DM74AS874WMX Equivalent & Substitute Parts

Part Overview

The DM74AS874WMX is a dual 4-bit D-type flip-flop logic integrated circuit manufactured by onsemi in 24-SOIC surface mount packaging. This component functions as a master reset flip-flop with tri-state, non-inverted outputs, designed for digital logic applications requiring edge-triggered data capture and storage.

The DM74AS874WMX is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

DM74AS874WMX

onsemiIn Stock: 2340DM74AS874WMX Datasheet

Current PartRFQ

SN74AS874DW

Texas InstrumentsIn Stock: 775SN74AS874DW Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM74AS874WMX are identified based on strict electrical and mechanical compatibility criteria. The following parameters determine valid substitution:

Critical Matching Parameters:

• Functional type: D-Type flip-flop with dual 4-bit configuration
• Output configuration: Tri-state, non-inverted outputs
• Trigger mechanism: Positive edge triggering
• Voltage supply range: 4.5V ~ 5.5V
• Package type: 24-SOIC surface mount
• Propagation delay: 10.5 ns @ 5V, 50pF
• Output current ratings: 15 mA (high), 48 mA (low)
• Quiescent current: 133 mA

The SN74AS874DW from Texas Instruments meets all critical electrical parameters and package requirements, establishing it as a direct functional equivalent to the DM74AS874WMX.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS874DW is a direct electrical and mechanical equivalent to the DM74AS874WMX. Selection of this substitute is supported by the following factors:

Product Status: The SN74AS874DW maintains active product status with Texas Instruments, ensuring ongoing availability and manufacturing support. The DM74AS874WMX is obsolete, making the SN74AS874DW the appropriate choice for new designs and ongoing supply requirements.

Compliance and Certifications: The SN74AS874DW is RoHS3 compliant, meeting current environmental and regulatory standards. Both parts share identical REACH status (REACH Unaffected) and ECCN classification (EAR99), ensuring regulatory compatibility.

Electrical Performance: The SN74AS874DW exceeds the minimum performance specifications of the DM74AS874WMX. The clock frequency rating of 125 MHz surpasses the 80 MHz specification of the original part, while all other critical electrical parameters remain identical. This performance margin provides additional design headroom.

Package Compatibility: Both parts utilize identical 24-SOIC surface mount packaging with matching pinout and mechanical dimensions, enabling direct board-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS874DW be used as a direct replacement for the DM74AS874WMX?

A: Yes. The SN74AS874DW is electrically and mechanically equivalent to the DM74AS874WMX. All critical parameters including output type, propagation delay, voltage supply range, output current ratings, and package configuration are identical. The parts are pin-compatible and can be substituted without circuit modifications.

Q: What are the key differences between these parts?

A: The primary differences are manufacturer (onsemi versus Texas Instruments) and product status (obsolete versus active). The SN74AS874DW has a higher clock frequency rating (125 MHz versus 80 MHz), which represents improved performance capability. The SN74AS874DW is RoHS3 compliant, while the DM74AS874WMX compliance status is not specified.

Q: Are there any package or pinout considerations for substitution?

A: No. Both parts use identical 24-SOIC surface mount packaging with 0.295" width and 7.50mm body dimensions. Pinout and mechanical compatibility are complete, allowing direct board-level substitution.

Q: Why is the DM74AS874WMX classified as obsolete?

A: The DM74AS874WMX is an older logic component from onsemi's 74AS series. Obsolescence reflects the component's age and reduced market demand as newer logic families and manufacturers have become dominant. The SN74AS874DW from Texas Instruments remains in active production.

Q: What is the significance of the higher clock frequency rating on the SN74AS874DW?

A: The SN74AS874DW's 125 MHz clock frequency rating exceeds the 80 MHz specification of the DM74AS874WMX. This higher rating indicates improved performance capability and provides additional design margin for timing-critical applications. The part remains fully compatible with designs specified for 80 MHz operation.

Q: Are there supply chain advantages to using the SN74AS874DW?

A: Yes. The SN74AS874DW is an active product with ongoing manufacturing support from Texas Instruments. The DM74AS874WMX is obsolete and subject to limited availability. Using the SN74AS874DW ensures reliable long-term supply for production and maintenance applications.