74ACTQ240SC Equivalent & Substitute Parts

Part Overview

The 74ACTQ240SC is a Buffer, Inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-SOIC package. This component operates across a 4.5V to 5.5V supply voltage range with output currents of 24mA for both high and low states, suitable for -40°C to 85°C operating environments.

The 74ACTQ240SC is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Key Parameters

Parameter	Value
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)
Package / Case	20-SOIC
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACTQ240SC is determined by strict equivalence 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)
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount

All identified substitute parts maintain these electrical and mechanical specifications. Variations in product status, packaging format (Tape & Reel, Cut Tape, Tube), manufacturer, and compliance certifications do not affect functional interchangeability within the specified parameter set.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Product Status
74ACTQ240SC	onsemi	Buffer, Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Obsolete
MC74ACT240DWR2G	onsemi	Buffer, Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active
MC74ACT240DWG	onsemi	Buffer, Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Obsolete
CD74ACT240M96	Texas Instruments	Buffer, Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active
SN74ACT240DWR	Texas Instruments	Buffer, Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active
SN74ACT240NSR	Texas Instruments	Buffer, Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active
CD74ACT240M	Harris Corporation	Buffer, Inverting	2	4	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Obsolete

Engineering Selection Recommendations

For new production applications, MC74ACT240DWR2G, CD74ACT240M96, SN74ACT240DWR, and SN74ACT240NSR are recommended as primary substitutes due to their Active product status and RoHS3 compliance. These parts ensure long-term availability and regulatory alignment.

MC74ACT240DWG and CD74ACT240M are classified as Obsolete and should be considered only for legacy system maintenance or when Active alternatives are unavailable. CD74ACT240M carries RoHS non-compliant status and may present regulatory constraints in certain applications.

All substitute parts maintain identical electrical performance and mechanical compatibility with the 74ACTQ240SC within the specified parameter envelope.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT240NSR be used as a direct replacement for 74ACTQ240SC?

A: SN74ACT240NSR is electrically equivalent across all critical parameters: logic type, element count, bit configuration, output type, current ratings, supply voltage, and operating temperature. The package designation differs slightly (20-SO versus 20-SOIC), but both represent the same 20-pin SOIC form factor with compatible pinouts and mechanical dimensions for surface mount assembly.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel and Cut Tape are packaging and delivery formats that do not affect component functionality. Tape & Reel provides continuous reel packaging for automated assembly lines, while Cut Tape offers individual segments. Both formats contain identical components with the same electrical specifications.

Q: Why are some substitute parts listed as Obsolete?

A: Obsolete parts remain functionally equivalent but are no longer in active production. They may be available from existing inventory but offer no guarantee of future availability. For new designs and production runs, Active status parts are preferred to ensure supply chain continuity.

Q: Are there compliance differences between substitute parts?

A: Yes. MC74ACT240DWR2G, CD74ACT240M96, SN74ACT240DWR, and SN74ACT240NSR are RoHS3 compliant. CD74ACT240M is RoHS non-compliant. The 74ACTQ240SC and MC74ACT240DWG do not specify RoHS status in the provided data. Compliance requirements should be verified against your application and regional regulations.

Q: Can I substitute based on manufacturer alone?

A: No. Substitution must be based on the complete parameter set: logic type, element count, bit configuration, output type, current ratings, supply voltage, operating temperature, and package form factor. Manufacturer differences do not affect functional interchangeability when all electrical and mechanical parameters are equivalent.

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