74ABT240CSJX Equivalent & Substitute Parts

Part Overview

The 74ABT240CSJX 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 across a 4.5V to 5.5V supply voltage range and is rated for -40°C to 85°C operating temperature. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ABT240CSJX
Manufacturer	onsemi
Series	74ABT
Logic Type	Buffer, Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High	32mA
Current - Output Low	64mA
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74ABT240CSJX are identified based on the following critical parameters that determine functional and mechanical compatibility:

Core Electrical Parameters:

Logic Type: Buffer, Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: -40°C ~ 85°C (TA)

Mechanical Parameters:

Mounting Type: Surface Mount
Package / Case: 20-SOIC or 20-SO (0.209" or 0.295" width variants)

Output Current Specifications: Substitutes are grouped into two categories based on output current ratings:

Category A (Exact Match): Current - Output High/Low of 32mA/64mA
Category B (Reduced Output Current): Current - Output High/Low of 32mA/12mA

All substitute parts maintain the 74ABT series designation and are manufactured by Texas Instruments with active product status and RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current High/Low (mA)	Supply Voltage	Temp Range	Package	Product Status	RoHS Status
74ABT240CSJX	onsemi	Buffer, Inverting	2	4	3-State	32/64	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.209")	Obsolete	N/A
SN74ABT240ADWR	Texas Instruments	Buffer, Inverting	2	4	3-State	32/64	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Active	ROHS3 Compliant
SN74ABT240ADW	Texas Instruments	Buffer, Inverting	2	4	3-State	32/64	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Active	ROHS3 Compliant
SN74ABT240ANSR	Texas Instruments	Buffer, Inverting	2	4	3-State	32/64	4.5V ~ 5.5V	-40°C ~ 85°C	20-SO (0.209")	Active	ROHS3 Compliant
SN74ABT2240ADWR	Texas Instruments	Buffer, Inverting	2	4	3-State	32/12	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Active	ROHS3 Compliant
SN74ABT2240ADW	Texas Instruments	Buffer, Inverting	2	4	3-State	32/12	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.295")	Active	ROHS3 Compliant
SN74ABT2240ANSR	Texas Instruments	Buffer, Inverting	2	4	3-State	32/12	4.5V ~ 5.5V	-40°C ~ 85°C	20-SO (0.209")	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Exact Electrical Match):

SN74ABT240ADWR and SN74ABT240ADW are direct electrical equivalents with identical output current specifications (32mA/64mA). Both parts are manufactured by Texas Instruments with active product status and RoHS3 compliance. SN74ABT240ADWR offers the highest inventory availability (12,575 pcs) and is supplied in Cut Tape and Digi-Reel packaging. SN74ABT240ADW is supplied in Tube packaging with 2,470 pcs available.

SN74ABT240ANSR provides an exact electrical match with the original 74ABT240CSJX package width (0.209"), maintaining the same footprint while offering active product status and RoHS3 compliance. This part is supplied in Tape & Reel packaging with 16,100 pcs available.

Secondary Substitutes (Reduced Output Current):

SN74ABT2240ADWR, SN74ABT2240ADW, and SN74ABT2240ANSR are functionally equivalent but feature reduced output low current (12mA vs. 64mA). These parts are suitable for applications where the lower output current specification meets design requirements. All three maintain active product status and RoHS3 compliance. SN74ABT2240ADWR offers the highest inventory (5,400 pcs) in Tape & Reel packaging.

All substitute parts maintain the 74ABT series electrical characteristics, operating temperature range, and supply voltage specifications of the original component.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT2240 series parts replace SN74ABT240 series parts?

A: SN74ABT2240 parts are functionally equivalent but feature reduced output low current (12mA vs. 64mA). Substitution is valid only if your application does not require the higher 64mA output current specification. Verify your circuit's current requirements before selection.

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

A: Both are 20-pin surface mount packages with identical pin configurations. The primary difference is package width: 20-SOIC measures 0.295" (7.50mm) while 20-SO measures 0.209" (5.30mm). Verify your PCB footprint compatibility before selection.

Q: Are all Texas Instruments substitutes RoHS3 compliant?

A: Yes. All listed Texas Instruments substitute parts (SN74ABT240 and SN74ABT2240 series) are RoHS3 compliant, meeting current environmental regulations.

Q: What packaging options are available for the SN74ABT240ADWR?

A: SN74ABT240ADWR is supplied in Cut Tape (CT) & Digi-Reel® packaging, suitable for automated assembly processes.

Q: Does package width affect electrical performance?

A: No. Package width differences (0.209" vs. 0.295") are mechanical considerations only. Electrical performance and specifications remain identical across all substitute parts within the same series.

Q: Which substitute offers the best inventory availability?

A: SN74ABT240ADWR provides the highest inventory with 12,575 pcs available, followed by SN74ABT240ANSR with 16,100 pcs. Both are active products with immediate availability.

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