SN74HCT240DW Equivalent & Substitute Parts

Part Overview

The SN74HCT240DW is a Buffer, Inverting logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This 20-SOIC surface mount device operates across a 4.5V to 5.5V supply voltage range and is designed for applications requiring signal buffering and inversion in digital logic circuits. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Logic Type	Buffer, Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	6mA, 6mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the SN74HCT240DW is determined by strict equivalence across the following critical parameters:

Logic Type: Buffer, Inverting (2 elements, 4 bits per element)
Output Type: 3-State
Supply Voltage Range: 4.5V ~ 5.5V
Package: 20-SOIC surface mount
Output Current Capability: 6mA minimum (High and Low)
Operating Temperature Range: -40°C minimum to 85°C minimum

Substitute parts must maintain identical functional specifications and package compatibility. Variations in output current (7.2mA vs 6mA) and operating temperature ranges (up to 125°C) represent enhanced capabilities and are acceptable for direct substitution. Packaging format variations (Tape & Reel, Bulk, Cut Tape) do not affect electrical compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Logic Type	Output Current (mA)	Supply Voltage	Operating Temp (°C)	Package	Product Status	Inventory (Pcs)
SN74HCT240DW	Texas Instruments	Buffer, Inverting	6, 6	4.5V ~ 5.5V	-40 ~ 85	20-SOIC	Discontinued	2100
SN74HCT240DWR	Texas Instruments	Buffer, Inverting	6, 6	4.5V ~ 5.5V	-40 ~ 85	20-SOIC	Active	3200
MM74HCT240WM	Fairchild Semiconductor	Buffer, Inverting	7.2, 7.2	4.5V ~ 5.5V	-40 ~ 85	20-SOIC	Active	4353
74HCT240D,653	Nexperia USA Inc.	Buffer, Inverting	6, 6	4.5V ~ 5.5V	-40 ~ 125	20-SOIC	Active	3792
74HCT240D-Q100,118	NXP USA Inc.	Buffer, Inverting	6, 6	4.5V ~ 5.5V	-40 ~ 125	20-SOIC	Active	6082
MM74HCT240WMX	Fairchild Semiconductor	Buffer, Inverting	7.2, 7.2	4.5V ~ 5.5V	-40 ~ 85	20-SOIC	Active	8200

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and functional equivalence to the SN74HCT240DW within the specified parameters. Selection should be based on the following criteria:

Primary Recommendation: SN74HCT240DWR (Texas Instruments) provides direct equivalence with identical specifications and active product status from the original manufacturer.

Alternative Options:

74HCT240D,653 (Nexperia USA Inc.) and 74HCT240D-Q100,118 (NXP USA Inc.) offer extended operating temperature range (-40°C to 125°C) and are actively manufactured, providing long-term availability assurance.
MM74HCT240WM and MM74HCT240WMX (Fairchild Semiconductor) provide enhanced output current capability (7.2mA vs 6mA), suitable for applications requiring higher drive capability while maintaining full backward compatibility.

All substitute parts are ROHS3 compliant and REACH unaffected. The 74HCT240D-Q100,118 carries AEC-Q100 automotive qualification, appropriate for automotive-grade applications.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT240DWR be used as a direct replacement for SN74HCT240DW?

A: Yes. SN74HCT240DWR is electrically and functionally identical to SN74HCT240DW, with matching output current (6mA), supply voltage range (4.5V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). The primary difference is packaging format (Cut Tape & Digi-Reel vs standard packaging) and active product status.

Q: What is the difference between the Fairchild parts (MM74HCT240WM, MM74HCT240WMX) and Texas Instruments parts?

A: Fairchild parts provide higher output current capability (7.2mA vs 6mA). This represents enhanced performance and does not affect compatibility. Both maintain identical logic function, supply voltage, and package specifications.

Q: Are the Nexperia and NXP parts suitable for extended temperature applications?

A: Yes. Both 74HCT240D,653 (Nexperia) and 74HCT240D-Q100,118 (NXP) operate across -40°C to 125°C, extending the upper temperature limit by 40°C compared to the original SN74HCT240DW. This enhanced capability is fully backward compatible.

Q: Does the 74HCT240D-Q100,118 automotive qualification affect non-automotive applications?

A: No. AEC-Q100 qualification indicates additional testing and reliability assurance. This part functions identically in non-automotive applications and may be selected for enhanced reliability requirements.

Q: Are all substitute parts available in 20-SOIC package?

A: Yes. All listed substitutes use the 20-SOIC (0.295", 7.50mm Width) surface mount package, ensuring PCB footprint compatibility with the original SN74HCT240DW design.

Q: What packaging formats are available for these substitutes?

A: Packaging formats vary by part number and supplier: SN74HCT240DWR is available in Cut Tape and Digi-Reel; MM74HCT240WM and MM74HCT240WMX are supplied in Bulk; 74HCT240D,653 is available in Tape & Reel; 74HCT240D-Q100,118 is supplied in Bulk. All formats contain identical die and electrical specifications.

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