125°C). The 74AHCT573D-Q100J includes AEC-Q100 automotive qualification. Compatibility depends on whether your application can accommodate the faster propagation delay and extended temperature range.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings?

A: MSL rating indicates moisture sensitivity during storage and handling. The original 74VHCT573AMX has MSL 1 (Unlimited), meaning no moisture precautions are required. MC74VHCT373ADWRG and MC74VHCT573ADWRG have MSL 3 (168 Hours), requiring moisture control during storage and a maximum of 168 hours of floor life after bag opening. Other substitute parts maintain MSL 1 rating.

Q: Can I use SN74AHCT573DW which is listed as Last Time Buy?

A: SN74AHCT573DW is functionally compatible and maintains all core specifications. However, Last Time Buy status indicates limited future availability. For new designs or long-term production requirements, SN74AHCT573DWR (active status) or MC74VHCT573ADWRG (active status) are preferred for supply chain continuity.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the compliance status of the original 74VHCT573AMX.

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