74LCX240WM Equivalent & Substitute Parts

Part Overview

The 74LCX240WM is a buffer inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design requirements and production continuity. The 74LCX240 series provides inverting buffer functionality suitable for signal conditioning and bus driving applications in low-voltage digital systems.

Substiute Parts

74LCX240WM

onsemiIn Stock: 232174LCX240WM Datasheet

Current PartRFQ

MC74LCX240DWR2G

onsemiIn Stock: 2487MC74LCX240DWR2G Datasheet

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74LVC240AD,118

Nexperia USA Inc.In Stock: 310974LVC240AD,118 Datasheet

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SN74LVC240ADW

Texas InstrumentsIn Stock: 3094SN74LVC240ADW Datasheet

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SN74LVC240ADWR

Texas InstrumentsIn Stock: 2183SN74LVC240ADWR Datasheet

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SN74LVC240ANS

Texas InstrumentsIn Stock: 2906SN74LVC240ANS Datasheet

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SN74LVC240ANSR

Texas InstrumentsIn Stock: 858SN74LVC240ANSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74LCX240WM is determined by the following critical parameters:

• Logic Type: Buffer, Inverting (2 elements, 4 bits per element)
• Output Type: 3-State
• Output Current: 24mA, 24mA (High, Low)
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Supply Voltage Range: Minimum 2V support required
• Operating Temperature: Minimum -40°C to 85°C support required

Substitute parts are grouped into two categories:

Direct Substitutes (Same Series - 74LCX): Parts maintaining the 74LCX series designation with identical electrical specifications and the same 20-SOIC package footprint.

Compatible Alternatives (74LVC Series): Parts from the 74LVC series that meet or exceed the electrical and thermal requirements of the original part, with compatible package options.

Parameter Comparison

Engineering Selection Recommendations

MC74LCX240DWR2G (onsemi): This part maintains the 74LCX series designation and identical electrical specifications to the 74LCX240WM. It is available in active product status with ROHS3 compliance. The primary distinction is packaging format (Tape & Reel) and elevated moisture sensitivity level (MSL 3). This part is the direct functional equivalent for applications where the original 74LCX series is specified.

74LVC240AD,118 (Nexperia USA Inc.): This 74LVC series alternative provides extended supply voltage range (1.2V ~ 3.6V) and expanded operating temperature range (-40°C ~ 125°C). It maintains identical logic functionality and output current specifications. The package footprint is compatible (20-SOIC, 0.295" width). This part is suitable for applications requiring broader operational parameters.

SN74LVC240ADW (Texas Instruments): This 74LVC series part from Texas Instruments offers supply voltage range of 1.65V ~ 3.6V and operating temperature range of -40°C ~ 125°C. It maintains the same 20-SOIC package footprint (0.295" width) and identical logic specifications. Product status is active with ROHS3 compliance and MSL 1 rating.

SN74LVC240ADWR (Texas Instruments): Functionally identical to SN74LVC240ADW with the same electrical and thermal specifications. Packaging format differs (Cut Tape & Digi-Reel) but maintains the same 20-SOIC footprint.

SN74LVC240ANS and SN74LVC240ANSR (Texas Instruments): These parts provide identical electrical and thermal performance to other 74LVC alternatives. The package footprint differs (20-SOIC, 0.209" width) compared to the original 74LCX240WM (0.295" width). These parts are suitable only for applications where the narrower package footprint is acceptable or required.

Frequently Asked Questions (FAQ)

Q: Can MC74LCX240DWR2G directly replace 74LCX240WM in existing designs?

A: Yes. MC74LCX240DWR2G maintains the 74LCX series designation, identical electrical specifications (2V ~ 3.6V supply, -40°C ~ 85°C operating range), and the same 20-SOIC package footprint (0.295" width). The primary consideration is moisture sensitivity level (MSL 3 versus MSL 1), which affects storage and handling requirements.

Q: What is the difference between 74LCX and 74LVC series substitutes?

A: The 74LVC series parts provide extended supply voltage range (1.2V or 1.65V minimum versus 2V) and expanded operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C). Both series maintain identical logic functionality, output current specifications, and 3-state output capability. The 74LVC series offers broader operational flexibility.

Q: Are SN74LVC240ANS and SN74LVC240ANSR compatible with the original 74LCX240WM package footprint?

A: These parts have a different package width (0.209" versus 0.295"). While the pin count and logic function are identical, the physical footprint differs. These parts are suitable only for new designs or applications where the narrower package is acceptable.

Q: What does MSL rating mean for component substitution?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to specified humidity conditions before soldering. MSL 1 (Unlimited) allows indefinite storage under controlled conditions. MSL 3 (168 Hours) requires soldering within 168 hours of package opening. For applications with extended storage or humid environments, MSL 1 rated parts are preferred.

Q: Which substitute part should be selected for new designs?

A: For new designs, select from active product status parts: MC74LCX240DWR2G (74LCX series), 74LVC240AD,118 (Nexperia), or SN74LVC240ADW/ADWR (Texas Instruments). Verify package footprint compatibility with your PCB design. The 74LVC series alternatives provide extended operational parameters and broader manufacturer availability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, consistent with the original 74LCX240WM specification.