74HC240N Equivalent & Substitute Parts

Part Overview

The 74HC240N is a high-speed CMOS logic buffer with inverting functionality, manufactured by NXP USA Inc. This device features 2 elements with 4 bits per element and 3-state output capability, housed in a 20-DIP package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

74HC240N,652

NXP USA Inc.In Stock: 95774HC240N,652 Datasheet

Current PartRFQ

CD74HC240E

Texas InstrumentsIn Stock: 1590CD74HC240E Datasheet

UpgradeRFQ

CD74HC240M

Texas InstrumentsIn Stock: 1203CD74HC240M Datasheet

MFR RecommendedRFQ

SN74HC240N

Texas InstrumentsIn Stock: 2677SN74HC240N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74HC240N is determined by the following critical parameters:

• Base product number (74HC240) ensures functional equivalence
• Logic type (Buffer, Inverting) and configuration (2 elements, 4 bits per element, 3-state output)
• Output current specifications (7.8mA, 7.8mA)
• Supply voltage range (2V ~ 6V)
• Package compatibility (20-DIP or equivalent pinout)
• RoHS3 compliance and REACH unaffected status

Substitute parts are grouped into two categories: direct package equivalents (20-DIP through-hole) and alternative package options (20-SOIC surface mount). All substitutes maintain the core 74HC240 functionality and electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

CD74HC240E (Texas Instruments) is the primary direct substitute for through-hole applications. This part maintains identical package geometry (20-DIP), electrical specifications, and supply voltage range. Product status is active, ensuring long-term availability and supply chain stability. Operating temperature range extends to -55°C, providing enhanced low-temperature performance compared to the original part.

SN74HC240N (Texas Instruments) is an alternative through-hole substitute with active product status and ROHS3 compliance. Operating temperature range is -40°C ~ 85°C, matching the lower bound of the original part but with a reduced upper limit of 85°C versus 125°C. This part is suitable for applications not requiring the full 125°C upper temperature specification.

CD74HC240M (Texas Instruments) is the surface-mount alternative in 20-SOIC package. This part is designated as Last Time Buy, indicating limited future availability. Selection of this part requires board redesign for surface-mount assembly and is appropriate only when surface-mount technology is the design requirement. Operating temperature range extends to -55°C.

Frequently Asked Questions (FAQ)

Q: Can CD74HC240E directly replace 74HC240N in existing through-hole designs?

A: Yes. CD74HC240E maintains identical 20-DIP package dimensions, pinout, and electrical specifications. No board redesign is required. The part is manufactured by Texas Instruments and carries active product status.

Q: What is the difference between CD74HC240E and SN74HC240N?

A: Both are through-hole 20-DIP packages with active product status. CD74HC240E offers extended low-temperature operation (-55°C minimum) compared to SN74HC240N (-40°C minimum). SN74HC240N has a reduced upper operating temperature of 85°C versus the original specification of 125°C. Selection depends on application temperature requirements.

Q: Is CD74HC240M a suitable replacement for through-hole applications?

A: No. CD74HC240M uses 20-SOIC surface-mount packaging, requiring board redesign and assembly process changes. This part is appropriate only for new designs utilizing surface-mount technology. Product status is Last Time Buy, indicating limited future procurement availability.

Q: Are all substitute parts RoHS3 compliant?

A: CD74HC240E compliance status is not specified in available documentation. CD74HC240M and SN74HC240N are both ROHS3 compliant. Verify RoHS compliance requirements with your procurement or quality assurance department before final part selection.

Q: What are the key electrical parameters that determine substitutability?

A: The 74HC240 base product number, 2-element 4-bit inverting buffer configuration, 3-state output type, 7.8mA output current, and 2V ~ 6V supply voltage range are the primary electrical criteria. All listed substitutes meet these specifications.

Q: Can I use these parts interchangeably in my design?

A: Through-hole substitutes (CD74HC240E and SN74HC240N) are pin-compatible and electrically equivalent for existing 74HC240N designs. CD74HC240M requires board redesign due to different package type. Verify operating temperature and compliance requirements for your specific application before implementation.