DM74AS874WM Equivalent & Substitute Parts

Part Overview

The DM74AS874WM is a dual 4-bit D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 24-SOIC surface mount package. This component functions as a master reset flip-flop with tri-state, non-inverted outputs, operating at a clock frequency of 80 MHz with a maximum propagation delay of 10.5ns at 5V with 50pF load.

The DM74AS874WM is classified as obsolete. Identifying equivalent and 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

DM74AS874WM

onsemiIn Stock: 826DM74AS874WM Datasheet

Current PartRFQ

SN74AS874DW

Texas InstrumentsIn Stock: 775SN74AS874DW Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74AS874WM is determined by strict equivalence across the following critical parameters:

• Functional Type: Dual 4-bit D-type flip-flop with master reset capability
• Output Configuration: Tri-state, non-inverted outputs
• Electrical Specifications: Voltage supply range (4.5V ~ 5.5V), output current ratings (15mA high, 48mA low), quiescent current (133 mA)
• Timing Characteristics: Maximum propagation delay of 10.5ns at 5V with 50pF load
• Trigger Mechanism: Positive edge triggering
• Package Compatibility: 24-SOIC surface mount package with identical physical dimensions (0.295", 7.50mm width)
• Operating Temperature Range: 0°C ~ 70°C

The substitute part SN74AS874DW from Texas Instruments meets all these criteria and maintains full electrical and mechanical compatibility with the original DM74AS874WM.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS874DW from Texas Instruments is a direct functional and electrical equivalent to the DM74AS874WM. Selection of the SN74AS874DW is supported by the following factors:

• Product Status: The SN74AS874DW maintains active manufacturing status, ensuring long-term availability and supply chain continuity compared to the obsolete DM74AS874WM.
• Compliance: The SN74AS874DW is ROHS3 compliant, meeting current regulatory requirements for electronic components in regulated markets.
• Electrical Equivalence: All critical electrical parameters—voltage supply, output current, quiescent current, propagation delay, and operating temperature range—are identical between the two parts.
• Package Compatibility: Both parts use the identical 24-SOIC surface mount package with matching physical dimensions, enabling direct PCB-level substitution without layout modifications.
• Performance Enhancement: The SN74AS874DW operates at 125 MHz clock frequency, exceeding the 80 MHz specification of the DM74AS874WM, providing additional performance margin in timing-critical applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS874DW be used as a direct replacement for the DM74AS874WM on existing PCBs?

A: Yes. The SN74AS874DW is a direct pin-for-pin and functionally equivalent substitute. Both parts use the identical 24-SOIC package with matching pinout, electrical characteristics, and operating parameters. No PCB modifications are required.

Q: What are the key differences between the DM74AS874WM and SN74AS874DW?

A: The primary differences are manufacturer (onsemi versus Texas Instruments), product status (obsolete versus active), and clock frequency specification (80 MHz versus 125 MHz). All electrical parameters, package dimensions, and functional characteristics are identical.

Q: Is the SN74AS874DW compliant with current environmental regulations?

A: Yes. The SN74AS874DW is ROHS3 compliant, meeting current regulatory requirements for hazardous substance restrictions in electronic components.

Q: Are there any timing or performance considerations when substituting the SN74AS874DW for the DM74AS874WM?

A: No. The maximum propagation delay specification is identical at 10.5ns at 5V with 50pF load. The higher clock frequency rating of the SN74AS874DW (125 MHz versus 80 MHz) provides additional performance margin without introducing any compatibility issues.

Q: What is the operating temperature range for both parts?

A: Both the DM74AS874WM and SN74AS874DW operate across the identical temperature range of 0°C to 70°C (TA).

Q: Are the supply voltage requirements the same for both parts?

A: Yes. Both parts require a supply voltage range of 4.5V to 5.5V and have identical output current specifications (15mA high, 48mA low) and quiescent current (133 mA).