CD74ACT540M Equivalent & Substitute Parts

Part Overview

The CD74ACT540M is a Buffer, Inverting logic IC manufactured by Texas Instruments, designed for 3-State output applications in 20-SOIC surface mount packaging. This part operates across a 4.5V to 5.5V supply voltage range with 24mA output current capability and supports operating temperatures from -55°C to 125°C. The CD74ACT540M is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing production and maintenance applications requiring this inverting buffer functionality.

Key Parameters

Parameter	Value
Logic Type	Buffer, 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	-55°C ~ 125°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the CD74ACT540M are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Functional Parameters: Logic type (Buffer, Inverting), number of elements (1), bits per element (8), output type (3-State), output current (24mA, 24mA), and supply voltage range (4.5V ~ 5.5V).

Mechanical Parameters: Package type (20-SOIC), mounting type (Surface Mount), and physical dimensions (0.295", 7.50mm Width).

Compliance Parameters: RoHS3 compliance and REACH unaffected status.

Substitute parts are grouped into two categories:

Direct Texas Instruments Substitutes: CD74ACT540M96 maintains identical electrical specifications and RoHS compliance with the original part, differing only in packaging format (Cut Tape & Digi-Reel versus Tube).

onsemi Manufacturer Substitutes: MC74ACT540DWG and MC74ACT540DWR2G are onsemi-manufactured equivalents that maintain core functional and mechanical compatibility. These parts operate within the same 4.5V to 5.5V supply range and 20-SOIC package, with operating temperature range of -40°C to 85°C and MSL rating of 3 (168 Hours).

Parameter Comparison

Parameter	CD74ACT540M	CD74ACT540M96	MC74ACT540DWG	MC74ACT540DWR2G
Manufacturer	Texas Instruments	Texas Instruments	onsemi	onsemi
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting
Number of Elements	1	1	1	1
Number of Bits per Element	8	8	8	8
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Discontinued	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

CD74ACT540M96 is the primary substitute for the discontinued CD74ACT540M. Both parts are manufactured by Texas Instruments, maintain identical electrical specifications, and carry ROHS3 compliance with MSL 1 rating. The CD74ACT540M96 differs only in packaging format (Cut Tape & Digi-Reel versus Tube) and is currently in active production status with confirmed inventory availability.

MC74ACT540DWG and MC74ACT540DWR2G are qualified onsemi equivalents suitable for applications where the narrower operating temperature range (-40°C to 85°C versus -55°C to 125°C) and higher MSL rating (3 versus 1) are acceptable. Both onsemi parts maintain functional and mechanical compatibility with the original CD74ACT540M, with MC74ACT540DWR2G supplied in Tape & Reel format and MC74ACT540DWG supplied in Tube format. Selection between these onsemi options depends on packaging requirements for assembly processes.

Frequently Asked Questions (FAQ)

Q: Can CD74ACT540M96 be used as a direct replacement for CD74ACT540M?

A: Yes. CD74ACT540M96 is a direct functional equivalent manufactured by Texas Instruments with identical electrical specifications, supply voltage range (4.5V ~ 5.5V), output current (24mA), operating temperature range (-55°C ~ 125°C), and 20-SOIC package. The only difference is packaging format.

Q: What are the key differences between Texas Instruments and onsemi substitutes?

A: Texas Instruments CD74ACT540M96 maintains the original -55°C to 125°C operating temperature range and MSL 1 rating. onsemi parts (MC74ACT540DWG and MC74ACT540DWR2G) operate within -40°C to 85°C and carry MSL 3 (168 Hours) rating. All parts share identical logic functionality, output type, current ratings, and 20-SOIC packaging.

Q: How do packaging formats differ among substitutes?

A: CD74ACT540M is supplied in Tube format. CD74ACT540M96 is available in Cut Tape & Digi-Reel format. MC74ACT540DWG is supplied in Tube format. MC74ACT540DWR2G is supplied in Tape & Reel format. Packaging selection depends on assembly process requirements and volume considerations.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. CD74ACT540M96, MC74ACT540DWG, and MC74ACT540DWR2G are all ROHS3 compliant and REACH unaffected, matching the compliance status of the original CD74ACT540M.

Q: What is the significance of MSL rating differences?

A: The original CD74ACT540M carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. onsemi substitutes carry MSL 3 (168 Hours), requiring controlled storage and handling conditions. MSL 3 components must be stored in dry conditions and have a 168-hour floor life after moisture exposure.

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