74ACT240SJ Equivalent & Substitute Parts

Part Overview

The 74ACT240SJ 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 output current ratings of 24mA for both high and low states. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACT240SJ
Manufacturer	onsemi
Series	74ACT
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 (0.209", 5.30mm Width)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT240SJ is determined by the following critical parameters:

Logic Type: Buffer, Inverting (must match exactly)
Number of Elements: 2 (must match exactly)
Number of Bits per Element: 4 (must match exactly)
Output Type: 3-State (must match exactly)
Current - Output High, Low: 24mA, 24mA (must match exactly)
Voltage - Supply: 4.5V ~ 5.5V (must match exactly)
Operating Temperature: -40°C ~ 85°C (TA) (must match exactly)
Mounting Type: Surface Mount (must match exactly)
Series: 74ACT (must match exactly)

All substitute parts listed below meet these electrical and functional requirements. Package variations exist but do not affect electrical compatibility within the specified parameters.

Parameter Comparison

Parameter	74ACT240SJ (onsemi)	SN74ACT240NSR (TI)	CD74ACT240M (Harris)	CD74ACT240M96 (TI)	SN74ACT240DWR (TI)
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting
Number of Elements	2	2	2	2	2
Number of Bits per Element	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Series	74ACT	74ACT	74ACT	74ACT	74ACT
Product Status	Obsolete	Active	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring the 74ACT240SJ, the following substitute parts are electrically equivalent:

SN74ACT240NSR (Texas Instruments) - Active product status with ROHS3 compliance. Available in Tape & Reel packaging. Recommended for new designs and ongoing production requiring RoHS compliance.

SN74ACT240DWR (Texas Instruments) - Active product status with ROHS3 compliance. Available in Cut Tape and Digi-Reel packaging. Suitable for applications requiring flexible packaging options.

CD74ACT240M96 (Texas Instruments) - Active product status with ROHS3 compliance. Available in Tape & Reel packaging. Provides alternative sourcing from Texas Instruments with compliance certifications.

CD74ACT240M (Harris Corporation) - Obsolete product status with RoHS non-compliance. Suitable only for legacy system maintenance where RoHS compliance is not required.

Selection should prioritize active products with current compliance certifications for new designs and long-term availability assurance.

Frequently Asked Questions (FAQ)

Q: Are all listed substitute parts electrically interchangeable with the 74ACT240SJ?

A: Yes. All substitute parts share identical electrical specifications including logic type, element count, bit configuration, output type, current ratings, supply voltage range, and operating temperature range. Electrical functionality is equivalent.

Q: What are the package differences among substitute parts?

A: The 74ACT240SJ uses 20-SOIC packaging with 0.209" width (5.30mm). Substitute parts use either 20-SO (0.209", 5.30mm) or 20-SOIC (0.295", 7.50mm) packages. Package width differences may affect PCB layout considerations but do not impact electrical compatibility.

Q: Which substitute part should be selected for new designs?

A: SN74ACT240NSR or SN74ACT240DWR are recommended for new designs. Both are active products from Texas Instruments with ROHS3 compliance, ensuring long-term availability and regulatory compliance.

Q: Why is the 74ACT240SJ listed as obsolete?

A: The original onsemi part is classified as obsolete. Active equivalent alternatives from Texas Instruments ensure continued design support and component availability.

Q: Are there compliance differences between substitute parts?

A: Yes. SN74ACT240NSR, CD74ACT240M96, and SN74ACT240DWR are ROHS3 compliant. CD74ACT240M is RoHS non-compliant. Selection should align with application compliance requirements.

Q: Can the 74ACT240SJ be replaced in existing assemblies?

A: Yes, provided the substitute part's package dimensions are compatible with the PCB layout. The 20-SO package (0.209" width) is a direct footprint match. The 20-SOIC package (0.295" width) requires PCB layout verification before substitution.

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