74ACQ240SC Equivalent & Substitute Parts

Part Overview

The 74ACQ240SC is an inverting buffer 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 equivalent and substitute parts for ongoing design support and procurement continuity. The 74ACQ240SC operates across a 2V to 6V supply voltage range with 24mA output current capability and is housed in a 20-SOIC surface mount package.

Substiute Parts

74ACQ240SC

onsemiIn Stock: 80374ACQ240SC Datasheet

Current PartRFQ

MC74AC240DWR2G

onsemiIn Stock: 1040MC74AC240DWR2G Datasheet

SimilarRFQ

74AC240SC

Fairchild SemiconductorIn Stock: 310474AC240SC Datasheet

Parametric EquivalentRFQ

MC74AC240DWG

onsemiIn Stock: 1190MC74AC240DWG Datasheet

Parametric EquivalentRFQ

SN74AC240DWR

Texas InstrumentsIn Stock: 2789SN74AC240DWR Datasheet

DirectRFQ

CD74AC240M

Harris CorporationIn Stock: 23933CD74AC240M Datasheet

SimilarRFQ

CD74AC240M96

Texas InstrumentsIn Stock: 2194CD74AC240M96 Datasheet

SimilarRFQ

SN74AC240NSR

Texas InstrumentsIn Stock: 3433SN74AC240NSR Datasheet

SimilarRFQ

SN74AC240DW

Texas InstrumentsIn Stock: 1829SN74AC240DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACQ240SC is determined by the following critical parameters:

• Logic Function: Buffer, Inverting with 2 elements and 4 bits per element
• Output Configuration: 3-State output
• Output Current: 24mA minimum for both high and low states
• Supply Voltage Range: Minimum 2V to 6V compatibility
• Package Type: 20-SOIC surface mount form factor
• Operating Temperature: -40°C to 85°C range

Substitute parts are grouped into three categories based on parameter alignment:

Direct Substitutes (Identical electrical and mechanical parameters): Parts meeting all key parameters with active product status and current manufacturing support.

Parametric Equivalents (Matching electrical function with packaging variations): Parts with identical logic function and electrical specifications but different packaging or product status.

Similar Substitutes (Compatible with minor parameter deviations): Parts with equivalent logic function but variations in output current, supply voltage range, or package dimensions that remain functionally compatible within system constraints.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MC74AC240DWR2G (onsemi) is the optimal substitute for the 74ACQ240SC. This part maintains identical electrical specifications (24mA output current, 2V to 6V supply voltage) and package geometry (20-SOIC). The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating, ensuring long-term availability and regulatory alignment.

Secondary Recommendation: SN74AC240DWR (Texas Instruments) provides equivalent functionality with active product status and ROHS3 compliance. This part is supplied in Tape & Reel packaging, suitable for automated assembly processes. Electrical parameters are identical to the main part.

Alternative for Bulk Packaging: 74AC240SC (Fairchild Semiconductor) offers parametric equivalence with active product status and identical electrical specifications. This option is suitable for applications requiring bulk packaging format.

Extended Supply Voltage Range Option: CD74AC240M96 (Texas Instruments) supports a wider supply voltage range (1.5V to 5.5V) while maintaining 24mA output current and active product status. This part is applicable for designs requiring lower voltage operation.

Consideration for Obsolete Designs: MC74AC240DWG (onsemi) and SN74AC240DW (Texas Instruments) provide parametric equivalence but carry obsolete or discontinued status. These parts should be selected only when existing inventory is available and long-term procurement is not required.

Frequently Asked Questions (FAQ)

Q: Can MC74AC240DWR2G directly replace 74ACQ240SC in existing designs?

A: Yes. MC74AC240DWR2G maintains identical logic function, output current (24mA), supply voltage range (2V to 6V), and 20-SOIC package geometry. The primary difference is packaging format (Tape & Reel versus Bulk) and active product status, which improves procurement continuity.

Q: What is the difference between 20-SOIC and 20-SO packages?

A: Both are surface mount packages with 20 pins. The 20-SOIC (0.295" width) and 20-SO (0.209" width) differ in body width. SN74AC240NSR uses the narrower 20-SO package. PCB footprint compatibility must be verified before substitution.

Q: Are there output current differences between substitute options?

A: Most substitutes maintain 24mA output current matching the 74ACQ240SC. CD74AC240M provides higher output current (50mA) but carries obsolete status. CD74AC240M96 maintains 24mA output current with a wider supply voltage range (1.5V to 5.5V).

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

A: MC74AC240DWR2G (onsemi) and SN74AC240DWR (Texas Instruments) both carry active product status with ROHS3 compliance, ensuring sustained manufacturing support and regulatory compliance for new designs.

Q: Is the 74ACQ240SC supply voltage range compatible with all substitutes?

A: The 74ACQ240SC operates at 2V to 6V. Most substitutes support this range. CD74AC240M96 supports 1.5V to 5.5V, which is compatible but with a lower upper limit. Verify system voltage requirements before selection.

Q: What packaging options are available for automated assembly?

A: MC74AC240DWR2G, SN74AC240DWR, and CD74AC240M96 are supplied in Tape & Reel format, suitable for pick-and-place assembly. Bulk and Tube packaging options are available for manual or semi-automated processes.