74ACTQ541SC Equivalent & Substitute Parts

Part Overview

The 74ACTQ541SC is a non-inverting buffer logic IC manufactured by onsemi, designed for 8-bit bus driving applications with 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC surface mount package. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACTQ541SC
Manufacturer	onsemi
Logic Type	Buffer, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 74ACTQ541SC are qualified based on the following critical parameters that must remain constant across all equivalent devices:

Logic Type: Buffer, Non-Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Current - Output High, Low: 24mA, 24mA
Voltage - Supply: 4.5V ~ 5.5V
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount

All substitute parts listed maintain these electrical and mechanical specifications, ensuring functional compatibility within the original design parameters. Variations in operating temperature range, product status, and packaging format (bulk, cut tape, tube) do not affect core substitutability.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements / Bits	Output Type	Current (mA)	Supply Voltage	Operating Temp	Package	Product Status
74ACTQ541SC	onsemi	Buffer, Non-Inverting	1 / 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Obsolete
74ACT541SC	Fairchild Semiconductor	Buffer, Non-Inverting	1 / 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active
MC74ACT541DWR2G	onsemi	Buffer, Non-Inverting	1 / 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active
MC74ACT541DWG	onsemi	Buffer, Non-Inverting	1 / 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active
CD74ACT541M	Texas Instruments	Buffer, Non-Inverting	1 / 8	3-State	24, 24	4.5V ~ 5.5V	-55°C ~ 125°C	20-SOIC	Discontinued at DiGi Electronics
CD74ACT541M96	Texas Instruments	Buffer, Non-Inverting	1 / 8	3-State	24, 24	4.5V ~ 5.5V	-55°C ~ 125°C	20-SOIC	Active

Engineering Selection Recommendations

For applications requiring the 74ACTQ541SC, the following substitute parts are qualified based on electrical and mechanical parameter equivalence:

Primary Substitutes (Active Status):

MC74ACT541DWR2G (onsemi) - Active product with RoHS3 compliance
MC74ACT541DWG (onsemi) - Active product with RoHS3 compliance
CD74ACT541M96 (Texas Instruments) - Active product with RoHS3 compliance and extended operating temperature range (-55°C ~ 125°C)
74ACT541SC (Fairchild Semiconductor) - Active product with equivalent specifications

Secondary Substitute (Limited Availability):

CD74ACT541M (Texas Instruments) - Discontinued at DiGi Electronics but available through inventory channels

All listed substitutes maintain the core electrical specifications (24mA output current, 4.5V to 5.5V supply voltage, 3-state output) and identical 20-SOIC package footprint. Selection among active alternatives should prioritize availability, lead time, and compliance certifications relevant to the end application.

Frequently Asked Questions (FAQ)

Q: Can I use CD74ACT541M96 as a direct replacement for 74ACTQ541SC? A: Yes. Both parts share identical logic type, element count, bit configuration, output type, current ratings, supply voltage, and 20-SOIC package. The CD74ACT541M96 offers an extended operating temperature range (-55°C ~ 125°C versus -40°C ~ 85°C), which provides additional thermal margin without affecting core functionality.

Q: What is the difference between MC74ACT541DWR2G and MC74ACT541DWG? A: Both parts are electrically and mechanically equivalent. The primary difference is packaging format: MC74ACT541DWR2G is supplied in Cut Tape (CT) & Digi-Reel format, while MC74ACT541DWG is supplied in Tube format. Selection depends on procurement and assembly requirements.

Q: Is the 74ACT541SC from Fairchild Semiconductor compatible with the original 74ACTQ541SC design? A: Yes. The 74ACT541SC maintains all critical electrical parameters and the identical 20-SOIC package. The primary difference is the manufacturer (Fairchild Semiconductor versus onsemi) and active product status, making it a viable long-term alternative.

Q: Why does CD74ACT541M have a wider operating temperature range? A: The CD74ACT541M and CD74ACT541M96 are qualified by Texas Instruments for -55°C ~ 125°C operation, compared to the original 74ACTQ541SC specification of -40°C ~ 85°C. This extended range does not affect substitutability for applications within the original temperature limits.

Q: Are all substitute parts RoHS compliant? A: MC74ACT541DWR2G, MC74ACT541DWG, CD74ACT541M, and CD74ACT541M96 are RoHS3 compliant. The 74ACT541SC from Fairchild Semiconductor compliance status is not specified in the provided data.

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