74VHC240M Equivalent & Substitute Parts

Part Overview

The 74VHC240M 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 2V to 5.5V supply voltage range and is housed in a 20-SOIC package. The part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design requirements and production continuity.

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	2V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the 74VHC240M is determined by strict equivalence across the following parameters: logic type (Buffer, Inverting), number of elements (2), bits per element (4), output type (3-state), output current specifications (8mA, 8mA), supply voltage range (2V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and package type (20-SOIC with 0.295" width).

Substitute parts are grouped into three categories:

Direct Manufacturer Substitutes maintain identical electrical and mechanical specifications with the same 20-SOIC package footprint (0.295" width). These parts are pin-compatible and functionally equivalent.

Similar Substitutes meet all electrical specifications but use a narrower 20-SO package variant (0.209" width instead of 0.295"). While electrically compatible, PCB layout adjustments may be required due to package width differences.

Parametric Equivalents satisfy all core electrical parameters and use the standard 20-SOIC package but may have different product status or availability classifications.

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Voltage (V)	Temp Range (°C)	Package	Product Status
74VHC240M	onsemi	74VHC	Buffer, Inverting	2	4	3-State	8, 8	2 ~ 5.5	-40 ~ 85	20-SOIC (0.295")	Obsolete
MC74VHC240DWR2G	onsemi	74VHC	Buffer, Inverting	2	4	3-State	8, 8	2 ~ 5.5	-40 ~ 85	20-SOIC (0.295")	Active
SN74AHC240DWR	Texas Instruments	74AHC	Buffer, Inverting	2	4	3-State	8, 8	2 ~ 5.5	-40 ~ 85	20-SOIC (0.295")	Active
SN74AHC240NSR	Texas Instruments	74AHC	Buffer, Inverting	2	4	3-State	8, 8	2 ~ 5.5	-40 ~ 85	20-SO (0.209")	Active
SN74AHC240DW	Texas Instruments	74AHC	Buffer, Inverting	2	4	3-State	8, 8	2 ~ 5.5	-40 ~ 85	20-SOIC (0.295")	Discontinued at DiGi Electronics

Engineering Selection Recommendations

MC74VHC240DWR2G is the primary direct substitute. Manufactured by onsemi in the same 74VHC series, it maintains identical electrical specifications and 20-SOIC package dimensions. This part is currently active and available in higher inventory quantities (1847 pcs), providing supply continuity. RoHS3 compliance is confirmed.

SN74AHC240DWR is a cross-manufacturer direct substitute from Texas Instruments. It provides identical electrical and mechanical specifications with the same 20-SOIC package footprint. This part is active and maintains the highest inventory availability (3400 pcs). RoHS3 compliance is confirmed.

SN74AHC240DW is a parametric equivalent from Texas Instruments with identical electrical specifications and 20-SOIC package. However, this part is discontinued at DiGi Electronics, limiting long-term availability for new designs.

SN74AHC240NSR is a similar substitute from Texas Instruments with all electrical parameters matching the original part. The package is a narrower 20-SO variant (0.209" width versus 0.295"), requiring PCB layout verification before implementation. This part is active with confirmed RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can MC74VHC240DWR2G be used as a direct replacement for 74VHC240M?

A: Yes. MC74VHC240DWR2G is a direct substitute with identical logic type, element count, bit configuration, output type, current ratings, supply voltage range, operating temperature, and 20-SOIC package dimensions. No circuit modifications are required.

Q: What is the difference between SN74AHC240DWR and SN74AHC240NSR?

A: Both parts are electrically identical with matching logic specifications and current ratings. The primary difference is the package: SN74AHC240DWR uses a standard 20-SOIC package (0.295" width), while SN74AHC240NSR uses a narrower 20-SO package (0.209" width). PCB footprint compatibility must be verified before selecting SN74AHC240NSR.

Q: Why is the 74VHC240M listed as obsolete?

A: The 74VHC240M is no longer in active production. Active equivalents from onsemi (MC74VHC240DWR2G) and Texas Instruments (SN74AHC240DWR, SN74AHC240DW) are available to support ongoing applications.

Q: Are all substitute parts RoHS compliant?

A: MC74VHC240DWR2G, SN74AHC240DWR, SN74AHC240NSR, and SN74AHC240DW are all RoHS3 compliant. All parts maintain REACH Unaffected status.

Q: Which substitute offers the best long-term availability?

A: SN74AHC240DWR from Texas Instruments currently has the highest inventory (3400 pcs) and active product status, providing optimal supply continuity for new designs.

Q: Can SN74AHC240DW be used for new production designs?

A: SN74AHC240DW is discontinued at DiGi Electronics, making it unsuitable for new production designs requiring long-term component availability. Use SN74AHC240DWR or MC74VHC240DWR2G instead.

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