74FCT240ATQG Equivalent & Substitute Parts

Part Overview

The 74FCT240ATQG is a Buffer, Inverting logic IC manufactured by Renesas Electronics Corporation, featuring 2 elements with 4 bits per element and 3-state output capability. This component operates within the 4.75V to 5.25V supply voltage range and is housed in a 20-QSOP package suitable for surface mount applications. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and procurement planning.

Substiute Parts

74FCT240ATQG

Renesas Electronics CorporationIn Stock: 106674FCT240ATQG Datasheet

Current PartRFQ

CY74FCT2240CTQCT

Texas InstrumentsIn Stock: 3322CY74FCT2240CTQCT Datasheet

MFR RecommendedRFQ

CY74FCT240ATQCT

Texas InstrumentsIn Stock: 5660CY74FCT240ATQCT Datasheet

MFR RecommendedRFQ

CY74FCT240TQCT

Cypress Semiconductor CorpIn Stock: 4179CY74FCT240TQCT Datasheet

MFR RecommendedRFQ

74FCT240CTQG

Renesas Electronics CorporationIn Stock: 190674FCT240CTQG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74FCT240ATQG are classified based on strict adherence to the following critical parameters:

Core Substitution Criteria:

• Logic Type: Buffer, Inverting
• Number of Elements: 2
• Number of Bits per Element: 4
• Output Type: 3-State
• Voltage - Supply: 4.75V ~ 5.25V
• Operating Temperature: -40°C ~ 85°C (TA)
• Package / Case: 20-SSOP (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

Substitution Categories:

MFR Recommended Substitutes are active production parts from alternative manufacturers that maintain full electrical and mechanical compatibility with the original specification.

Parametric Equivalents are parts from the same manufacturer series that share identical electrical characteristics and package specifications but may differ in product status or packaging format.

Parameter Comparison

Engineering Selection Recommendations

For Active Production Designs:

CY74FCT240ATQCT (Texas Instruments) and CY74FCT240TQCT (Cypress Semiconductor) are preferred selections. Both maintain active product status, ensuring long-term availability and supply chain stability. CY74FCT240ATQCT provides output current specifications identical to the original 74FCT240ATQG (15mA high, 64mA low), while CY74FCT240TQCT offers elevated output current capability (32mA high, 64mA low). Both are ROHS3 compliant with MSL rating of 2 (1 Year).

CY74FCT2240CTQCT (Texas Instruments) is functionally equivalent with identical supply voltage and operating temperature range. This part exhibits reduced output low current (12mA versus 64mA), which may impact applications requiring maximum sink current capability.

For Legacy System Support:

74FCT240CTQG (Renesas Electronics) serves as a parametric equivalent for systems requiring component continuity within the original manufacturer's product line. This part maintains identical electrical specifications and MSL rating (1, Unlimited) to the original 74FCT240ATQG, though both are classified as obsolete. Packaging format differs (Tube versus QSOP), requiring verification of procurement and handling compatibility.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT240ATQCT directly replace 74FCT240ATQG in existing designs?

A: Yes. CY74FCT240ATQCT maintains identical output current specifications (15mA high, 64mA low), supply voltage range (4.75V ~ 5.25V), operating temperature range (-40°C ~ 85°C), and 20-SSOP package footprint. Both are 3-state inverting buffers with 2 elements and 4 bits per element. The primary difference is product status (active versus obsolete) and MSL rating (2 versus 1).

Q: What is the significance of the output current differences between substitute parts?

A: Output current specifications define the maximum current the IC can source (high) or sink (low) at its outputs. The original 74FCT240ATQG specifies 15mA high and 64mA low. CY74FCT240ATQCT matches these specifications exactly. CY74FCT240TQCT and CY74FCT240ATQCT offer 32mA high output, providing greater source capability. CY74FCT2240CTQCT reduces output low current to 12mA. Selection depends on the load current requirements of the driven circuitry.

Q: Are all substitute parts ROHS3 compliant?

A: CY74FCT240ATQCT, CY74FCT2240CTQCT, and 74FCT240CTQG are explicitly ROHS3 compliant. CY74FCT240TQCT does not specify RoHS status in the provided data.

Q: What packaging formats are available?

A: The original 74FCT240ATQG is supplied in 20-QSOP format. Substitute parts are available in 20-SSOP (CY74FCT240ATQCT, CY74FCT2240CTQCT, CY74FCT240TQCT) or 20-QSOP (74FCT240CTQG). Both package types maintain identical 0.154" (3.90mm) width and surface mount compatibility. Verify PCB footprint compatibility before selection.

Q: Why is product status relevant for component selection?

A: Active production parts (CY74FCT240ATQCT, CY74FCT240TQCT, CY74FCT2240CTQCT) ensure continued availability, consistent manufacturing processes, and manufacturer support. Obsolete parts (74FCT240ATQG, 74FCT240CTQG) may face supply constraints and are suitable only for legacy system maintenance where design changes are not feasible.

Q: What does MSL rating indicate?

A: Moisture Sensitivity Level (MSL) specifies the maximum time a component can be exposed to ambient conditions before soldering. MSL 1 (Unlimited) allows indefinite storage without special handling. MSL 2 (1 Year) requires controlled storage and handling within one year of manufacture. The original 74FCT240ATQG has MSL 1; active substitutes have MSL 2, requiring adherence to moisture control procedures during assembly.