SN74AHC74D Equivalent & Substitute Parts

Part Overview

The SN74AHC74D 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 (Preset) and Reset functions, complementary outputs, and positive edge triggering. The part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements. Suitable alternatives exist across multiple manufacturers with maintained or enhanced electrical performance characteristics.

Substiute Parts

SN74AHC74D

Texas InstrumentsIn Stock: 2109SN74AHC74D Datasheet

Current PartRFQ

SN74AHC74DR

Texas InstrumentsIn Stock: 3645SN74AHC74DR Datasheet

DirectRFQ

74VHC74M

Fairchild SemiconductorIn Stock: 280274VHC74M Datasheet

DirectRFQ

MC74VHC74DR2G

onsemiIn Stock: 1968MC74VHC74DR2G Datasheet

DirectRFQ

74AHC74D,118

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

UpgradeRFQ

74AHC74D-Q100J

Nexperia USA Inc.In Stock: 115374AHC74D-Q100J Datasheet

UpgradeRFQ

74AHCT74D-Q100J

Nexperia USA Inc.In Stock: 88974AHCT74D-Q100J Datasheet

MFR RecommendedRFQ

MC74VHCT74ADR2G

onsemiIn Stock: 5665MC74VHCT74ADR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AHC74D is determined by the following critical parameters:

Electrical Compatibility Parameters:

• D-type flip-flop architecture with 2 elements, 1 bit per element
• Positive edge trigger configuration
• Complementary output type
• Set (Preset) and Reset function capability
• Clock frequency: 115 MHz minimum
• Voltage supply range: 2V to 5.5V (or compatible subset)
• Output current capability: 8 mA minimum (high and low)
• Quiescent current: 2 µA maximum
• Operating temperature range: -40°C to 125°C (or extended range)

Mechanical Compatibility Parameters:

• Package type: 14-SOIC (0.154", 3.90mm Width)
• Surface mount mounting type
• Pin-to-pin compatibility with 14-SOIC footprint

Compliance Parameters:

• RoHS3 compliance
• REACH unaffected status

Substitute parts are grouped into three categories based on product status and performance characteristics: direct equivalents (identical electrical specifications), functional alternatives (enhanced or equivalent performance), and automotive-grade upgrades (AEC-Q100 qualified variants).

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute): SN74AHC74DR from Texas Instruments maintains identical electrical specifications to the SN74AHC74D with matching 6.1 ns propagation delay, 115 MHz clock frequency, and -40°C to 125°C operating range. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tube). This part is active and carries 3600 units in inventory, providing immediate availability for production requirements.

Functional Alternatives (74VHC Series): 74VHC74M (Fairchild Semiconductor) and MC74VHC74DR2G (onsemi) provide functional equivalence with slightly degraded propagation delay (9.3 ns versus 6.1 ns) but maintain all other critical parameters. MC74VHC74DR2G offers extended temperature range (-55°C to 125°C) and higher inventory availability (1900 units). These parts are suitable for applications where the additional propagation delay does not impact timing requirements.

Automotive-Grade Upgrades (AEC-Q100 Qualified): 74AHC74D-Q100J and 74AHCT74D-Q100J from Nexperia USA Inc. provide automotive-grade qualification with AEC-Q100 certification. The 74AHCT74D-Q100J variant offers enhanced clock frequency (140 MHz) and reduced propagation delay (8.8 ns) with restricted voltage supply range (4.5V to 5.5V). These parts are appropriate for automotive applications requiring formal qualification documentation.

Extended Temperature Range Option: MC74VHCT74ADR2G from onsemi combines automotive-grade performance with extended temperature range (-55°C to 125°C) and highest inventory availability (5647 units). This part operates at 140 MHz with 8.8 ns propagation delay and is suitable for demanding environmental conditions.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74AHC74D with SN74AHC74DR? A: Yes. Both parts are Texas Instruments 74AHC series devices with identical electrical specifications, operating parameters, and pin configuration. The difference is packaging format: SN74AHC74D uses Tube packaging while SN74AHC74DR uses Cut Tape & Digi-Reel format. Electrical performance and PCB footprint compatibility are identical.

Q: What is the difference between 74AHC and 74VHC series substitutes? A: Both series provide D-type flip-flop functionality with compatible pin configurations and package types. The 74AHC series (SN74AHC74D, 74AHC74D,118) delivers 6.1 ns propagation delay at 5V. The 74VHC series (74VHC74M, MC74VHC74DR2G) delivers 9.3 ns propagation delay. The 74AHC series is preferred when timing margins are critical; 74VHC series is acceptable for applications with relaxed timing requirements.

Q: Can I use 74AHCT74D-Q100J in place of SN74AHC74D? A: Functional substitution is possible with design considerations. The 74AHCT74D-Q100J operates at 4.5V to 5.5V (versus 2V to 5.5V for SN74AHC74D), limiting low-voltage applications. It provides superior clock frequency (140 MHz versus 115 MHz) and faster propagation delay (8.8 ns versus 6.1 ns). Use this part only if your design operates within the 4.5V to 5.5V supply range and requires automotive qualification.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts carry RoHS3 compliance certification and REACH unaffected status, matching the environmental compliance profile of the original SN74AHC74D.

Q: Which substitute offers the best availability? A: MC74VHCT74ADR2G from onsemi provides the highest inventory level at 5647 units in stock. This part combines automotive-grade qualification, extended temperature range (-55°C to 125°C), and active product status.

Q: What is the difference between 14-SOIC and 14-SO packaging? A: Both designations refer to 14-pin small outline integrated circuit packages with 0.154" (3.90mm) body width and identical pin spacing. The packages are mechanically and electrically interchangeable on standard PCB footprints. Nexperia parts use the 14-SO designation while other manufacturers use 14-SOIC; both refer to the same physical package.

Q: Can I use parts with different operating temperature ranges? A: Yes, if your application operates within the narrower temperature range. For example, 74VHC74M operates -40°C to 85°C (versus -40°C to 125°C for SN74AHC74D). Use this part only if your design does not require operation above 85°C. Extended range parts (MC74VHC74DR2G at -55°C to 125°C) are suitable for all temperature requirements of the original part.

Q: Is automotive qualification (AEC-Q100) required for my application? A: AEC-Q100 qualification is required only for automotive applications subject to automotive industry standards. For general industrial and consumer applications, non-qualified parts (SN74AHC74DR, 74VHC74M, MC74VHC74DR2G) are appropriate. Automotive-qualified variants (74AHC74D-Q100J, 74AHCT74D-Q100J, MC74VHCT74ADR2G) carry additional qualification documentation and traceability requirements.