DM74AS573N Equivalent & Substitute Parts

Part Overview

The DM74AS573N is an octal D-type transparent latch IC manufactured by onsemi, designed for digital logic applications requiring 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-pin DIP package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement continuity.

Substiute Parts

DM74AS573N

onsemiIn Stock: 1493DM74AS573N Datasheet

Current PartRFQ

SN74AS573AN

Texas InstrumentsIn Stock: 2152SN74AS573AN Datasheet

DirectRFQ

SN54AS573AJ

Texas InstrumentsIn Stock: 1159SN54AS573AJ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DM74AS573N is determined by strict alignment with the following critical parameters:

• Logic Function: D-type transparent latch architecture with 8:8 channel configuration
• Output Characteristics: Tri-state output capability
• Supply Voltage: 4.5V to 5.5V operating range
• Package Compatibility: 20-pin DIP form factor with 0.300" (7.62mm) pitch
• Mounting Method: Through-hole technology
• Circuit Count: Single independent circuit

Substitute parts are categorized into two groups:

Direct Substitutes maintain identical or compatible electrical and mechanical specifications within the commercial temperature range (0°C ~ 70°C).

Similar Substitutes meet core functional requirements but operate across extended temperature ranges (-55°C ~ 125°C), requiring verification of application temperature constraints before deployment.

Parameter Comparison

Engineering Selection Recommendations

SN74AS573AN is the primary direct substitute for DM74AS573N. Both components share identical supply voltage specifications, temperature operating range, and package form factor. The SN74AS573AN is manufactured by Texas Instruments and maintains active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Propagation delay increases from 3ns to 6ns and output current specifications differ; these variations require circuit-level timing and drive capability verification before implementation.

SN54AS573AJ serves as an alternative for applications requiring extended temperature operation (-55°C ~ 125°C). This component is suitable only when system design accommodates the wider temperature range and when the commercial temperature specification of the original DM74AS573N is not a constraint. The SN54AS573AJ uses a 20-CDIP package variant, which maintains mechanical compatibility with standard 20-DIP footprints but may require socket or PCB layout confirmation.

Selection between direct and similar substitutes depends on application temperature requirements and timing margin availability. Both alternatives are REACH compliant and ROHS3 certified, supporting modern supply chain and environmental compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74AS573AN directly replace DM74AS573N without circuit modifications?

A: SN74AS573AN maintains functional compatibility through identical logic type, circuit configuration, output type, supply voltage range, and package form factor. However, propagation delay increases from 3ns to 6ns, and output current specifications differ. Circuit timing analysis is required to confirm that the increased delay does not violate system timing constraints. Drive capability must be verified against load requirements.

Q: What is the difference between the 74AS and 54AS series designations?

A: The 74AS series operates across the commercial temperature range (0°C ~ 70°C), while the 54AS series operates across the military temperature range (-55°C ~ 125°C). The SN54AS573AJ is suitable only for applications requiring extended temperature operation beyond the original DM74AS573N specification.

Q: Are the 20-DIP and 20-CDIP packages mechanically interchangeable?

A: Both packages maintain the 0.300" (7.62mm) pitch and 20-pin configuration, providing mechanical compatibility with standard DIP sockets and PCB footprints. However, package variant differences may affect thermal characteristics and mechanical fit in specific socket designs. Verification with the target socket or PCB layout is recommended.

Q: What compliance certifications apply to the substitute parts?

A: Both SN74AS573AN and SN54AS573AJ are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The original DM74AS573N does not specify RoHS status but maintains REACH unaffected classification.

Q: How do output current differences affect circuit design?

A: The DM74AS573N provides 15mA high and 48mA low output current. SN74AS573AN provides 2.6mA high and 24mA low, while SN54AS573AJ provides 12mA high and 32mA low. Load impedance and fan-out requirements must be evaluated against the selected substitute to ensure adequate drive capability.

Q: Is the DM74AS573N still available for procurement?

A: The DM74AS573N is classified as obsolete. Active substitutes (SN74AS573AN and SN54AS573AJ) are available from Texas Instruments and recommended for new designs and ongoing system support.