PI74FCT240ATS Equivalent & Substitute Parts

Part Overview

The PI74FCT240ATS is an inverting buffer logic IC manufactured by Diodes Incorporated, 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 equivalent and substitute parts necessary for ongoing design support and procurement.

The 74FCT240 series provides buffering and signal inversion functions suitable for logic-level applications requiring 3-state output control. Substitutes must maintain functional compatibility through matching logic type, element configuration, output characteristics, and electrical specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT240ATS
Manufacturer	Diodes Incorporated
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)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the PI74FCT240ATS is determined by the following critical parameters:

Logic Type: Buffer, Inverting (mandatory match)
Number of Elements: 2 (mandatory match)
Number of Bits per Element: 4 (mandatory match)
Output Type: 3-State (mandatory match)
Voltage - Supply: 4.75V ~ 5.25V (mandatory match)
Operating Temperature: -40°C ~ 85°C (mandatory match)
Package / Case: 20-SOIC (mandatory match)
Current - Output High, Low: Must meet or exceed 15mA, 64mA

All substitute parts listed below are manufactured by Texas Instruments under the 74FCT240 base product number and maintain active product status. Substitutes are available in two packaging formats: Tube and Tape & Reel (TR).

Parameter Comparison

Parameter	PI74FCT240ATS (Main)	CY74FCT240ATSOC	CY74FCT240ATSOCT	CY74FCT240TSOC	CY74FCT240TSOCT	CY74FCT244ATSOC
Manufacturer	Diodes Incorporated	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Non-Inverting
Number of Elements	2	2	2	2	2	2
Number of Bits per Element	4	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	15mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Packaging Format	Not specified	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tube
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory (Pcs)	890	2706	3400	1716	2900	1185

Engineering Selection Recommendations

Primary Substitutes (Inverting Logic Type - Recommended)

The CY74FCT240ATSOC, CY74FCT240ATSOCT, CY74FCT240TSOC, and CY74FCT240TSOCT parts are direct functional equivalents manufactured by Texas Instruments. All four maintain the inverting buffer logic type, identical element and bit configuration, and matching electrical specifications. These parts are in active production status with ROHS3 compliance, providing long-term availability and regulatory alignment.

Selection between these four parts depends on packaging format requirements:

Tube packaging: CY74FCT240ATSOC or CY74FCT240TSOC
Tape & Reel (TR) packaging: CY74FCT240ATSOCT or CY74FCT240TSOCT

Output current capability is enhanced in all Texas Instruments substitutes (32mA high vs. 15mA in the original), providing improved drive capability while maintaining full backward compatibility.

Alternative Substitute (Non-Inverting Logic Type)

The CY74FCT244ATSOC is a non-inverting buffer variant. This part matches all mechanical, thermal, and electrical specifications except for logic polarity. Selection of this part requires circuit-level verification that non-inverting logic is functionally acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT240ATSOC directly replace PI74FCT240ATS?

A: Yes. The CY74FCT240ATSOC maintains identical logic type (inverting), element count (2), bit configuration (4 per element), output type (3-state), supply voltage range (4.75V ~ 5.25V), operating temperature range (-40°C ~ 85°C), and 20-SOIC package. Output current capability is enhanced (32mA vs. 15mA high), which is a functional improvement. Pin-for-pin compatibility is maintained.

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

A: Tube packaging (CY74FCT240ATSOC, CY74FCT240TSOC) is suitable for manual handling and smaller quantity orders. Tape & Reel packaging (CY74FCT240ATSOCT, CY74FCT240TSOCT) is optimized for automated assembly processes and high-volume production. Electrical and functional specifications are identical between packaging formats.

Q: Why is CY74FCT244ATSOC listed as a substitute if it is non-inverting?

A: The CY74FCT244ATSOC is listed as an alternative substitute because it matches all mechanical, thermal, and electrical parameters. However, its non-inverting logic type represents a functional difference. This part is suitable only if circuit design permits non-inverting buffer operation.

Q: Are all Texas Instruments substitutes ROHS3 compliant?

A: Yes. All CY74FCT240 and CY74FCT244 variants listed are ROHS3 compliant, whereas the original PI74FCT240ATS is RoHS non-compliant. This compliance status supports regulatory requirements for new designs and procurement.

Q: What is the inventory status for these substitutes?

A: All Texas Instruments substitutes maintain active production status with substantial inventory availability. CY74FCT240ATSOCT has the highest inventory (3400 pcs), followed by CY74FCT240TSOCT (2900 pcs) and CY74FCT240ATSOC (2706 pcs).

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