74ABT240CMSA Equivalent & Substitute Parts

Part Overview

The 74ABT240CMSA is an inverting buffer 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 range and is rated for -40°C to 85°C operating temperature. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ABT240CMSA
Manufacturer	onsemi
Logic Type	Buffer, Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	32mA, 64mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ABT240CMSA is determined by the following critical parameters:

Logic Function: Buffer, Inverting with 2 elements and 4 bits per element
Output Configuration: 3-State output
Electrical Specifications: 4.5V to 5.5V supply voltage, -40°C to 85°C operating temperature range
Output Current Capability: 32mA high, 64mA low
Package Compatibility: 20-SSOP or 20-TSSOP surface mount packages

Substitute parts are grouped into two categories based on package type:

Category 1: 20-SSOP Package (Direct Footprint Match)

SN74ABT240ADBR (Texas Instruments, Tape & Reel)
SN74ABT240APW (Texas Instruments, Tube)
SN74ABT240APWR (Texas Instruments, Tape & Reel)

Category 2: 20-TSSOP Package (Reduced Pitch Alternative)

SN74ABT2240ADBR (Texas Instruments, Tape & Reel)
SN74ABT2240APW (Texas Instruments, Tube)
SN74ABT2240APWR (Texas Instruments, Cut Tape & Digi-Reel)

All substitute parts maintain identical logic functionality, electrical performance, and thermal operating range as the original 74ABT240CMSA.

Parameter Comparison

Parameter	74ABT240CMSA (onsemi)	SN74ABT240ADBR (TI)	SN74ABT240APW (TI)	SN74ABT240APWR (TI)	SN74ABT2240ADBR (TI)	SN74ABT2240APW (TI)	SN74ABT2240APWR (TI)
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting
Number of Elements	2	2	2	2	2	2	2
Number of Bits per Element	4	4	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 12mA	32mA, 12mA	32mA, 12mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	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	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SSOP	20-SSOP	20-TSSOP	20-TSSOP	20-SSOP	20-TSSOP	20-TSSOP
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Footprint Replacement (20-SSOP Package):

Select SN74ABT240ADBR, SN74ABT240APW, or SN74ABT240APWR from Texas Instruments. These parts maintain identical output current specifications (32mA high, 64mA low) and 20-SSOP package dimensions as the original 74ABT240CMSA. All three variants are active products with ROHS3 compliance, providing long-term availability and regulatory support.

For Package-Flexible Designs (20-TSSOP Package):

The SN74ABT2240 series (SN74ABT2240ADBR, SN74ABT2240APW, SN74ABT2240APWR) offers functional equivalence with reduced output low current (12mA versus 64mA). These parts are suitable for applications where the lower output current specification does not impact circuit performance. The 20-TSSOP package provides a smaller footprint alternative.

Packaging Selection:

Tape & Reel (TR) packaging: SN74ABT240ADBR or SN74ABT2240ADBR for high-volume production
Tube packaging: SN74ABT240APW or SN74ABT2240APW for lower-volume or prototype applications
Cut Tape & Digi-Reel: SN74ABT240APWR or SN74ABT2240APWR for flexible procurement

All substitute parts are manufactured by Texas Instruments, an active supplier with established product support and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT2240 series parts replace 74ABT240CMSA directly?

A: Functional replacement is supported. The SN74ABT2240 series maintains identical logic function, element count, bit configuration, and 3-state output. However, output low current is reduced from 64mA to 12mA. Verify that your circuit design accommodates this lower current specification before substitution.

Q: What is the difference between 20-SSOP and 20-TSSOP packages?

A: Both packages contain 20 pins in surface mount configuration. The 20-SSOP has a 0.209" (5.30mm) width, while the 20-TSSOP has a 0.173" (4.40mm) width. The 20-TSSOP provides a smaller footprint. PCB layout and component placement must be verified for compatibility with the selected package.

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 and regulatory requirements.

Q: What packaging options are available for production quantities?

A: Tape & Reel (TR) packaging is standard for high-volume production runs. Tube packaging is available for lower quantities or prototype builds. Cut Tape & Digi-Reel provides intermediate volume flexibility.

Q: Is the 74ABT240CMSA still available from onsemi?

A: The 74ABT240CMSA is classified as obsolete. Texas Instruments SN74ABT240 series parts are active products with established supply chains and are recommended for new designs and ongoing production support.

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