74AC240MTCX Equivalent & Substitute Parts

Part Overview

The 74AC240MTCX 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 identification of equivalent and substitute components essential for ongoing design support and production continuity. The 74AC240 series provides standard inverting buffer functionality across multiple manufacturers and packaging options, enabling direct functional replacement where electrical and mechanical parameters align.

Substiute Parts

74AC240MTCX

onsemiIn Stock: 3762974AC240MTCX Datasheet

Current PartRFQ

MC74AC240DTR2G

onsemiIn Stock: 1612MC74AC240DTR2G Datasheet

Parametric EquivalentRFQ

SN74AC240PW

Texas InstrumentsIn Stock: 1610SN74AC240PW Datasheet

DirectRFQ

SN74AC240PWR

Texas InstrumentsIn Stock: 3358SN74AC240PWR Datasheet

DirectRFQ

SN74AC240QPWRQ1

Texas InstrumentsIn Stock: 2148SN74AC240QPWRQ1 Datasheet

DirectRFQ

SN74AC240QPWRG4Q1

Texas InstrumentsIn Stock: 1228SN74AC240QPWRG4Q1 Datasheet

UpgradeRFQ

SN74AC240DBR

Texas InstrumentsIn Stock: 3170SN74AC240DBR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74AC240MTCX are classified based on the following criteria:

Parametric Equivalents share identical electrical specifications (logic type, element count, bit configuration, output type, current ratings, supply voltage, and operating temperature range) and package type (20-TSSOP). These parts are direct functional replacements with no design modifications required.

Direct Manufacturer Equivalents maintain all electrical parameters and package specifications but differ in product status or packaging format (Tube vs. Tape & Reel). These are suitable for applications where packaging format does not constrain procurement or assembly processes.

Automotive-Grade Variants extend the operating temperature range to -40°C ~ 125°C and include AEC-Q100 qualification, meeting automotive reliability standards while maintaining all other electrical and mechanical parameters.

Package Variants (20-SSOP vs. 20-TSSOP) represent similar parts with different package footprints. These are not direct pin-for-pin replacements and require PCB layout modifications.

Substitution eligibility is determined strictly by matching: logic type, element count, bits per element, output type, current ratings, supply voltage range, operating temperature range, and package type.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No Design Changes Required):

• MC74AC240DTR2G (onsemi, Active status, ROHS3 compliant, Tape & Reel packaging)
• SN74AC240PWR (Texas Instruments, Active status, ROHS3 compliant, Tape & Reel packaging)

Both parts maintain identical electrical specifications and 20-TSSOP package geometry. MC74AC240DTR2G offers the advantage of onsemi manufacturing continuity. SN74AC240PWR provides Texas Instruments sourcing with higher inventory availability (3300 pcs).

For Automotive Applications:

• SN74AC240QPWRQ1 (Texas Instruments, Active status, AEC-Q100 qualified, extended temperature range -40°C ~ 125°C)

This part extends operating temperature capability and includes automotive-grade qualification, suitable for applications requiring enhanced reliability specifications.

For Package-Constrained Designs:

• SN74AC240DBR (Texas Instruments, Active status, 20-SSOP package)

This part requires PCB layout modification due to different package footprint (20-SSOP vs. 20-TSSOP) but maintains all electrical parameters and offers active product status.

Avoid:

• SN74AC240PW (Discontinued at DiGi Electronics, limited future availability)
• SN74AC240QPWRG4Q1 (Obsolete status, limited future availability)

Frequently Asked Questions (FAQ)

Q: Can MC74AC240DTR2G directly replace 74AC240MTCX without PCB modifications? A: Yes. Both parts share identical electrical specifications (2 elements, 4 bits per element, 3-state output, 24mA output current, 2V ~ 6V supply, -40°C ~ 85°C operating range) and the same 20-TSSOP package footprint. No design changes are required.

Q: What is the difference between SN74AC240PWR and SN74AC240PW? A: Both are Texas Instruments 74AC240 parts with identical electrical specifications and 20-TSSOP packaging. The primary difference is packaging format: SN74AC240PWR is supplied in Tape & Reel (TR) format for automated assembly, while SN74AC240PW is supplied in Tube format for manual handling. SN74AC240PWR is Active; SN74AC240PW is Discontinued at DiGi Electronics.

Q: When should I use SN74AC240QPWRQ1 instead of standard 74AC240 parts? A: Use SN74AC240QPWRQ1 when your application requires automotive-grade qualification (AEC-Q100) or extended operating temperature range (-40°C ~ 125°C). Standard 74AC240 parts are rated only to 85°C. Both maintain identical electrical performance within their respective temperature ranges.

Q: Is SN74AC240DBR a suitable substitute? A: SN74AC240DBR is electrically equivalent but uses a different package (20-SSOP vs. 20-TSSOP). Pin count and function are identical, but the physical footprint differs. PCB layout redesign is required. Use only if package change is acceptable for your design.

Q: What does ROHS3 Compliant mean for these parts? A: ROHS3 Compliant indicates the part meets Restriction of Hazardous Substances Directive 3 requirements, restricting lead, cadmium, mercury, and other hazardous materials. This is a regulatory compliance specification relevant for products sold in regulated markets.

Q: Why is 74AC240MTCX marked Obsolete? A: Obsolete status indicates the manufacturer (onsemi) has discontinued active production and support. While inventory remains available (37587 pcs), long-term sourcing is not guaranteed. Transition to Active-status equivalents (MC74AC240DTR2G or SN74AC240PWR) is recommended for new designs or long-term production.