SN74HC240DW Equivalent & Substitute Parts

Part Overview

The SN74HC240DW 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 2V to 6V supply voltage range and is rated for -40°C to 85°C operating temperature. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts maintain identical functional specifications while offering different packaging options, product status, or extended temperature ratings.

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	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)
Base Product Number	74HC240
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74HC240DW is determined by strict adherence to the following electrical and mechanical parameters:

Core Substitution Criteria:

Logic Type: Buffer, Inverting (mandatory match)
Number of Elements: 2 (mandatory match)
Number of Bits per Element: 4 (mandatory match)
Output Type: 3-State (mandatory match)
Current - Output High, Low: 7.8mA, 7.8mA (mandatory match)
Voltage - Supply: 2V ~ 6V (mandatory match)
Mounting Type: Surface Mount (mandatory match)
Base Product Number: 74HC240 (mandatory match)

Allowable Variations:

Operating Temperature: Extended ranges (-55°C ~ 125°C) are acceptable as they encompass the original -40°C ~ 85°C specification
Package / Case: 20-SOIC and 20-SO variants are mechanically compatible within the 0.295" (7.50mm) width specification
Packaging Format: Tube, Cut Tape (CT) & Digi-Reel®, Bulk, and Tape & Reel (TR) are interchangeable for component procurement
Manufacturer: Multiple qualified manufacturers produce functionally identical parts
RoHS and MSL Status: Variations in compliance certifications do not affect electrical substitution

Parameter Comparison

Manufacturer Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Voltage Supply	Temp Range (°C)	Package	Product Status
SN74HC240DW	Texas Instruments	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SOIC	Discontinued
SN74HC240DWR	Texas Instruments	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SOIC	Active
MM74HC240WMX	Fairchild Semiconductor	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SOIC	Active
74HC240D,653	Nexperia USA Inc.	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 125	20-SO	Active
74HC240D-Q100,118	NXP USA Inc.	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 125	20-SO	Active
MC74HC240ADWG	onsemi	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	20-SOIC	Active
MC74HC240ADWR2G	onsemi	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	20-SOIC	Active
MM74HC240WM	Fairchild Semiconductor	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SOIC	Active

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): SN74HC240DWR is the direct equivalent from Texas Instruments, maintaining identical electrical and thermal specifications with active product status and Cut Tape & Digi-Reel® packaging availability.

Equivalent with Extended Temperature Range: 74HC240D,653 (Nexperia) and 74HC240D-Q100,118 (NXP) provide extended operating temperature to -40°C ~ 125°C, offering improved thermal margin for demanding applications. The 74HC240D-Q100,118 includes AEC-Q100 automotive qualification.

Extended Temperature with Broader Manufacturer Support: MC74HC240ADWG and MC74HC240ADWR2G from onsemi extend the operating range to -55°C ~ 125°C, providing the widest thermal envelope. MC74HC240ADWR2G offers Tape & Reel packaging for high-volume production.

Fairchild Semiconductor Alternatives: MM74HC240WMX and MM74HC240WM maintain the original -40°C ~ 85°C specification with active product status and bulk packaging options.

All listed substitutes maintain ROHS3 compliance and are electrically interchangeable within the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC240DWR as a direct replacement for SN74HC240DW? A: Yes. SN74HC240DWR is functionally identical to SN74HC240DW, with matching electrical specifications, operating temperature range, and 20-SOIC package. The primary difference is packaging format (Cut Tape & Digi-Reel® versus Tube) and active product status.

Q: What is the difference between 20-SOIC and 20-SO packages? A: Both packages are mechanically compatible within the 0.295" (7.50mm) width specification and maintain identical pin configurations. SOIC denotes Small Outline Integrated Circuit, while SO denotes Small Outline. These designations are functionally equivalent for substitution purposes.

Q: Are the onsemi parts (MC74HC240ADWG and MC74HC240ADWR2G) suitable replacements? A: Yes. Both onsemi parts are electrically equivalent with identical logic specifications and output characteristics. They offer extended operating temperature (-55°C ~ 125°C) compared to the original -40°C ~ 85°C range, making them suitable for wider thermal applications. Moisture Sensitivity Level differs (MSL 3 versus MSL 1), which may affect storage and handling requirements.

Q: Why do some substitutes have extended temperature ratings? A: Extended temperature ratings (-40°C ~ 125°C or -55°C ~ 125°C) represent enhanced thermal specifications from different manufacturers. These are acceptable substitutes as they encompass the original -40°C ~ 85°C requirement and provide additional operational margin.

Q: Does the automotive qualification (AEC-Q100) on 74HC240D-Q100,118 affect general-purpose applications? A: No. AEC-Q100 qualification indicates the part meets automotive industry standards and is suitable for automotive and general industrial applications. It does not restrict use in non-automotive applications.

Q: Are there any compliance differences between substitutes? A: All listed substitutes maintain ROHS3 compliance and REACH Unaffected status. Moisture Sensitivity Level (MSL) varies between MSL 1 (Unlimited) and MSL 3 (168 Hours), affecting storage and handling protocols but not electrical performance.

Q: Which substitute offers the best availability? A: 74HC240D,653 (Nexperia) shows the highest inventory at 9,720 pieces, followed by MC74HC240ADWR2G (onsemi) at 8,890 pieces. Both are active products with extended temperature ratings.

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