SN74HCT240DWRE4 Equivalent & Substitute Parts

Part Overview

The SN74HCT240DWRE4 is a logic buffer IC manufactured by Texas Instruments, classified as an inverting buffer with 2 elements and 4 bits per element, featuring 3-state output capability. This device is designed for bus driving applications in digital logic circuits operating at 5V supply levels.

The SN74HCT240DWRE4 is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers, all maintaining the same functional specifications and pin compatibility within the 74HCT240 logic family.

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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74HCT240DWRE4 is determined by the following critical parameters:

Logic function: Buffer, Inverting with 2 elements and 4 bits per element
Output configuration: 3-State output
Supply voltage range: 4.5V ~ 5.5V
Output current capability: 6mA minimum (high and low)
Package type: 20-SOIC form factor
Operating temperature range: -40°C ~ 85°C minimum
Base product number: 74HCT240

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional and pin-level compatibility. Variations in output current (7.2mA vs 6mA) and operating temperature ranges represent enhanced or equivalent performance characteristics.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Product Status	Current - Output High, Low	Operating Temperature	Package / Case	Inventory
SN74HCT240DWRE4	Texas Instruments	Discontinued	6mA, 6mA	-40°C ~ 85°C	20-SOIC	930 Pcs
SN74HCT240DWR	Texas Instruments	Active	6mA, 6mA	-40°C ~ 85°C	20-SOIC	3200 Pcs
74HCT240D,653	Nexperia USA Inc.	Active	6mA, 6mA	-40°C ~ 125°C	20-SOIC	3792 Pcs
MM74HCT240WM	Fairchild Semiconductor	Active	7.2mA, 7.2mA	-40°C ~ 85°C	20-SOIC	4353 Pcs
MM74HCT240WMX	Fairchild Semiconductor	Active	7.2mA, 7.2mA	-40°C ~ 85°C	20-SOIC	8200 Pcs
74HCT240D	Toshiba Semiconductor and Storage	Active	6mA, 6mA	-40°C ~ 85°C	20-SOIC	8300 Pcs

Engineering Selection Recommendations

Primary Recommendation: SN74HCT240DWR

The SN74HCT240DWR from Texas Instruments is the manufacturer-recommended direct substitute. It maintains identical electrical specifications to the discontinued SN74HCT240DWRE4, including output current (6mA), operating temperature range (-40°C ~ 85°C), and 20-SOIC packaging. This part is in active production status with substantial inventory availability (3200 Pcs).

Alternative Selections:

The 74HCT240D,653 from Nexperia USA Inc. provides an extended operating temperature range (-40°C ~ 125°C) while maintaining all other electrical parameters. This option is suitable for applications requiring enhanced thermal performance.

The MM74HCT240WM and MM74HCT240WMX from Fairchild Semiconductor offer increased output current capability (7.2mA vs 6mA), providing enhanced drive capability for bus applications. Both variants are in active production with high inventory levels.

The 74HCT240D from Toshiba Semiconductor and Storage is a parametric equivalent with identical specifications to the original part and represents an alternative source for supply chain diversification.

All substitute parts are ROHS3 compliant and maintain the same moisture sensitivity level (MSL 1) and package form factor.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HCT240DWR as a direct replacement for SN74HCT240DWRE4?

A: Yes. The SN74HCT240DWR is the manufacturer-recommended substitute with identical electrical specifications, output current ratings, operating temperature range, and 20-SOIC package configuration.

Q: What is the difference between the Fairchild MM74HCT240WM and MM74HCT240WMX variants?

A: Both parts are functionally equivalent with identical output current (7.2mA) and operating temperature specifications. The primary difference is inventory availability and packaging designation (Bulk). Selection between these variants depends on procurement requirements and supplier availability.

Q: Is the Nexperia 74HCT240D,653 compatible with the original SN74HCT240DWRE4?

A: Yes. The 74HCT240D,653 maintains all critical electrical parameters including logic function, output type, supply voltage, and output current. The extended operating temperature range (-40°C ~ 125°C) represents enhanced performance and does not affect compatibility.

Q: Why do some substitutes have higher output current ratings (7.2mA vs 6mA)?

A: The Fairchild variants (MM74HCT240WM and MM74HCT240WMX) provide enhanced output drive capability. This represents improved performance and maintains full backward compatibility with designs specified for 6mA output current.

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

A: Yes. All listed substitute parts use the 20-SOIC (0.295", 7.50mm Width) package form factor, ensuring mechanical and electrical pin compatibility.

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

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life with no moisture sensitivity precautions required during storage or handling. All listed parts maintain this specification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message