SN74ACT240DW Equivalent & Substitute Parts

Part Overview

The SN74ACT240DW is a Buffer, Inverting logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-SOIC package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74ACT240 series provides standard inverting buffer functionality suitable for bus driving and signal conditioning applications requiring 5V logic levels.

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 (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Base Product Number	74ACT240

Substitute Part Grouping Explanation

Substitution of the SN74ACT240DW is determined by strict equivalence across the following 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), Package type (20-SOIC), and Mounting Type (Surface Mount). All substitute parts listed maintain these electrical and mechanical specifications. Substitutes are grouped by manufacturer and product status to facilitate procurement decisions based on availability and compliance requirements.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Product Status	RoHS Status
SN74ACT240DW	Texas Instruments	Buffer, Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Discontinued	ROHS3 Compliant
SN74ACT240DWR	Texas Instruments	Buffer, Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active	ROHS3 Compliant
CD74ACT240M	Harris Corporation	Buffer, Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Obsolete	RoHS non-compliant
74ACT240SCX	Fairchild Semiconductor	Buffer, Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active	Not specified
MC74ACT240DWR2G	onsemi	Buffer, Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active	ROHS3 Compliant
MC74ACT240DWG	onsemi	Buffer, Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and active procurement, SN74ACT240DWR (Texas Instruments, Active status, ROHS3 Compliant) is the primary direct substitute, offering identical electrical specifications with current product availability. MC74ACT240DWR2G (onsemi, Active status, ROHS3 Compliant) provides an alternative from a different manufacturer with equivalent performance and compliance certification. Both parts maintain full electrical and mechanical compatibility with the original SN74ACT240DW specification.

For legacy system support where original part sourcing is required, CD74ACT240M (Harris Corporation) and MC74ACT240DWG (onsemi) remain available as parametric equivalents, though both carry obsolete product status. CD74ACT240M is RoHS non-compliant and should be evaluated against system compliance requirements. 74ACT240SCX (Fairchild Semiconductor, Active status) provides functional equivalence with current availability.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT240DWR directly replace SN74ACT240DW? A: Yes. SN74ACT240DWR is a direct substitute with identical electrical specifications, package type (20-SOIC), and functional characteristics. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tube) and active product status.

Q: What is the difference between the substitute parts from different manufacturers? A: All listed substitutes maintain identical logic type, element count, bit configuration, output type, current ratings, supply voltage, operating temperature range, and package specifications. Differences exist only in manufacturer identity, product status (Active/Obsolete/Discontinued), and compliance certifications (RoHS status).

Q: Are obsolete parts suitable for new designs? A: Obsolete parts (CD74ACT240M, MC74ACT240DWG) are not recommended for new designs due to limited availability and potential supply chain discontinuation. Active status parts (SN74ACT240DWR, MC74ACT240DWR2G, 74ACT240SCX) are preferred for ongoing production.

Q: Does packaging format affect electrical compatibility? A: No. Packaging format (Tube, Cut Tape, Tape & Reel) affects only procurement and handling logistics. All substitute parts in the 20-SOIC package are electrically and mechanically interchangeable on the PCB.

Q: What is the significance of RoHS compliance status? A: RoHS3 Compliant parts (SN74ACT240DWR, MC74ACT240DWR2G, MC74ACT240DWG) meet environmental and hazardous substance restrictions. CD74ACT240M is RoHS non-compliant and may not be acceptable for applications subject to RoHS regulations.

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