SN74AHCT74MDREP Equivalent & Substitute Parts

Part Overview

The SN74AHCT74MDREP is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments in the 74AHCT series. This device features complementary outputs, positive edge triggering, and set/reset functionality. The part is currently active in production and widely used in digital logic applications requiring reliable state storage and synchronization. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific requirements.

Substiute Parts

SN74AHCT74MDREP

Texas InstrumentsIn Stock: 751SN74AHCT74MDREP Datasheet

Current PartRFQ

MC74VHCT74ADR2G

onsemiIn Stock: 5665MC74VHCT74ADR2G Datasheet

DirectRFQ

74AHCT74D,118

NXP SemiconductorsIn Stock: 1343174AHCT74D,118 Datasheet

MFR RecommendedRFQ

MC74VHC74DR2G

onsemiIn Stock: 1968MC74VHC74DR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74AHCT74MDREP are qualified based on the following electrical and mechanical parameters:

• Functional equivalence: Dual D-type flip-flop with complementary outputs and positive edge triggering
• Package compatibility: 14-SOIC form factor with identical pin configuration
• Electrical performance: Clock frequency, propagation delay, supply voltage range, and output current ratings
• Operating temperature range: Support for the specified thermal envelope
• Compliance and certifications: RoHS3 compliance and active product status

Substitutes are grouped into two categories: direct equivalents (identical electrical specifications) and functional alternatives (compatible within specified parameter tolerances).

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute): MC74VHCT74ADR2G (onsemi) – Identical electrical specifications to the SN74AHCT74MDREP, including 140 MHz clock frequency, 8.8 ns propagation delay, and 4.5V–5.5V supply voltage range. ROHS3 compliant and active product status. Tape & Reel packaging available.

Manufacturer-Recommended Substitute: 74AHCT74D,118 (NXP Semiconductors) – Same 74AHCT series base product number with identical clock frequency and propagation delay. Operates within the same supply voltage range and output current specifications. Active product status. Note: Operating temperature range is -40°C to 125°C (does not extend to -55°C). Supplied in bulk packaging.

Functional Alternative (Extended Supply Voltage Range): MC74VHC74DR2G (onsemi) – Compatible D-type flip-flop with extended supply voltage range (2V–5.5V), enabling operation in lower-voltage applications. Clock frequency is 115 MHz and propagation delay is 9.3 ns, representing acceptable performance trade-offs for applications not requiring 140 MHz operation. ROHS3 compliant and active product status. Tape & Reel packaging available.

All substitute parts maintain identical pin configuration, package footprint, and functional behavior within their specified electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can MC74VHCT74ADR2G be used as a direct replacement for SN74AHCT74MDREP? A: Yes. Both parts are dual D-type flip-flops with identical electrical specifications: 140 MHz clock frequency, 8.8 ns propagation delay, 4.5V–5.5V supply voltage, and 8 mA output current. Pin configuration and 14-SOIC package are identical. The primary difference is manufacturer (onsemi vs. Texas Instruments).

Q: What is the difference between 74AHCT74D,118 and SN74AHCT74MDREP? A: Both are 74AHCT series devices with identical clock frequency, propagation delay, and supply voltage specifications. The key difference is operating temperature range: 74AHCT74D,118 operates from -40°C to 125°C, while SN74AHCT74MDREP operates from -55°C to 125°C. For applications requiring -55°C operation, SN74AHCT74MDREP or MC74VHCT74ADR2G are required. Packaging format differs: 74AHCT74D,118 is supplied in bulk; SN74AHCT74MDREP is supplied in Tape & Reel.

Q: When should MC74VHC74DR2G be selected instead of the primary part? A: MC74VHC74DR2G is suitable when the application requires extended supply voltage range (2V–5.5V) for low-voltage operation. Clock frequency is reduced to 115 MHz and propagation delay increases to 9.3 ns. Select this part only if the application does not require 140 MHz operation and benefits from the wider voltage range.

Q: Are all substitute parts RoHS3 compliant? A: MC74VHCT74ADR2G and MC74VHC74DR2G are explicitly ROHS3 compliant. 74AHCT74D,118 RoHS status is not specified in the provided data. Verify RoHS compliance with the manufacturer if required for your application.

Q: Do all substitute parts support Tape & Reel packaging? A: SN74AHCT74MDREP, MC74VHCT74ADR2G, and MC74VHC74DR2G are available in Tape & Reel format. 74AHCT74D,118 is supplied in bulk packaging. Confirm packaging availability with your supplier based on production requirements.

Q: What is the impact of input capacitance differences between parts? A: Input capacitance varies slightly: SN74AHCT74MDREP (2 pF), 74AHCT74D,118 (3 pF), MC74VHCT74ADR2G and MC74VHC74DR2G (4 pF). These differences are within typical design margins for digital logic applications and do not affect functional compatibility or pin configuration.