74AHCT240D,112 Equivalent & Substitute Parts

Part Overview

The 74AHCT240D,112 is a logic buffer IC manufactured by Nexperia USA Inc., featuring inverting 2-element, 4-bit per element architecture with 3-state output capability. This component operates across a 4.5V to 5.5V supply voltage range and is housed in a 20-SO surface mount package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74AHCT240D,112
Manufacturer	Nexperia USA Inc.
Logic Type	Buffer, Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	8mA, 8mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74AHCT240D,112 is determined by strict equivalence across the following critical parameters:

Logic Type: Buffer, Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Current - Output High, Low: 8mA, 8mA
Voltage - Supply: 4.5V ~ 5.5V
Package / Case: 20-SOIC (0.295", 7.50mm Width)

Substitute parts are classified into two categories:

Direct Substitutes (Functionally Equivalent): Parts meeting all critical parameters with identical or superior operating temperature ranges and compliance certifications.

Parametric Equivalents (Functionally Compatible): Parts meeting all critical parameters with minor variations in product status or packaging designation that do not affect electrical performance in the specified application.

Parameter Comparison

Parameter	74AHCT240D,112 (Main)	MC74VHCT240ADWRG	SN74AHCT240DWR	SN74AHCT240DW
Manufacturer	Nexperia USA Inc.	onsemi	Texas Instruments	Texas Instruments
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting
Number of Elements	2	2	2	2
Number of Bits per Element	4	4	4	4
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete	Active	Active	Discontinued at DiGi Electronics
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SN74AHCT240DWR (Texas Instruments) is the primary recommended substitute. This part maintains identical electrical specifications, operating temperature range (-40°C ~ 125°C), and MSL rating (1 - Unlimited) as the original 74AHCT240D,112. Product status is active, ensuring long-term availability and supply chain stability. ROHS3 compliance is maintained.

SN74AHCT240DW (Texas Instruments) is a parametric equivalent offering identical electrical performance and operating temperature range. Product status is discontinued at DiGi Electronics, which may impact future procurement. This part is suitable for applications where existing inventory is available or where supply from alternative distributors is confirmed.

MC74VHCT240ADWRG (onsemi) meets all critical electrical parameters and maintains ROHS3 compliance with active product status. The operating temperature range is reduced to -40°C ~ 85°C, and MSL rating is 3 (168 Hours). This substitute is suitable for applications operating within the -40°C ~ 85°C temperature window and where moisture exposure is controlled to 168 hours or less.

Frequently Asked Questions (FAQ)

Q: Can the MC74VHCT240ADWRG replace the 74AHCT240D,112 in all applications?

A: The MC74VHCT240ADWRG is electrically equivalent for logic function and output drive capability. However, it has a reduced operating temperature range (-40°C ~ 85°C versus -40°C ~ 125°C) and higher moisture sensitivity (MSL 3 versus MSL 1). Use this substitute only in applications operating within -40°C ~ 85°C and where moisture exposure does not exceed 168 hours.

Q: What is the difference between SN74AHCT240DWR and SN74AHCT240DW?

A: Both parts are manufactured by Texas Instruments and are electrically identical with matching operating temperature ranges and MSL ratings. The primary difference is packaging designation: DWR indicates Tape & Reel packaging, while DW indicates standard packaging. SN74AHCT240DWR has active product status, while SN74AHCT240DW is discontinued at DiGi Electronics.

Q: Are all substitute parts pin-compatible with the original 74AHCT240D,112?

A: Yes. All substitute parts use the 20-SOIC (0.295", 7.50mm Width) package with identical pinout, ensuring direct PCB compatibility without layout modifications.

Q: Why is the 74AHCT240D,112 classified as obsolete?

A: Obsolescence is a manufacturer designation indicating the part is no longer in active production. Active substitutes from Texas Instruments and onsemi provide equivalent functionality with ongoing supply availability.

Q: Do all substitute parts maintain ROHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the original 74AHCT240D,112.

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