CY74FCT240CTQCT Equivalent & Substitute Parts

Part Overview

The CY74FCT240CTQCT is a Buffer, Inverting logic integrated circuit manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This device operates within the 74FCT logic series and is housed in a 20-SSOP package. The main part is currently listed as obsolete, making equivalent and substitute parts essential for ongoing system support and new design implementations where this functionality is required.

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	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
Series	74FCT

Substitute Part Grouping Explanation

Substitution for the CY74FCT240CTQCT is determined by strict equivalence across the following critical 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
Series: 74FCT

All identified substitute parts maintain these core electrical and mechanical specifications. Variations in packaging format (Tape & Reel, Bulk, Tube), product status (Active vs. Obsolete), and output current ratings are noted but do not preclude functional equivalence within the specified parameter set.

Parameter Comparison

Parameter	CY74FCT240CTQCT (Main)	CY74FCT240ATQCT	CY74FCT240TQCT	74FCT240CTQG
Manufacturer	Texas Instruments	Texas Instruments	Cypress Semiconductor Corp	Renesas Electronics Corporation
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	20-SSOP	20-SSOP/QSOP	20-QSOP
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
Packaging Format	Not specified	Tape & Reel (TR)	Bulk	Tube

Engineering Selection Recommendations

CY74FCT240ATQCT is the primary recommended substitute. This part is manufactured by Texas Instruments, maintains full electrical and mechanical equivalence to the main part, carries Active product status, and is ROHS3 compliant. It is available in Tape & Reel packaging format with 5626 units in stock.

CY74FCT240TQCT is a secondary equivalent manufactured by Cypress Semiconductor Corp. This part maintains all critical electrical parameters and operating specifications. It carries Active product status and is available in Bulk packaging with 4133 units in stock. RoHS compliance status is not specified in the provided data.

74FCT240CTQG is a manufacturer-recommended alternative from Renesas Electronics Corporation. This part maintains voltage supply and operating temperature specifications but features reduced output high current (15mA vs. 32mA). Both the main part and this substitute are listed as Obsolete. This part is ROHS3 compliant and available in Tube packaging with 1817 units in stock.

Selection should prioritize active product status and full current output specifications for new designs. For legacy system maintenance where the original part is no longer available, any of the three substitutes provide functional equivalence within the specified parameter constraints.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT240ATQCT directly replace CY74FCT240CTQCT in existing designs?

A: Yes. Both parts are electrically and mechanically equivalent across all critical parameters: logic type, element count, bit configuration, output type, supply voltage range, operating temperature range, and package specification. The primary difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. unspecified).

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 main part and other substitutes. This reduced current capability must be evaluated against the specific load requirements of the application. If the circuit requires the full 32mA output high current, this part may not be suitable.

Q: Are there packaging compatibility concerns between these substitutes?

A: All parts use the same 20-SSOP/QSOP package footprint (0.154", 3.90mm Width) and surface mount mounting type. Packaging format differences (Tape & Reel, Bulk, Tube) refer to supply format only and do not affect PCB compatibility or electrical performance.

Q: Which substitute offers the best long-term availability?

A: CY74FCT240ATQCT carries Active product status and is manufactured by Texas Instruments, the original manufacturer of the main part. This typically indicates better long-term availability and supply continuity compared to obsolete alternatives.

Q: Are all substitutes RoHS compliant?

A: CY74FCT240ATQCT and 74FCT240CTQG are both ROHS3 compliant. RoHS compliance status for CY74FCT240TQCT is not specified in the provided data and should be confirmed with the supplier if RoHS compliance is a design requirement.

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