CD74HCT240EE4 Equivalent & Substitute Parts

Part Overview

The CD74HCT240EE4 is an 8-channel inverting buffer logic integrated circuit manufactured by Texas Instruments. This device functions as a 2-element, 4-bit-per-element inverter with 3-state output capability, operating within the 4.5V to 5.5V supply voltage range. The component is housed in a 20-pin DIP package and is classified as an active product with ROHS3 compliance. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the 74HCT logic series, particularly when the primary part experiences inventory constraints or when alternative sourcing is required for production continuity.

Substiute Parts

CD74HCT240EE4

Texas InstrumentsIn Stock: 705CD74HCT240EE4 Datasheet

Current PartRFQ

CD74HCT240E

Harris CorporationIn Stock: 50242CD74HCT240E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CD74HCT240EE4 are identified based on strict equivalence of the following critical parameters:

Electrical Equivalence Criteria:

• Logic type: Buffer, Inverting
• Number of elements: 2
• Number of bits per element: 4
• Output configuration: 3-State
• Output current specifications: 6mA (High), 6mA (Low)
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: -55°C ~ 125°C

Mechanical Equivalence Criteria:

• Package type: 20-DIP (0.300", 7.62mm)
• Mounting type: Through Hole
• Base product number: 74HCT240

The CD74HCT240E from Harris Corporation meets all electrical and mechanical equivalence parameters, confirming its status as a parametric equivalent. Substitution is valid when these parameters remain unchanged across the component selection.

Parameter Comparison

Engineering Selection Recommendations

CD74HCT240EE4 (Primary Selection): The CD74HCT240EE4 from Texas Instruments is the recommended primary selection. This component carries Active product status and maintains ROHS3 compliance, ensuring alignment with current environmental and regulatory standards. Current inventory of 688 pieces supports immediate availability for production requirements.

CD74HCT240E (Substitute Selection): The CD74HCT240E from Harris Corporation is a parametric equivalent suitable for substitution when the primary part is unavailable. This component meets all electrical and mechanical specifications required for direct functional replacement. However, the CD74HCT240E carries Obsolete product status and is RoHS non-compliant. Selection of this substitute should be limited to applications where regulatory compliance requirements do not apply or where legacy system maintenance is the primary objective. Inventory availability is significantly higher at 50,200 pieces, supporting high-volume legacy production scenarios.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT240E be used as a direct replacement for the CD74HCT240EE4?

A: Yes, the CD74HCT240E is a parametric equivalent. All electrical parameters (logic type, element count, bit configuration, output current, supply voltage, and operating temperature) are identical. Both components use the same 20-DIP package with through-hole mounting. Direct pin-for-pin substitution is valid from a functional standpoint.

Q: What are the key differences between these two parts?

A: The primary differences are product status and regulatory compliance. The CD74HCT240EE4 is Active and ROHS3 compliant, while the CD74HCT240E is Obsolete and RoHS non-compliant. Both parts are manufactured by different suppliers (Texas Instruments versus Harris Corporation) and carry different inventory levels.

Q: Are there any package or pinout differences?

A: No. Both components use identical 20-DIP (0.300", 7.62mm) packages with through-hole mounting. Pinout and physical dimensions are equivalent, confirming mechanical interchangeability.

Q: Which part should be selected for new designs?

A: The CD74HCT240EE4 from Texas Instruments is the appropriate selection for new designs. Active product status and ROHS3 compliance ensure long-term availability and regulatory alignment with current environmental standards.

Q: When is the CD74HCT240E appropriate for selection?

A: The CD74HCT240E is appropriate for legacy system maintenance, repair, or replacement scenarios where the original component is no longer available and regulatory compliance is not a constraint. The higher inventory level supports high-volume legacy production requirements.

Q: Do supply voltage and operating temperature ranges differ between these parts?

A: No. Both components operate within identical supply voltage ranges (4.5V ~ 5.5V) and temperature ranges (-55°C ~ 125°C). Electrical performance specifications are equivalent across these critical parameters.