MM74HCT240WM Equivalent & Substitute Parts

Part Overview

The MM74HCT240WM is a logic buffer IC with inverting functionality, featuring 2 elements with 4 bits per element and 3-state output capability. Manufactured by onsemi in a 20-SOIC package, this component operates across a 4.5V to 5.5V supply voltage range and supports operating temperatures from -40°C to 85°C. The part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Logic Type	Buffer, Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
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
Current - Output High, Low	7.2mA, 7.2mA

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HCT240WM is determined by strict alignment of the following electrical and mechanical parameters:

Logic type and functional configuration (Buffer, Inverting with 2 elements, 4 bits per element)
Output type (3-State)
Supply voltage range (4.5V ~ 5.5V)
Package type (20-SOIC with 0.295" / 7.50mm width)
Surface mount mounting type
Operating temperature range compatibility

Substitute parts must maintain these core specifications. Variations in output current capability, product status, or compliance certifications do not disqualify a part from functional substitution, provided all electrical and mechanical parameters align.

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Elements / Bits	Output Type	Supply Voltage	Operating Temp	Package	Current (High/Low)	Product Status
MM74HCT240WM	onsemi	74HCT	Buffer, Inverting	2 / 4	3-State	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	7.2mA / 7.2mA	Obsolete
MC74VHCT240ADWRG	onsemi	74VHCT	Buffer, Inverting	2 / 4	3-State	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	8mA / 8mA	Active
CD74HCT240M	Harris Corporation	74HCT	Buffer, Inverting	2 / 4	3-State	4.5V ~ 5.5V	-55°C ~ 125°C	20-SOIC (7.50mm)	6mA / 6mA	Obsolete
SN74HCT240DW	Texas Instruments	74HCT	Buffer, Inverting	2 / 4	3-State	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	6mA / 6mA	Discontinued at DiGi Electronics
74HCT240D,653	Nexperia USA Inc.	74HCT	Buffer, Inverting	2 / 4	3-State	4.5V ~ 5.5V	-40°C ~ 125°C	20-SOIC (7.50mm)	6mA / 6mA	Active
CD74HCT240M96	Texas Instruments	74HCT	Buffer, Inverting	2 / 4	3-State	4.5V ~ 5.5V	-55°C ~ 125°C	20-SOIC (7.50mm)	6mA / 6mA	Active
SN74HCT240DWR	Texas Instruments	74HCT	Buffer, Inverting	2 / 4	3-State	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (7.50mm)	6mA / 6mA	Active
SN74HCT240NSR	Texas Instruments	74HCT	Buffer, Inverting	2 / 4	3-State	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (5.30mm)	6mA / 6mA	Active

Engineering Selection Recommendations

For applications currently using the MM74HCT240WM, the following selection criteria apply based on product status and compliance:

Primary Recommendation (Active Status): MC74VHCT240ADWRG (onsemi) is the manufacturer-recommended substitute, maintaining active product status with ROHS3 compliance and identical electrical specifications within the 74VHCT series.

Alternative Active Options: SN74HCT240DWR and SN74HCT240NSR (Texas Instruments) and 74HCT240D,653 (Nexperia USA Inc.) are active alternatives with full ROHS3 compliance. SN74HCT240NSR features a narrower package width (5.30mm vs. 7.50mm), requiring PCB layout verification before selection.

Extended Temperature Range: CD74HCT240M96 (Texas Instruments) and CD74HCT240M (Harris Corporation) support -55°C to 125°C operating range, suitable for applications requiring broader temperature performance. CD74HCT240M96 maintains active status with ROHS3 compliance.

Discontinued Parts: SN74HCT240DW (discontinued at DiGi Electronics) and CD74HCT240M (obsolete) are functionally equivalent but lack active product status and current availability assurance.

Frequently Asked Questions (FAQ)

Q: Can MC74VHCT240ADWRG directly replace MM74HCT240WM? A: Yes. Both parts share identical logic configuration (2 elements, 4 bits per element, 3-state output), supply voltage range (4.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and 20-SOIC package dimensions (7.50mm width). The MC74VHCT240ADWRG provides slightly higher output current (8mA vs. 7.2mA) and maintains active product status.

Q: What is the difference between 74HCT and 74VHCT series? A: Both series are logic buffer ICs with identical functional specifications for this part number. The 74VHCT designation indicates a variant within the onsemi product line. Electrical and mechanical compatibility is maintained across both series for this application.

Q: Why does SN74HCT240NSR have a different package width (5.30mm vs. 7.50mm)? A: SN74HCT240NSR uses a 20-SO package variant with narrower width compared to the standard 20-SOIC (7.50mm). While functionally equivalent, PCB footprint and layout compatibility must be verified before substitution.

Q: Are all substitute parts ROHS3 compliant? A: All active substitute parts listed (MC74VHCT240ADWRG, 74HCT240D,653, CD74HCT240M96, SN74HCT240DWR, SN74HCT240NSR) maintain ROHS3 compliance. CD74HCT240M is RoHS non-compliant and obsolete.

Q: Which substitute offers the widest operating temperature range? A: CD74HCT240M96 and CD74HCT240M both support -55°C to 125°C, compared to the standard -40°C to 85°C range. CD74HCT240M96 is the active alternative with ROHS3 compliance.

Q: Can I use parts with lower output current ratings? A: Yes, provided your circuit design does not require the full 7.2mA output current of the MM74HCT240WM. All substitute parts with 6mA output current are functionally compatible if circuit load requirements are met.

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