SN74HC240APW Equivalent & Substitute Parts

Part Overview

The SN74HC240APW is a Buffer, Inverting logic integrated circuit manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This device is packaged in a 20-TSSOP surface mount configuration and operates across a 2V to 6V supply voltage range with an operating temperature range of -40°C to 85°C. The SN74HC240APW is currently designated as Last Time Buy, indicating limited availability and the necessity to identify equivalent substitute components for ongoing design requirements and production planning.

Substiute Parts

SN74HC240APW

Texas InstrumentsIn Stock: 1174SN74HC240APW Datasheet

Current PartRFQ

SN74HC240APWR

Texas InstrumentsIn Stock: 5022SN74HC240APWR Datasheet

Parametric EquivalentRFQ

SN74HC240PWT

Texas InstrumentsIn Stock: 1667SN74HC240PWT Datasheet

Parametric EquivalentRFQ

MM74HC240MTC

Fairchild SemiconductorIn Stock: 6554MM74HC240MTC Datasheet

Parametric EquivalentRFQ

MM74HC240MTC

Fairchild SemiconductorIn Stock: 6554MM74HC240MTC Datasheet

Parametric EquivalentRFQ

MM74HC240MTCX

Fairchild SemiconductorIn Stock: 3720MM74HC240MTCX Datasheet

Parametric EquivalentRFQ

SN74HC240PW

Texas InstrumentsIn Stock: 1297SN74HC240PW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HC240APW is determined by strict equivalence across the following critical parameters:

Functional Parameters:

• Logic Type: Buffer, Inverting
• Number of Elements: 2
• Number of Bits per Element: 4
• Output Type: 3-State

Electrical Parameters:

• Current - Output High, Low: 7.8mA, 7.8mA
• Voltage - Supply: 2V ~ 6V
• Operating Temperature: -40°C ~ 85°C (TA)

Physical Parameters:

• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP (0.173", 4.40mm Width)
• Base Product Number: 74HC240

All identified substitute parts maintain identical functional, electrical, and physical specifications. Variations exist only in packaging format (Tape & Reel, Tube, or Bulk), manufacturer (Texas Instruments or Fairchild Semiconductor), and product status. These packaging and availability differences do not affect electrical or mechanical compatibility in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74HC240APWR

The SN74HC240APWR is the optimal substitute for the SN74HC240APW. Both parts are manufactured by Texas Instruments and share identical electrical and mechanical specifications. The SN74HC240APWR is currently in Active product status with 4990 units in stock, providing superior availability compared to the Last Time Buy status of the original part. Both parts are ROHS3 compliant with MSL rating of 1 (Unlimited). The only difference is packaging format: SN74HC240APWR is supplied in Tape & Reel format, which is standard for high-volume production environments.

Secondary Recommendation: MM74HC240MTC (Fairchild Semiconductor)

The MM74HC240MTC provides a cross-manufacturer alternative with identical functional and electrical parameters. This part is manufactured by Fairchild Semiconductor and maintains Active product status with 6493 units in stock. The MM74HC240MTC is supplied in Bulk packaging format. This option is suitable for applications where manufacturer diversification is required or where Fairchild components are preferred in the supply chain.

Tertiary Recommendation: MM74HC240MTCX (Fairchild Semiconductor)

The MM74HC240MTCX is an additional Fairchild Semiconductor option with identical electrical specifications and Active product status. With 3700 units in stock, this part provides another cross-manufacturer alternative. Packaging format is not specified in the provided data.

Not Recommended for New Designs: SN74HC240PWT and SN74HC240PW

Both SN74HC240PWT and SN74HC240PW are designated as Discontinued at DiGi Electronics. While electrically equivalent, these parts should not be selected for new designs due to limited future availability.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC240APWR be used as a direct replacement for the SN74HC240APW?

A: Yes. The SN74HC240APWR is a direct electrical and mechanical equivalent. Both parts feature identical logic type (Buffer, Inverting), element configuration (2 elements, 4 bits per element), 3-state output, current ratings (7.8mA output high and low), supply voltage range (2V to 6V), operating temperature range (-40°C to 85°C), and 20-TSSOP package. The only difference is packaging format: SN74HC240APWR uses Tape & Reel format instead of Tube format.

Q: What is the difference between Texas Instruments and Fairchild Semiconductor versions?

A: The functional and electrical specifications are identical across both manufacturers. The 74HC240 logic family is a standardized industry design, and both Texas Instruments and Fairchild Semiconductor produce parts that meet the same electrical and mechanical requirements. Selection between manufacturers depends on supply chain preferences, inventory availability, and packaging format requirements.

Q: Are there any compatibility issues when switching from SN74HC240APW to MM74HC240MTC?

A: No compatibility issues exist. The MM74HC240MTC maintains identical electrical specifications, output characteristics, supply voltage range, operating temperature range, and 20-TSSOP package configuration. The cross-manufacturer substitution is valid for all circuit applications where the original part was used.

Q: What does "Last Time Buy" status mean for the SN74HC240APW?

A: Last Time Buy status indicates that Texas Instruments has announced the end of production for this specific part number. Existing inventory will be sold until depletion, after which the part will no longer be available. This status necessitates transition to an equivalent part number for continued production and future designs.

Q: Why is packaging format important when selecting a substitute?

A: Packaging format affects procurement, handling, and assembly processes. Tape & Reel format is optimized for automated pick-and-place assembly equipment used in high-volume production. Tube format is suitable for lower-volume manual assembly or prototyping. Bulk format is used for component distribution and kitting. The electrical and mechanical performance of the component is identical regardless of packaging format.

Q: Are all substitute parts ROHS3 compliant?

A: The Texas Instruments parts (SN74HC240APWR, SN74HC240PWT, SN74HC240PW) are explicitly listed as ROHS3 compliant. The Fairchild Semiconductor parts (MM74HC240MTC, MM74HC240MTCX) do not have RoHS status specified in the provided data. Verification of RoHS compliance status for Fairchild parts should be obtained from the manufacturer if RoHS certification is required for your application.

Q: What is the Moisture Sensitivity Level (MSL) rating?

A: The MSL rating of 1 (Unlimited) for the Texas Instruments parts indicates that these components have unlimited shelf life and do not require special moisture control during storage or handling. This is the least restrictive MSL classification and simplifies inventory management and logistics.