CD74HC573M D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The CD74HC573M 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 package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

The CD74HC573M operates across a 2V to 6V supply voltage range with a 30ns propagation delay and supports independent tri-state output control. Its discontinuation status necessitates identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage Supply Range	2V ~ 6V
Propagation Delay	30ns
Output Current (High/Low)	7.8mA / 7.8mA
Operating Temperature	-55°C ~ 125°C
Package Type	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the CD74HC573M is determined by strict equivalence across the following critical parameters:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Voltage Supply Range: 2V ~ 6V
Output Current Capability: 7.8mA (High and Low)
Package Type: 20-SOIC mechanical compatibility
Mounting Type: Surface Mount

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents maintain identical electrical specifications and package dimensions, differing only in packaging format (tube, cut tape, or tape & reel) or product status (active vs. discontinued).

Parametric Equivalents satisfy all critical electrical parameters but may have minor variations in propagation delay, operating temperature range, or compliance certifications. These parts are functionally interchangeable within the specified parameter tolerances.

Parameter Comparison

Part Number	Manufacturer	Product Status	Propagation Delay (ns)	Operating Temperature (°C)	Package Format	RoHS Status
CD74HC573M	Texas Instruments	Discontinued	30	-55 ~ 125	Tube	ROHS3 Compliant
CD74HC573M96	Texas Instruments	Active	30	-55 ~ 125	Cut Tape & Digi-Reel	ROHS3 Compliant
MM74HC573WM	onsemi	Active	15	-40 ~ 85	Tube	ROHS3 Compliant
74HC573D,653	Nexperia USA Inc.	Active	14	-40 ~ 125	Cut Tape & Digi-Reel	ROHS3 Compliant
74HC573D-Q100,118	Nexperia USA Inc.	Active	14	-40 ~ 125	Tape & Reel	ROHS3 Compliant
MC74HC573ADWR2G	onsemi	Active	26	-55 ~ 125	Cut Tape & Digi-Reel	ROHS3 Compliant
MM74HC573WMX	onsemi	Active	15	-40 ~ 85	Cut Tape & Digi-Reel	ROHS3 Compliant
MC74HC573ADWG	onsemi	Active	26	-55 ~ 125	Tube	ROHS3 Compliant
CD74HC373M	Harris Corporation	Obsolete	30	-55 ~ 125	Tube	RoHS Non-Compliant

Engineering Selection Recommendations

Primary Recommendation: CD74HC573M96

CD74HC573M96 is the direct equivalent from Texas Instruments with identical electrical specifications and operating range. It maintains active product status and ROHS3 compliance. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tube), which does not affect electrical performance. This part provides the highest compatibility for direct replacement.

Secondary Recommendations: MC74HC573ADWR2G and MC74HC573ADWG

Both onsemi parts (MC74HC573ADWR2G and MC74HC573ADWG) maintain the full -55°C to 125°C operating temperature range matching the original CD74HC573M. Propagation delay is 26ns, slightly faster than the original 30ns specification. Both are ROHS3 compliant and active products. MC74HC573ADWR2G is available in Cut Tape & Digi-Reel format, while MC74HC573ADWG is available in Tube format.

Alternative Options: 74HC573D,653 and 74HC573D-Q100,118

Nexperia parts offer the fastest propagation delay (14ns) and extended temperature support to -40°C minimum. The 74HC573D-Q100,118 variant includes AEC-Q100 automotive qualification. Both are ROHS3 compliant and active. Operating temperature minimum is -40°C rather than -55°C, which may be acceptable depending on application requirements.

Not Recommended: CD74HC373M

The CD74HC373M is obsolete and RoHS non-compliant. While electrically equivalent, its discontinued status and non-compliance with current environmental standards make it unsuitable for new designs or long-term procurement.

Not Recommended: MM74HC573WM and MM74HC573WMX

Both onsemi parts have a reduced operating temperature range (-40°C to 85°C) compared to the original specification (-55°C to 125°C). These are suitable only for applications that do not require the full temperature range of the original part.

Frequently Asked Questions (FAQ)

Q: Can I use CD74HC573M96 as a direct replacement for CD74HC573M?

A: Yes. CD74HC573M96 is electrically identical to CD74HC573M with the same 30ns propagation delay, 2V to 6V supply voltage, and -55°C to 125°C operating range. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tube), which does not affect circuit performance.

Q: What is the difference between the 74HC573D,653 and 74HC573D-Q100,118 variants?

A: Both Nexperia parts are electrically identical with 14ns propagation delay and -40°C to 125°C operating range. The 74HC573D-Q100,118 includes AEC-Q100 automotive qualification and is supplied in Tape & Reel format. The 74HC573D,653 is supplied in Cut Tape & Digi-Reel format without automotive qualification.

Q: Why do some substitute parts have faster propagation delays than the original?

A: Faster propagation delays (14ns to 26ns vs. 30ns) indicate improved performance. These parts meet or exceed the original specification and are fully compatible. Faster propagation does not create compatibility issues in latch circuits.

Q: Can I use MM74HC573WM or MM74HC573WMX if my application operates below -40°C?

A: No. Both onsemi parts have a minimum operating temperature of -40°C. If your application requires operation at -55°C, use CD74HC573M96, MC74HC573ADWR2G, MC74HC573ADWG, or the Nexperia alternatives instead.

Q: Is the 20-SOIC package compatible across all substitute parts?

A: Yes. All substitute parts use the 20-SOIC package with identical 0.295" (7.50mm) width. Mechanical compatibility is maintained across all listed alternatives.

Q: Why is CD74HC373M listed as a substitute if it is obsolete?

A: CD74HC373M is a parametric equivalent with identical electrical specifications but is obsolete and RoHS non-compliant. It should not be used for new designs or procurement. It is listed for reference only when identifying legacy designs.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts except CD74HC373M are ROHS3 compliant. CD74HC373M is RoHS non-compliant and should not be used in applications requiring environmental compliance.

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