SN74HCT240PWT Equivalent & Substitute Parts

Part Overview

The SN74HCT240PWT is a Buffer, Inverting logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-TSSOP surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The 74HCT240 base product line remains actively supported by multiple manufacturers, providing viable alternatives that maintain functional and electrical compatibility.

Substiute Parts

SN74HCT240PWT

Texas InstrumentsIn Stock: 1408SN74HCT240PWT Datasheet

Current PartRFQ

SN74HCT240PWR

Texas InstrumentsIn Stock: 65948SN74HCT240PWR Datasheet

Parametric EquivalentRFQ

74HCT08PW,118

Nexperia USA Inc.In Stock: 824374HCT08PW,118 Datasheet

MFR RecommendedRFQ

74HCT240PW,118

NXP USA Inc.In Stock: 313474HCT240PW,118 Datasheet

MFR RecommendedRFQ

74HCT240PW-Q100,11

Nexperia USA Inc.In Stock: 114374HCT240PW-Q100,11 Datasheet

MFR RecommendedRFQ

MM74HCT240MTCX

Fairchild SemiconductorIn Stock: 6770MM74HCT240MTCX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74HCT240PWT is determined by strict equivalence across the following critical parameters: Logic Type (Buffer, Inverting), Number of Elements (2), Number of Bits per Element (4), Output Type (3-State), Package Type (20-TSSOP), and Voltage Supply Range (4.5V ~ 5.5V). Parts meeting all these criteria are classified as parametric equivalents and can be directly substituted without circuit modification.

The substitute parts identified fall into two categories:

Parametric Equivalents maintain identical functional specifications and package footprint. These parts differ only in packaging format (Cut Tape vs. Tape & Reel) or manufacturer source, with no impact on circuit performance.

Functional Alternatives such as the 74HCT08PW represent different logic functions (AND Gate vs. Buffer) and are not direct substitutes. These are listed for reference only when system redesign is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SN74HCT240PWR (Texas Instruments)

The SN74HCT240PWR is the direct parametric equivalent to the SN74HCT240PWT, differing only in packaging format (Cut Tape & Digi-Reel vs. Tape & Reel). Both parts are manufactured by Texas Instruments, share identical electrical specifications, and maintain the same 20-TSSOP footprint. This part is currently active with high inventory availability (65,880 units), making it the preferred replacement for discontinued stock.

Secondary Substitutes: 74HCT240PW,118 (NXP USA Inc.) and 74HCT240PW-Q100,11 (Nexperia USA Inc.)

Both NXP and Nexperia variants maintain full parametric equivalence with extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C). The 74HCT240PW-Q100,11 includes AEC-Q100 automotive qualification, suitable for applications requiring automotive-grade components. All three alternatives are ROHS3 compliant and carry identical REACH and ECCN classifications.

Alternative Consideration: MM74HCT240MTCX (Fairchild Semiconductor)

The Fairchild variant exhibits slightly elevated output current specifications (7.2mA vs. 6mA), which may provide improved drive capability in current-limited applications. This part remains functionally compatible within the 74HCT240 family and maintains the same package footprint.

Non-Equivalent Reference: 74HCT08PW,118 (Nexperia USA Inc.)

The 74HCT08PW is a 4-channel AND gate with fundamentally different logic function and cannot serve as a direct substitute. This part is listed only for reference in applications where logic function redesign is permissible.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT240PWR be used as a direct replacement for SN74HCT240PWT?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, logic function, and 20-TSSOP package footprint. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tape & Reel), which does not affect circuit performance or PCB assembly compatibility.

Q: What is the significance of the extended temperature range in the NXP and Nexperia variants?

A: The extended operating range (-40°C ~ 125°C) provides additional thermal margin compared to the original specification (-40°C ~ 85°C). This is beneficial for applications in high-temperature environments but is not required for standard industrial applications operating within -40°C ~ 85°C.

Q: Is the MM74HCT240MTCX output current difference (7.2mA vs. 6mA) significant?

A: The higher output current specification indicates greater drive capability. This is advantageous in applications with heavy capacitive loads or long trace lengths. The part remains fully compatible with circuits designed for 6mA output current.

Q: Why is 74HCT08PW listed if it is not a substitute?

A: The 74HCT08PW is included for reference only. It shares the same 74HCT logic family and package type but implements AND gate logic rather than buffer/inverter logic. It is not suitable for direct substitution without circuit redesign.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitutes maintain ROHS3 compliance, REACH unaffected status, and EAR99 ECCN classification, matching the original SN74HCT240PWT specifications.

Q: What packaging formats are available for the 74HCT240 family?

A: The 74HCT240 base product is available in multiple packaging formats including Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and Bulk. Selection depends on procurement volume and assembly requirements. All variants use the same 20-TSSOP footprint.