SN74HCT240PW Equivalent & Substitute Parts

Part Overview

The SN74HCT240PW 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 series maintains consistent functional and electrical characteristics across multiple manufacturers and packaging options, enabling direct substitution based on electrical parameter compatibility.

Substiute Parts

SN74HCT240PW

Texas InstrumentsIn Stock: 2970SN74HCT240PW Datasheet

Current PartRFQ

SN74HCT240PWR

Texas InstrumentsIn Stock: 65948SN74HCT240PWR Datasheet

DirectRFQ

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 of the SN74HCT240PW is determined by strict electrical and mechanical parameter matching within the 74HCT240 product family. All substitute parts maintain identical logic function (Buffer, Inverting), element configuration (2 elements, 4 bits per element), output type (3-State), supply voltage range (4.5V ~ 5.5V), and package form factor (20-TSSOP). Substitutes are grouped into two categories based on output current specifications and operating temperature range:

Category 1 - Standard Output Current (6mA): Parts with 6mA output current matching the original specification, suitable for applications with standard drive requirements.

Category 2 - Enhanced Output Current (7.2mA): Parts with 7.2mA output current, providing increased drive capability while maintaining full electrical compatibility within the 74HCT240 series specifications.

All substitute parts share the same 20-TSSOP package and surface mount mounting type, ensuring mechanical and thermal compatibility with existing PCB designs.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute - SN74HCT240PWR (Texas Instruments): This part maintains identical electrical specifications to the original SN74HCT240PW while offering active product status and significantly higher inventory availability (65,880 pcs). The Cut Tape and Digi-Reel packaging options provide flexibility for both production and maintenance applications. Recommended for direct replacement in all applications currently using SN74HCT240PW.

Extended Temperature Alternative - 74HCT240PW,118 (NXP USA Inc.) or 74HCT240PW-Q100,11 (Nexperia USA Inc.): Both parts provide extended operating temperature range (-40°C ~ 125°C) compared to the original specification (-40°C ~ 85°C), offering enhanced thermal margin for demanding environments. The Nexperia part includes AEC-Q100 automotive qualification and ROHS3 compliance certification. Select these options when extended temperature performance or automotive-grade qualification is required.

Enhanced Drive Current Option - MM74HCT240MTCX (Fairchild Semiconductor): This part provides 7.2mA output current versus the standard 6mA specification, delivering increased drive capability for applications requiring higher output current. Electrical compatibility is maintained within 74HCT240 series parameters. Consider this option only when increased output current is specifically required by the application.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT240PWR be used as a direct replacement for SN74HCT240PW?

A: Yes. Both parts share identical electrical specifications including logic function, element configuration, output type, supply voltage range, output current (6mA), and operating temperature range (-40°C ~ 85°C). The 20-TSSOP package and surface mount mounting type are identical. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tube) and product status (Active versus Discontinued).

Q: What is the difference between the standard 6mA and enhanced 7.2mA output current options?

A: The MM74HCT240MTCX provides 7.2mA output current compared to 6mA in other substitutes. This increased drive capability allows the part to source or sink higher current loads while maintaining 3-state output functionality. Select the 7.2mA option only if your application requires this enhanced current specification. Standard 6mA parts are suitable for typical logic-level buffering applications.

Q: Are the extended temperature parts (NXP and Nexperia) compatible with designs specified for -40°C ~ 85°C operation?

A: Yes. Extended temperature range parts (-40°C ~ 125°C) are fully compatible with applications specified for -40°C ~ 85°C operation. The extended range provides additional thermal margin and is a direct electrical substitute. No design changes are required.

Q: Does the Nexperia 74HCT240PW-Q100,11 automotive qualification affect its use in non-automotive applications?

A: No. AEC-Q100 qualification indicates the part meets automotive industry reliability and testing standards. This certification does not restrict use in non-automotive applications. The part is electrically and mechanically identical to non-qualified versions and can be used in any 74HCT240 application.

Q: What packaging options are available for production versus maintenance applications?

A: SN74HCT240PWR offers Cut Tape and Digi-Reel packaging suitable for both high-volume production and component-level maintenance. The 74HCT240PW-Q100,11 provides Tape & Reel packaging for production environments. The 74HCT240PW,118 is available in Bulk packaging. Select packaging based on your procurement and assembly requirements.