74ACT373SCX D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACT373SCX is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output in a 20-SOIC package. This part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 74ACT373 series provides a standardized logic function across multiple manufacturers and packaging options, enabling direct functional replacement where electrical and mechanical parameters align.

Substiute Parts

74ACT373SCX

onsemiIn Stock: 1718474ACT373SCX Datasheet

Current PartRFQ

MC74ACT373DWG

onsemiIn Stock: 1404MC74ACT373DWG Datasheet

SimilarRFQ

MC74ACT373DWR2G

onsemiIn Stock: 3755MC74ACT373DWR2G Datasheet

SimilarRFQ

SN74ACT373DW

Texas InstrumentsIn Stock: 1749SN74ACT373DW Datasheet

DirectRFQ

SN74ACT373DWR

Texas InstrumentsIn Stock: 5468SN74ACT373DWR Datasheet

DirectRFQ

SN74ACT373MDWREP

Texas InstrumentsIn Stock: 793SN74ACT373MDWREP Datasheet

UpgradeRFQ

CD74ACT373M96

Texas InstrumentsIn Stock: 3009CD74ACT373M96 Datasheet

SimilarRFQ

SN74ACT373NSR

Texas InstrumentsIn Stock: 2171SN74ACT373NSR Datasheet

SimilarRFQ

SN74ACT563DWR

Texas InstrumentsIn Stock: 3766SN74ACT563DWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT373SCX is determined by strict alignment of the following critical parameters:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Supply Voltage: 4.5V ~ 5.5V
• Package Type: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount
• Output Current Capability: 24mA / 24mA

Substitute parts are grouped into the following categories:

Direct Equivalents (onsemi): MC74ACT373DWG and MC74ACT373DWR2G maintain identical electrical specifications and package dimensions. These parts are active products with RoHS3 compliance and differ only in packaging format (Tube vs. Tape & Reel).

Direct Equivalents (Texas Instruments): SN74ACT373DW and SN74ACT373DWR provide identical functional and electrical parameters with the same 20-SOIC package. SN74ACT373DW is discontinued at DiGi Electronics; SN74ACT373DWR remains active.

Upgrade Option: SN74ACT373MDWREP extends the operating temperature range to -55°C ~ 125°C while maintaining all other electrical and mechanical specifications, suitable for applications requiring extended temperature performance.

Package Variant: SN74ACT373NSR uses a narrower 20-SO package (0.209", 5.30mm Width) instead of the standard 20-SOIC, requiring PCB layout verification before substitution.

Parametric Equivalent: SN74ACT563DWR uses the 74ACT563 base product number with identical electrical performance and package specifications. This part functions as a direct substitute despite the different base series designation.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

MC74ACT373DWR2G and SN74ACT373DWR are the preferred substitutes. Both are active products with RoHS3 compliance, identical electrical specifications, and the same 20-SOIC package footprint. MC74ACT373DWR2G offers onsemi sourcing continuity, while SN74ACT373DWR provides Texas Instruments availability. Propagation delay increases marginally from 8ns to 8.5ns, which is acceptable for most applications within the 74ACT373 functional specification.

Extended Temperature Option:

SN74ACT373MDWREP and CD74ACT373M96 extend the operating temperature range to -55°C ~ 125°C. CD74ACT373M96 additionally provides faster propagation delay (3ns vs. 8.5ns), suitable for timing-critical applications. Select these parts only when extended temperature performance is a design requirement.

Package Variant Consideration:

SN74ACT373NSR uses a narrower 20-SO package (0.209" width vs. 0.295" standard). This part is functionally equivalent but requires PCB layout verification to confirm footprint compatibility before implementation.

Parametric Equivalent:

SN74ACT563DWR functions as a direct substitute with identical package and electrical performance. The different base product number (74ACT563 vs. 74ACT373) reflects internal latch architecture differences that do not affect functional compatibility in standard applications.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT373DWG replace 74ACT373SCX directly?

A: Yes. MC74ACT373DWG is functionally equivalent with identical electrical specifications and 20-SOIC package. The 0.5ns increase in propagation delay (8.5ns vs. 8ns) is within standard logic IC tolerances. Moisture sensitivity level increases from 1 to 3, requiring standard handling procedures for storage and assembly.

Q: What is the difference between MC74ACT373DWG and MC74ACT373DWR2G?

A: Both parts are electrically identical. The difference is packaging format: MC74ACT373DWG is supplied in Tube packaging, while MC74ACT373DWR2G is supplied in Tape & Reel (TR) format. Select based on assembly process requirements and volume.

Q: Is SN74ACT373NSR compatible with the original 74ACT373SCX footprint?

A: SN74ACT373NSR uses a narrower 20-SO package (0.209" width) compared to the standard 20-SOIC (0.295" width). Pin count and spacing are identical, but PCB pad layout must be verified for compatibility. This part is suitable only if your PCB design accommodates the narrower package width.

Q: When should I use SN74ACT373MDWREP instead of standard substitutes?

A: Select SN74ACT373MDWREP when your application requires extended operating temperature range (-55°C ~ 125°C). Standard substitutes operate only to -40°C ~ 85°C. All other electrical and mechanical specifications remain identical.

Q: What is the functional difference between SN74ACT563DWR and 74ACT373SCX?

A: Both parts implement D-Type Transparent Latch logic with identical 8:8 circuit configuration, tri-state output, and 20-SOIC package. The 74ACT563 base product number indicates a different internal latch design, but electrical performance and pin compatibility are equivalent for standard applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed carry RoHS3 compliance certification. The original 74ACT373SCX does not specify RoHS status due to its obsolete status.

Q: Which substitute offers the fastest propagation delay?

A: CD74ACT373M96 provides the fastest propagation delay at 3ns, compared to 8ns for the original part. This part also extends operating temperature to -55°C ~ 125°C. Select this part only if timing performance is a critical design parameter.