74ACTQ240SJX Equivalent & Substitute Parts

Part Overview

The 74ACTQ240SJX is a Buffer, Inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component operates at 4.5V to 5.5V supply voltage with 24mA output current capacity and supports operating temperatures from -40°C to 85°C. The part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

74ACTQ240SJX

onsemiIn Stock: 101274ACTQ240SJX Datasheet

Current PartRFQ

CD74ACT240M

Harris CorporationIn Stock: 20787CD74ACT240M Datasheet

SimilarRFQ

CD74ACT240M96

Texas InstrumentsIn Stock: 817CD74ACT240M96 Datasheet

SimilarRFQ

SN74ACT240DWR

Texas InstrumentsIn Stock: 2873SN74ACT240DWR Datasheet

SimilarRFQ

SN74ACT240NSR

Texas InstrumentsIn Stock: 3020SN74ACT240NSR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACTQ240SJX is determined by matching the following critical parameters: Logic Type (Buffer, Inverting), Number of Elements (2), Number of Bits per Element (4), Output Type (3-State), Current ratings (24mA output high and low), Supply Voltage range (4.5V ~ 5.5V), Operating Temperature range (-40°C ~ 85°C), and Mounting Type (Surface Mount). Package variations within the 20-pin SOIC/SOP family are permitted substitutes provided all electrical parameters remain identical. All identified substitute parts meet these core requirements.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing procurement, CD74ACT240M96 (Texas Instruments), SN74ACT240DWR (Texas Instruments), and SN74ACT240NSR (Texas Instruments) are preferred substitutes due to their Active product status and ROHS3 compliance. These parts maintain full electrical and functional equivalence to the 74ACTQ240SJX while offering superior long-term availability and regulatory compliance.

CD74ACT240M (Harris Corporation) is electrically equivalent but carries Obsolete status and RoHS non-compliance, limiting its suitability for new applications.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT240DWR replace 74ACTQ240SJX in existing designs? A: Yes. Both parts share identical electrical specifications: 2-element, 4-bit buffer inverter with 3-state output, 24mA drive capability, 4.5V–5.5V supply range, and -40°C to 85°C operating temperature. Package differences (20-SOIC vs. 20-SOP) are mechanically compatible within standard PCB footprints.

Q: What is the difference between CD74ACT240M96 and SN74ACT240NSR? A: Both are functionally equivalent. CD74ACT240M96 uses 20-SOIC packaging (0.295" width) with Tape & Reel packaging. SN74ACT240NSR uses 20-SO packaging (0.209" width) with Tape & Reel packaging. Electrical performance is identical; selection depends on PCB layout requirements and packaging preference.

Q: Why is the 74ACTQ240SJX marked obsolete? A: The 74ACTQ240SJX is classified as obsolete by the original manufacturer. Active equivalents from Texas Instruments (SN74ACT240DWR, SN74ACT240NSR, CD74ACT240M96) provide continued design support with improved availability and regulatory compliance.

Q: Are all substitute parts ROHS3 compliant? A: CD74ACT240M96, SN74ACT240DWR, and SN74ACT240NSR are ROHS3 compliant. CD74ACT240M is RoHS non-compliant. For applications requiring RoHS compliance, use only the three Texas Instruments variants.

Q: What packaging options are available for substitution? A: Substitute parts are available in 20-SOIC (0.295" width) and 20-SO (0.209" width) surface mount packages. Both are mechanically and electrically compatible with the original 74ACTQ240SJX 20-SOP package within standard PCB design tolerances.