74ABT2240CMSA Equivalent & Substitute Parts

Part Overview

The 74ABT2240CMSA is a logic buffer IC with inverting functionality, manufactured by onsemi in a 20-SSOP package. This device provides 2 elements with 4 bits per element and 3-state output capability, operating across a 4.5V to 5.5V supply range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ABT2240CMSA
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 / 15mA
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 74ABT2240CMSA is determined by the following critical parameters:

Logic Function: Buffer, Inverting with 2 elements and 4 bits per element
Output Configuration: 3-State output
Supply Voltage: 4.5V ~ 5.5V
Operating Temperature Range: -40°C ~ 85°C
Output Current Capability: Minimum 32mA high, 12mA low (Texas Instruments variants) or 32mA high, 64mA low (74ABT240 variants)
Package Options: 20-SSOP or 20-TSSOP form factors
Mounting Type: Surface Mount

Substitute parts are grouped into two categories:

74ABT2240 Series (Direct functional equivalents): SN74ABT2240ADBR, SN74ABT2240APW, SN74ABT2240APWR
74ABT240 Series (Enhanced output current capability): SN74ABT240ADB, SN74ABT240ADBR, SN74ABT240APW, SN74ABT240APWR

All substitutes maintain identical logic functionality, voltage specifications, and temperature range. Differences exist in output current ratings and package form factors.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements / Bits	Output Type	Current High / Low (mA)	Supply Voltage	Temp Range	Package	Status
74ABT2240CMSA	onsemi	Buffer, Inverting	2 / 4	3-State	32 / 15	4.5V ~ 5.5V	-40°C ~ 85°C	20-SSOP	Obsolete
SN74ABT2240ADBR	Texas Instruments	Buffer, Inverting	2 / 4	3-State	32 / 12	4.5V ~ 5.5V	-40°C ~ 85°C	20-SSOP	Active
SN74ABT2240APW	Texas Instruments	Buffer, Inverting	2 / 4	3-State	32 / 12	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	Active
SN74ABT2240APWR	Texas Instruments	Buffer, Inverting	2 / 4	3-State	32 / 12	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	Active
SN74ABT240ADB	Texas Instruments	Buffer, Inverting	2 / 4	3-State	32 / 64	4.5V ~ 5.5V	-40°C ~ 85°C	20-SSOP	Active
SN74ABT240ADBR	Texas Instruments	Buffer, Inverting	2 / 4	3-State	32 / 64	4.5V ~ 5.5V	-40°C ~ 85°C	20-SSOP	Active
SN74ABT240APW	Texas Instruments	Buffer, Inverting	2 / 4	3-State	32 / 64	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	Active
SN74ABT240APWR	Texas Instruments	Buffer, Inverting	2 / 4	3-State	32 / 64	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	Active

Engineering Selection Recommendations

For Direct Replacement (74ABT2240 Series)

SN74ABT2240ADBR and SN74ABT2240APW/APWR are active production parts from Texas Instruments with identical functional specifications to the 74ABT2240CMSA. These parts maintain the same output current characteristics (32mA high, 12mA low) and are ROHS3 compliant. Selection between these options depends on package preference: 20-SSOP for SN74ABT2240ADBR or 20-TSSOP for SN74ABT2240APW/APWR.

For Enhanced Output Current (74ABT240 Series)

SN74ABT240ADB, SN74ABT240ADBR, SN74ABT240APW, and SN74ABT240APWR provide increased output current capability (32mA high, 64mA low) while maintaining all other electrical and functional parameters. These parts are suitable for applications requiring higher drive capability and are ROHS3 compliant. Package selection follows the same logic: 20-SSOP or 20-TSSOP.

All substitute parts are active production items with unlimited moisture sensitivity level (MSL 1), ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT240 series parts directly replace the 74ABT2240CMSA?

A: Yes. The SN74ABT240 series maintains identical logic function, voltage specifications, and temperature range. The primary difference is increased output current capability (64mA low vs. 15mA low on the original). This enhancement is backward compatible for applications not requiring the original lower current specification.

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

A: Both are surface-mount packages with 20 pins. The 20-SSOP has a 0.209" (5.30mm) width, while the 20-TSSOP has a 0.173" (4.40mm) width. The TSSOP is a thinner, more compact variant. Package selection depends on PCB layout constraints and design requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All Texas Instruments substitute parts listed (SN74ABT2240 and SN74ABT240 series) are ROHS3 compliant, meeting current environmental regulations.

Q: What packaging options are available for procurement?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR), Tube, and Cut Tape (CT) with Digi-Reel. Selection depends on production volume and assembly requirements.

Q: Is the 74ABT2240CMSA still available?

A: The 74ABT2240CMSA is classified as obsolete. Texas Instruments active production equivalents should be used for new designs and ongoing procurement.

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