74VHCT240AM Equivalent & Substitute Parts

Part Overview

The 74VHCT240AM is a logic buffer integrated circuit manufactured by onsemi, classified as an inverting buffer with 2 elements and 4 bits per element. The device features 3-state output capability and operates within a 4.5V to 5.5V supply voltage range. The 74VHCT240AM is currently listed as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

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	8mA, 8mA
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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 74VHCT240AM 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 - Output High, Low: 8mA, 8mA
Voltage - Supply: 4.5V ~ 5.5V
Package / Case: 20-SOIC form factor
Mounting Type: Surface Mount

Substitute parts are grouped into two categories: direct manufacturer equivalents from onsemi and functionally similar parts from Texas Instruments. All listed substitutes maintain identical electrical specifications and package compatibility with the original 74VHCT240AM.

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Operating Temp	Package	Product Status
74VHCT240AM	onsemi	74VHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Obsolete
MC74VHCT240ADWRG	onsemi	74VHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active
SN74AHCT240DW	Texas Instruments	74AHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-SOIC	Discontinued at DiGi Electronics
SN74AHCT240DWR	Texas Instruments	74AHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-SOIC	Active
SN74AHCT240NSR	Texas Instruments	74AHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-SO	Active

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 74VHCT240AM, MC74VHCT240ADWRG is the primary substitute. This part is manufactured by onsemi, maintains identical electrical and thermal specifications, and carries active product status with ROHS3 compliance.

For applications where Texas Instruments components are preferred or specified, SN74AHCT240DWR is the recommended substitute. This part is currently active, ROHS3 compliant, and provides an extended operating temperature range (-40°C ~ 125°C) compared to the original device. The SN74AHCT240DWR is supplied in Tape & Reel packaging.

SN74AHCT240NSR offers an alternative package option (20-SO, 5.30mm width) while maintaining all electrical equivalence. This variant is suitable for applications where the narrower package footprint is beneficial.

SN74AHCT240DW is listed as discontinued at DiGi Electronics and should be considered only when existing inventory is available and long-term supply is not a requirement.

Frequently Asked Questions (FAQ)

Q: Can MC74VHCT240ADWRG be used as a direct replacement for 74VHCT240AM?

A: Yes. MC74VHCT240ADWRG maintains identical electrical specifications, output current ratings, supply voltage range, and package form factor. The primary difference is product status (active versus obsolete) and packaging format (Tape & Reel).

Q: What is the difference between the onsemi 74VHCT and Texas Instruments 74AHCT series substitutes?

A: Both series meet the electrical requirements of the original 74VHCT240AM. The 74AHCT variants from Texas Instruments provide an extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C). All other electrical parameters remain equivalent.

Q: Are there package differences between SN74AHCT240DWR and SN74AHCT240NSR?

A: Yes. SN74AHCT240DWR uses a 20-SOIC package (0.295", 7.50mm width), while SN74AHCT240NSR uses a 20-SO package (0.209", 5.30mm width). Both maintain electrical equivalence and surface mount compatibility. Package selection depends on PCB layout requirements.

Q: What does "3-State Output" mean for this buffer?

A: 3-State output refers to the output capability of the device: logic high, logic low, or high-impedance (disabled). This allows multiple devices to share a common bus without contention.

Q: Are all substitute parts RoHS compliant?

A: MC74VHCT240ADWRG, SN74AHCT240DW, SN74AHCT240DWR, and SN74AHCT240NSR are all ROHS3 compliant. The original 74VHCT240AM does not specify RoHS status.

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