MM74HC240MTCX Equivalent & Substitute Parts

Part Overview

The MM74HC240MTCX is a Buffer, Inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This 20-TSSOP surface mount device operates across a 2V to 6V supply voltage range and is classified as Active product status. The part is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Finding equivalent and substitute parts becomes necessary when the primary part reaches end-of-life status, inventory constraints occur, or alternative sourcing is required for supply chain optimization. The 74HC240 logic family offers multiple manufacturer variants that maintain functional and electrical 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 Range	-40°C ~ 85°C (TA)
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution relationships for the MM74HC240MTCX are determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Logic Type: Buffer, Inverting (2 elements, 4 bits per element)
Output Type: 3-State
Output Current: 7.8mA (High and Low)
Supply Voltage Range: 2V ~ 6V
Package Type: 20-TSSOP or 20-SSOP (mechanically compatible)
Base Product Number: 74HC240
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are grouped into the following categories based on their relationship to the main part:

Similar Manufacturer Parts: Parts with identical electrical specifications and compatible packaging from alternative manufacturers.

Direct Manufacturer Parts: Parts from different manufacturers with identical electrical and mechanical specifications.

Upgrade Parts: Parts with extended operating temperature ranges or enhanced specifications while maintaining core electrical compatibility.

Parametric Equivalents: Parts with identical electrical performance and package compatibility.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Output Type	Current (mA)	Supply Voltage	Operating Temp (°C)	Package	Product Status
MM74HC240MTCX	onsemi	Buffer, Inverting	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-TSSOP	Active
MC74HC240ADTR2G	onsemi	Buffer, Inverting	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	20-TSSOP	Active
SN74HC240PW	Texas Instruments	Buffer, Inverting	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-TSSOP	Discontinued at DiGi Electronics
SN74HC240PWR	Texas Instruments	Buffer, Inverting	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-TSSOP	Active
74HC240PW,118	Nexperia USA Inc.	Buffer, Inverting	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 125	20-TSSOP	Active
SN74HC240DBR	Texas Instruments	Buffer, Inverting	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SSOP	Active
SN74HC240APWR	Texas Instruments	Buffer, Inverting	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-TSSOP	Active
SN74HC240PWT	Texas Instruments	Buffer, Inverting	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-TSSOP	Discontinued at DiGi Electronics

Engineering Selection Recommendations

Primary Substitutes (Active Status, Identical Specifications):

SN74HC240PWR (Texas Instruments): Active product status with identical electrical and mechanical specifications. Recommended for direct replacement in new designs and production runs.
SN74HC240APWR (Texas Instruments): Active product status with identical specifications. Suitable for applications requiring Texas Instruments sourcing.
74HC240PW,118 (Nexperia USA Inc.): Active product status with extended operating temperature range (-40°C to 125°C). Recommended for applications requiring enhanced temperature performance.

Secondary Substitutes (Extended Temperature Range):

MC74HC240ADTR2G (onsemi): Active product status with extended operating temperature range (-55°C to 125°C). Suitable for applications requiring wider temperature operation while maintaining onsemi sourcing.

Package Variant (20-SSOP):

SN74HC240DBR (Texas Instruments): Active product status with identical electrical specifications but 20-SSOP package (0.209", 5.30mm Width). Suitable only for designs accommodating the wider SSOP package footprint.

Discontinued Parts (Limited Availability):

SN74HC240PW (Texas Instruments): Discontinued at DiGi Electronics. Avoid for new designs; use only if existing inventory is available.
SN74HC240PWT (Texas Instruments): Discontinued at DiGi Electronics. Avoid for new designs; use only if existing inventory is available.

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity level, ensuring regulatory and environmental compatibility with the original MM74HC240MTCX.

Frequently Asked Questions (FAQ)

Q: Can SN74HC240PWR be used as a direct replacement for MM74HC240MTCX? A: Yes. SN74HC240PWR is a direct substitute with identical electrical specifications (2V ~ 6V supply, 7.8mA output current, -40°C ~ 85°C operating range) and identical 20-TSSOP package. Both parts are Active status and ROHS3 compliant.

Q: What is the difference between 20-TSSOP and 20-SSOP packages? A: The 20-TSSOP package has a width of 0.173" (4.40mm), while the 20-SSOP package has a width of 0.209" (5.30mm). The SN74HC240DBR uses the wider 20-SSOP package and requires PCB layout modifications. Use only if your design accommodates the larger footprint.

Q: Why would I choose MC74HC240ADTR2G over MM74HC240MTCX? A: MC74HC240ADTR2G offers an extended operating temperature range of -55°C to 125°C compared to MM74HC240MTCX's -40°C to 85°C. Select this part for applications requiring operation at lower temperatures or higher temperature extremes while maintaining onsemi sourcing.

Q: Is 74HC240PW,118 suitable for high-temperature applications? A: Yes. The 74HC240PW,118 from Nexperia USA Inc. operates across -40°C to 125°C, providing extended high-temperature capability. All other electrical specifications remain identical to the MM74HC240MTCX.

Q: Should I use discontinued parts like SN74HC240PW? A: Discontinued parts should be avoided for new designs. Use only if you have confirmed existing inventory availability. For new production, select from Active status parts: SN74HC240PWR, SN74HC240APWR, 74HC240PW,118, or MC74HC240ADTR2G.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity level, ensuring full regulatory compatibility with the original MM74HC240MTCX.

Q: Can I mix different manufacturers in the same design? A: Yes. All substitute parts maintain identical electrical specifications and package compatibility (except SN74HC240DBR). Mixing manufacturers is acceptable from an electrical standpoint, though single-source procurement may be preferred for supply chain consistency.

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