CD74HCT240EG4 Equivalent & Substitute Parts

Part Overview

The CD74HCT240EG4 is a logic buffer integrated circuit manufactured by Texas Instruments, classified as an inverting buffer with 2 elements and 4 bits per element. The device features 3-state output capability and operates across a supply voltage range of 4.5V to 5.5V. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and component procurement.

Substiute Parts

CD74HCT240EG4

Texas InstrumentsIn Stock: 849CD74HCT240EG4 Datasheet

Current PartRFQ

CD74HCT240E

Harris CorporationIn Stock: 50242CD74HCT240E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74HCT240EG4 is determined by strict equivalence across the following electrical and mechanical parameters:

• Logic type and functional configuration (inverting buffer, 2 elements, 4 bits per element)
• Output architecture (3-state capability)
• Output current specifications (6mA high and low)
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (-55°C ~ 125°C)
• Physical package format (20-DIP, 0.300" pitch, 7.62mm)
• Through-hole mounting compatibility

The CD74HCT240E from Harris Corporation meets all specified electrical and mechanical parameters and qualifies as a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT240E is electrically and mechanically equivalent to the CD74HCT240EG4. Selection between these parts should be based on product status and compliance requirements:

The CD74HCT240EG4 (Texas Instruments) carries ROHS3 compliance and REACH unaffected status. The CD74HCT240E (Harris Corporation) is RoHS non-compliant and carries obsolete product status. For applications requiring RoHS3 compliance and current product support, the CD74HCT240EG4 remains the preferred selection where available. For legacy system maintenance or applications without RoHS compliance requirements, the CD74HCT240E provides functional equivalence with established inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT240E directly replace the CD74HCT240EG4 in existing designs?

A: Yes. Both parts share identical electrical specifications (logic type, output configuration, current ratings, supply voltage, and operating temperature) and physical packaging (20-DIP through-hole). Direct pin-for-pin substitution is supported.

Q: What is the primary difference between these parts?

A: The CD74HCT240EG4 is manufactured by Texas Instruments with ROHS3 compliance and current product status. The CD74HCT240E is manufactured by Harris Corporation, is RoHS non-compliant, and carries obsolete status. Electrical and mechanical specifications are identical.

Q: Are there any package or mounting considerations for substitution?

A: Both parts use identical 20-DIP (0.300", 7.62mm) through-hole packaging. No PCB layout or mounting modifications are required for substitution.

Q: Which part should be selected for new designs?

A: For new designs, the CD74HCT240EG4 is recommended due to ROHS3 compliance and active product status. The CD74HCT240E is suitable for legacy system maintenance or applications without RoHS compliance requirements.