74FCT240ATSOG Equivalent & Substitute Parts

Part Overview

The 74FCT240ATSOG is an inverting buffer logic IC manufactured by Renesas Electronics Corporation, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-SOIC package. This part is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity. The 74FCT240 series maintains consistent functional specifications across manufacturers and packaging options, enabling direct substitution based on electrical and mechanical parameter alignment.

Key Parameters

Parameter	Value
Logic Type	Buffer, Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	15mA, 64mA
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74FCT240ATSOG is determined by strict alignment of the following electrical and mechanical parameters:

Logic function: Buffer, Inverting with 2 elements, 4 bits per element, 3-state output
Supply voltage range: 4.75V ~ 5.25V
Operating temperature range: -40°C ~ 85°C (TA)
Package type: 20-SOIC with identical physical dimensions (0.295", 7.50mm Width)
Surface mount configuration
RoHS3 compliance and MSL Level 1 rating

All identified substitute parts maintain these core parameters. Variations in output current specifications (32mA vs. 15mA for output high) and packaging format (Tube vs. Tape & Reel) do not affect functional substitutability within the 74FCT240 series. The primary distinction between substitute options is product status (active vs. obsolete) and packaging delivery format.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Current - Output High, Low	Voltage - Supply	Operating Temperature	Package / Case	RoHS Status
74FCT240ATSOG	Renesas Electronics Corporation	Obsolete	-	15mA, 64mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-SOIC (0.295", 7.50mm Width)	ROHS3 Compliant
74FCT240ACTSOG	Renesas Electronics Corporation	Active	-	Not specified	Not specified	Not specified	20-SOIC (0.295", 7.50mm Width)	ROHS3 Compliant
CY74FCT240ATSOC	Texas Instruments	Active	Tube	32mA, 64mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-SOIC (0.295", 7.50mm Width)	ROHS3 Compliant
CY74FCT240ATSOCT	Texas Instruments	Active	Tape & Reel (TR)	32mA, 64mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-SOIC (0.295", 7.50mm Width)	ROHS3 Compliant
CY74FCT240TSOC	Texas Instruments	Active	Tube	32mA, 64mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-SOIC (0.295", 7.50mm Width)	ROHS3 Compliant
CY74FCT240TSOCT	Texas Instruments	Active	Tape & Reel (TR)	32mA, 64mA	4.75V ~ 5.25V	-40°C ~ 85°C (TA)	20-SOIC (0.295", 7.50mm Width)	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the obsolete 74FCT240ATSOG, the following selection criteria apply:

Active Renesas Alternative: The 74FCT240ACTSOG maintains manufacturer continuity with active product status and identical packaging specifications. This option is preferred for designs requiring single-source qualification or existing Renesas component ecosystems.

Texas Instruments Alternatives: The CY74FCT240 series (ATSOC, ATSOCT, TSOC, TSOCT variants) from Texas Instruments provides active, in-stock alternatives with full electrical parameter compatibility. These parts are available in both Tube and Tape & Reel packaging formats to accommodate different procurement and assembly workflows. Output current specifications (32mA vs. 15mA for output high) represent an improvement over the original part and do not restrict substitutability.

All substitute options maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard PCB assembly and storage protocols. Selection between Tube and Tape & Reel packaging should be based on production volume and assembly line requirements rather than functional considerations.

Frequently Asked Questions (FAQ)

Q: Can the CY74FCT240 series from Texas Instruments directly replace the 74FCT240ATSOG?

A: Yes. The CY74FCT240 variants (ATSOC, ATSOCT, TSOC, TSOCT) are direct functional equivalents. All maintain identical logic configuration (2 elements, 4 bits per element, 3-state output), supply voltage range (4.75V ~ 5.25V), operating temperature range (-40°C ~ 85°C), and 20-SOIC package dimensions. The higher output current specification (32mA vs. 15mA) in Texas Instruments parts represents improved performance and does not affect compatibility.

Q: What is the difference between Tube and Tape & Reel packaging options?

A: Tube packaging (ATSOC, TSOC) is suitable for lower-volume applications and manual assembly processes. Tape & Reel packaging (ATSOCT, TSOCT) is designed for high-volume automated assembly lines. Both packaging formats contain identical die and electrical specifications; the choice depends on production methodology and volume requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts, including 74FCT240ACTSOG and all CY74FCT240 variants, are ROHS3 compliant with MSL Level 1 rating. This ensures compatibility with modern PCB assembly standards and storage requirements.

Q: Why is the 74FCT240ATSOG classified as obsolete?

A: Obsolete status indicates that Renesas Electronics Corporation has discontinued active production and support for this specific part number. Active alternatives from both Renesas (74FCT240ACTSOG) and Texas Instruments (CY74FCT240 series) are available to ensure design continuity and supply chain stability.

Q: Can I use 74FCT240ACTSOG as a direct replacement?

A: Yes. The 74FCT240ACTSOG is an active Renesas part with identical functional specifications and 20-SOIC packaging. It is the preferred choice for designs requiring manufacturer continuity with the original Renesas source.

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