MM74HCT573WM Equivalent & Substitute Parts

Part Overview

The MM74HCT573WM is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability in a 20-SOIC package. This component operates within the 4.5V to 5.5V supply voltage range and is designed for digital logic applications requiring transparent latch functionality.

The MM74HCT573WM is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this logic function.

Substiute Parts

MM74HCT573WM

onsemiIn Stock: 1057MM74HCT573WM 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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SN74HCT573DW

Texas InstrumentsIn Stock: 4088SN74HCT573DW Datasheet

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74HCT573D,653

Nexperia USA Inc.In Stock: 424874HCT573D,653 Datasheet

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CD74HCT573M96

Texas InstrumentsIn Stock: 3251CD74HCT573M96 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 MM74HCT573WM 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
• Voltage - Supply: 4.5V ~ 5.5V
• Independent Circuits: 1
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

Allowable Variation Parameters:

• Delay Time - Propagation: 17ns to 35ns (within acceptable timing margins for latch applications)
• Current - Output High, Low: 6mA to 7.2mA (within tri-state output specifications)
• Operating Temperature: -40°C to -55°C minimum; 85°C to 125°C maximum (extended or standard ranges acceptable)
• Product Status: Active or Obsolete (both acceptable for substitution purposes)
• RoHS Status: ROHS3 Compliant or RoHS non-compliant (compliance status does not prevent substitution)
• Moisture Sensitivity Level (MSL): 1 to 3 (standard handling levels)

Substitute parts must maintain identical base product number (74HCT573) and package footprint compatibility to ensure direct PCB placement without redesign.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

The 74HCT573D,653 from Nexperia USA Inc. is the preferred substitute. It maintains identical propagation delay (17ns) to the MM74HCT573WM, operates across an extended temperature range (-40°C ~ 125°C), carries ROHS3 compliance, and holds active product status with established supply availability.

The SN74HCT573DWR and SN74HCT573NSR from Texas Instruments are direct functional equivalents with 25ns propagation delay and active status. Both are ROHS3 compliant and suitable for applications where the slightly increased propagation delay is acceptable within system timing requirements.

Secondary Substitutes (Extended Temperature Range):

The MC74HCT573ADWG and MC74HCT573ADWR2G from onsemi provide extended operating temperature range (-55°C ~ 125°C) with active product status and ROHS3 compliance. These parts accommodate 30ns propagation delay and are appropriate for applications requiring wider temperature operation.

The CD74HCT573M96 from Texas Instruments offers extended temperature range (-55°C ~ 125°C) and active status with ROHS3 compliance, though propagation delay extends to 35ns.

Obsolete Alternatives:

The CD74HCT573M from Harris Corporation is obsolete and RoHS non-compliant. Selection of this part is not recommended for new designs or ongoing production.

Frequently Asked Questions (FAQ)

Q: Can the MM74HCT573WM be directly replaced with any of the listed substitutes?

A: Yes. All listed substitute parts maintain the same base product number (74HCT573), logic function (D-Type Transparent Latch), circuit configuration (8:8), output type (tri-state), supply voltage range (4.5V ~ 5.5V), and 20-SOIC package footprint. Direct PCB placement is possible without circuit redesign.

Q: What is the significance of propagation delay differences between the main part and substitutes?

A: The MM74HCT573WM specifies 17ns propagation delay. Substitute parts range from 17ns to 35ns. Propagation delay affects the maximum frequency at which the latch can operate reliably. Applications with strict timing requirements must verify that substitute propagation delays remain within system timing margins. Substitutes with equal or lower propagation delay (17ns, 25ns) present no timing degradation. Substitutes with higher propagation delay (30ns, 35ns) require timing verification.

Q: Are there package compatibility concerns between the main part and substitutes?

A: All substitute parts use the 20-SOIC package with 0.295" (7.50mm) width, matching the MM74HCT573WM footprint. The SN74HCT573NSR uses a 20-SO package with 0.209" (5.30mm) width, which is mechanically compatible but represents a narrower package variant. PCB layout verification is recommended for this variant to confirm clearance and placement compatibility.

Q: What is the difference between packaging options (Tube, Tape & Reel, Cut Tape)?

A: Packaging affects handling, storage, and automated assembly processes. Tube packaging is suitable for manual assembly and small-volume applications. Tape & Reel (TR) packaging is optimized for high-volume automated pick-and-place assembly. Cut Tape (CT) & Digi-Reel® packaging provides intermediate volume flexibility. Electrical and functional performance is identical across all packaging options for the same part number variant.

Q: Should I prioritize active or obsolete product status when selecting a substitute?

A: Active product status indicates ongoing manufacturer support, established supply chains, and long-term availability. For new designs and ongoing production, active status substitutes are strongly preferred. Obsolete parts may have limited remaining inventory and no future supply guarantees.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. ROHS3 compliant parts are suitable for applications subject to environmental and regulatory compliance requirements. The CD74HCT573M is RoHS non-compliant and may not be acceptable for regulated applications.

Q: Can I use a substitute with a different operating temperature range?

A: Yes, provided the substitute's operating temperature range encompasses your application's requirements. The MM74HCT573WM operates -40°C ~ 85°C. Substitutes with extended ranges (-55°C ~ 125°C) are fully compatible and provide additional thermal margin. Substitutes with identical or narrower ranges are also acceptable if your application operates within those limits.