74ABT240CSC Equivalent & Substitute Parts

Part Overview

The 74ABT240CSC 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 and substitute parts necessary for ongoing design support and procurement.

The 74ABT240CSC operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC package. Its primary function is signal buffering and inversion in digital logic applications, with output current ratings of 32mA (high) and 64mA (low).

Substiute Parts

74ABT240CSC

onsemiIn Stock: 94874ABT240CSC Datasheet

Current PartRFQ

SN74ABT2240ADW

Texas InstrumentsIn Stock: 1364SN74ABT2240ADW Datasheet

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SN74ABT2240ADWR

Texas InstrumentsIn Stock: 5443SN74ABT2240ADWR Datasheet

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SN74ABT2240ANSR

Texas InstrumentsIn Stock: 2099SN74ABT2240ANSR Datasheet

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SN74ABT240ADWR

Texas InstrumentsIn Stock: 12587SN74ABT240ADWR Datasheet

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SN74ABT240ANSR

Texas InstrumentsIn Stock: 16174SN74ABT240ANSR Datasheet

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SN74ABT240ADW

Texas InstrumentsIn Stock: 2540SN74ABT240ADW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ABT240CSC are grouped based on the following critical parameters that determine functional and mechanical compatibility:

Primary Substitution Criteria:

• Logic Type: Buffer, Inverting (must match)
• Number of Elements: 2 (must match)
• Number of Bits per Element: 4 (must match)
• Output Type: 3-State (must match)
• Voltage - Supply: 4.5V ~ 5.5V (must match)
• Operating Temperature: -40°C ~ 85°C (TA) (must match)
• Package / Case: 20-SOIC or 20-SO (mechanically compatible)
• Series: 74ABT (same logic family)

Secondary Consideration:

• Current - Output High, Low: Substitutes with 32mA/64mA are direct equivalents; substitutes with 32mA/12mA are functionally compatible but with reduced low-side output current

Substitutes are available from Texas Instruments in active product status, offering improved availability and RoHS3 compliance compared to the obsolete onsemi part.

Parameter Comparison

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended Primary Substitutes):

SN74ABT240ADWR, SN74ABT240ANSR, and SN74ABT240ADW are direct parametric equivalents to the 74ABT240CSC. These parts maintain identical output current specifications (32mA/64mA) and are manufactured by Texas Instruments with active product status and ROHS3 compliance. Selection between these three should be based on packaging requirements: SN74ABT240ADWR and SN74ABT240ADW use the standard 20-SOIC package (0.295" width), while SN74ABT240ANSR uses the narrower 20-SO package (0.209" width).

Functional Equivalents (Secondary Substitutes):

SN74ABT2240ADWR, SN74ABT2240ADW, and SN74ABT2240ANSR are functionally equivalent but feature reduced low-side output current (12mA versus 64mA). These parts are suitable for applications where the lower output current specification does not impact circuit performance. All three maintain active product status and ROHS3 compliance.

Packaging Considerations:

Parts designated with "ANSR" suffix use the 20-SO package (0.209" width), which is narrower than the standard 20-SOIC package (0.295" width). PCB layout compatibility must be verified before substitution. All other listed substitutes use the standard 20-SOIC package matching the original 74ABT240CSC footprint.

Frequently Asked Questions (FAQ)

Q: Can I use SN74ABT2240 series parts as direct replacements for 74ABT240CSC?

A: SN74ABT2240 series parts are functionally compatible but feature reduced low-side output current (12mA versus 64mA). They are suitable substitutes only if your circuit design does not require the full 64mA output current specification. Verify your application requirements before substitution.

Q: What is the difference between 20-SOIC and 20-SO packages?

A: Both are 20-pin surface-mount packages, but 20-SO (0.209" width) is narrower than 20-SOIC (0.295" width). PCB footprints are not interchangeable. Confirm your board layout supports the selected package before ordering.

Q: Why is the 74ABT240CSC listed as obsolete?

A: The 74ABT240CSC is an older onsemi product. Texas Instruments offers active, in-production equivalents (SN74ABT240 series) that provide improved availability, compliance certifications, and supply chain stability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All Texas Instruments substitute parts listed (SN74ABT240 and SN74ABT2240 series) are ROHS3 compliant. The original 74ABT240CSC RoHS status is not specified in available documentation.

Q: Which substitute should I select for new designs?

A: For new designs, select SN74ABT240ADWR or SN74ABT240ADW (both active status, ROHS3 compliant, matching output current specifications). Choose based on packaging preference: SN74ABT240ADWR for tape & reel packaging or SN74ABT240ADW for tube packaging.

Q: Can I mix different substitute part numbers in the same design?

A: Yes, all listed substitutes are electrically and functionally compatible within the specified parameters. However, maintain consistent part sourcing and packaging within production batches to ensure supply chain consistency.