74HCT240N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT240N,652 is a Buffer, Inverting logic IC manufactured by NXP USA Inc., featuring 2 elements with 4 bits per element and 3-state output capability in a 20-DIP package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device operates within a 4.5V to 5.5V supply voltage range and is suitable for applications requiring inverted buffering with tri-state output control.

Substiute Parts

74HCT240N,652

NXP USA Inc.In Stock: 77174HCT240N,652 Datasheet

Current PartRFQ

CD74HCT240E

Harris CorporationIn Stock: 50242CD74HCT240E Datasheet

DirectRFQ

SN74HCT240N

Texas InstrumentsIn Stock: 2211SN74HCT240N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HCT240N,652 are qualified based on the following criteria:

Electrical Compatibility:

• Identical logic type: Buffer, Inverting
• Matching element count: 2 elements
• Matching bits per element: 4 bits
• Identical output type: 3-State
• Matching output current specifications: 6mA high and low
• Identical supply voltage range: 4.5V ~ 5.5V
• Same base product number: 74HCT240

Mechanical Compatibility:

• Package type: 20-DIP (0.300", 7.62mm)
• Mounting type: Through Hole

Compliance Considerations:

• RoHS status and REACH compliance affect suitability for regulated applications
• Product status (active vs. obsolete) impacts long-term availability

Parameter Comparison

Engineering Selection Recommendations

SN74HCT240N (Texas Instruments) is the primary substitute for new designs and procurement. This part maintains full electrical and mechanical compatibility with the 74HCT240N,652, carries active product status ensuring long-term availability, and meets ROHS3 compliance requirements. The operating temperature range of -40°C to 85°C covers standard industrial applications, though it is narrower than the original part's -40°C to 125°C range.

CD74HCT240E (Harris Corporation) provides electrical and mechanical equivalence with an extended operating temperature range of -55°C to 125°C, making it suitable for extreme temperature environments. However, this part is obsolete and carries RoHS non-compliance status, limiting its use in regulated applications requiring environmental certifications.

Selection between these substitutes depends on application requirements: choose SN74HCT240N for compliance-driven and long-term availability needs, or CD74HCT240E only when extended temperature performance is critical and RoHS non-compliance is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT240E and SN74HCT240N be used interchangeably with the 74HCT240N,652?

A: Both parts are electrically and mechanically equivalent. They share identical logic function, element count, bit configuration, output type, current ratings, and supply voltage specifications. Direct substitution is possible from a functional standpoint. However, operating temperature ranges and compliance certifications differ and must be evaluated against specific application requirements.

Q: What is the difference in operating temperature ranges between these parts?

A: The 74HCT240N,652 and SN74HCT240N operate from -40°C to 125°C and -40°C to 85°C respectively. The CD74HCT240E extends to -55°C on the low end but only to 125°C on the high end. Applications requiring operation below -40°C or above 85°C must use the CD74HCT240E, though this part is obsolete.

Q: Are there compliance differences between these substitutes?

A: Yes. The 74HCT240N,652 and SN74HCT240N are both ROHS3 compliant. The CD74HCT240E is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, only the 74HCT240N,652 or SN74HCT240N are suitable.

Q: Why is the 74HCT240N,652 marked as obsolete?

A: Obsolete status indicates the part is no longer in active production by the manufacturer. The SN74HCT240N from Texas Instruments maintains active status and is the recommended long-term substitute for continued design support and procurement.

Q: Are the package dimensions identical across all three parts?

A: Yes. All three parts use the 20-DIP (0.300", 7.62mm) package with through-hole mounting. They are mechanically interchangeable on PCBs designed for this package type.

Q: What inventory considerations should guide part selection?

A: The CD74HCT240E has the highest inventory availability (50,200 pcs), followed by the 74HCT240N,652 (696 pcs), and SN74HCT240N (2,200 pcs). For immediate procurement needs, CD74HCT240E availability is highest, but compliance and obsolescence status should take priority in selection decisions.