SN74AS574DW Equivalent & Substitute Parts

Part Overview

The SN74AS574DW is an octal D-type flip-flop logic integrated circuit manufactured by Texas Instruments. This device functions as a standard 8-bit positive edge-triggered flip-flop with tri-state, non-inverted outputs, housed in a 20-SOIC surface mount package. The SN74AS574DW is designated as Last Time Buy, indicating discontinued production status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications requiring this logic function.

Substiute Parts

SN74AS574DW

Texas InstrumentsIn Stock: 882SN74AS574DW Datasheet

Current PartRFQ

SN74AS574DWR

Texas InstrumentsIn Stock: 3268SN74AS574DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AS574DW is determined by strict equivalence across the following critical parameters:

• Logic Function: D-type flip-flop with 8-bit capacity and positive edge triggering
• Output Configuration: Tri-state, non-inverted outputs
• Electrical Performance: 90 MHz clock frequency, 9 ns maximum propagation delay, 4.5V–5.5V supply voltage
• Package Specification: 20-SOIC surface mount package with identical physical dimensions (0.295", 7.50mm width)
• Current Characteristics: 15 mA output high current, 48 mA output low current, 116 mA quiescent current
• Environmental Compliance: ROHS3 compliance and MSL rating

The SN74AS574DWR qualifies as a direct substitute based on identical electrical specifications, functional performance, and package compatibility. The primary distinction is packaging format (Tube versus Bulk) and product status (Last Time Buy versus Active).

Parameter Comparison

Engineering Selection Recommendations

The SN74AS574DWR is the direct substitute for the SN74AS574DW. Both parts maintain identical electrical and functional specifications, ensuring pin-for-pin compatibility and equivalent circuit performance. The SN74AS574DWR is preferred for new designs and ongoing production due to its Active product status, whereas the SN74AS574DW is designated Last Time Buy and subject to discontinuation.

Both parts satisfy ROHS3 compliance and REACH regulatory requirements, making them suitable for applications requiring environmental and regulatory adherence. The distinction between Tube and Bulk packaging does not affect electrical performance or functional compatibility; packaging selection depends on procurement volume and handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS574DWR directly replace the SN74AS574DW in existing designs?

A: Yes. The SN74AS574DWR is electrically and functionally identical to the SN74AS574DW. Both devices share the same pin configuration, electrical specifications, and 20-SOIC package dimensions. No circuit modifications are required.

Q: What is the difference between Tube and Bulk packaging?

A: Tube and Bulk refer to packaging formats for component delivery. Tube packaging typically contains smaller quantities in protective plastic tubes, while Bulk packaging contains larger quantities in reels or trays. Both formats contain identical components with no electrical or functional differences.

Q: Why is the SN74AS574DW marked as Last Time Buy?

A: Last Time Buy designation indicates that Texas Instruments has discontinued production of this specific part number variant. The SN74AS574DWR, with Active status, represents the current production equivalent and should be used for new designs and ongoing supply requirements.

Q: Are there any compliance differences between the two parts?

A: No. Both the SN74AS574DW and SN74AS574DWR are ROHS3 compliant and REACH unaffected. They meet identical environmental and regulatory standards.

Q: What are the critical parameters for substitution compatibility?

A: Substitution compatibility is determined by: D-type flip-flop logic function, 8-bit configuration, positive edge triggering, tri-state non-inverted outputs, 90 MHz clock frequency, 9 ns propagation delay, 4.5V–5.5V supply voltage, 20-SOIC package, and identical current specifications. All these parameters are matched between the SN74AS574DW and SN74AS574DWR.