CD74ACT240M Equivalent & Substitute Parts

Part Overview

The CD74ACT240M is a Buffer, Inverting logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This 20-SOIC surface mount device operates across a 4.5V to 5.5V supply range and is designed for applications requiring signal buffering and inversion in digital logic circuits. The part is currently in Last Time Buy status, making identification of equivalent and substitute components essential for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD74ACT240M
Manufacturer	Texas Instruments
Logic Type	Buffer, Inverting
Number of Elements	2
Number of Bits per Element	4
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
Base Product Number	74ACT240
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD74ACT240M is determined by strict equivalence across the following critical parameters:

Logic Type: Buffer, Inverting
Number of Elements: 2
Number of Bits per Element: 4
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)
Base Product Number: 74ACT240

All substitute parts listed maintain identical electrical specifications and mechanical compatibility. Differences in packaging format (Tube vs. Tape & Reel), product status, and moisture sensitivity level do not affect functional interchangeability in circuit applications.

Parameter Comparison

Parameter	CD74ACT240M (Main)	CD74ACT240M96	74ACT240SCX	MC74ACT240DWR2G	MC74ACT240DWG
Manufacturer	Texas Instruments	Texas Instruments	Fairchild Semiconductor	onsemi	onsemi
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting
Number of Elements	2	2	2	2	2
Number of Bits per Element	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	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	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Packaging Format	Tube	Tape & Reel (TR)	-	Tape & Reel (TR)	Tube
Product Status	Last Time Buy	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Not specified	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

For new designs and ongoing procurement, CD74ACT240M96 is the primary recommended substitute. This part maintains identical electrical and mechanical specifications while offering Active product status and availability in Tape & Reel packaging, which is standard for high-volume manufacturing operations.

MC74ACT240DWR2G from onsemi provides an alternative with Active status and Tape & Reel packaging. This part carries MSL 3 rating (168 Hours), requiring appropriate moisture control during storage and handling compared to the MSL 1 rating of the main part and CD74ACT240M96.

74ACT240SCX from Fairchild Semiconductor is electrically equivalent and currently Active. Packaging format details are not specified in available documentation.

MC74ACT240DWG from onsemi is electrically equivalent but carries Obsolete product status, making it unsuitable for new designs or long-term procurement strategies.

All substitute parts maintain ROHS3 compliance and REACH Unaffected status where specified, ensuring regulatory alignment with the original CD74ACT240M.

Frequently Asked Questions (FAQ)

Q: Can CD74ACT240M96 be used as a direct replacement for CD74ACT240M?

A: Yes. CD74ACT240M96 is functionally and electrically identical to CD74ACT240M. The primary difference is packaging format: CD74ACT240M96 is supplied in Tape & Reel format while CD74ACT240M is supplied in Tube format. Both are 20-SOIC surface mount packages with identical pin configurations and electrical characteristics.

Q: What is the significance of the MSL rating difference between CD74ACT240M and MC74ACT240DWR2G?

A: CD74ACT240M carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. MC74ACT240DWR2G carries MSL 3 (168 Hours), requiring the component to be used within 168 hours of package opening under controlled humidity conditions. This affects storage, handling, and assembly procedures but does not impact electrical performance once soldered.

Q: Why is MC74ACT240DWG listed as a substitute if it is Obsolete?

A: MC74ACT240DWG is included as a parametric equivalent for reference purposes. Its Obsolete status makes it unsuitable for new designs or future procurement. It should only be considered for legacy system repairs or maintenance where existing inventory exists.

Q: Are all substitute parts pin-compatible with CD74ACT240M?

A: Yes. All listed substitute parts share the 20-SOIC package specification with identical pin assignments. They are mechanically and electrically interchangeable at the circuit board level.

Q: What is the difference between MFR Recommended and Parametric Equivalent classifications?

A: MFR Recommended substitutes are actively supported by manufacturers and carry Active product status, ensuring long-term availability and supply chain reliability. Parametric Equivalent parts meet all electrical and mechanical specifications but may have limited availability or obsolete status.

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