74HC573DB,112 D-Type Transparent Latch IC Equivalent & Substitute Parts

Part Overview

The 74HC573DB,112 is a D-Type Transparent Latch IC manufactured by Nexperia USA Inc., featuring an 8:8 channel configuration with tri-state output capability. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design requirements and production continuity. The 74HC series logic family provides standardized pin configurations and electrical characteristics across multiple manufacturers, enabling direct functional substitution when electrical and mechanical parameters align.

Substiute Parts

74HC573DB,112

Nexperia USA Inc.In Stock: 112374HC573DB,112 Datasheet

Current PartRFQ

74HC573PW,118

Nexperia USA Inc.In Stock: 99047074HC573PW,118 Datasheet

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MM74HC573MTC

Fairchild SemiconductorIn Stock: 7307MM74HC573MTC Datasheet

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MM74HC573MTCX

onsemiIn Stock: 4083MM74HC573MTCX Datasheet

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SN74HC573ADBR

Texas InstrumentsIn Stock: 2164SN74HC573ADBR Datasheet

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SN74HC573APWR

Texas InstrumentsIn Stock: 53433SN74HC573APWR Datasheet

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SN74HC573APWT

Texas InstrumentsIn Stock: 3182SN74HC573APWT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC573DB,112 is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Logic Type: D-Type Transparent Latch (8:8 configuration)
• Output Type: Tri-State
• Supply Voltage Range: 2V to 6V
• Output Current Capability: 7.8mA minimum (High and Low)
• Independent Circuits: 1 channel

Mechanical Compatibility Requirements:

• Package Type: 20-SSOP or 20-TSSOP (both 20-pin surface mount packages with compatible pinouts)
• Mounting Type: Surface Mount

Operational Compatibility:

• Operating Temperature Range: Minimum -40°C to 85°C (extended range to 125°C preferred but not mandatory)
• Propagation Delay: Up to 23ns acceptable for logic latch applications

Substitute parts are grouped into two categories based on package type: 20-SSOP variants (direct package match) and 20-TSSOP variants (compatible pinout, reduced package width). All substitute parts maintain the 74HC series base product number and share identical functional specifications within acceptable timing tolerances.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

74HC573PW,118 (Nexperia USA Inc.) is the optimal substitute, offering identical electrical specifications to the original 74HC573DB,112 with active product status and full ROHS3 compliance. The 20-TSSOP package provides equivalent functionality with reduced footprint (4.40mm width versus 5.30mm). This part maintains the same propagation delay (14ns) and extended operating temperature range (-40°C to 125°C), ensuring direct functional compatibility.

SN74HC573APWR (Texas Instruments) provides an alternative with active status and ROHS3 compliance. While propagation delay increases to 23ns and operating temperature range reduces to -40°C to 85°C, these parameters remain within acceptable tolerances for standard logic latch applications. The 20-TSSOP package matches 74HC573PW,118.

Secondary Substitutes (Conditional Use):

SN74HC573ADBR (Texas Instruments) maintains the original 20-SSOP package format with active product status and ROHS3 compliance. This option is suitable for designs requiring package compatibility with the original 74HC573DB,112. Propagation delay (23ns) and operating temperature range (-40°C to 85°C) are within acceptable limits.

MM74HC573MTCX (onsemi) offers active status with ROHS3 compliance and MSL Level 1 rating. The 20-TSSOP package and 15ns propagation delay provide good compatibility, though operating temperature range is limited to -40°C to 85°C.

Not Recommended:

SN74HC573APWT (Texas Instruments) is discontinued at DiGi Electronics and should not be selected for new production designs despite active manufacturer status.

MM74HC573MTC (Fairchild Semiconductor) lacks specified RoHS compliance documentation and should be avoided unless legacy design requirements mandate Fairchild sourcing.

Frequently Asked Questions (FAQ)

Q: Can I use a 20-TSSOP package substitute in place of the original 20-SSOP package?

A: Yes. Both 20-SSOP and 20-TSSOP packages maintain identical pinout configurations for the 74HC573 logic latch. The primary difference is package width (5.30mm for SSOP versus 4.40mm for TSSOP). PCB layout modifications may be required to accommodate the narrower TSSOP footprint, but electrical functionality and pin assignments remain unchanged.

Q: What is the significance of the propagation delay difference between 14ns and 23ns?

A: Propagation delay represents the time required for output changes to occur following input transitions. The original 74HC573DB,112 specifies 14ns, while several substitutes (SN74HC573ADBR, SN74HC573APWR, SN74HC573APWT) specify 23ns. For standard logic latch applications operating at typical clock frequencies, this 9ns difference is generally not critical. Applications requiring sub-20ns timing margins should verify compatibility with system timing specifications before substitution.

Q: Why does the operating temperature range vary between -40°C to 125°C and -40°C to 85°C?

A: The original 74HC573DB,112 supports extended temperature operation to 125°C, while most substitutes limit operation to 85°C. This difference reflects manufacturer specifications and testing protocols. For applications operating within standard industrial temperature ranges (-40°C to 85°C), all listed substitutes are compatible. Applications requiring operation above 85°C should prioritize 74HC573PW,118 (Nexperia) to maintain the extended temperature capability.

Q: Are all substitute parts RoHS3 compliant?

A: Five of the six recommended substitutes carry explicit ROHS3 compliance certification: 74HC573PW,118, MM74HC573MTCX, SN74HC573ADBR, SN74HC573APWR, and SN74HC573APWT. MM74HC573MTC (Fairchild) does not specify RoHS compliance status. For applications requiring RoHS compliance documentation, select from the five parts with explicit ROHS3 certification.

Q: What is Moisture Sensitivity Level (MSL) and why does it matter?

A: MSL indicates the maximum time a component can be exposed to ambient moisture before soldering without risk of delamination or internal corrosion. MSL Level 1 (Unlimited) means the component has no moisture sensitivity restrictions and can be stored indefinitely without special desiccant packaging. The original 74HC573DB,112 and most substitutes carry MSL Level 1 rating, eliminating moisture-related handling constraints.

Q: Can I substitute the 74HC573DB,112 with parts from different manufacturers?

A: Yes. The 74HC573 is a standardized logic component across multiple manufacturers (Nexperia, Texas Instruments, onsemi, Fairchild). All listed substitutes maintain identical functional specifications, pin configurations, and electrical characteristics. Cross-manufacturer substitution is standard practice in logic IC applications, provided electrical and package parameters align.

Q: Which substitute should I select for new production designs?

A: 74HC573PW,118 (Nexperia) is the recommended choice for new designs, offering active product status, identical electrical specifications to the original part, extended temperature range, and full ROHS3 compliance. If package compatibility with the original 20-SSOP format is required, select SN74HC573ADBR (Texas Instruments) as the alternative.