DM74S74N Equivalent & Substitute Parts

Part Overview

The DM74S74N is a dual D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 14-DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. The DM74S74N provides two independent D-type flip-flops with complementary outputs, set/preset and reset functionality, and positive edge triggering suitable for digital logic applications requiring reliable state storage and synchronization.

Substiute Parts

DM74S74N

onsemiIn Stock: 1222DM74S74N Datasheet

Current PartRFQ

SN74S74N

Texas InstrumentsIn Stock: 3982SN74S74N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74S74N is determined by strict equivalence across the following critical parameters:

Functional Equivalence: Both the main part and substitute must be dual D-type flip-flops with identical element count (2), bit configuration (1 bit per element), complementary output type, and set/preset plus reset functionality.

Electrical Compatibility: Supply voltage range (4.75V ~ 5.25V), output current specifications (1mA high, 20mA low), and trigger type (positive edge) must match exactly.

Package Compatibility: The 14-DIP (0.300", 7.62mm) through-hole package is mandatory for direct substitution in existing PCB layouts.

Series Alignment: Both parts belong to the 74S logic series, ensuring timing and electrical characteristics remain within acceptable parameters for the application.

The SN74S74N from Texas Instruments meets all substitution criteria and is classified as an active product with enhanced specifications, making it a direct functional equivalent suitable for replacement applications.

Parameter Comparison

Engineering Selection Recommendations

The SN74S74N from Texas Instruments is the direct functional equivalent for the obsolete DM74S74N. Selection of the SN74S74N is supported by the following factors:

Product Status: The SN74S74N maintains active product status, ensuring continued availability and manufacturing support. The DM74S74N's obsolete classification necessitates transition to an active equivalent.

Regulatory Compliance: The SN74S74N carries ROHS3 compliance certification, meeting current environmental and regulatory requirements. Both parts maintain REACH Unaffected and EAR99 ECCN classifications, ensuring consistent export and supply chain compliance.

Electrical Performance: The SN74S74N demonstrates enhanced clock frequency capability (110 MHz versus 65 MHz) while maintaining identical supply voltage, output current, and trigger specifications. This performance margin provides additional operational headroom without introducing incompatibility.

Package and Mounting: Identical 14-DIP through-hole packaging ensures direct PCB compatibility and eliminates redesign requirements for existing applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74S74N directly replace the DM74S74N in existing designs?

A: Yes. The SN74S74N is a direct functional equivalent with identical package, pinout, supply voltage, output current specifications, and trigger characteristics. No circuit modifications are required for substitution in through-hole PCB applications.

Q: What is the significance of the higher clock frequency specification in the SN74S74N?

A: The SN74S74N operates at 110 MHz maximum clock frequency compared to the DM74S74N's 65 MHz specification. This represents enhanced performance capability and does not create incompatibility. Applications operating at or below 65 MHz will function identically with either part.

Q: Are there any compliance or certification differences between these parts?

A: The SN74S74N carries ROHS3 compliance certification, while the DM74S74N does not specify RoHS status. Both parts maintain identical REACH Unaffected and EAR99 ECCN classifications. For applications requiring RoHS compliance, the SN74S74N is the appropriate selection.

Q: Does the 14-DIP package remain standard for both parts?

A: Yes. Both the DM74S74N and SN74S74N use the 14-DIP (0.300", 7.62mm) through-hole package. Pin configuration, spacing, and mounting requirements are identical, enabling direct PCB substitution without layout modifications.

Q: What is the inventory status for these parts?

A: The DM74S74N (onsemi) has 1144 pieces in stock as new original inventory. The SN74S74N (Texas Instruments) has 3900 pieces in stock as new original inventory. The SN74S74N's higher inventory level and active product status provide superior long-term availability assurance.