SN74AHC74MDREP Equivalent & Substitute Parts

Part Overview

The SN74AHC74MDREP is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments in 14-SOIC surface mount packaging. This device provides two independent D-type flip-flops with set and reset functionality, operating across a 2V to 5.5V supply range with a maximum clock frequency of 115 MHz. The part is actively produced and ROHS3 compliant, making it suitable for modern digital logic applications requiring edge-triggered storage elements. Equivalent and substitute parts are identified based on matching functional specifications, electrical performance parameters, and compatible packaging options.

Substiute Parts

SN74AHC74MDREP

Texas InstrumentsIn Stock: 3111SN74AHC74MDREP Datasheet

Current PartRFQ

MC74VHC74DR2G

onsemiIn Stock: 1968MC74VHC74DR2G Datasheet

DirectRFQ

MC74VHC74DTG

onsemiIn Stock: 9264MC74VHC74DTG Datasheet

DirectRFQ

74AHC74D,118

Nexperia USA Inc.In Stock: 471574AHC74D,118 Datasheet

MFR RecommendedRFQ

74VHC74M

Fairchild SemiconductorIn Stock: 280274VHC74M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74AHC74MDREP are qualified based on the following criteria:

Electrical Performance Match: All substitute parts maintain identical clock frequency (115 MHz), propagation delay (9.3 ns @ 5V, 50pF), supply voltage range (2V ~ 5.5V), output current capability (8mA), and quiescent current (2 µA). These parameters ensure functional equivalence in digital logic applications.

Functional Equivalence: All substitutes provide dual D-type flip-flops with set/preset and reset functions, positive edge triggering, and complementary outputs.

Packaging Compatibility: Substitutes are grouped by package type. The primary group maintains 14-SOIC packaging (0.154", 3.90mm Width) for direct board-level replacement. An alternative group offers 14-TSSOP packaging (0.173", 4.40mm Width) for applications where this package is preferred or required.

Temperature Range Consideration: The main part operates from -55°C to 125°C. Some substitutes operate within -40°C to 125°C or -40°C to 85°C ranges, which may be acceptable depending on application requirements.

Manufacturer Diversity: Substitutes are sourced from multiple manufacturers (onsemi, Nexperia USA Inc., Fairchild Semiconductor) to provide supply chain flexibility while maintaining electrical and functional specifications.

Parameter Comparison

Engineering Selection Recommendations

14-SOIC Package Direct Replacements: MC74VHC74DR2G (onsemi), 74AHC74D,118 (Nexperia USA Inc.), and 74VHC74M (Fairchild Semiconductor) are pin-compatible alternatives in 14-SOIC packaging. All three maintain identical electrical performance and are actively produced with ROHS3 compliance. Selection among these options depends on supply availability, lead time, and procurement preferences.

14-TSSOP Package Alternative: MC74VHC74DTG (onsemi) provides equivalent electrical performance in 14-TSSOP packaging. This option is suitable for designs where TSSOP packaging is specified or preferred, though board layout modifications are required due to different package dimensions.

Temperature Range Consideration: The 74VHC74M (Fairchild Semiconductor) operates within -40°C to 85°C, which is narrower than the main part's -55°C to 125°C range. This substitute is appropriate only for applications with operating temperature requirements within this narrower band. The 74AHC74D,118 (Nexperia) operates from -40°C to 125°C, providing extended high-temperature capability while maintaining the lower temperature limit at -40°C.

Supply Chain Flexibility: All substitute parts are actively produced and available in commercial quantities, supporting design flexibility and long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can MC74VHC74DR2G be used as a direct replacement for SN74AHC74MDREP?

A: Yes. MC74VHC74DR2G maintains identical electrical specifications, clock frequency, propagation delay, supply voltage range, and output current capability. Both are packaged in 14-SOIC with identical pin configuration, enabling direct board-level substitution.

Q: What is the difference between 74AHC and 74VHC series?

A: Both series provide equivalent electrical performance and functional specifications for this dual D-type flip-flop application. The primary difference is manufacturer implementation. Selection between series depends on supply availability and procurement strategy rather than electrical performance.

Q: Is MC74VHC74DTG compatible with the original design?

A: MC74VHC74DTG provides identical electrical performance but uses 14-TSSOP packaging instead of 14-SOIC. Pin configuration and electrical specifications are equivalent, but board layout modifications are required due to different package footprint dimensions (0.173" vs 0.154" width).

Q: What is the significance of input capacitance differences?

A: Input capacitance values (2 pF to 4 pF) are within normal manufacturing variation for this device class and do not affect functional compatibility or circuit performance in typical digital logic applications.

Q: Can 74VHC74M be used in applications requiring -55°C operation?

A: No. The 74VHC74M operates from -40°C to 85°C. For applications requiring -55°C minimum operating temperature, use SN74AHC74MDREP, MC74VHC74DR2G, MC74VHC74DTG, or 74AHC74D,118.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental compliance profile.