PI74FCT244TSEX Equivalent & Substitute Parts

Part Overview

The PI74FCT244TSEX is a non-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 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74FCT244 series provides buffering functionality suitable for digital logic applications requiring controlled output impedance and tri-state control.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT244TSEX
Manufacturer	Diodes Incorporated
Logic Type	Buffer, Non-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
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the PI74FCT244TSEX is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Logic type: Buffer, Non-Inverting
Number of elements: 2
Number of bits per element: 4
Output type: 3-State
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Voltage supply range: 4.75V ~ 5.25V
Mounting type: Surface Mount

Secondary Compatibility Factors:

Current output specifications (High and Low)
Operating temperature range
Product status and compliance certifications

Substitute parts are grouped into two categories based on output current specifications and operating temperature ranges. Parts with identical output current ratings (15mA High, 64mA Low) and extended temperature range (-40°C ~ 85°C) provide direct functional equivalence. Parts with different output current specifications or reduced temperature ranges (0°C ~ 70°C) remain compatible but with noted parameter variations.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current High/Low (mA)	Supply Voltage	Temp Range (°C)	Package	Status	RoHS
PI74FCT244TSEX	Diodes Incorporated	Buffer, Non-Inverting	2	4	3-State	15/64	4.75-5.25V	-40 to 85	20-SOIC	Obsolete	ROHS3
74FCT244ATSOG	IDT	Buffer, Non-Inverting	2	4	3-State	15/64	4.75-5.25V	-40 to 85	20-SOIC	Active	Not specified
74FCT244CTSOG	IDT	Buffer, Non-Inverting	2	4	3-State	15/64	4.75-5.25V	-40 to 85	20-SOIC	Active	Not specified
CD74FCT244ATM	Harris Corporation	Buffer, Non-Inverting	2	4	3-State	15/64	4.75-5.25V	0 to 70	20-SOIC	Obsolete	Non-compliant
CD74FCT244ATM96	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15/64	4.75-5.25V	0 to 70	20-SOIC	Active	ROHS3
CD74FCT244M	Harris Corporation	Buffer, Non-Inverting	2	4	3-State	15/64	4.75-5.25V	0 to 70	20-SOIC	Obsolete	Non-compliant
CD74FCT244M96	Harris Corporation	Buffer, Non-Inverting	2	4	3-State	15/64	4.75-5.25V	0 to 70	20-SOIC	Obsolete	Non-compliant
CY74FCT2244ATSOC	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15/12	4.75-5.25V	-40 to 85	20-SOIC	Active	ROHS3
CY74FCT2244CTSOC	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15/12	4.75-5.25V	-40 to 85	20-SOIC	Active	ROHS3
CY74FCT2244TSOC	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	15/12	4.75-5.25V	-40 to 85	20-SOIC	Active	ROHS3
CY74FCT244ATSOC	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	32/64	4.75-5.25V	-40 to 85	20-SOIC	Active	ROHS3

Engineering Selection Recommendations

Preferred Substitutes (Direct Equivalence):

The 74FCT244ATSOG and 74FCT244CTSOG from IDT are active products with identical electrical specifications to the PI74FCT244TSEX, including matching output current ratings (15mA High, 64mA Low) and extended operating temperature range (-40°C ~ 85°C). Both parts are available in active production status, ensuring long-term procurement availability.

Compatible Substitutes (Temperature Range Variation):

The CD74FCT244ATM96 from Texas Instruments is an active product with ROHS3 compliance and identical output current specifications. However, its operating temperature range is limited to 0°C ~ 70°C, which is narrower than the original part's -40°C ~ 85°C range. This part is suitable for applications not requiring extended low-temperature operation.

Limited Compatibility (Output Current Variation):

The CY74FCT2244ATSOC, CY74FCT2244CTSOC, and CY74FCT2244TSOC from Texas Instruments feature reduced output low current (12mA versus 64mA) while maintaining the extended temperature range (-40°C ~ 85°C) and ROHS3 compliance. These parts are compatible for applications with lower output current requirements.

The CY74FCT244ATSOC from Texas Instruments provides increased output high current (32mA versus 15mA) with extended temperature range and ROHS3 compliance, suitable for applications requiring higher drive capability.

Obsolete Alternatives (Not Recommended for New Designs):

The CD74FCT244ATM, CD74FCT244M, and CD74FCT244M96 from Harris Corporation are obsolete products with RoHS non-compliance. These parts should not be selected for new designs despite available inventory.

Frequently Asked Questions (FAQ)

Q: Can the 74FCT244ATSOG directly replace the PI74FCT244TSEX?

A: Yes. The 74FCT244ATSOG from IDT provides direct functional equivalence with identical output current specifications (15mA High, 64mA Low), matching supply voltage range (4.75V ~ 5.25V), extended operating temperature range (-40°C ~ 85°C), and identical 20-SOIC package. The part is in active production status.

Q: What is the difference between the CY74FCT2244 and CY74FCT244 series?

A: The CY74FCT2244 series (CY74FCT2244ATSOC, CY74FCT2244CTSOC, CY74FCT2244TSOC) features reduced output low current specification (12mA) compared to the standard 74FCT244 series (64mA). Both maintain identical element count, bit configuration, and 3-state output functionality. Selection depends on application current requirements.

Q: Are there temperature range limitations with any substitutes?

A: Yes. The CD74FCT244ATM96, CD74FCT244ATM, CD74FCT244M, and CD74FCT244M96 operate within 0°C ~ 70°C, which is narrower than the original PI74FCT244TSEX range of -40°C ~ 85°C. These parts are unsuitable for applications requiring extended low-temperature operation below 0°C.

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

A: The 74FCT244ATSOG and 74FCT244CTSOG from IDT are active products with no known end-of-life announcements, providing the most reliable long-term procurement continuity. Both parts maintain full electrical equivalence to the original PI74FCT244TSEX.

Q: Is RoHS compliance a factor in substitute selection?

A: Yes. The PI74FCT244TSEX is ROHS3 compliant. The 74FCT244ATSOG and 74FCT244CTSOG from IDT do not specify RoHS status in available documentation. The CD74FCT244ATM96 from Texas Instruments is ROHS3 compliant. The CD74FCT244ATM, CD74FCT244M, and CD74FCT244M96 are RoHS non-compliant and unsuitable for applications with RoHS requirements.

Q: Can the CY74FCT244ATSOC with 32mA output high current be used in place of the original part?

A: Yes, for applications where increased output high current (32mA versus 15mA) is acceptable or beneficial. The part maintains all other specifications including extended temperature range (-40°C ~ 85°C), ROHS3 compliance, and 3-state output functionality. Verify that the application circuit can accommodate the higher output current without adverse effects.

Q: What packaging options are available for substitutes?

A: All substitute parts listed are available in the 20-SOIC (0.295", 7.50mm Width) surface mount package, matching the original PI74FCT244TSEX package specification. Packaging variations (Bulk, Tube, Tape & Reel) are available from different manufacturers but do not affect electrical compatibility.

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