SN74HCT240APW Equivalent & Substitute Parts

Part Overview

The SN74HCT240APW is a Buffer, Inverting logic integrated circuit manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This device operates within the 74HCT logic series and is packaged in a 20-TSSOP surface mount configuration. The main part is currently in Last Time Buy status, indicating discontinued production. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications requiring this specific logic function.

Substiute Parts

SN74HCT240APW

Texas InstrumentsIn Stock: 730SN74HCT240APW Datasheet

Current PartRFQ

SN74HCT240APWR

Texas InstrumentsIn Stock: 3921SN74HCT240APWR Datasheet

Parametric EquivalentRFQ

SN74HCT240PWT

Texas InstrumentsIn Stock: 1408SN74HCT240PWT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74HCT240APW are determined by strict equivalence across the following critical parameters:

Substitution Criteria:

• Logic Type: Buffer, Inverting (identical function)
• Number of Elements: 2 (identical configuration)
• Number of Bits per Element: 4 (identical bit width)
• Output Type: 3-State (identical output capability)
• Current - Output High, Low: 6mA, 6mA (identical drive capability)
• Voltage - Supply: 4.5V ~ 5.5V (identical supply range)
• Operating Temperature: -40°C ~ 85°C (TA) (identical thermal range)
• Package / Case: 20-TSSOP (identical physical form factor)
• Mounting Type: Surface Mount (identical mounting method)
• Series: 74HCT (identical logic family)
• RoHS Status: ROHS3 Compliant (identical compliance)
• Moisture Sensitivity Level: 1 (Unlimited) (identical MSL rating)

All identified substitute parts maintain complete parametric equivalence across these dimensions, ensuring direct functional and physical interchangeability within the specified electrical and environmental operating conditions.

Parameter Comparison

Engineering Selection Recommendations

SN74HCT240APWR is the primary recommended substitute for the SN74HCT240APW. This part maintains identical electrical and mechanical specifications while offering Active product status, indicating ongoing manufacturer support and availability. With 3862 units in stock, this part provides superior supply chain continuity compared to the Last Time Buy status of the original part. Both parts are ROHS3 compliant with MSL 1 rating, ensuring equivalent environmental and regulatory compliance.

SN74HCT240PWT is a secondary equivalent option, offering identical parametric specifications and ROHS3 compliance. However, this part is marked as Discontinued at DiGi Electronics, which may limit future availability. The Tape & Reel packaging format differs from standard packaging, requiring consideration of assembly process compatibility. With 1309 units currently in stock, this part remains available for immediate procurement but should be evaluated against long-term supply requirements.

For new designs or long-term production commitments, SN74HCT240APWR is the preferred selection due to Active product status. For existing inventory management or short-term requirements, SN74HCT240PWT remains functionally equivalent but requires verification of packaging compatibility with existing assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT240APWR be used as a direct replacement for SN74HCT240APW?

A: Yes. Both parts are parametrically equivalent across all critical specifications: logic type, element count, bit width, output type, drive current, supply voltage, operating temperature range, package form factor, and compliance ratings. Direct substitution is supported without circuit modification.

Q: What is the difference between SN74HCT240APW and SN74HCT240PWT?

A: The primary difference is packaging format. SN74HCT240APW uses standard packaging, while SN74HCT240PWT is supplied in Tape & Reel (TR) format. All electrical and mechanical parameters are identical. Tape & Reel packaging is typically used for high-volume automated assembly processes. Verify your assembly equipment compatibility before selecting the Tape & Reel variant.

Q: Why is SN74HCT240APW marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this specific part number. This status necessitates identifying equivalent alternatives for continued supply. SN74HCT240APWR, with Active status, is the recommended long-term alternative.

Q: Are all three parts ROHS3 compliant?

A: Yes. SN74HCT240APW, SN74HCT240APWR, and SN74HCT240PWT are all ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), meeting equivalent environmental and regulatory requirements.

Q: Which substitute part offers the best supply availability?

A: SN74HCT240APWR offers the highest current inventory (3862 units) and Active product status, providing superior long-term supply reliability. This part is the recommended choice for new designs and ongoing production requirements.

Q: Can I mix SN74HCT240APW and SN74HCT240APWR in the same production batch?

A: Yes. Both parts are parametrically equivalent and can be used interchangeably within the same circuit design and production batch without functional or performance differences.

Q: What is the significance of the MSL 1 rating?

A: Moisture Sensitivity Level 1 (Unlimited) indicates the lowest moisture sensitivity classification. These parts have unlimited shelf life under normal storage conditions and do not require special moisture control measures during handling, storage, or assembly.