PI74FCT541ATS Equivalent & Substitute Parts

Part Overview

The PI74FCT541ATS 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 classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts maintain functional equivalence through identical logic type, bit configuration, output characteristics, and package specifications while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT541ATS
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-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the PI74FCT541ATS are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Electrical Parameters:

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

Allowable Variations:

Current - Output High, Low: Substitutes may have 15mA/64mA (74FCT541 series) or 15mA/12mA or 32mA/64mA (74FCT2541 series) ratings
Operating Temperature: Substitutes may operate at -40°C ~ 85°C or 0°C ~ 70°C
Packaging Format: Tube or Tape & Reel (TR)
Manufacturer: Texas Instruments (CY prefix) or Texas Instruments (CD prefix)
Product Status: Active (all substitutes are active products)
RoHS Status: ROHS3 Compliant (all substitutes)

All substitute parts maintain identical package footprint, pinout, and core logic functionality, enabling direct replacement in PCB designs.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current High/Low (mA)	Supply Voltage	Temp Range (°C)	Package	Status	RoHS	Inventory (Pcs)
PI74FCT541ATS	Diodes Inc.	Buffer, Non-Inv	1	8	3-State	15/64	4.75-5.25V	-40 to 85	20-SOIC	Obsolete	Non-compliant	734
CD74FCT541M	Texas Instruments	Buffer, Non-Inv	1	8	3-State	15/64	4.75-5.25V	0 to 70	20-SOIC	Active	ROHS3	1366
CY74FCT541ATSOC	Texas Instruments	Buffer, Non-Inv	1	8	3-State	32/64	4.75-5.25V	-40 to 85	20-SOIC	Active	ROHS3	1635
CY74FCT541ATSOCT	Texas Instruments	Buffer, Non-Inv	1	8	3-State	32/64	4.75-5.25V	-40 to 85	20-SOIC	Active	ROHS3	2200
CY74FCT541CTSOC	Texas Instruments	Buffer, Non-Inv	1	8	3-State	32/64	4.75-5.25V	-40 to 85	20-SOIC	Active	ROHS3	2200
CY74FCT541CTSOCT	Texas Instruments	Buffer, Non-Inv	1	8	3-State	32/64	4.75-5.25V	-40 to 85	20-SOIC	Active	ROHS3	868
CY74FCT541TSOC	Texas Instruments	Buffer, Non-Inv	1	8	3-State	32/64	4.75-5.25V	-40 to 85	20-SOIC	Active	ROHS3	1837
CY74FCT2541ATSOC	Texas Instruments	Buffer, Non-Inv	1	8	3-State	15/12	4.75-5.25V	-40 to 85	20-SOIC	Active	ROHS3	1431
CY74FCT2541CTSOC	Texas Instruments	Buffer, Non-Inv	1	8	3-State	15/12	4.75-5.25V	-40 to 85	20-SOIC	Active	ROHS3	1258
CY74FCT2541TSOC	Texas Instruments	Buffer, Non-Inv	1	8	3-State	15/12	4.75-5.25V	-40 to 85	20-SOIC	Active	ROHS3	2457
CY74FCT2541TSOCT	Texas Instruments	Buffer, Non-Inv	1	8	3-State	15/12	4.75-5.25V	-40 to 85	20-SOIC	Active	ROHS3	865

Engineering Selection Recommendations

Primary Recommendation for Full Compatibility: CY74FCT541ATSOC, CY74FCT541ATSOCT, CY74FCT541CTSOC, or CY74FCT541CTSOCT are the preferred substitutes. These parts maintain the exact output current specifications (32mA/64mA) and extended operating temperature range (-40°C to 85°C) matching the original PI74FCT541ATS. All are manufactured by Texas Instruments with active product status and ROHS3 compliance. Selection between tube (SOC) and tape & reel (SOCT) packaging depends on procurement and assembly requirements.

Alternative for Relaxed Temperature Requirements: CD74FCT541M is suitable for applications where the operating temperature range can be limited to 0°C to 70°C. This part maintains identical output current specifications (15mA/64mA) and offers the highest inventory availability (1366 units). ROHS3 compliance and active product status ensure long-term supply continuity.

Lower Current Output Alternative: CY74FCT2541 series parts (ATSOC, CTSOC, TSOC, TSOCT) provide functional substitution with reduced output low current (12mA versus 64mA). These are suitable only for applications where the lower sink current does not compromise circuit performance. Extended temperature range (-40°C to 85°C) and ROHS3 compliance are maintained.

Compliance Advantage: All substitute parts are ROHS3 compliant, addressing the non-compliance status of the original PI74FCT541ATS. This is critical for new designs and procurement in regulated markets.

Frequently Asked Questions (FAQ)

Q: Can I directly replace PI74FCT541ATS with any of the listed substitutes? A: Direct replacement is possible for all listed substitutes at the PCB level due to identical 20-SOIC package footprint and pinout. However, verify that your circuit design can accommodate the output current specifications of the selected substitute. CY74FCT541 series parts (32mA/64mA) provide the closest electrical match to the original part.

Q: What is the difference between CY74FCT541 and CY74FCT2541 series? A: Both series maintain identical logic function, package, and pinout. The primary difference is output current capability. CY74FCT541 provides 32mA high and 64mA low output current, while CY74FCT2541 provides 15mA high and 12mA low output current. Select based on your circuit's current sink and source requirements.

Q: Does operating temperature range affect substitution? A: Yes. The original PI74FCT541ATS operates from -40°C to 85°C. Most substitutes maintain this range. CD74FCT541M is limited to 0°C to 70°C and is suitable only for applications within this narrower range. Verify your application's temperature requirements before selection.

Q: What is the difference between Tube and Tape & Reel packaging? A: Both packaging formats contain identical parts. Tube packaging is suitable for manual assembly and small-volume procurement. Tape & Reel (TR) packaging is optimized for automated pick-and-place assembly and high-volume production. Select based on your manufacturing process.

Q: Why are all substitutes ROHS3 compliant while the original is not? A: The PI74FCT541ATS is an obsolete part manufactured before current RoHS compliance requirements were standardized. All active substitute parts from Texas Instruments meet current ROHS3 compliance standards, making them suitable for modern supply chains and regulated applications.

Q: Can I use CD74FCT541M if my application requires -40°C operation? A: No. CD74FCT541M is rated only to 0°C minimum operating temperature. For applications requiring -40°C operation, select from CY74FCT541 or CY74FCT2541 series parts, which maintain the extended temperature range.

Q: Are there any pinout differences between substitutes? A: No. All substitute parts maintain identical 20-SOIC pinout and package dimensions (0.295", 7.50mm width). PCB layout and footprint remain unchanged.

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