74ACTQ373PC D-Type Transparent Latch IC Equivalent & Substitute Parts

Part Overview

The 74ACTQ373PC is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output in a 20-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The part operates within a 4.5V to 5.5V supply voltage range and is suitable for through-hole mounting applications requiring transparent latch functionality.

Substiute Parts

74ACTQ373PC

onsemiIn Stock: 261374ACTQ373PC Datasheet

Current PartRFQ

CD74ACT373E

Harris CorporationIn Stock: 1477CD74ACT373E Datasheet

SimilarRFQ

SN74ACT373N

Texas InstrumentsIn Stock: 2120SN74ACT373N Datasheet

SimilarRFQ

SN74ACT563N

Texas InstrumentsIn Stock: 1463SN74ACT563N Datasheet

Parametric EquivalentRFQ

SN74ACT573N

Texas InstrumentsIn Stock: 2082SN74ACT573N Datasheet

Parametric EquivalentRFQ

SN74ACT573NE4

Texas InstrumentsIn Stock: 874SN74ACT573NE4 Datasheet

Parametric EquivalentRFQ

TC74ACT573P(F)

Toshiba Semiconductor and StorageIn Stock: 1099TC74ACT573P(F) Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACTQ373PC are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Substitution Criteria:

• 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
• Mounting Type: Through Hole
• Package / Case: 20-DIP (0.300", 7.62mm)

Secondary Compatibility Parameters:

• Delay Time - Propagation: Within acceptable range for system timing requirements
• Operating Temperature: Must support -40°C ~ 85°C minimum

All substitute parts listed maintain identical electrical specifications and mechanical packaging, ensuring direct functional replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74ACT573N (Texas Instruments)

The SN74ACT373N and SN74ACT573N from Texas Instruments are active products with ROHS3 compliance, providing long-term availability and regulatory alignment. Both parts maintain identical electrical and mechanical specifications to the 74ACTQ373PC with propagation delays within acceptable operating parameters (8.5ns and 6ns respectively).

Secondary Recommendation: TC74ACT573P(F) (Toshiba Semiconductor)

The TC74ACT573P(F) is an active product with RoHS compliance and propagation delay of 6.3ns, closely matching the original 74ACTQ373PC specification of 6.5ns. This part offers excellent timing compatibility for applications with strict propagation delay requirements.

Alternative: CD74ACT373E (Harris Corporation)

The CD74ACT373E is classified as obsolete but remains available in inventory. This part features the fastest propagation delay at 3ns and extended operating temperature range (-55°C ~ 125°C), suitable for applications requiring enhanced thermal performance. RoHS non-compliance status should be evaluated against system requirements.

Timing Consideration:

All substitute parts operate within acceptable propagation delay ranges. The SN74ACT563N and SN74ACT573N match the original 6.5ns and 6ns specifications respectively, while the TC74ACT573P(F) at 6.3ns provides near-identical timing performance. The SN74ACT373N at 8.5ns and CD74ACT373E at 3ns represent timing variations that may require system-level evaluation depending on circuit timing margins.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the 74ACTQ373PC with any of these substitute parts?

A: Yes, all listed substitute parts maintain identical electrical specifications (voltage supply, output current, circuit configuration, and package type). Direct pin-for-pin replacement is supported without circuit modification.

Q: What is the difference between the SN74ACT373N and SN74ACT573N?

A: Both parts are functionally equivalent D-Type Transparent Latch ICs with 8:8 configuration and tri-state output. The primary difference is the base product number designation (373 vs. 573), which reflects internal latch architecture variations. Both are active products from Texas Instruments with ROHS3 compliance and identical electrical performance parameters.

Q: Why does the CD74ACT373E have a different propagation delay (3ns vs. 6.5ns)?

A: Propagation delay variations between manufacturers reflect different semiconductor process technologies and design implementations. The CD74ACT373E's faster 3ns delay is within acceptable substitution parameters but may require timing analysis if the original circuit depends on specific delay characteristics.

Q: Are all substitute parts available in the same 20-DIP package?

A: Yes, all substitute parts are packaged in 20-DIP (0.300", 7.62mm) through-hole format, ensuring mechanical compatibility with existing PCB layouts and socket configurations.

Q: Which substitute part should I choose for new designs?

A: For new designs, select from active products: SN74ACT373N, SN74ACT563N, SN74ACT573N (Texas Instruments), or TC74ACT573P(F) (Toshiba). These parts offer long-term availability and current regulatory compliance (ROHS3 or RoHS). The SN74ACT573N and TC74ACT573P(F) provide propagation delays closest to the original 74ACTQ373PC specification.

Q: What is the operating temperature range for these substitute parts?

A: Most substitute parts operate within -40°C ~ 85°C, matching the original 74ACTQ373PC. The CD74ACT373E offers an extended range of -55°C ~ 125°C for applications requiring enhanced thermal performance.

Q: Are these parts RoHS compliant?

A: The SN74ACT373N, SN74ACT563N, SN74ACT573N, and TC74ACT573P(F) are RoHS compliant (ROHS3 or RoHS status). The CD74ACT373E is RoHS non-compliant. Compliance requirements should be evaluated based on system and regulatory specifications.