74AHCT240D-Q100J Equivalent & Substitute Parts

Part Overview

The 74AHCT240D-Q100J is an inverting buffer logic IC manufactured by Nexperia USA Inc., designed for 5.5V operation with 2 elements and 4 bits per element configuration. This device features 3-state output capability and is qualified to AEC-Q100 automotive standards. The part is currently active in production with 811 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility permits selection from multiple qualified manufacturers offering identical electrical and mechanical performance.

Substiute Parts

74AHCT240D-Q100J

Nexperia USA Inc.In Stock: 89674AHCT240D-Q100J Datasheet

Current PartRFQ

MC74VHCT240ADWRG

onsemiIn Stock: 1265MC74VHCT240ADWRG Datasheet

SimilarRFQ

SN74AHCT240DW

Texas InstrumentsIn Stock: 1084SN74AHCT240DW Datasheet

SimilarRFQ

SN74AHCT240DWR

Texas InstrumentsIn Stock: 1683SN74AHCT240DWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74AHCT240D-Q100J is determined by strict equivalence across the following critical parameters:

Logic configuration: Buffer, Inverting topology with 2 elements and 4 bits per element Output characteristics: 3-state output with 8mA drive capability (high and low) Electrical performance: 4.5V to 5.5V supply voltage range and 8mA output current specifications Package compatibility: 20-SOIC surface mount package with 0.295" (7.50mm) width Environmental rating: Operating temperature range of -40°C to 125°C

Substitute parts must maintain identical electrical specifications and physical package dimensions to ensure direct replacement capability without circuit redesign or PCB modification.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts meet the core electrical and mechanical requirements for direct replacement of the 74AHCT240D-Q100J. Selection should be based on the following criteria:

SN74AHCT240DWR (Texas Instruments) is the primary parametric equivalent, offering identical operating temperature range (-40°C to 125°C), MSL rating of 1 (Unlimited), and active product status. This part provides the highest compatibility margin and is recommended for new designs and production applications.

SN74AHCT240DW (Texas Instruments) maintains identical electrical specifications and temperature range but carries a discontinued status at DiGi Electronics. This part is suitable only for legacy system maintenance or when existing inventory is available through alternative distribution channels.

MC74VHCT240ADWRG (onsemi) provides full electrical equivalence with identical output current and supply voltage specifications. The operating temperature range is limited to -40°C to 85°C, which is acceptable for applications not requiring the full -40°C to 125°C range. The MSL rating of 3 (168 Hours) requires stricter moisture control during storage and handling compared to MSL 1 rated alternatives.

All parts carry ROHS3 compliance and EAR99 export classification, meeting standard regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can MC74VHCT240ADWRG be used in applications requiring -40°C to 125°C operation?

A: No. The MC74VHCT240ADWRG is rated only to -40°C to 85°C. Applications requiring the full -40°C to 125°C temperature range must use SN74AHCT240DWR or the original 74AHCT240D-Q100J.

Q: What is the significance of the MSL rating difference between parts?

A: MSL 1 (Unlimited) allows indefinite storage without moisture baking requirements. MSL 3 (168 Hours) requires moisture baking if the part has been exposed to ambient conditions for more than 168 hours. For high-volume production, MSL 1 rated parts reduce handling complexity.

Q: Are all substitute parts in the same package?

A: Yes. All parts use the 20-SOIC package with 0.295" (7.50mm) width, enabling direct PCB footprint compatibility without layout modifications.

Q: Why is SN74AHCT240DW marked as discontinued?

A: The part is discontinued at DiGi Electronics but may remain available through other authorized distributors. For new production designs, SN74AHCT240DWR is the recommended alternative from Texas Instruments.

Q: Do all parts meet automotive qualification standards?

A: The 74AHCT240D-Q100J carries AEC-Q100 automotive qualification. The substitute parts do not list explicit AEC-Q100 qualification in the provided specifications. Automotive applications requiring AEC-Q100 certification should confirm qualification status with the respective manufacturers before selection.

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

A: Both series provide identical logic functionality and electrical performance for this buffer application. The 74VHCT series (onsemi) operates to 85°C maximum, while 74AHCT series (Nexperia, Texas Instruments) extends to 125°C. Series selection depends on application temperature requirements.