74LCX573WMX Equivalent & Substitute Parts

Part Overview

The 74LCX573WMX 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, which necessitates identification of active equivalent and substitute parts for ongoing design requirements and procurement planning. The 20-SOIC package format and specified electrical parameters define the scope for compatible alternatives.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LCX573WMX
Manufacturer	onsemi
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 / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 74LCX573WMX is determined by the following critical parameters:

Mandatory Compatibility 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
Output Current: 24mA (High and Low)

Acceptable Parameter Variations:

Voltage Supply Range: Substitute parts must support the 2V ~ 3.6V range of the original part or provide a superset of this range
Propagation Delay: Substitute parts with equal or faster propagation delay (≤1.5ns) are acceptable
Operating Temperature: Substitute parts with equal or extended temperature range are acceptable
Product Status: Active parts are preferred over obsolete alternatives

Substitute parts are grouped into three categories based on their relationship to the 74LCX573WMX:

Direct Manufacturer Substitutes: Parts from onsemi and Texas Instruments that maintain identical functional specifications and package format, differing only in product status, packaging type, or minor temperature range extensions.

Upgrade Alternatives: Active production parts with enhanced specifications or extended operating ranges that provide superior performance characteristics.

Parametric Equivalents: Parts with identical electrical performance but different base product numbers within the same logic family, suitable for applications where the specific variant is not critical.

Parameter Comparison

Parameter	74LCX573WMX	MC74LCX573DWR2G	MC74LCX573DWG	MC74LCX373DWR2G	SN74LVC573ADWR	74LVC573AD,112	74LVC573AD,118	74LVC573AD-Q100J	SN74LVC573ADW
Manufacturer	onsemi	onsemi	onsemi	onsemi	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	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	D-Type Transparent Latch
Circuit Configuration	8:8	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	Tri-State
Voltage Supply Range	2V ~ 3.6V	2V ~ 3.6V	2V ~ 3.6V	2V ~ 3.6V	1.65V ~ 3.6V	1.2V ~ 3.6V	1.2V ~ 3.6V	1.2V ~ 3.6V	1.65V ~ 3.6V
Propagation Delay	1.5ns	1.5ns	1.5ns	1.5ns	2ns	1.5ns	1.5ns	1.5ns	2ns
Output Current (High/Low)	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Obsolete	Active	Active	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: MC74LCX573DWR2G or MC74LCX573DWG

Both onsemi parts maintain the original 74LCX series lineage with active product status. MC74LCX573DWR2G is supplied in Tape & Reel packaging, while MC74LCX573DWG is supplied in Tube packaging. Both offer extended operating temperature range (-55°C ~ 125°C) and ROHS3 compliance. These parts are direct functional equivalents with identical propagation delay and output current specifications.

Secondary Recommendation: SN74LVC573ADWR or SN74LVC573ADW

Texas Instruments 74LVC573 series parts provide active product status with ROHS3 compliance and unlimited moisture sensitivity rating. These parts operate across 1.65V ~ 3.6V supply range and maintain identical output current specifications. Propagation delay is 2ns, which is acceptable for applications where the original 1.5ns specification is not critical. SN74LVC573ADWR is supplied in Cut Tape & Digi-Reel packaging; SN74LVC573ADW is supplied in Tube packaging.

Alternative Consideration: 74LVC573AD,118

Nexperia part 74LVC573AD,118 is active with extended operating temperature range (-40°C ~ 125°C) and unlimited moisture sensitivity. This part supports wider voltage range (1.2V ~ 3.6V) and maintains 1.5ns propagation delay. It is supplied in Cut Tape & Digi-Reel packaging with 4578 units in stock.

Automotive Applications: 74LVC573AD-Q100J

For automotive-grade requirements, Nexperia 74LVC573AD-Q100J provides AEC-Q100 qualification with extended temperature range and unlimited moisture sensitivity. This part is suitable for applications requiring automotive component certification.

Not Recommended: MC74LCX373DWR2G

While this part shares identical electrical specifications, it is a parametric equivalent with different base product number (74LCX373 vs. 74LCX573). Selection should be limited to applications where the specific variant is not functionally critical.

Frequently Asked Questions (FAQ)

Q: Can I use SN74LVC573ADWR as a direct replacement for 74LCX573WMX?

A: Yes. Both parts maintain identical logic type, circuit configuration, output type, package format, and output current specifications. The SN74LVC573ADWR operates across 1.65V ~ 3.6V (which encompasses the original 2V ~ 3.6V range) and has 2ns propagation delay compared to the original 1.5ns. For applications where timing margin exists, this substitution is valid.

Q: What is the difference between MC74LCX573DWR2G and MC74LCX573DWG?

A: Both parts are identical in electrical specifications and product status. The difference is packaging: MC74LCX573DWR2G is supplied in Tape & Reel format for automated assembly, while MC74LCX573DWG is supplied in Tube format for manual handling. Select based on your assembly process requirements.

Q: Why do some substitute parts have different operating temperature ranges?

A: Operating temperature range is a design specification that varies by manufacturer and product line. Parts with extended ranges (such as -55°C ~ 125°C) provide broader environmental capability. The original 74LCX573WMX specifies -40°C ~ 85°C; substitute parts with equal or extended ranges are acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original 74LCX573WMX does not specify RoHS status due to its obsolete classification. For new designs, ROHS3 compliance is standard across all active alternatives.

Q: What does Moisture Sensitivity Level (MSL) mean for component selection?

A: MSL indicates the maximum time a component can be exposed to moisture before soldering. MSL 1 (Unlimited) allows indefinite storage without moisture control. MSL 3 (168 Hours) requires baking before soldering if storage exceeds 168 hours in high-humidity conditions. The original part has MSL 1; some substitutes have MSL 3, which may require additional handling procedures.

Q: Can I use 74LVC573AD,112 as a substitute?

A: 74LVC573AD,112 is functionally compatible but classified as obsolete. While it maintains identical electrical specifications and unlimited moisture sensitivity, active alternatives such as 74LVC573AD,118 are preferred for new procurement to ensure long-term availability.

Q: Is MC74LCX373DWR2G suitable for my application?

A: MC74LCX373DWR2G is a parametric equivalent with identical electrical performance but different base product number (373 vs. 573). Compatibility depends on whether your application requires the specific 573 variant or if the 373 variant is functionally interchangeable. Consult your design documentation to confirm.

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