74LCX240MSA Equivalent & Substitute Parts

Part Overview

The 74LCX240MSA is an inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component operates across a 2V to 3.6V supply voltage range and is housed in a 20-SSOP package. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production continuity. Substitute parts maintain functional equivalence while offering improved availability and extended product lifecycle status from active manufacturers.

Substiute Parts

74LCX240MSA

onsemiIn Stock: 91274LCX240MSA Datasheet

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74LVC240APW,118

NXP SemiconductorsIn Stock: 4294474LVC240APW,118 Datasheet

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SN74LVC240ADBR

Texas InstrumentsIn Stock: 2869SN74LVC240ADBR Datasheet

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SN74LVC240ADGVR

Texas InstrumentsIn Stock: 2857SN74LVC240ADGVR Datasheet

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SN74LVC240APW

Texas InstrumentsIn Stock: 2269SN74LVC240APW Datasheet

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SN74LVC240APWR

Texas InstrumentsIn Stock: 7481SN74LVC240APWR Datasheet

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SN74LVC240APWRG4

Texas InstrumentsIn Stock: 3406SN74LVC240APWRG4 Datasheet

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SN74LVC240APWT

Texas InstrumentsIn Stock: 1739SN74LVC240APWT Datasheet

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SN74LVCZ240APW

Texas InstrumentsIn Stock: 1309SN74LVCZ240APW Datasheet

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SN74LVCZ240APWR

Texas InstrumentsIn Stock: 1091SN74LVCZ240APWR Datasheet

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SN74LVCZ240APWT

Texas InstrumentsIn Stock: 752SN74LVCZ240APWT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following core parameters: logic type (Buffer, Inverting), element count (2), bits per element (4), output type (3-State), and output current capability (24mA minimum for both high and low states). All substitute parts must maintain these functional specifications.

Supply voltage compatibility is evaluated on a case-by-case basis. The 74LCX240MSA operates at 2V ~ 3.6V. Substitute parts operating at 1.2V ~ 3.6V or 1.65V ~ 3.6V are functionally compatible within the original specification range. The 74LVCZ series (2.7V ~ 3.6V) is compatible with the original voltage window.

Package compatibility includes both 20-SSOP and 20-TSSOP variants, as both are surface-mount packages with identical pinout and electrical characteristics. Operating temperature ranges may extend beyond the original specification without affecting substitution validity.

Parameter Comparison

Engineering Selection Recommendations

For new designs and production continuity, the 74LVC series from Texas Instruments and NXP Semiconductors provides the most robust substitution path. All 74LVC variants maintain active product status with extended operating temperature ranges (-40°C ~ 125°C) and RoHS3 compliance certification.

SN74LVC240ADBR is the direct package equivalent to the 74LCX240MSA, both utilizing the 20-SSOP package. This part is manufactured by Texas Instruments with active product status and RoHS3 compliance.

For applications where package footprint flexibility exists, the 74LVC240APW,118 from NXP Semiconductors offers the widest supply voltage range (1.2V ~ 3.6V) in a 20-TSSOP package with active status.

The 74LVCZ series (SN74LVCZ240APW and SN74LVCZ240APWR) maintains the original operating temperature specification (-40°C ~ 85°C) while providing active product status and RoHS3 compliance. These parts are suitable for applications requiring thermal performance alignment with the original 74LCX240MSA.

Avoid SN74LVC240APWRG4 and SN74LVCZ240APWT, which are discontinued at DiGi Electronics despite inventory availability.

Frequently Asked Questions (FAQ)

Q: Can I use a 74LVC substitute in place of the 74LCX240MSA without circuit modifications?

A: Yes. All listed 74LVC and 74LVCZ substitutes maintain identical logic functionality (2-element, 4-bit inverting buffer with 3-state output) and output current specifications (24mA). Pin configuration and electrical behavior are compatible within the original 2V ~ 3.6V supply window.

Q: What is the difference between 20-SSOP and 20-TSSOP packages?

A: Both are surface-mount packages with identical pinout and electrical characteristics. 20-SSOP has a 5.30mm width, while 20-TSSOP has a 4.40mm width. The narrower 20-TSSOP package reduces PCB footprint. Substitution between these packages requires PCB layout verification.

Q: Does the extended operating temperature range of 74LVC parts (-40°C ~ 125°C) affect compatibility?

A: No. Extended temperature range does not impact substitution validity. The original 74LCX240MSA specification (-40°C ~ 85°C) remains fully supported by all 74LVC substitutes.

Q: Are there supply voltage limitations when substituting with 74LVC parts?

A: The 74LVC240 variants operate at 1.65V ~ 3.6V, which fully encompasses the original 2V ~ 3.6V specification. The 74LVC240APW,118 extends to 1.2V ~ 3.6V. The 74LVCZ series operates at 2.7V ~ 3.6V, which is compatible with the original window. All substitutes function correctly within the original voltage range.

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

A: SN74LVC240APWR from Texas Instruments is recommended for production designs. It maintains active product status, RoHS3 compliance, and is available in tape and reel packaging with substantial inventory levels.

Q: Can I mix different substitute part numbers in the same design?

A: Yes, provided they are used in identical circuit positions. All listed substitutes are functionally equivalent. However, maintaining consistent part sourcing within a single production run is recommended for supply chain efficiency.