MM74HCT573SJ Equivalent & Substitute Parts

Part Overview

The MM74HCT573SJ 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 housed in a 20-SOP package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

MM74HCT573SJ

onsemiIn Stock: 1088MM74HCT573SJ Datasheet

Current PartRFQ

MC74HCT573ADWG

onsemiIn Stock: 2198MC74HCT573ADWG Datasheet

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MC74HCT573ADWR2G

onsemiIn Stock: 2170MC74HCT573ADWR2G Datasheet

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CD74HCT573M

Harris CorporationIn Stock: 1674CD74HCT573M Datasheet

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CD74HCT573M96

Texas InstrumentsIn Stock: 3251CD74HCT573M96 Datasheet

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SN74HCT573DW

Texas InstrumentsIn Stock: 4088SN74HCT573DW Datasheet

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SN74HCT573DWR

Texas InstrumentsIn Stock: 2122SN74HCT573DWR Datasheet

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SN74HCT573NSR

Texas InstrumentsIn Stock: 10285SN74HCT573NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM74HCT573SJ is determined by strict equivalence across the following critical parameters:

• Logic Type & Circuit Configuration: All substitutes must be D-Type Transparent Latch with 8:8 circuit configuration
• Output Type: Tri-state output capability is mandatory
• Supply Voltage Range: 4.5V ~ 5.5V compatibility is required
• Independent Circuits: Single channel (1) configuration
• Mounting Type: Surface mount only
• Base Product Number: 74HCT573 series

Substitute parts are grouped by package type and product status. Package variations (20-SOIC vs. 20-SOP) are acceptable substitutes provided all electrical parameters remain within specification. Active product status substitutes are preferred over obsolete or discontinued alternatives for long-term availability.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Status)

SN74HCT573DWR and SN74HCT573NSR are the preferred substitutes. Both are manufactured by Texas Instruments with active product status, ensuring long-term availability and supply chain stability. SN74HCT573NSR matches the original 20-SO package footprint (0.209", 5.30mm width), providing direct mechanical compatibility. SN74HCT573DWR uses a wider 20-SOIC package (0.295", 7.50mm width) but maintains electrical equivalence. Both parts feature 25ns propagation delay and ROHS3 compliance with MSL 1 rating.

Secondary Substitutes (Active Status)

MC74HCT573ADWG and MC74HCT573ADWR2G, both from onsemi, are active alternatives. These parts feature extended operating temperature range (-55°C ~ 125°C) compared to the original specification (-40°C ~ 85°C). Propagation delay is 30ns, which is acceptable for most applications. Both carry ROHS3 compliance and MSL 3 rating (168 hours).

Alternative Substitute (Active Status)

CD74HCT573M96 from Texas Instruments is active with extended temperature range (-55°C ~ 125°C) and 35ns propagation delay. This part provides the widest operating temperature specification among all substitutes and carries ROHS3 compliance with MSL 1 rating.

Avoid

CD74HCT573M (Harris Corporation) is obsolete and RoHS non-compliant. SN74HCT573DW is discontinued at DiGi Electronics. The original MM74HCT573SJ is obsolete.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HCT573NSR as a direct replacement for MM74HCT573SJ?

A: Yes. SN74HCT573NSR is electrically equivalent and uses the same 20-SO package footprint (0.209", 5.30mm width). Both parts operate at 4.5V ~ 5.5V supply voltage, feature tri-state output, and support 8:8 circuit configuration. SN74HCT573NSR has 25ns propagation delay versus 17ns for the original, which is acceptable for standard logic applications. The part is active with ROHS3 compliance and unlimited moisture sensitivity rating.

Q: What is the difference between 20-SOIC and 20-SO packages?

A: The 20-SO package (0.209", 5.30mm width) is narrower than the 20-SOIC package (0.295", 7.50mm width). Both are surface-mount packages with 20 pins. If your PCB layout accommodates the original 20-SO footprint, use SN74HCT573NSR. If your design uses 20-SOIC footprint, use SN74HCT573DWR or MC74HCT573ADWR2G.

Q: Are there temperature range differences between substitutes?

A: Yes. The original MM74HCT573SJ operates from -40°C ~ 85°C. Substitutes MC74HCT573ADWG, MC74HCT573ADWR2G, CD74HCT573M, and CD74HCT573M96 extend this to -55°C ~ 125°C. SN74HCT573DW, SN74HCT573DWR, and SN74HCT573NSR maintain the -40°C ~ 85°C range. Select based on your application's thermal requirements.

Q: What is the propagation delay difference, and does it matter?

A: The original MM74HCT573SJ has 17ns propagation delay. Substitutes range from 25ns (Texas Instruments SN series) to 35ns (CD74HCT573M96). For most standard logic applications, these differences are negligible. If your design has tight timing constraints, verify that the substitute's delay specification meets your system requirements.

Q: Which substitute has the best compliance status?

A: All active substitutes carry ROHS3 compliance. SN74HCT573DWR, SN74HCT573NSR, and CD74HCT573M96 have MSL 1 (unlimited moisture sensitivity), matching the original part. MC74HCT573ADWG and MC74HCT573ADWR2G have MSL 3 (168 hours), which requires controlled storage conditions.

Q: Can I use multiple substitutes interchangeably in the same design?

A: All listed active substitutes are electrically compatible and can be used interchangeably provided your PCB layout accommodates the package type. However, for production consistency, select a single substitute and maintain it throughout the product lifecycle.