PI74FCT541ATQ Equivalent & Substitute Parts

Part Overview

The PI74FCT541ATQ is a non-inverting buffer logic integrated circuit manufactured by Diodes Incorporated, designed for 3-state output applications in 20-QSOP surface mount packaging. This component 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 and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT541ATQ
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)
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the PI74FCT541ATQ is determined by strict equivalence across the following critical parameters:

Functional Parameters (Must Match):

Logic Type: Buffer, Non-Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
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

Allowed Variations:

Current - Output High, Low: Substitute parts may have equal or higher current ratings (32mA high / 64mA low acceptable; 15mA high / 12mA low acceptable)
Product Status: Active substitutes are acceptable for obsolete parts
RoHS Compliance: ROHS3 compliant substitutes are acceptable
Moisture Sensitivity Level: MSL 2 acceptable for MSL 1 applications
Packaging Format: Cut Tape (CT) & Digi-Reel® or Tape & Reel (TR) acceptable

The substitute parts listed below maintain functional and electrical compatibility while offering improved availability and compliance status.

Parameter Comparison

Parameter	PI74FCT541ATQ (Main)	CY74FCT541ATQCT	CY74FCT2541ATQCT	CY74FCT2541CTQCT	CY74FCT2541TQCT	CY74FCT541CTQCT	CY74FCT541TQCT
Manufacturer	Diodes Incorporated	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	32mA, 64mA	15mA, 12mA	15mA, 12mA	15mA, 12mA	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 (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)	20-SSOP (0.154", 3.90mm Width)
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	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)
Packaging Format	20-QSOP	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
Inventory Status	921 Pcs New Original In Stock	3170 Pcs New Original In Stock	889 Pcs New Original In Stock	1130 Pcs New Original In Stock	5853 Pcs New Original In Stock	2470 Pcs New Original In Stock	995 Pcs New Original In Stock

Engineering Selection Recommendations

All listed substitute parts are manufactured by Texas Instruments and maintain active product status, providing superior long-term availability compared to the obsolete PI74FCT541ATQ. The substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements.

For applications requiring identical output current specifications (15mA high, 64mA low): The PI74FCT541ATQ cannot be directly matched on output current alone. CY74FCT541ATQCT and CY74FCT541CTQCT and CY74FCT541TQCT provide higher output high current (32mA), while CY74FCT2541ATQCT, CY74FCT2541CTQCT, and CY74FCT2541TQCT provide lower output low current (12mA).

For applications requiring maximum output current capability: CY74FCT541ATQCT, CY74FCT541CTQCT, and CY74FCT541TQCT deliver 32mA high and 64mA low output current, exceeding the original specification.

For applications with reduced output current requirements: CY74FCT2541ATQCT, CY74FCT2541CTQCT, and CY74FCT2541TQCT deliver 15mA high and 12mA low output current, suitable for lower-power applications.

For high-volume production: CY74FCT2541TQCT offers the largest available inventory (5853 pcs) with Tape & Reel packaging format.

All substitute parts maintain identical functional parameters: 1 element, 8 bits per element, 3-state output, 4.75V to 5.25V supply voltage, -40°C to 85°C operating temperature, and 20-SSOP surface mount package.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT2541ATQCT replace PI74FCT541ATQ directly?

A: CY74FCT2541ATQCT is functionally compatible as a non-inverting buffer with 1 element, 8 bits per element, and 3-state output in the same 20-SSOP package. The primary difference is output current: CY74FCT2541ATQCT provides 15mA high and 12mA low, while PI74FCT541ATQ provides 15mA high and 64mA low. Selection depends on circuit load requirements.

Q: What is the difference between CY74FCT541 and CY74FCT2541 series?

A: Both are non-inverting buffers with identical functional parameters. The primary distinction is output current capability. CY74FCT541 variants deliver 32mA high and 64mA low. CY74FCT2541 variants deliver 15mA high and 12mA low. Selection is based on the output current requirements of the application.

Q: Are all substitute parts pin-compatible with PI74FCT541ATQ?

A: All substitute parts maintain the same 20-SSOP package footprint (0.154", 3.90mm width) and are surface mount compatible. Pin configuration remains consistent across all listed alternatives.

Q: What is the difference between Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) packaging?

A: Both are standard surface mount packaging formats. Cut Tape (CT) & Digi-Reel® is suitable for smaller quantity orders and manual assembly. Tape & Reel (TR) is optimized for high-volume automated assembly. Electrical and functional specifications are identical.

Q: Why do substitute parts have MSL 2 instead of MSL 1?

A: Moisture Sensitivity Level (MSL) 2 indicates a 1-year shelf life requirement under controlled humidity conditions, compared to MSL 1 (unlimited). This is a standard industry practice for modern components and does not affect functional compatibility. Proper storage conditions must be maintained.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all Texas Instruments substitute parts listed are ROHS3 compliant, meeting current environmental regulations. The original PI74FCT541ATQ is RoHS non-compliant.

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