DM74AS74MX Equivalent & Substitute Parts

Part Overview

The DM74AS74MX is a dual D-type flip-flop logic integrated circuit manufactured by onsemi in 14-SOIC surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The DM74AS74MX serves applications requiring dual 1-bit D-type flip-flops with complementary outputs, positive edge triggering, and set/reset functionality.

Substiute Parts

DM74AS74MX

onsemiIn Stock: 1186DM74AS74MX Datasheet

Current PartRFQ

SN74AS74AD

Texas InstrumentsIn Stock: 2172SN74AS74AD Datasheet

DirectRFQ

SN74AS74ADR

Texas InstrumentsIn Stock: 5740SN74AS74ADR Datasheet

DirectRFQ

SN74AS74ANSR

Texas InstrumentsIn Stock: 3713SN74AS74ANSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74AS74MX is determined by strict equivalence across the following critical parameters:

• Functional Type: D-Type flip-flop with dual 1-bit elements and complementary outputs
• Trigger Characteristic: Positive edge triggering
• Control Functions: Set (Preset) and Reset capability
• Electrical Performance: 105 MHz clock frequency, 9 ns maximum propagation delay @ 5V/50pF
• Supply Voltage: 4.5V ~ 5.5V operating range
• Output Drive Capability: 2 mA high, 20 mA low
• Quiescent Current: 16 mA
• Operating Temperature Range: 0°C ~ 70°C
• Mounting and Packaging: Surface mount, 14-SOIC package

Substitute parts are classified into two categories:

Direct Substitutes (identical package and electrical specifications):

• SN74AS74AD (Texas Instruments, Tube packaging)
• SN74AS74ADR (Texas Instruments, Tape & Reel packaging)

Similar Substitute (functionally equivalent with package variation):

• SN74AS74ANSR (Texas Instruments, 14-SOP with 0.209" width vs. 0.154" width)

Parameter Comparison

Engineering Selection Recommendations

SN74AS74ADR is the primary recommended substitute for the obsolete DM74AS74MX. This part maintains identical electrical specifications, package dimensions, and pin configuration. The SN74AS74ADR carries Active product status with ROHS3 compliance and is available in Tape & Reel packaging suitable for automated assembly. Current inventory levels support production continuity.

SN74AS74AD provides an alternative direct substitute with identical electrical and mechanical specifications. This part is classified as Last Time Buy, indicating limited future availability. Selection of this part should account for long-term supply constraints.

SN74AS74ANSR is functionally equivalent but features a wider 14-SOP package (0.209" width versus 0.154" width). This part is suitable only for designs where PCB layout accommodates the increased package width. The wider package footprint requires board redesign and is not recommended for direct replacement without layout modification.

All three substitute parts maintain compliance with REACH regulations and possess unlimited moisture sensitivity ratings. Selection should prioritize SN74AS74ADR for new designs and ongoing production due to active status and superior long-term availability.

Frequently Asked Questions (FAQ)

Q: Can SN74AS74ADR directly replace DM74AS74MX without PCB modification?

A: Yes. The SN74AS74ADR maintains identical pin configuration, package dimensions (14-SOIC, 0.154" width), and electrical specifications. No PCB layout changes are required.

Q: What is the difference between SN74AS74AD and SN74AS74ADR?

A: Both parts are electrically and mechanically identical. The primary difference is packaging format: SN74AS74AD is supplied in Tube packaging, while SN74AS74ADR is supplied in Tape & Reel format. Tape & Reel packaging is standard for automated assembly processes.

Q: Why is SN74AS74ANSR listed as a similar substitute rather than a direct substitute?

A: The SN74AS74ANSR uses a 14-SOP package with 0.209" width, compared to the 0.154" width of the standard 14-SOIC package. This dimensional difference requires PCB footprint modification and is not a pin-compatible replacement without layout redesign.

Q: What is the product status significance for these substitutes?

A: SN74AS74ADR carries Active status, ensuring continued manufacturing and long-term availability. SN74AS74AD is Last Time Buy, indicating limited future production. For new designs and long-term production, SN74AS74ADR is the preferred choice.

Q: Are all substitute parts RoHS compliant?

A: Yes. SN74AS74AD, SN74AS74ADR, and SN74AS74ANSR are all ROHS3 compliant. The original DM74AS74MX RoHS status was not specified in available documentation.

Q: Do the substitute parts maintain the same electrical performance?

A: Yes. All substitute parts maintain identical clock frequency (105 MHz), propagation delay (9 ns @ 5V, 50pF), output drive capability (2 mA high, 20 mA low), supply voltage range (4.5V ~ 5.5V), and operating temperature range (0°C ~ 70°C).