CD74HCT573M Equivalent & Substitute Parts

Part Overview

The CD74HCT573M is a D-Type Transparent Latch logic IC manufactured by Texas Instruments, featuring an 8:8 circuit configuration with tri-state output in a 20-SOIC surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 74HCT573 series provides a standardized logic function across multiple manufacturers, enabling direct substitution based on electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Supply Voltage Range	4.5V ~ 5.5V
Independent Circuits	1
Propagation Delay	35ns
Output Current (High/Low)	6mA / 6mA
Operating Temperature Range	-55°C ~ 125°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD74HCT573M is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Supply Voltage: 4.5V ~ 5.5V
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Substitutes maintain identical electrical specifications and packaging. These parts are pin-compatible and functionally equivalent with no design modifications required.

Manufacturer Recommended Substitutes are actively supported alternatives from the original manufacturer or authorized sources. These parts meet all critical parameters and are recommended for new designs and production.

Parametric Equivalents share the same logic function and package but may originate from different manufacturers or product lines (74HCT373 vs. 74HCT573 base numbers). These require verification of pin compatibility and functional equivalence in the specific application circuit.

Parameter Comparison

Part Number	Manufacturer	Base Product	Propagation Delay (ns)	Output Current (mA)	Temp Range (°C)	Product Status	Packaging
CD74HCT573M	Texas Instruments	74HCT573	35	6 / 6	-55 ~ 125	Discontinued	Tube
CD74HCT573M96	Texas Instruments	74HCT573	35	6 / 6	-55 ~ 125	Active	Tape & Reel
74HCT573D,653	Nexperia USA Inc.	74HCT573	17	6 / 6	-40 ~ 125	Active	Cut Tape & Digi-Reel
74HCT573D-Q100,118	Nexperia USA Inc.	74HCT573	17	6 / 6	-40 ~ 125	Active	Tape & Reel
MC74HCT573ADWR2G	onsemi	74HCT573	30	6 / 6	-55 ~ 125	Active	Tape & Reel
MC74HCT573ADWG	onsemi	74HCT573	30	6 / 6	-55 ~ 125	Active	Tube
MM74HCT573WM	Fairchild Semiconductor	74HCT573	17	7.2 / 7.2	-40 ~ 85	Active	Bulk
MM74HCT573WMX	Fairchild Semiconductor	74HCT573	17	7.2 / 7.2	-40 ~ 85	Active	Not Specified
CD74HCT373M	Harris Corporation	74HCT373	35	6 / 6	-55 ~ 125	Obsolete	Tube
CD74HCT373MG4	Texas Instruments	74HCT373	35	6 / 6	-55 ~ 125	Discontinued	Not Specified
MC74HCT373ADWG	onsemi	74HCT373	28	6 / 6	-55 ~ 125	Active	Tube

Engineering Selection Recommendations

For Active Production and New Designs:

CD74HCT573M96 is the primary direct substitute, maintaining identical electrical specifications while offering active product status and improved availability in Tape & Reel packaging. This part is manufactured by Texas Instruments and carries ROHS3 compliance with unlimited moisture sensitivity rating.

74HCT573D,653 and 74HCT573D-Q100,118 from Nexperia USA Inc. are manufacturer-recommended alternatives with active status. Both parts feature improved propagation delay (17ns vs. 35ns) and extended temperature support to -40°C. The automotive-qualified variant (74HCT573D-Q100,118) with AEC-Q100 certification is suitable for automotive applications.

MC74HCT573ADWR2G and MC74HCT573ADWG from onsemi provide active alternatives with propagation delay of 30ns, maintaining the full -55°C to 125°C temperature range. Both carry ROHS3 compliance.

For Extended Temperature Range Applications:

Parts maintaining the -55°C to 125°C operating range include CD74HCT573M96, MC74HCT573ADWR2G, MC74HCT573ADWG, and parametric equivalents CD74HCT373M and CD74HCT373MG4. Applications requiring temperatures below -40°C must use these variants.

For Automotive Applications:

74HCT573D-Q100,118 is the only part with AEC-Q100 automotive qualification and is recommended for automotive-grade designs.

Parametric Equivalents (74HCT373 Base):

CD74HCT373M, CD74HCT373MG4, and MC74HCT373ADWG are parametric equivalents based on the 74HCT373 product line. These parts share identical electrical specifications and 20-SOIC packaging but differ in base product designation. Substitution requires verification of pin compatibility and functional equivalence in the specific application circuit, as 74HCT373 and 74HCT573 may have different pin assignments.

Frequently Asked Questions (FAQ)

Q: Can I directly replace CD74HCT573M with CD74HCT573M96?

A: Yes. CD74HCT573M96 is a direct substitute with identical electrical specifications, supply voltage range, operating temperature, and 20-SOIC package. The only difference is packaging format (Tape & Reel vs. Tube) and active product status.

Q: What is the difference between 74HCT573 and 74HCT373 parts?

A: Both are D-Type Transparent Latch ICs with 8:8 configuration in 20-SOIC packages and identical electrical specifications. The primary difference is the base product designation. Pin compatibility must be verified in the application circuit before substitution, as these product lines may have different pin assignments despite similar functional descriptions.

Q: Are Fairchild MM74HCT573WM and MM74HCT573WMX suitable replacements?

A: These parts are functionally compatible but have operational constraints. They feature improved propagation delay (17ns) and higher output current (7.2mA) but operate only to -40°C minimum and 85°C maximum, compared to the CD74HCT573M range of -55°C to 125°C. Use only if your application operates within -40°C to 85°C.

Q: Which substitute part has the fastest propagation delay?

A: Nexperia 74HCT573D,653 and 74HCT573D-Q100,118 offer the fastest propagation delay at 17ns, compared to 35ns for the original CD74HCT573M. onsemi MC74HCT573ADWR2G and MC74HCT573ADWG provide 30ns delay.

Q: Is the CD74HCT573M RoHS compliant?

A: Yes, CD74HCT573M is ROHS3 compliant. All active substitute parts listed (CD74HCT573M96, 74HCT573D,653, 74HCT573D-Q100,118, MC74HCT573ADWR2G, MC74HCT573ADWG) are also ROHS3 compliant.

Q: What is the moisture sensitivity level difference between parts?

A: CD74HCT573M and CD74HCT573M96 have MSL 1 (Unlimited), meaning no moisture sensitivity restrictions. MC74HCT573ADWR2G, MC74HCT573ADWG, and MC74HCT373ADWG have MSL 3 (168 Hours), requiring controlled storage and handling within 168 hours of package opening.

Q: Can I use parametric equivalents in existing designs without circuit modification?

A: Parametric equivalents (74HCT373 variants) share electrical specifications and packaging but may have different pin assignments. Verify pin compatibility against your schematic and PCB layout before substitution. Direct substitutes (74HCT573 variants) require no circuit modification.

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