PI74FCT2541ATSEX Equivalent & Substitute Parts

Part Overview

The PI74FCT2541ATSEX is a non-inverting buffer logic integrated circuit manufactured by Diodes Incorporated, designed for 3-state output applications in 20-SOIC surface mount packaging. This device operates within a 4.75V to 5.25V supply voltage range and is rated for -40°C to 85°C operating temperature. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and component sourcing.

Key Parameters

Parameter	Value
Logic Type	Buffer, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
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 for the PI74FCT2541ATSEX is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Logic Type: Buffer, Non-Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Voltage - Supply: 4.75V ~ 5.25V
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Operating Temperature Range (must encompass or match -40°C ~ 85°C)
Output Current Specifications (High and Low)
RoHS and MSL Compliance Status
Packaging Format (Tube or Tape & Reel)

Substitute parts are grouped into two categories based on output current drive capability: parts with 15mA/64mA output current (matching the original specification) and parts with 32mA/64mA output current (higher drive capability, functionally compatible for most applications).

Parameter Comparison

Part Number	Manufacturer	Base Product	Current - Output High, Low (mA)	Operating Temperature (°C)	Product Status	Packaging	Inventory (Pcs)
PI74FCT2541ATSEX	Diodes Incorporated	74FCT2541	15, 64	-40 ~ 85	Obsolete	-	1046
CD74FCT541M	Texas Instruments	74FCT541	15, 64	0 ~ 70	Active	Tube	1366
CY74FCT2541ATSOC	Texas Instruments	74FCT2541	15, 12	-40 ~ 85	Active	Tube	1431
CY74FCT2541CTSOC	Texas Instruments	74FCT2541	15, 12	-40 ~ 85	Active	Tube	1258
CY74FCT2541TSOC	Texas Instruments	74FCT2541	15, 12	-40 ~ 85	Active	Tube	2457
CY74FCT2541TSOCT	Texas Instruments	74FCT2541	15, 12	-40 ~ 85	Active	Tape & Reel (TR)	865
CY74FCT541ATSOC	Texas Instruments	74FCT541	32, 64	-40 ~ 85	Active	Tube	1635
CY74FCT541ATSOCT	Texas Instruments	74FCT541	32, 64	-40 ~ 85	Active	Tape & Reel (TR)	2200
CY74FCT541CTSOC	Texas Instruments	74FCT541	32, 64	-40 ~ 85	Active	Tube	2200
CY74FCT541CTSOCT	Texas Instruments	74FCT541	32, 64	-40 ~ 85	Active	Tape & Reel (TR)	868
CY74FCT541TSOC	Texas Instruments	74FCT541	32, 64	-40 ~ 85	Active	Tube	1837

Engineering Selection Recommendations

Direct Substitutes (Identical Output Current Specification):

CY74FCT2541ATSOC, CY74FCT2541CTSOC, CY74FCT2541TSOC, and CY74FCT2541TSOCT are direct functional equivalents with matching 15mA/64mA output current specifications and identical -40°C to 85°C operating temperature range. These parts share the same base product number (74FCT2541) and are manufactured by Texas Instruments with Active product status. Selection between tube and tape & reel packaging depends on production volume and assembly requirements.

Compatible Substitutes (Higher Output Current):

CY74FCT541ATSOC, CY74FCT541ATSOCT, CY74FCT541CTSOC, CY74FCT541CTSOCT, and CY74FCT541TSOC provide 32mA/64mA output current capability, representing increased drive strength. These parts use the base product number 74FCT541 and maintain the -40°C to 85°C operating temperature range. Higher output current provides enhanced signal integrity and reduced propagation delay in applications with higher capacitive loads.

Limited Temperature Range Substitute:

CD74FCT541M operates within a 0°C to 70°C temperature range, narrower than the original -40°C to 85°C specification. This part is suitable only for applications where the reduced temperature range is acceptable. It maintains the 15mA/64mA output current specification and is supplied in tube packaging.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and identical 20-SOIC package geometry, ensuring mechanical and electrical compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT541ATSOC replace PI74FCT2541ATSEX directly?

A: CY74FCT541ATSOC is functionally compatible but uses a different base product number (74FCT541 vs. 74FCT2541). The primary difference is higher output current capability (32mA vs. 15mA on the high output). This provides enhanced drive strength and is compatible with designs originally specified for PI74FCT2541ATSEX. Verify that your circuit does not depend on the lower output current specification.

Q: What is the difference between tube and tape & reel packaging?

A: Tube packaging is suitable for lower-volume production and manual assembly. Tape & reel packaging is designed for automated pick-and-place assembly equipment and is standard for high-volume manufacturing. Both formats contain identical components; selection depends on production methodology and volume requirements.

Q: Why does CD74FCT541M have a narrower operating temperature range?

A: CD74FCT541M is specified for 0°C to 70°C operation, compared to the original -40°C to 85°C range. This part is suitable only for applications operating within this narrower temperature window. For designs requiring full -40°C to 85°C operation, select from the CY74FCT2541 or CY74FCT541 series.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 rating, matching the original PI74FCT2541ATSEX specifications. This ensures compatibility with modern manufacturing standards and environmental regulations.

Q: What does the output current difference (15mA vs. 32mA) mean for my application?

A: Output current specification defines the maximum current the device can source (high output) or sink (low output) while maintaining valid logic levels. Higher output current (32mA) provides greater drive capability for capacitive loads and longer trace lengths, reducing propagation delay. For most standard logic applications, both specifications are functionally equivalent. Consult your circuit schematic to confirm current requirements.

Q: Can I mix different substitute parts in the same design?

A: Yes. All listed substitute parts are pin-compatible and functionally equivalent within their specified operating parameters. However, for consistency and simplified inventory management, standardizing on a single part number is recommended.

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