PI74FCT2541ATQ Equivalent & Substitute Parts

Part Overview

The PI74FCT2541ATQ is an inverting buffer logic IC manufactured by Diodes Incorporated, designed for 5.25V operation with 3-state output capability. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The 74FCT series provides high-speed CMOS logic buffering suitable for bus interface and signal conditioning applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT2541ATQ
Manufacturer	Diodes Incorporated
Logic Type	Buffer, 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-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the PI74FCT2541ATQ is determined by the following critical parameters:

Electrical Compatibility Requirements:

Supply voltage range: 4.75V ~ 5.25V (must match)
Output type: 3-State (must match)
Number of elements: 1 (must match)
Number of bits per element: 8 (must match)
Operating temperature range: -40°C ~ 85°C (must match)
Package / Case: 20-SSOP form factor (must match)

Functional Consideration: The PI74FCT2541ATQ is an inverting buffer. Substitute parts may include both inverting (74FCT2541 series) and non-inverting (74FCT541 series) buffer configurations, as logic inversion can be accommodated through circuit design modifications when necessary.

Compliance Status: Active product status and RoHS3 compliance are preferred for new designs, though not mandatory for direct electrical substitution.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Output Current (High/Low)	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
PI74FCT2541ATQ	Diodes Incorporated	Buffer, Inverting	15mA / 64mA	4.75V ~ 5.25V	-40°C ~ 85°C	20-SSOP	Obsolete	RoHS non-compliant
CY74FCT2541ATQCT	Texas Instruments	Buffer, Non-Inverting	15mA / 12mA	4.75V ~ 5.25V	-40°C ~ 85°C	20-SSOP	Active	ROHS3 Compliant
CY74FCT2541CTQCT	Texas Instruments	Buffer, Non-Inverting	15mA / 12mA	4.75V ~ 5.25V	-40°C ~ 85°C	20-SSOP	Active	ROHS3 Compliant
CY74FCT2541TQCT	Texas Instruments	Buffer, Non-Inverting	15mA / 12mA	4.75V ~ 5.25V	-40°C ~ 85°C	20-SSOP	Active	ROHS3 Compliant
CY74FCT541ATQCT	Texas Instruments	Buffer, Non-Inverting	32mA / 64mA	4.75V ~ 5.25V	-40°C ~ 85°C	20-SSOP	Active	ROHS3 Compliant
CY74FCT541CTQCT	Texas Instruments	Buffer, Non-Inverting	32mA / 64mA	4.75V ~ 5.25V	-40°C ~ 85°C	20-SSOP	Active	ROHS3 Compliant
CY74FCT541TQCT	Texas Instruments	Buffer, Non-Inverting	32mA / 64mA	4.75V ~ 5.25V	-40°C ~ 85°C	20-SSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (CY74FCT2541 Series): CY74FCT2541ATQCT, CY74FCT2541CTQCT, and CY74FCT2541TQCT are functionally equivalent to the PI74FCT2541ATQ with matching output current specifications (15mA / 12mA). These parts are manufactured by Texas Instruments, carry active product status, and meet ROHS3 compliance requirements. Selection among these three variants depends on packaging format preference: Tape & Reel (ATQCT, CTQCT) or Cut Tape & Digi-Reel (TQCT).

Secondary Substitutes (CY74FCT541 Series): CY74FCT541ATQCT, CY74FCT541CTQCT, and CY74FCT541TQCT provide higher output current capability (32mA / 64mA) and are suitable for applications requiring increased drive strength. These parts maintain electrical compatibility across supply voltage, operating temperature, and package form factor. The non-inverting logic type requires circuit-level accommodation if inversion is functionally required.

Compliance Consideration: All Texas Instruments substitutes are ROHS3 compliant and carry active product status, providing long-term availability and regulatory alignment compared to the obsolete, non-compliant PI74FCT2541ATQ.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT2541 and CY74FCT541 parts be used interchangeably with the PI74FCT2541ATQ?

A: Both series are electrically compatible within the specified parameters (supply voltage, operating temperature, package, 3-state output). The primary difference is logic function: CY74FCT2541 is non-inverting while PI74FCT2541ATQ is inverting. Circuit design must accommodate this functional difference.

Q: What is the difference between CY74FCT2541ATQCT, CY74FCT2541CTQCT, and CY74FCT2541TQCT?

A: These part numbers differ only in packaging format. ATQCT and CTQCT are supplied in Tape & Reel format, while TQCT is supplied in Cut Tape & Digi-Reel format. Electrical specifications and performance are identical.

Q: Does the output current difference between CY74FCT2541 (15mA / 12mA) and CY74FCT541 (32mA / 64mA) affect substitution?

A: Higher output current in the CY74FCT541 series provides greater drive capability and is suitable for applications with higher load requirements. The CY74FCT2541 series matches the original PI74FCT2541ATQ output current specification more closely.

Q: Are all substitute parts available in the same 20-SSOP package?

A: Yes. All listed substitute parts use the 20-SSOP (0.154", 3.90mm Width) package, ensuring mechanical and electrical compatibility with existing PCB designs.

Q: What is the significance of RoHS3 compliance for these substitutes?

A: RoHS3 compliance indicates conformance to current environmental and hazardous substance restrictions. The original PI74FCT2541ATQ is RoHS non-compliant, while all Texas Instruments substitutes are ROHS3 compliant, supporting regulatory requirements for new designs and procurement.

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