74ACQ573PC D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACQ573PC 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 system maintenance, redesign, and procurement planning. The part operates across a 2V to 6V supply voltage range with a propagation delay of 5.5ns and is housed in a 20-DIP package suitable for through-hole mounting applications.

Substiute Parts

74ACQ573PC

onsemiIn Stock: 90074ACQ573PC Datasheet

Current PartRFQ

CD74AC573E

Harris CorporationIn Stock: 1679CD74AC573E Datasheet

SimilarRFQ

SN74AC573N

Texas InstrumentsIn Stock: 2786SN74AC573N Datasheet

SimilarRFQ

SN74AC563N

Texas InstrumentsIn Stock: 1210SN74AC563N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACQ573PC are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Substitution Criteria:

• Logic Type: D-Type Transparent Latch (identical function)
• Circuit Configuration: 8:8 (identical channel and bit configuration)
• Output Type: Tri-State (identical output capability)
• Package / Case: 20-DIP (0.300", 7.62mm) (identical physical form factor)
• Mounting Type: Through Hole (identical mounting method)
• Voltage - Supply Range: Must encompass or match the 2V ~ 6V operating window
• Current - Output High, Low: Must meet or exceed 24mA, 24mA specification
• Operating Temperature: Must support -40°C ~ 85°C range or broader

The substitute parts listed below meet all core substitution criteria and are classified into two categories: direct equivalents (SN74AC573N, CD74AC573E) and parametric equivalents (SN74AC563N).

Parameter Comparison

Engineering Selection Recommendations

SN74AC573N (Texas Instruments) is the primary substitute for the 74ACQ573PC. This part maintains identical voltage supply range (2V ~ 6V), operating temperature range (-40°C ~ 85°C), and output current specifications (24mA, 24mA). The SN74AC573N offers superior propagation delay performance (2.5ns versus 5.5ns) and holds active product status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment.

SN74AC563N (Texas Instruments) serves as a parametric equivalent when the SN74AC573N is unavailable. This part maintains all critical electrical parameters within acceptable margins, with propagation delay of 4.6ns and identical voltage, temperature, and current specifications. The SN74AC563N is also active and ROHS3 compliant. Note that the base product number differs (74AC563 versus 74AC573), indicating a distinct part family variant with equivalent functional performance for this application.

CD74AC573E (Harris Corporation) is a functional equivalent with extended operating temperature range (-55°C ~ 125°C) and slightly reduced propagation delay (3ns). However, this part is classified as obsolete and carries RoHS non-compliant status, making it suitable only for legacy system maintenance where new procurement is not feasible. The voltage supply range (1.5V ~ 5.5V) is narrower than the original specification, requiring verification for applications operating at the upper voltage boundary (5.5V to 6V).

Frequently Asked Questions (FAQ)

Q: Can SN74AC573N be used as a direct replacement for 74ACQ573PC without circuit modifications?

A: Yes. The SN74AC573N maintains identical logic type, circuit configuration, output type, package form factor, and electrical specifications (voltage, current, temperature range). No circuit modifications are required for direct substitution in through-hole mounting applications.

Q: What is the difference between SN74AC573N and SN74AC563N?

A: Both parts are D-Type Transparent Latch ICs with 8:8 configuration and tri-state output in 20-DIP packages. The primary difference is the base product number (74AC573 versus 74AC563), indicating distinct part families. The SN74AC563N exhibits slightly higher propagation delay (4.6ns versus 2.5ns). Both are functionally equivalent for this application and maintain identical voltage, current, and temperature specifications.

Q: Why is CD74AC573E listed as a substitute if it is obsolete?

A: CD74AC573E is included for reference in legacy system maintenance scenarios where existing inventory may be available. However, for new designs or ongoing procurement, SN74AC573N or SN74AC563N are preferred due to active product status and regulatory compliance certifications.

Q: Does the narrower voltage range of CD74AC573E (1.5V ~ 5.5V) affect compatibility?

A: The CD74AC573E voltage range does not encompass the full 2V ~ 6V specification of the 74ACQ573PC. Applications operating at supply voltages between 5.5V and 6V require verification before substitution with CD74AC573E.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts are housed in 20-DIP (0.300", 7.62mm) packages with through-hole mounting, ensuring mechanical and footprint compatibility with the original 74ACQ573PC design.

Q: Which substitute part offers the best performance improvement?

A: SN74AC573N provides the fastest propagation delay at 2.5ns, representing a 55% improvement over the original 74ACQ573PC specification of 5.5ns. This performance enhancement may benefit timing-critical applications while maintaining full electrical and mechanical compatibility.