74ACTQ573PC D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACTQ573PC 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 identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. The 20-PDIP package format and 4.5V to 5.5V supply voltage range define its operational envelope within standard TTL logic applications.

Substiute Parts

74ACTQ573PC

onsemiIn Stock: 112874ACTQ573PC Datasheet

Current PartRFQ

CD74ACT573E

Harris CorporationIn Stock: 2214CD74ACT573E 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

Substitution eligibility for the 74ACTQ573PC is determined by strict parametric alignment across the following critical criteria:

Primary Substitution Parameters:

• Logic Type: D-Type Transparent Latch (mandatory match)
• Circuit Configuration: 8:8 (mandatory match)
• Output Type: Tri-State (mandatory match)
• Voltage Supply Range: 4.5V ~ 5.5V (mandatory match)
• Package Type: 20-DIP (0.300", 7.62mm) (mandatory match)
• Mounting Type: Through Hole (mandatory match)
• Output Current Capability: 24mA minimum (mandatory match)

Secondary Compatibility Parameters:

• Propagation Delay: 6.5ns nominal (tolerance range acceptable)
• Operating Temperature Range: -40°C ~ 85°C minimum (extended ranges acceptable)
• Independent Circuits: 1 channel (mandatory match)

All identified substitute parts meet these mandatory criteria, enabling direct functional replacement in applications designed for the 74ACTQ573PC.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74ACT573N (Texas Instruments)

The SN74ACT573N represents the optimal substitute for the 74ACTQ573PC. This part maintains identical parametric specifications across all critical substitution criteria, including propagation delay (6ns), operating temperature range (-40°C ~ 85°C), and output current ratings (24mA). The component carries Active product status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment for new designs. Current inventory of 2065 units supports immediate procurement requirements.

Secondary Recommendation: TC74ACT573P(F) (Toshiba Semiconductor and Storage)

The TC74ACT573P(F) provides an alternative with Active product status and RoHS compliance. Propagation delay of 6.3ns remains within acceptable tolerance of the original specification. This option is suitable for applications where Toshiba component qualification is required or preferred. Inventory availability of 1087 units supports standard procurement cycles.

Alternative Option: SN74ACT563N (Texas Instruments)

The SN74ACT563N functions as a parametric equivalent with identical propagation delay (6.5ns) and operating temperature range. This part is recommended only when the specific latch function of the 563 variant aligns with application requirements. Active product status and ROHS3 compliance are confirmed. Inventory of 1420 units is available.

Not Recommended: CD74ACT573E (Harris Corporation)

While the CD74ACT573E meets all mandatory substitution parameters, its Obsolete product status and RoHS non-compliance status limit suitability for new designs. The reduced propagation delay (3.1ns) and extended operating temperature range (-55°C ~ 125°C) do not provide functional advantages for standard applications. This option is suitable only for legacy system maintenance where Harris component qualification is specifically required.

Not Recommended: SN74ACT573NE4 (Texas Instruments)

The SN74ACT573NE4 carries Discontinued at DiGi Electronics status, indicating limited future availability. While ROHS3 compliance and Active status are confirmed, the discontinuation status makes this option unsuitable for designs requiring long-term component supply assurance.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT573N directly replace the 74ACTQ573PC without PCB modifications?

A: Yes. The SN74ACT573N is a direct pin-compatible replacement. Both components use the 20-DIP (0.300", 7.62mm) package with identical pinout. No PCB layout changes are required for substitution.

Q: What is the significance of the propagation delay differences shown in the comparison table?

A: Propagation delay variations (ranging from 3.1ns to 6.5ns) represent the time required for output state changes following input transitions. All substitute parts operate within acceptable timing margins for standard TTL logic applications. The CD74ACT573E exhibits faster propagation (3.1ns), while others cluster near the original specification (6ns to 6.5ns). Application-specific timing analysis is required only for high-speed or time-critical circuits.

Q: Why is the CD74ACT573E not recommended despite meeting all parametric requirements?

A: The CD74ACT573E carries Obsolete product status and RoHS non-compliance certification. These factors indicate limited future availability and potential regulatory restrictions in certain markets. For new designs, Active status components with current compliance certifications are preferred to ensure long-term supply chain stability and regulatory alignment.

Q: Are there functional differences between the 74ACT573 and 74ACT563 variants?

A: Both variants are D-Type Transparent Latches with identical 8:8 circuit configuration and tri-state output capability. The primary distinction lies in internal latch function implementation. The SN74ACT563N is suitable for substitution only when the specific latch behavior of the 563 variant is compatible with application requirements. Datasheet comparison of control signal timing and latch operation is recommended before selecting this alternative.

Q: What compliance certifications should be prioritized for new designs?

A: ROHS3 compliance is the current standard for new component selection. Both the SN74ACT573N and SN74ACT563N carry ROHS3 certification, ensuring compliance with current environmental and regulatory requirements. The TC74ACT573P(F) provides RoHS compliance, which is acceptable but represents an earlier compliance standard.

Q: Is extended operating temperature range (-55°C ~ 125°C) beneficial for standard applications?

A: Extended temperature range capability does not provide functional advantages for applications operating within the standard -40°C ~ 85°C envelope. The CD74ACT573E offers this extended range, but its Obsolete status and RoHS non-compliance outweigh this benefit. Selection based on extended temperature capability is appropriate only when application requirements specifically demand operation outside standard temperature limits.

Q: How should component inventory levels influence substitution decisions?

A: Current inventory availability supports immediate procurement for all recommended alternatives. The SN74ACT573N (2065 units) and TC74ACT573P(F) (1087 units) provide robust supply assurance. Inventory levels should be considered secondary to product status and compliance certifications when making long-term design decisions.