PI74FCT541TQE Equivalent & Substitute Parts

Part Overview

The PI74FCT541TQE is a non-inverting buffer logic IC manufactured by Diodes Incorporated, designed for 8-bit buffering applications with 3-state output capability. This device operates within the 74FCT logic family and is packaged in a 20-QSOP surface mount configuration. The part is currently classified as obsolete, making identification of functionally equivalent active alternatives necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT541TQE
Manufacturer	Diodes Incorporated
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-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PI74FCT541TQE is determined by the following critical parameters:

Primary Substitution Criteria:

Logic Type: Buffer, Non-Inverting (functional equivalence)
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Voltage - Supply: 4.75V ~ 5.25V (identical operating range)
Operating Temperature: -40°C ~ 85°C (TA)
Package / Case: 20-SSOP (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Current - Output High, Low: Must meet or exceed 15mA (high) and 64mA (low)
RoHS Status: ROHS3 Compliant
Series: 74FCT logic family

Substitute parts are grouped into two categories based on output current specifications:

Group 1 - Direct Current Match (15mA High, 12mA Low): CY74FCT2541ATQCT, CY74FCT2541CTQCT, CY74FCT2541TQCT

Group 2 - Enhanced Current Capability (32mA High, 64mA Low): CY74FCT541ATQCT, CY74FCT541CTQCT, CY74FCT541TQCT

Non-Equivalent Part: CY74FCT540CTQCT is an inverting buffer and does not meet the non-inverting logic type requirement.

Parameter Comparison

Parameter	PI74FCT541TQE	CY74FCT2541ATQCT	CY74FCT2541CTQCT	CY74FCT2541TQCT	CY74FCT541ATQCT	CY74FCT541CTQCT	CY74FCT541TQCT
Manufacturer	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	1	1	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8	8	8
Output Type	3-State	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	15mA, 64mA	15mA, 12mA	15mA, 12mA	15mA, 12mA	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	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	-40°C ~ 85°C
Package / Case	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)
Packaging Option	-	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

All identified substitute parts are manufactured by Texas Instruments and maintain active product status, ensuring long-term availability and supply chain stability. All substitutes are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

For applications requiring output current specifications matching the original PI74FCT541TQE (15mA high, 64mA low): The CY74FCT541 series (CY74FCT541ATQCT, CY74FCT541CTQCT, CY74FCT541TQCT) provides identical output current ratings with enhanced high-side drive capability (32mA). These parts are direct functional replacements with superior current delivery characteristics.

For applications with reduced output current requirements (15mA high, 12mA low): The CY74FCT2541 series (CY74FCT2541ATQCT, CY74FCT2541CTQCT, CY74FCT2541TQCT) provides functional equivalence with lower output current specifications. Selection within this series depends on packaging requirements: Cut Tape & Digi-Reel for individual component procurement or Tape & Reel for high-volume assembly operations.

Packaging considerations: All substitute parts are available in 20-SSOP surface mount packages with identical physical dimensions (0.154", 3.90mm width), ensuring direct PCB layout compatibility. Packaging format options (Cut Tape, Tape & Reel) do not affect electrical performance and should be selected based on procurement and assembly workflow requirements.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT2541 series parts replace PI74FCT541TQE in all applications? A: CY74FCT2541 parts provide functional equivalence for non-inverting 8-bit buffering with 3-state output. However, output current specifications differ: CY74FCT2541 delivers 15mA high and 12mA low, compared to PI74FCT541TQE's 15mA high and 64mA low. Applications requiring the full 64mA low-side drive capability should use CY74FCT541 series instead.

Q: Why is CY74FCT540CTQCT listed as a substitute but not recommended? A: CY74FCT540CTQCT is an inverting buffer, not a non-inverting buffer. The PI74FCT541TQE performs non-inverting buffering, making CY74FCT540CTQCT functionally incompatible despite matching package and electrical specifications.

Q: Are there differences between CY74FCT541ATQCT, CY74FCT541CTQCT, and CY74FCT541TQCT? A: These three parts share identical electrical specifications and 20-SSOP packaging. Differences exist only in packaging format: ATQCT and CTQCT are available in Cut Tape & Digi-Reel format, while TQCT is supplied in Tape & Reel format. Selection depends on procurement method and assembly equipment compatibility.

Q: What is the significance of MSL rating differences between PI74FCT541TQE and substitute parts? A: PI74FCT541TQE carries MSL 1 (unlimited shelf life), while all Texas Instruments substitutes carry MSL 2 (1-year shelf life). MSL 2 rated components require controlled storage conditions and have a defined moisture exposure window. For applications with extended storage requirements, verify that MSL 2 handling procedures align with your supply chain practices.

Q: Are all substitute parts ROHS3 compliant? A: Yes. PI74FCT541TQE and all identified substitute parts (CY74FCT2541 and CY74FCT541 series) are ROHS3 compliant and REACH unaffected, meeting current environmental regulations.

Q: Can substitute parts be used interchangeably on the same PCB? A: CY74FCT541 and CY74FCT2541 series parts are not interchangeable due to different output current specifications. Within each series (CY74FCT541ATQCT, CY74FCT541CTQCT, CY74FCT541TQCT or CY74FCT2541ATQCT, CY74FCT2541CTQCT, CY74FCT2541TQCT), parts are electrically interchangeable; packaging format differences do not affect performance.

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