74VHCT74ASJ Equivalent & Substitute Parts

Part Overview

The 74VHCT74ASJ is a dual D-type flip-flop logic integrated circuit manufactured by onsemi, featuring complementary outputs and positive edge triggering. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74VHCT series operates within the 4.5V to 5.5V supply voltage range and is designed for applications requiring reliable digital logic switching at clock frequencies up to 140 MHz.

Substiute Parts

74VHCT74ASJ

onsemiIn Stock: 67474VHCT74ASJ Datasheet

Current PartRFQ

SN74AHCT74NSR

Texas InstrumentsIn Stock: 3160SN74AHCT74NSR Datasheet

DirectRFQ

74AHCT74D,118

NXP SemiconductorsIn Stock: 1343174AHCT74D,118 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74VHCT74ASJ are qualified based on the following critical parameters that determine functional and electrical compatibility:

Core Functional Parameters:

• Type: D-Type Flip-Flop with dual elements
• Number of Elements: 2
• Number of Bits per Element: 1
• Output Type: Complementary
• Trigger Type: Positive Edge
• Function: Set(Preset) and Reset capability

Electrical Parameters:

• Clock Frequency: 140 MHz minimum
• Max Propagation Delay @ 5V, 50pF: 8.8 ns maximum
• Voltage - Supply: 4.5V ~ 5.5V
• Current - Output High, Low: 8mA, 8mA
• Current - Quiescent (Iq): 2 µA maximum

Physical Parameters:

• Mounting Type: Surface Mount
• Package / Case: 14-SOIC form factor
• Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts must maintain all core functional parameters and meet or exceed electrical specifications. Package dimensions may vary within the 14-SOIC family while maintaining mechanical compatibility with standard PCB layouts.

Parameter Comparison

Engineering Selection Recommendations

SN74AHCT74NSR (Texas Instruments) is the primary direct substitute for the 74VHCT74ASJ. This part maintains identical electrical specifications and package dimensions while offering active product status with extended operating temperature range (-40°C ~ 125°C). The SN74AHCT74NSR carries RoHS3 compliance certification, supporting modern manufacturing and environmental standards.

74AHCT74D,118 (NXP Semiconductors) provides functional equivalence with identical electrical performance. This part is available in bulk packaging and offers active product status. The package dimensions differ slightly (0.154" versus 0.209" width), which may require PCB layout verification for mechanical compatibility, though both conform to the 14-SOIC standard.

Both substitute parts are active products from established semiconductor manufacturers, ensuring long-term availability and supply chain stability compared to the obsolete 74VHCT74ASJ.

Frequently Asked Questions (FAQ)

Q: Can the SN74AHCT74NSR directly replace the 74VHCT74ASJ without circuit modifications?

A: Yes. The SN74AHCT74NSR maintains all critical electrical parameters including supply voltage range (4.5V ~ 5.5V), output current (8mA), propagation delay (8.8 ns @ 5V, 50pF), and clock frequency (140 MHz). The package footprint is identical, enabling direct PCB substitution.

Q: What is the difference between the two substitute parts?

A: Both SN74AHCT74NSR and 74AHCT74D,118 meet the electrical requirements of the 74VHCT74ASJ. The primary differences are manufacturer (Texas Instruments versus NXP Semiconductors), packaging format (Tape & Reel versus Bulk), and package body width (0.209" versus 0.154"). The 74AHCT74D,118 requires verification of mechanical compatibility due to the narrower package width.

Q: Why does the 74AHCT74D,118 have a different package width?

A: Both parts conform to the 14-SOIC standard, but manufacturing tolerances and design variations between NXP and other manufacturers result in different body widths. The 0.154" width is within standard 14-SOIC specifications and is mechanically compatible with standard PCB layouts designed for 14-SOIC components.

Q: Are there temperature range considerations when substituting?

A: The 74VHCT74ASJ operates from -40°C to 85°C, while both substitute parts operate from -40°C to 125°C. This extended range in the substitute parts provides additional design margin and is fully backward compatible for applications within the original temperature specification.

Q: What compliance certifications apply to these substitute parts?

A: The SN74AHCT74NSR carries RoHS3 compliance. Both substitute parts maintain MSL 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status, consistent with the original 74VHCT74ASJ specifications.