74ACTQ373QSCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ373QSCX is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 channel configuration with tri-state output capability. This component operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-QSOP surface mount package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

74ACTQ373QSCX

onsemiIn Stock: 118574ACTQ373QSCX Datasheet

Current PartRFQ

SN74ACT373DBR

Texas InstrumentsIn Stock: 3121SN74ACT373DBR Datasheet

SimilarRFQ

SN74ACT373PW

Texas InstrumentsIn Stock: 1562SN74ACT373PW Datasheet

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SN74ACT373PWR

Texas InstrumentsIn Stock: 3359SN74ACT373PWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACTQ373QSCX is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Voltage - Supply: 4.5V ~ 5.5V
• Independent Circuits: 1
• Current - Output High, Low: 24mA, 24mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount

Allowable Variations:

• Propagation Delay Time: Substitute parts may have different delay specifications (8.5ns is acceptable as it remains within functional tolerance for latch applications)
• Package / Case: Different surface mount packages are acceptable provided they maintain electrical compatibility and pin configuration equivalence
• Manufacturer: Alternative manufacturers producing functionally identical 74ACT373 series components are acceptable

The three identified substitute parts—SN74ACT373DBR, SN74ACT373PW, and SN74ACT373PWR—all meet these substitution criteria through their shared base product number (74ACT373) and identical electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

SN74ACT373PWR (Texas Instruments) - Recommended Primary Substitute

This part is the optimal substitute based on active product status and ROHS3 compliance. The 20-TSSOP package (0.173", 4.40mm Width) provides a compact form factor suitable for modern PCB layouts. Texas Instruments maintains active production and distribution channels for this component, ensuring long-term availability and supply chain stability.

SN74ACT373DBR (Texas Instruments) - Secondary Substitute

This part maintains active status and ROHS3 compliance. The 20-SSOP package (0.209", 5.30mm Width) is slightly wider than the original 20-QSOP package but remains compatible for applications with adequate PCB real estate. This option provides an alternative packaging choice when 20-TSSOP availability is constrained.

SN74ACT373PW (Texas Instruments) - Tertiary Substitute

This part is discontinued at DiGi Electronics but remains available through alternative distribution channels. The 20-TSSOP package matches SN74ACT373PWR specifications. Selection of this part should be limited to applications where SN74ACT373PWR is unavailable and existing inventory is confirmed through secondary sources.

All three substitutes share identical electrical specifications with the original part and maintain compliance certifications required for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT373DBR, SN74ACT373PW, and SN74ACT373PWR be used interchangeably with 74ACTQ373QSCX?

A: Yes, all three parts are functionally equivalent substitutes. They share identical logic type, circuit configuration, output type, supply voltage range, output current specifications, and operating temperature range. The primary differences are package form factors and product status. Pin configuration equivalence must be verified against the specific PCB layout requirements.

Q: What is the significance of the different package types (20-QSOP, 20-SSOP, 20-TSSOP)?

A: These designations indicate different surface mount package dimensions. The 20-QSOP (0.154", 3.90mm width) is the original package. The 20-SSOP (0.209", 5.30mm width) and 20-TSSOP (0.173", 4.40mm width) are alternative packages with different body widths. PCB footprint compatibility must be confirmed before substitution. The 20-TSSOP is narrower than the original 20-QSOP, while the 20-SSOP is wider.

Q: Why does the 74ACTQ373QSCX have a lower propagation delay (6.5ns) compared to the substitute parts (8.5ns)?

A: Propagation delay variations between manufacturers and product lines are normal within the 74ACT373 family. The 8.5ns specification for Texas Instruments parts remains within acceptable tolerance for D-Type Transparent Latch applications. System timing analysis should confirm that the increased delay does not impact circuit performance.

Q: What is the difference between "Active" and "Obsolete" product status?

A: Active status indicates the manufacturer continues production and supports the component through standard distribution channels. Obsolete status indicates the manufacturer has discontinued production. The substitute parts with Active status (SN74ACT373PWR and SN74ACT373DBR) provide assured long-term availability compared to the obsolete original part.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all three substitute parts carry ROHS3 compliance certification. The original 74ACTQ373QSCX does not specify RoHS status in the provided data. ROHS3 compliance is required for applications subject to European Union environmental regulations.

Q: Which substitute part should be selected for new designs?

A: SN74ACT373PWR is the recommended choice for new designs based on active product status, ROHS3 compliance, and established Texas Instruments supply chain support. The 20-TSSOP package provides a compact form factor suitable for modern PCB density requirements.