74ACTQ373SC D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACTQ373SC 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 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC surface mount package.

Substiute Parts

74ACTQ373SC

onsemiIn Stock: 177374ACTQ373SC Datasheet

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MC74ACT373DWG

onsemiIn Stock: 1404MC74ACT373DWG Datasheet

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MC74ACT373DWR2G

onsemiIn Stock: 3755MC74ACT373DWR2G Datasheet

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CD74ACT373M96

Texas InstrumentsIn Stock: 3009CD74ACT373M96 Datasheet

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SN74ACT373DW

Texas InstrumentsIn Stock: 1749SN74ACT373DW Datasheet

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SN74ACT373DWR

Texas InstrumentsIn Stock: 5468SN74ACT373DWR Datasheet

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SN74ACT373MDWREP

Texas InstrumentsIn Stock: 793SN74ACT373MDWREP Datasheet

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SN74ACT373NSR

Texas InstrumentsIn Stock: 2171SN74ACT373NSR Datasheet

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SN74ACT563DW

Texas InstrumentsIn Stock: 1647SN74ACT563DW Datasheet

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SN74ACT573DW

Texas InstrumentsIn Stock: 2818SN74ACT573DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACTQ373SC is determined by strict equivalence across the following critical parameters:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Supply Voltage Range: 4.5V ~ 5.5V
• Independent Circuits: 1
• Current Output Capability: 24mA (High and Low)
• Package Type: 20-SOIC surface mount
• Mounting Type: Surface Mount

Substitute parts are categorized into two groups:

Direct Substitutes (74ACT373 Base Series): Parts sharing identical base product numbers with matching electrical and mechanical specifications. These include onsemi MC74ACT373DWG, MC74ACT373DWR2G, and Texas Instruments SN74ACT373DW, SN74ACT373DWR, SN74ACT373MDWREP, and CD74ACT373M96. All maintain the 8:8 circuit configuration, tri-state output, and 20-SOIC package footprint.

Parametric Equivalents (74ACT563/573 Series): Parts with different base product numbers (SN74ACT563DW, SN74ACT573DW) that maintain functional equivalence through identical logic type, circuit configuration, output type, supply voltage, and package specifications. These represent alternative logic families within the 74ACT series.

Package Variant: SN74ACT373NSR uses a 20-SO package (0.209", 5.30mm Width) instead of the standard 20-SOIC, representing a mechanical variant with the same electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

For Active Production: SN74ACT373DWR and SN74ACT373MDWREP are recommended as primary substitutes. Both are active status parts from Texas Instruments with ROHS3 compliance. SN74ACT373MDWREP offers extended operating temperature range (-55°C ~ 125°C) compared to the original specification, providing additional thermal margin for demanding applications.

For Extended Temperature Requirements: CD74ACT373M96 and SN74ACT373MDWREP both support -55°C ~ 125°C operating range. CD74ACT373M96 provides superior propagation delay performance (3ns) while maintaining MSL 1 rating identical to the original part.

For onsemi Continuity: MC74ACT373DWR2G maintains onsemi manufacturer continuity with active product status and ROHS3 compliance. The tape and reel packaging supports high-volume production requirements.

For Package Compatibility: All recommended substitutes maintain the 20-SOIC (0.295", 7.50mm Width) package footprint except SN74ACT373NSR, which uses a narrower 20-SO package (0.209", 5.30mm Width). PCB layout verification is required if selecting the SN74ACT373NSR variant.

Avoid: Parts with discontinued or last-time-buy status (SN74ACT373DW, SN74ACT573DW, SN74ACT563DW) should not be selected for new designs due to supply discontinuation.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74ACTQ373SC with any of the listed substitutes?

A: Yes, all listed substitutes maintain identical logic type (D-Type Transparent Latch), circuit configuration (8:8), output type (tri-state), supply voltage (4.5V ~ 5.5V), output current (24mA), and 20-SOIC package footprint. Electrical and mechanical compatibility is confirmed across all direct substitutes.

Q: What is the difference between direct substitutes and parametric equivalents?

A: Direct substitutes (MC74ACT373DWG, MC74ACT373DWR2G, SN74ACT373DW, SN74ACT373DWR, SN74ACT373MDWREP, CD74ACT373M96) share the 74ACT373 base product number. Parametric equivalents (SN74ACT563DW, SN74ACT573DW) use different base numbers but maintain functional equivalence through identical electrical specifications and package type. Both categories are electrically interchangeable.

Q: Does propagation delay variation affect substitution compatibility?

A: Propagation delay differences (ranging from 3ns to 8.5ns) do not prevent substitution. All parts meet the tri-state latch functional requirement. However, timing-critical applications should verify that the selected substitute's propagation delay meets circuit timing constraints. CD74ACT373M96 (3ns) and SN74ACT573DW (6ns) offer faster performance than the original 6.5ns specification.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: The original 74ACTQ373SC carries MSL 1 (unlimited shelf life). Most substitutes maintain MSL 1, except MC74ACT373DWG and MC74ACT373DWR2G (MSL 3, 168 hours). MSL 3 parts require controlled storage and handling within 168 hours of package opening. For applications with extended storage requirements, select MSL 1 rated parts.

Q: Can I use SN74ACT373NSR as a direct replacement?

A: SN74ACT373NSR is electrically equivalent but uses a 20-SO package (0.209", 5.30mm Width) instead of the standard 20-SOIC (0.295", 7.50mm Width). PCB footprint compatibility must be verified before selection. The narrower package may not fit existing 20-SOIC land patterns.

Q: Which substitute offers the best thermal performance?

A: CD74ACT373M96 and SN74ACT373MDWREP both support -55°C ~ 125°C operating temperature, compared to the original -40°C ~ 85°C range. Both are suitable for extended temperature applications. CD74ACT373M96 additionally provides the fastest propagation delay (3ns).

Q: Are all substitutes RoHS compliant?

A: Yes. The original 74ACTQ373SC carries REACH Unaffected status. All substitutes are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and procurement.