SN74AC74MDREP Equivalent & Substitute Parts

Part Overview

The SN74AC74MDREP is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments in a 14-SOIC surface mount package. This component functions as a Set/Preset and Reset element with complementary outputs, operating at clock frequencies up to 160 MHz. The part is currently in active production status with 3307 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design flexibility demands sourcing from multiple qualified manufacturers within the same functional specification.

Substiute Parts

SN74AC74MDREP

Texas InstrumentsIn Stock: 3394SN74AC74MDREP Datasheet

Current PartRFQ

MC74AC74DR2G

onsemiIn Stock: 2964MC74AC74DR2G Datasheet

DirectRFQ

MC74AC74DG

onsemiIn Stock: 2540MC74AC74DG Datasheet

MFR RecommendedRFQ

NLV74AC74DR2G

onsemiIn Stock: 3631NLV74AC74DR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74AC74MDREP is determined by the following critical parameters:

Functional Equivalence Requirements:

• D-Type flip-flop architecture with 2 elements and 1 bit per element
• Complementary output configuration
• Positive edge trigger type
• Clock frequency capability of 160 MHz minimum
• Propagation delay not exceeding 10 ns at 5V with 50 pF load

Electrical Compatibility Requirements:

• Supply voltage range: 2V to 6V
• Output current capability: 24 mA minimum (both high and low)
• Package type: 14-SOIC (0.154", 3.90mm Width)

Manufacturing & Compliance Requirements:

• ROHS3 compliance
• Surface mount mounting type
• Active or recently active product status

Three substitute parts meet these criteria with variations in packaging format, quiescent current specifications, and product lifecycle status.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Status):

MC74AC74DR2G and MC74AC74DG are functionally equivalent to the SN74AC74MDREP with identical propagation delay specifications. Both parts are manufactured by onsemi and maintain active product status. The selection between these two depends on packaging format requirements: MC74AC74DR2G is supplied in Tape & Reel format suitable for automated assembly, while MC74AC74DG is supplied in Tube format for manual handling or lower-volume applications.

Both onsemi parts operate within the -40°C to 85°C temperature range, which is narrower than the Texas Instruments part. Applications requiring the full -55°C to 125°C operating range must retain the SN74AC74MDREP.

Quiescent current for both onsemi parts is 4 µA, compared to 2 µA for the Texas Instruments part. This difference is significant only in ultra-low-power applications where standby current consumption is critical.

Secondary Substitute (Obsolete Status):

NLV74AC74DR2G is an onsemi part with obsolete product status. This part exhibits a propagation delay of 12.5 ns at 5V with 50 pF load, exceeding the 10 ns specification of the primary part. Additionally, quiescent current is specified at 40 µA, substantially higher than all other options. This part should be used only when no other alternatives are available and timing margins permit the increased propagation delay.

Compliance & Certification:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the primary part's regulatory standing.

Frequently Asked Questions (FAQ)

Q: Can MC74AC74DR2G be used as a direct replacement for SN74AC74MDREP in all applications?

A: MC74AC74DR2G is functionally equivalent for applications operating within the -40°C to 85°C temperature range. If your design requires operation at temperatures below -40°C or above 85°C, the SN74AC74MDREP must be retained. Propagation delay and output current specifications are identical, ensuring timing compatibility.

Q: What is the difference between MC74AC74DR2G and MC74AC74DG?

A: Both parts are electrically identical. The difference is packaging format: MC74AC74DR2G is supplied in Tape & Reel (TR) format for automated pick-and-place assembly, while MC74AC74DG is supplied in Tube format for manual component handling. Select based on your manufacturing process requirements.

Q: Why does NLV74AC74DR2G have higher propagation delay and quiescent current?

A: NLV74AC74DR2G is an obsolete part number. The increased propagation delay (12.5 ns versus 10 ns) and quiescent current (40 µA versus 2-4 µA) reflect older manufacturing specifications. This part should be avoided in new designs unless legacy system compatibility is required.

Q: Are all substitute parts in the same 14-SOIC package?

A: Yes. All parts listed use the 14-SOIC (0.154", 3.90mm Width) package with identical pin configuration and footprint. PCB layout and assembly tooling remain unchanged when substituting between these parts.

Q: Which substitute part should I select for new designs?

A: For new designs, select MC74AC74DR2G (Tape & Reel) for automated assembly or MC74AC74DG (Tube) for manual assembly. Both are active products with identical electrical specifications to the SN74AC74MDREP within the -40°C to 85°C operating range. If your application requires the extended -55°C to 125°C temperature range, retain the SN74AC74MDREP.

Q: Does quiescent current difference between parts affect circuit performance?

A: Quiescent current affects standby power consumption only. In active switching applications, this parameter has negligible impact. In battery-powered or ultra-low-power designs where the device spends extended periods in standby, the 2 µA specification of SN74AC74MDREP provides superior power efficiency compared to the 4 µA of onsemi parts or 40 µA of the obsolete NLV74AC74DR2G.