74VHCT240ASJ Equivalent & Substitute Parts

Part Overview

The 74VHCT240ASJ is an inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The 74VHCT series operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-SOP package suitable for surface mount applications.

Substiute Parts

74VHCT240ASJ

onsemiIn Stock: 74074VHCT240ASJ Datasheet

Current PartRFQ

SN74AHCT240DW

Texas InstrumentsIn Stock: 1084SN74AHCT240DW Datasheet

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SN74AHCT240DWR

Texas InstrumentsIn Stock: 1683SN74AHCT240DWR Datasheet

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SN74AHCT240NSR

Texas InstrumentsIn Stock: 1971SN74AHCT240NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74VHCT240ASJ are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Electrical Compatibility Criteria:

• Logic Type: Buffer, Inverting (identical function)
• Number of Elements: 2 (identical configuration)
• Number of Bits per Element: 4 (identical configuration)
• Output Type: 3-State (identical output capability)
• Current - Output High, Low: 8mA, 8mA (identical drive capability)
• Voltage - Supply: 4.5V ~ 5.5V (identical supply range)

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount (identical mounting method)
• Package / Case: 20-SOIC form factor (pin-compatible packages)

Compliance Criteria:

• Moisture Sensitivity Level (MSL): 1 (Unlimited) (identical handling requirements)
• REACH Status: REACH Unaffected (identical regulatory status)
• ECCN: EAR99 (identical export classification)

The substitute parts listed below meet all electrical and mechanical requirements for direct replacement in applications using the 74VHCT240ASJ.

Parameter Comparison

Engineering Selection Recommendations

SN74AHCT240DWR (Texas Instruments) - Recommended Primary Substitute

The SN74AHCT240DWR is the preferred substitute for the 74VHCT240ASJ. This part maintains active product status with Texas Instruments, ensuring long-term availability and supply chain stability. It carries ROHS3 compliance certification and meets all electrical and mechanical compatibility requirements. The extended operating temperature range (-40°C to 125°C) provides additional thermal margin compared to the original part. Packaging in Tape & Reel format supports automated assembly processes.

SN74AHCT240NSR (Texas Instruments) - Alternative Substitute

The SN74AHCT240NSR offers identical electrical specifications and maintains active product status. This variant features the same 20-SOIC package width (0.209", 5.30mm) as the original 74VHCT240ASJ, providing exact mechanical compatibility without PCB layout modifications. ROHS3 compliance and Tape & Reel packaging are included.

SN74AHCT240DW (Texas Instruments) - Secondary Option

The SN74AHCT240DW meets all electrical requirements but carries a discontinued status at DiGi Electronics. This part should be considered only when primary substitutes are unavailable. The 20-SOIC package width (0.295", 7.50mm) differs from the original, requiring PCB layout verification.

All substitute parts maintain REACH Unaffected and EAR99 export classification status, ensuring regulatory compliance equivalent to the original component.

Frequently Asked Questions (FAQ)

Q: Can the SN74AHCT240DWR directly replace the 74VHCT240ASJ without PCB modifications?

A: The SN74AHCT240DWR is electrically compatible and functionally equivalent. However, the package width differs (7.50mm versus 5.30mm). PCB layout verification is required to confirm footprint compatibility with existing designs.

Q: What is the difference between SN74AHCT240DWR and SN74AHCT240NSR?

A: Both parts are electrically identical with active product status and ROHS3 compliance. The primary difference is package width: SN74AHCT240DWR uses 20-SOIC (0.295", 7.50mm) while SN74AHCT240NSR uses 20-SOIC (0.209", 5.30mm). The SN74AHCT240NSR matches the original 74VHCT240ASJ package width exactly.

Q: Why does the 74VHCT240ASJ show as obsolete?

A: The 74VHCT240ASJ is classified as obsolete by onsemi. The listed substitute parts from Texas Instruments provide equivalent functionality with active or recently discontinued status, ensuring design continuity.

Q: Are all substitute parts RoHS compliant?

A: All Texas Instruments substitute parts (SN74AHCT240DW, SN74AHCT240DWR, SN74AHCT240NSR) carry ROHS3 compliance certification. The original 74VHCT240ASJ RoHS status is not specified in available documentation.

Q: What is the operating temperature difference between the original and substitutes?

A: The 74VHCT240ASJ operates from -40°C to 85°C. All Texas Instruments substitutes extend this range to -40°C to 125°C, providing additional thermal margin for demanding applications.

Q: Are moisture sensitivity levels identical across all parts?

A: Yes. The 74VHCT240ASJ and all substitute parts carry MSL 1 (Unlimited) classification, indicating identical moisture handling and storage requirements.