MM74HCT240MTCX Equivalent & Substitute Parts

Part Overview

The MM74HCT240MTCX is a high-speed CMOS logic buffer IC with inverting functionality, manufactured by onsemi. This 20-TSSOP surface mount device provides 2 elements with 4 bits per element and 3-state output capability. The part is currently in active production status with 6719 units in stock.

Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when sourcing from multiple suppliers is needed for supply chain resilience.

Substiute Parts

MM74HCT240MTCX

onsemiIn Stock: 6765MM74HCT240MTCX Datasheet

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MC74HC240ADTR2G

onsemiIn Stock: 1626MC74HC240ADTR2G Datasheet

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74HCT240PW,118

NXP USA Inc.In Stock: 313474HCT240PW,118 Datasheet

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CD74HCT240PW

Texas InstrumentsIn Stock: 1733CD74HCT240PW Datasheet

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CD74HCT240PWT

National SemiconductorIn Stock: 3688CD74HCT240PWT Datasheet

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SN74HCT240PW

Texas InstrumentsIn Stock: 2970SN74HCT240PW Datasheet

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SN74HCT240PWR

Texas InstrumentsIn Stock: 65948SN74HCT240PWR Datasheet

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SN74HCT240PWT

Texas InstrumentsIn Stock: 1408SN74HCT240PWT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HCT240MTCX is determined by the following critical parameters:

Functional Equivalence Requirements:

• Logic Type: Buffer, Inverting
• Number of Elements: 2
• Number of Bits per Element: 4
• Output Type: 3-State
• Package Type: 20-TSSOP

Electrical Compatibility Requirements:

• Voltage Supply Range: Must encompass or match 4.5V ~ 5.5V
• Current Output Ratings: Must meet or exceed 7.2mA per channel
• Operating Temperature: Must support -40°C minimum and 85°C maximum

Compliance Requirements:

• RoHS3 Compliance
• Moisture Sensitivity Level: 1 (Unlimited)

Parts meeting all functional and electrical requirements are classified as direct substitutes. Parts with extended temperature ranges or higher current ratings remain compatible within the specified operating window of the MM74HCT240MTCX.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

SN74HCT240PWR and SN74HCT240PWT are the preferred substitutes. Both are manufactured by Texas Instruments, maintain identical voltage supply specifications (4.5V ~ 5.5V), and operate within the same temperature range (-40°C ~ 85°C) as the MM74HCT240MTCX. SN74HCT240PWR offers the highest inventory availability (65880 units) and is available in Cut Tape & Digi-Reel packaging, matching the original part's packaging format. Both parts are ROHS3 compliant with MSL 1 rating.

Secondary Substitutes (Extended Temperature Range):

CD74HCT240PW and CD74HCT240PWT provide extended operating temperature ranges (-55°C ~ 125°C) while maintaining the same voltage supply specifications. These parts are suitable for applications requiring broader temperature performance. CD74HCT240PW is currently in Last Time Buy status, indicating limited future availability. CD74HCT240PWT remains in active production with 3644 units in stock.

Alternative Voltage Range:

MC74HC240ADTR2G, manufactured by onsemi, operates across a wider voltage supply range (2V ~ 6V) and extended temperature range (-55°C ~ 125°C). This part is from the 74HC series rather than 74HCT series. While functionally equivalent in logic operation, the broader voltage tolerance makes it suitable for applications with variable supply conditions.

Discontinued Parts:

SN74HCT240PW and SN74HCT240PWT are marked as discontinued at DiGi Electronics. While inventory remains available, these parts should not be selected for new designs requiring long-term supply assurance.

Packaging Considerations:

The original MM74HCT240MTCX is supplied in Cut Tape & Digi-Reel format. SN74HCT240PWR maintains this packaging format. Alternative packaging formats (Tube, Tape & Reel, Bulk) may require process adjustments in automated assembly environments.

Frequently Asked Questions (FAQ)

Q: Can MC74HC240ADTR2G be used as a direct replacement for MM74HCT240MTCX?

A: MC74HC240ADTR2G is functionally equivalent in logic operation but belongs to the 74HC series rather than 74HCT series. The 74HC series operates across a wider voltage range (2V ~ 6V) compared to the 74HCT specification (4.5V ~ 5.5V). In applications where supply voltage is strictly maintained at 4.5V ~ 5.5V, both parts are compatible. The extended voltage tolerance of the 74HC variant provides additional flexibility for variable supply conditions.

Q: What is the difference between Cut Tape & Digi-Reel and Tape & Reel packaging?

A: Cut Tape & Digi-Reel packaging supplies individual components on tape that can be cut to length, suitable for lower-volume or mixed-component assembly. Tape & Reel packaging provides continuous tape on a reel, optimized for high-volume automated assembly. Both formats contain the same component in the same 20-TSSOP package; the difference is in the supply format and handling for manufacturing processes.

Q: Why do some substitutes have lower current output ratings (6mA vs 7.2mA)?

A: The MM74HCT240MTCX specifies 7.2mA output current. Substitute parts with 6mA ratings remain compatible because they meet the minimum functional requirements for 3-state buffer operation. The lower rating indicates more conservative specifications from the manufacturer. Applications requiring the full 7.2mA output capability should verify the substitute part's datasheet for specific load conditions.

Q: Are all listed substitutes ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the MM74HCT240MTCX. This ensures compatibility with modern manufacturing and environmental regulations.

Q: What is the significance of "Last Time Buy" status for CD74HCT240PW?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this part. While current inventory is available, future orders may not be possible. For new designs or long-term production requirements, select parts with Active status such as SN74HCT240PWR or CD74HCT240PWT.

Q: Can parts with extended temperature ranges (-55°C ~ 125°C) be used in applications limited to -40°C ~ 85°C?

A: Yes. Extended temperature range specifications are backward compatible. A part rated for -55°C ~ 125°C operates correctly within the narrower -40°C ~ 85°C window. The extended rating provides additional margin and flexibility for future application changes.