74ACT240SC Equivalent & Substitute Parts

Part Overview

The 74ACT240SC is a Buffer, Inverting logic integrated circuit manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

74ACT240SC

onsemiIn Stock: 116974ACT240SC Datasheet

Current PartRFQ

MC74ACT240DWG

onsemiIn Stock: 2271MC74ACT240DWG Datasheet

DirectRFQ

MC74ACT240DWR2G

onsemiIn Stock: 3363MC74ACT240DWR2G Datasheet

SimilarRFQ

CD74ACT240M

Harris CorporationIn Stock: 20787CD74ACT240M Datasheet

DirectRFQ

SN74ACT240DWR

Texas InstrumentsIn Stock: 2873SN74ACT240DWR Datasheet

DirectRFQ

CD74ACT240M96

Texas InstrumentsIn Stock: 817CD74ACT240M96 Datasheet

SimilarRFQ

SN74ACT240NSR

Texas InstrumentsIn Stock: 3020SN74ACT240NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT240SC are identified based on strict electrical and mechanical compatibility criteria. All substitute candidates share the following critical parameters with the main part:

• Base Product Number: 74ACT240
• Logic Type: Buffer, Inverting
• Number of Elements: 2
• Number of Bits per Element: 4
• Output Type: 3-State
• Current - Output High, Low: 24mA, 24mA
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: -40°C ~ 85°C (TA)
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC

Substitutes are categorized as either Direct or Similar based on packaging and product status alignment. Direct substitutes maintain identical packaging specifications. Similar substitutes may differ in packaging format (Tape & Reel vs. Tube vs. Cut Tape) or product status (Active vs. Obsolete) but retain full electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring ROHS3 compliance, the following active-status alternatives are available: MC74ACT240DWR2G (onsemi), SN74ACT240DWR (Texas Instruments), CD74ACT240M96 (Texas Instruments), and SN74ACT240NSR (Texas Instruments). These parts maintain full electrical compatibility with the 74ACT240SC while offering current manufacturing support.

MC74ACT240DWG and CD74ACT240M are direct substitutes with identical package specifications but carry obsolete status. CD74ACT240M additionally carries RoHS non-compliance status, which may restrict use in regulated applications.

SN74ACT240NSR differs in package width (0.209" vs. 0.295") while maintaining the 20-SOIC footprint classification. This dimensional variation requires verification against PCB layout constraints before selection.

For new designs or long-term procurement, active-status parts with ROHS3 compliance and lower MSL ratings (1 vs. 3) provide superior supply chain stability and reduced moisture handling requirements.

Frequently Asked Questions (FAQ)

Q: Can all listed substitute parts be used interchangeably with the 74ACT240SC?

A: All substitute parts share identical electrical specifications (logic type, element count, bit configuration, output type, current ratings, voltage range, and operating temperature). Physical compatibility depends on package dimensions. MC74ACT240DWG, MC74ACT240DWR2G, CD74ACT240M, SN74ACT240DWR, and CD74ACT240M96 maintain the standard 20-SOIC (0.295", 7.50mm) width. SN74ACT240NSR uses a narrower 20-SOIC (0.209", 5.30mm) package and requires PCB layout verification.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active-status parts receive ongoing manufacturing support and are recommended for new designs. Obsolete parts may have limited availability and no guaranteed future supply. For long-term applications, active-status substitutes (MC74ACT240DWR2G, SN74ACT240DWR, CD74ACT240M96, SN74ACT240NSR) are preferred.

Q: How do packaging types (Tube, Tape & Reel, Cut Tape) affect part selection?

A: Packaging type affects handling, storage, and automated assembly compatibility but does not alter electrical function. Tube packaging suits manual assembly and small-quantity applications. Tape & Reel and Cut Tape formats support high-volume automated production. Selection depends on manufacturing process requirements, not component performance.

Q: What does MSL (Moisture Sensitivity Level) indicate?

A: MSL defines moisture exposure limits during storage and handling. The 74ACT240SC carries MSL 3 (168 hours maximum exposure). Active-status substitutes from Texas Instruments (SN74ACT240DWR, CD74ACT240M96, SN74ACT240NSR) carry MSL 1 (unlimited exposure), reducing moisture-related handling constraints. onsemi's MC74ACT240DWR2G maintains MSL 3 compatibility.

Q: Is RoHS compliance a critical selection factor?

A: RoHS compliance is mandatory for applications subject to environmental regulations. The 74ACT240SC and most substitutes are ROHS3 compliant. CD74ACT240M is RoHS non-compliant and should be avoided in regulated applications. Verify compliance requirements against your application standards before final selection.