MM74HC240MTC Equivalent & Substitute Parts

Part Overview

The MM74HC240MTC is a buffer inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-TSSOP package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74HC240 series provides standardized buffer inversion functionality across multiple manufacturers, enabling direct substitution based on electrical and mechanical compatibility.

Substiute Parts

MM74HC240MTC

onsemiIn Stock: 6552MM74HC240MTC Datasheet

Current PartRFQ

MC74HC240ADTR2G

onsemiIn Stock: 1626MC74HC240ADTR2G Datasheet

SimilarRFQ

SN74HC240PWR

Texas InstrumentsIn Stock: 3050SN74HC240PWR Datasheet

DirectRFQ

SN74HC240PWT

Texas InstrumentsIn Stock: 1667SN74HC240PWT Datasheet

DirectRFQ

74HC240PW,118

Nexperia USA Inc.In Stock: 109374HC240PW,118 Datasheet

UpgradeRFQ

SN74HC240DBR

Texas InstrumentsIn Stock: 4959SN74HC240DBR Datasheet

SimilarRFQ

SN74HC240PW

Texas InstrumentsIn Stock: 1297SN74HC240PW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM74HC240MTC is 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
• Current Ratings: 7.8mA output high and low
• Supply Voltage Range: 2V ~ 6V
• Package Type: 20-TSSOP or 20-SSOP (mechanically compatible)
• RoHS3 Compliance and MSL Level 1

Substitution Categories:

Direct Equivalents (20-TSSOP): Parts maintaining identical package, electrical specifications, and operating temperature range of -40°C ~ 85°C.

Similar Equivalents (20-TSSOP, Extended Temperature): Parts with identical electrical specifications but extended operating temperature range (-55°C ~ 125°C), providing enhanced thermal performance while maintaining full compatibility.

Package Variant (20-SSOP): Parts with identical electrical specifications but different package footprint (20-SSOP, 0.209" width vs. 20-TSSOP, 0.173" width), requiring PCB layout modification.

Active Status Alternatives: Parts with identical specifications and active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No PCB Modification Required):

Select SN74HC240PWR (Texas Instruments) or 74HC240PW,118 (Nexperia USA Inc.) for immediate substitution. Both maintain the 20-TSSOP package footprint and electrical specifications. SN74HC240PWR is active with standard operating temperature range. The 74HC240PW,118 offers extended operating temperature capability (-40°C ~ 125°C) with active product status, providing enhanced thermal margin for demanding applications.

For Enhanced Thermal Performance:

MC74HC240ADTR2G (onsemi) provides the widest operating temperature range (-55°C ~ 125°C) while maintaining identical package and electrical specifications. This part is active and suitable for applications requiring extended temperature operation.

For Package Variant Applications:

SN74HC240DBR (Texas Instruments) is available in 20-SSOP package (0.209" width) as an alternative when PCB layout permits package footprint modification. This part is active and maintains all electrical specifications.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring regulatory and environmental compatibility with the original MM74HC240MTC specification.

Frequently Asked Questions (FAQ)

Q: Can SN74HC240PWR directly replace MM74HC240MTC without PCB modification?

A: Yes. Both parts share identical 20-TSSOP package dimensions (0.173", 4.40mm width), electrical specifications, and operating temperature range (-40°C ~ 85°C). No PCB layout changes are required.

Q: What is the difference between MC74HC240ADTR2G and SN74HC240PWR?

A: Both parts are electrically equivalent with identical package and current ratings. MC74HC240ADTR2G operates across -55°C ~ 125°C, while SN74HC240PWR operates across -40°C ~ 85°C. MC74HC240ADTR2G provides extended thermal range for applications requiring wider temperature operation.

Q: Why is SN74HC240DBR listed as a substitute if it uses a different package?

A: SN74HC240DBR uses 20-SSOP package (0.209" width) instead of 20-TSSOP (0.173" width). While electrically equivalent, this part requires PCB layout modification and is suitable only when package footprint change is acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 rating, matching the original MM74HC240MTC specification.

Q: Which substitute part offers the best long-term availability?

A: MC74HC240ADTR2G, SN74HC240PWR, 74HC240PW,118, and SN74HC240DBR all have active product status. SN74HC240PWR and SN74HC240DBR are Texas Instruments products with established supply chains. 74HC240PW,118 is a Nexperia product with active status. MC74HC240ADTR2G is onsemi's active equivalent.

Q: Can I use parts with different operating temperature ranges interchangeably?

A: Yes, if your application operates within the overlapping temperature range. For applications requiring -40°C ~ 85°C operation, all listed parts are suitable. For applications requiring extended temperature operation below -40°C or above 85°C, select MC74HC240ADTR2G or 74HC240PW,118.

Q: What packaging options are available for the 74HC240 series?

A: Substitute parts are available in Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and Tube packaging. Select based on procurement volume and assembly requirements. All packaging options maintain identical electrical and mechanical specifications.