74VHCT240AMX Equivalent & Substitute Parts

Part Overview

The 74VHCT240AMX is a logic buffer IC manufactured by onsemi, 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-SOIC package. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations.

Substiute Parts

74VHCT240AMX

onsemiIn Stock: 84874VHCT240AMX Datasheet

Current PartRFQ

MC74VHCT240ADWRG

onsemiIn Stock: 1265MC74VHCT240ADWRG Datasheet

Parametric EquivalentRFQ

SN74AHCT240DW

Texas InstrumentsIn Stock: 1084SN74AHCT240DW Datasheet

SimilarRFQ

SN74AHCT240DWR

Texas InstrumentsIn Stock: 1683SN74AHCT240DWR Datasheet

SimilarRFQ

SN74AHCT240NSR

Texas InstrumentsIn Stock: 1971SN74AHCT240NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74VHCT240AMX is determined by 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 or compatible pinout
• Mounting Type: Surface Mount

Substitute parts must maintain identical electrical specifications across these parameters. The 74VHCT series from onsemi and the 74AHCT series from Texas Instruments share the same functional architecture and electrical characteristics, enabling direct substitution within the specified voltage and current ranges.

Parameter Comparison

Engineering Selection Recommendations

MC74VHCT240ADWRG is the primary parametric equivalent, manufactured by onsemi with identical electrical specifications and package dimensions. This part maintains active product status and ROHS3 compliance, providing the most direct replacement path for the obsolete 74VHCT240AMX.

SN74AHCT240DWR and SN74AHCT240DW from Texas Instruments are functionally equivalent alternatives. Both maintain identical electrical parameters and 20-SOIC packaging. SN74AHCT240DWR is currently active with tape and reel packaging, while SN74AHCT240DW is discontinued at DiGi Electronics. Both offer extended operating temperature range (-40°C to 125°C) compared to the original part.

SN74AHCT240NSR is functionally equivalent but uses a narrower 20-SO package (0.209", 5.30mm width) versus the standard 20-SOIC (0.295", 7.50mm width). This package difference requires PCB layout verification before implementation.

Frequently Asked Questions (FAQ)

Q: Can MC74VHCT240ADWRG directly replace 74VHCT240AMX?

A: Yes. MC74VHCT240ADWRG is a parametric equivalent with identical logic type, element count, bit configuration, output type, current ratings, supply voltage, and package dimensions. The primary difference is product status (active versus obsolete) and packaging format (tape and reel).

Q: What is the difference between 74VHCT and 74AHCT series?

A: Both series share identical electrical specifications for this buffer configuration. The primary distinction is manufacturer: 74VHCT is onsemi, while 74AHCT is Texas Instruments. Operating temperature ranges differ slightly (74VHCT: -40°C to 85°C; 74AHCT: -40°C to 125°C).

Q: Is SN74AHCT240NSR compatible with designs using 74VHCT240AMX?

A: SN74AHCT240NSR maintains identical electrical specifications and pinout but uses a narrower 20-SO package (5.30mm width) instead of the standard 20-SOIC (7.50mm width). PCB footprint compatibility must be verified before substitution.

Q: What does 3-State output mean?

A: 3-State output provides three output conditions: logic high, logic low, and high-impedance (disabled). This allows multiple devices to share a common bus without contention.

Q: Are all substitute parts RoHS3 compliant?

A: MC74VHCT240ADWRG, SN74AHCT240DW, SN74AHCT240DWR, and SN74AHCT240NSR are all ROHS3 compliant. The original 74VHCT240AMX RoHS status is not specified in available documentation.