CY74FCT240CTQCTG4 Equivalent & Substitute Parts

Part Overview

The CY74FCT240CTQCTG4 is a Buffer, Inverting logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This component operates at 5.25V supply voltage and is housed in a 20-SSOP package. The part is currently classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	CY74FCT240CTQCTG4
Manufacturer	Texas Instruments
Series	74FCT
Logic Type	Buffer, Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	32mA, 64mA
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)

Substitute Part Grouping Explanation

Substitute parts for the CY74FCT240CTQCTG4 are identified based on strict electrical and mechanical parameter matching within the 74FCT logic family. The following criteria determine substitutability:

Critical Matching Parameters:

Logic Type: Buffer, Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Voltage - Supply: 4.75V ~ 5.25V
Operating Temperature: -40°C ~ 85°C (TA)
Package / Case: 20-SSOP (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Acceptable Variations:

Manufacturer (Texas Instruments, Cypress Semiconductor Corp, Renesas Electronics Corporation)
Packaging format (Tape & Reel, Bulk, Tube)
Product Status (Active or Obsolete)
Current - Output High: 15mA to 32mA
Moisture Sensitivity Level: 1 or 2

All identified substitutes maintain full electrical and mechanical compatibility with the original part specification.

Parameter Comparison

Parameter	CY74FCT240CTQCTG4	CY74FCT240ATQCT	CY74FCT240TQCT	74FCT240CTQG
Manufacturer	Texas Instruments	Texas Instruments	Cypress Semiconductor Corp	Renesas Electronics Corporation
Series	74FCT	74FCT	74FCT	74FCT
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting
Number of Elements	2	2	2	2
Number of Bits per Element	4	4	4	4
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	32mA, 64mA	32mA, 64mA	32mA, 64mA	15mA, 64mA
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	2 (1 Year)	Not specified	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute: CY74FCT240ATQCT

This part is the preferred substitute for the CY74FCT240CTQCTG4. It maintains identical electrical specifications and package configuration while offering active product status. The CY74FCT240ATQCT is available in Tape & Reel packaging and carries ROHS3 compliance with MSL 2 rating, matching the original part's environmental specifications.

Secondary Substitute: CY74FCT240TQCT

This Cypress Semiconductor Corp alternative provides full electrical and mechanical compatibility. Available in Bulk packaging with active product status, it serves as a viable option when Tape & Reel format is not required. Compliance certifications are not specified for this variant.

Alternative Substitute: 74FCT240CTQG

This Renesas Electronics Corporation part maintains electrical compatibility with a reduced output high current specification (15mA versus 32mA). It is suitable for applications where the lower output current is acceptable. This part carries MSL 1 rating, indicating superior moisture resistance compared to the original specification.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT240ATQCT be used as a direct replacement for CY74FCT240CTQCTG4?

A: Yes. Both parts share identical electrical parameters, package configuration, and operating specifications. The primary difference is product status (Active versus Obsolete) and packaging format (Tape & Reel versus unspecified). Electrical performance and pinout are equivalent.

Q: What is the significance of the output current difference in 74FCT240CTQG?

A: The 74FCT240CTQG provides 15mA output high current compared to 32mA in the original part. This reduction is acceptable for applications with lower current drive requirements. Systems requiring the full 32mA output capability should use CY74FCT240ATQCT or CY74FCT240TQCT instead.

Q: Are all substitutes compatible with the same PCB footprint?

A: Yes. All substitute parts use the 20-SSOP package with identical dimensions (0.154", 3.90mm Width). Surface mount placement and soldering procedures remain unchanged.

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

A: Tape & Reel packaging is suitable for automated assembly processes, while Bulk packaging is typically used for manual assembly or lower-volume applications. Electrical specifications and component performance are identical regardless of packaging format.

Q: Why is the original part classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Active alternatives such as CY74FCT240ATQCT are recommended for new designs and ongoing procurement to ensure long-term availability.

Q: Does MSL rating affect component substitutability?

A: MSL rating indicates moisture sensitivity during storage and handling. The original part (MSL 2, 1 Year) and CY74FCT240ATQCT (MSL 2, 1 Year) have identical ratings. The 74FCT240CTQG (MSL 1, Unlimited) offers superior moisture resistance and may be preferred in high-humidity environments.

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