MM74HC240N Equivalent & Substitute Parts

Part Overview

The MM74HC240N is a logic buffer IC manufactured by onsemi, classified as an inverting buffer with 2 elements and 4 bits per element, featuring 3-state output capability. This component is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The 74HC240 series represents a standard logic family with multiple manufacturers offering compatible alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Logic Type	Buffer, Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Base Product Number	74HC240

Substitute Part Grouping Explanation

Substitution of the MM74HC240N is determined by strict equivalence across the following parameters:

Logic Function: Buffer, Inverting with 2 elements and 4 bits per element
Output Configuration: 3-State output
Electrical Performance: Output current of 7.8mA (high and low), supply voltage range 2V to 6V
Package Compatibility: 20-DIP (0.300", 7.62mm) through-hole mounting
Base Product Series: 74HC240 logic family

All substitute parts listed maintain identical functional specifications and package footprints. Variations in operating temperature range, product status, and compliance certifications are noted but do not affect core substitutability for applications within the specified operating conditions.

Parameter Comparison

Parameter	MM74HC240N (onsemi)	CD74HC240E (TI)	SN74HC240N (TI)	SN74HC240AN (TI)	SN74HC240NE4 (TI)
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active
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	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All listed substitute parts are functionally equivalent to the MM74HC240N within the specified electrical and mechanical parameters. Selection among active alternatives should be based on the following factors:

Product Status: The MM74HC240N is obsolete. All Texas Instruments alternatives (CD74HC240E, SN74HC240N, SN74HC240AN, SN74HC240NE4) maintain active product status, ensuring ongoing availability and support.

Compliance Certifications: The Texas Instruments variants SN74HC240N, SN74HC240AN, and SN74HC240NE4 carry ROHS3 compliance certification. The CD74HC240E does not specify RoHS status. All parts maintain REACH Unaffected status.

Operating Temperature Range: The CD74HC240E provides an extended operating temperature range of -55°C to 125°C, compared to -40°C to 85°C for other variants. This extended range is applicable only if the application requires operation beyond the standard range.

Packaging and Inventory: All parts are available in 20-DIP through-hole configuration. Packaging options vary (Bulk, Tube) but do not affect electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the MM74HC240N be directly replaced with any of the listed substitutes?

A: Yes. All listed parts are pin-compatible and electrically equivalent within the specified parameters. Direct substitution is possible for applications operating within -40°C to 85°C and 2V to 6V supply voltage.

Q: What is the difference between CD74HC240E and the SN74HC240 variants?

A: The CD74HC240E is manufactured by Texas Instruments with bulk packaging and an extended operating temperature range of -55°C to 125°C. The SN74HC240N, SN74HC240AN, and SN74HC240NE4 are also Texas Instruments products with tube packaging and standard operating temperature range of -40°C to 85°C. All maintain identical electrical specifications for output current, supply voltage, and logic function.

Q: Are there any compliance differences between substitutes?

A: The SN74HC240N, SN74HC240AN, and SN74HC240NE4 carry ROHS3 compliance certification. The CD74HC240E does not specify RoHS status. All parts are REACH Unaffected. Compliance requirements should be verified against application specifications.

Q: Does package type affect substitutability?

A: No. All parts use the same 20-DIP (0.300", 7.62mm) through-hole package. Packaging format (Bulk or Tube) refers to supplier delivery method and does not affect electrical or mechanical compatibility.

Q: Which substitute offers the best availability?

A: The SN74HC240N shows the highest inventory level (2572 Pcs) among active alternatives, followed by CD74HC240E (1572 Pcs) and SN74HC240AN (1268 Pcs). Availability should be confirmed with current suppliers.

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