74ACTQ240SCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ240SCX is a Buffer, Inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This device is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The 74ACTQ240SCX operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC package suitable for surface mount applications.

Substiute Parts

74ACTQ240SCX

onsemiIn Stock: 523374ACTQ240SCX Datasheet

Current PartRFQ

MC74ACT240DWG

onsemiIn Stock: 2271MC74ACT240DWG Datasheet

SimilarRFQ

74ACT240SCX

Fairchild SemiconductorIn Stock: 146674ACT240SCX Datasheet

Parametric EquivalentRFQ

MC74ACT240DWR2G

onsemiIn Stock: 3363MC74ACT240DWR2G Datasheet

Parametric EquivalentRFQ

CD74ACT240M

Harris CorporationIn Stock: 20787CD74ACT240M Datasheet

SimilarRFQ

SN74ACT240NSR

Texas InstrumentsIn Stock: 3020SN74ACT240NSR Datasheet

SimilarRFQ

CD74ACT240M96

Texas InstrumentsIn Stock: 817CD74ACT240M96 Datasheet

Parametric EquivalentRFQ

SN74ACT240DWR

Texas InstrumentsIn Stock: 2873SN74ACT240DWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACTQ240SCX are qualified based on strict electrical and mechanical parameter matching. All substitute candidates maintain identical functional specifications across the following critical parameters:

• 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 (0.295", 7.50mm Width)

Substitute parts are categorized as parametric equivalents or similar alternatives based on manufacturer, product status, and packaging configuration. All listed substitutes share the base product number 74ACT240 or 74ACTQ240 series designation.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 74ACTQ240SCX, the following selection criteria apply:

Active Product Status Priority: MC74ACT240DWR2G, 74ACT240SCX, SN74ACT240NSR, CD74ACT240M96, and SN74ACT240DWR are all active products and represent the most viable long-term substitutes. These parts ensure continued availability and manufacturer support.

RoHS3 Compliance: MC74ACT240DWR2G, SN74ACT240NSR, CD74ACT240M96, and SN74ACT240DWR all carry ROHS3 Compliant certification, meeting modern environmental and regulatory requirements. CD74ACT240M is RoHS non-compliant and should be avoided for new designs subject to RoHS regulations.

Moisture Sensitivity Level (MSL): Parts with MSL 1 (Unlimited) rating—SN74ACT240NSR, CD74ACT240M96, and SN74ACT240DWR—offer superior moisture handling characteristics suitable for extended storage and varied environmental conditions. MC74ACT240DWR2G carries MSL 3 (168 Hours), requiring controlled storage conditions.

Package Compatibility: SN74ACT240NSR features a narrower package width (0.209", 5.30mm) compared to the standard 20-SOIC (0.295", 7.50mm). All other substitutes maintain the standard package dimensions of the original 74ACTQ240SCX.

Inventory Availability: CD74ACT240M offers the highest inventory level (20,753 pcs), while MC74ACT240DWR2G (3,300 pcs) and SN74ACT240DWR (2,782 pcs) provide substantial stock for immediate procurement.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74ACTQ240SCX with any of the listed substitute parts?

A: All listed substitute parts share identical electrical and functional specifications with the 74ACTQ240SCX. Direct replacement is electrically compatible. However, verify package dimensions and MSL ratings for your specific application requirements, particularly if the device will undergo extended storage or exposure to moisture.

Q: What is the difference between the 74ACTQ240SCX and 74ACT240SCX?

A: Both parts are functionally equivalent Buffer, Inverting logic ICs with identical electrical parameters. The primary difference is manufacturer: 74ACTQ240SCX is manufactured by onsemi (obsolete status), while 74ACT240SCX is manufactured by Fairchild Semiconductor (active status). The 74ACT240SCX represents a viable active alternative.

Q: Why does SN74ACT240NSR have a different package width?

A: SN74ACT240NSR uses a 20-SO package (0.209", 5.30mm width) rather than the standard 20-SOIC (0.295", 7.50mm width). While electrically equivalent, the narrower package may affect PCB layout compatibility. Verify footprint compatibility before substitution.

Q: Which substitute part should I select for new designs?

A: For new designs, prioritize active products with ROHS3 compliance and MSL 1 rating. SN74ACT240DWR (Texas Instruments) or CD74ACT240M96 (Texas Instruments) are recommended, as they combine active product status, full RoHS3 compliance, unlimited moisture sensitivity rating, and standard package dimensions matching the original 74ACTQ240SCX.

Q: Are there any compliance or certification differences between substitutes?

A: All substitute parts carry REACH Unaffected and EAR99 ECCN classifications matching the original 74ACTQ240SCX. RoHS compliance varies: MC74ACT240DWR2G, SN74ACT240NSR, CD74ACT240M96, and SN74ACT240DWR are ROHS3 Compliant. CD74ACT240M is RoHS non-compliant. MC74ACT240DWG carries ROHS3 Compliant status. Verify compliance requirements for your application before final selection.

Q: What packaging options are available for the substitute parts?

A: Substitute parts are available in multiple packaging configurations: Tube (MC74ACT240DWG, CD74ACT240M), Tape & Reel (MC74ACT240DWR2G, SN74ACT240NSR, CD74ACT240M96), and Cut Tape & Digi-Reel (SN74ACT240DWR). Select packaging based on procurement volume and handling requirements.