SN74HCT240DWG4 Equivalent & Substitute Parts

Part Overview

The SN74HCT240DWG4 is a Buffer, Inverting logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This device operates across a 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC package. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74HCT240DWG4
Manufacturer	Texas Instruments
Base Product Number	74HCT240
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)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution for the SN74HCT240DWG4 is determined by strict equivalence across the following critical parameters:

Base product number: 74HCT240
Logic type: Buffer, Inverting
Number of elements: 2
Number of bits per element: 4
Output type: 3-State
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Voltage - Supply: 4.5V ~ 5.5V
Mounting Type: Surface Mount

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in output current (6mA vs. 7.2mA), operating temperature range (-40°C ~ 85°C vs. -40°C ~ 125°C), and manufacturer do not affect functional interchangeability within the defined parameter set.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements / Bits	Output Type	Current (High/Low)	Supply Voltage	Temp Range	Package	Product Status
SN74HCT240DWG4	Texas Instruments	Buffer, Inverting	2 / 4	3-State	6mA / 6mA	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Discontinued
SN74HCT240DWR	Texas Instruments	Buffer, Inverting	2 / 4	3-State	6mA / 6mA	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active
SN74HCT240DW	Texas Instruments	Buffer, Inverting	2 / 4	3-State	6mA / 6mA	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Discontinued
74HCT240D,653	Nexperia USA Inc.	Buffer, Inverting	2 / 4	3-State	6mA / 6mA	4.5V ~ 5.5V	-40°C ~ 125°C	20-SOIC	Active
74HCT240D-Q100,118	NXP USA Inc.	Buffer, Inverting	2 / 4	3-State	6mA / 6mA	4.5V ~ 5.5V	-40°C ~ 125°C	20-SOIC	Active
MM74HCT240WM	Fairchild Semiconductor	Buffer, Inverting	2 / 4	3-State	7.2mA / 7.2mA	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active
MM74HCT240WMX	Fairchild Semiconductor	Buffer, Inverting	2 / 4	3-State	7.2mA / 7.2mA	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC	Active

Engineering Selection Recommendations

For immediate replacement of the discontinued SN74HCT240DWG4, the SN74HCT240DWR from Texas Instruments is the direct functional equivalent, maintaining identical electrical specifications and packaging. This part is currently active and available in higher inventory quantities (3200 pcs).

For applications requiring extended operating temperature range (-40°C to 125°C), the 74HCT240D,653 (Nexperia) and 74HCT240D-Q100,118 (NXP) are suitable alternatives. The latter includes AEC-Q100 automotive qualification, appropriate for automotive-grade applications.

The Fairchild Semiconductor variants MM74HCT240WM and MM74HCT240WMX provide functional equivalence with slightly elevated output current specifications (7.2mA vs. 6mA). These parts are suitable for applications where increased drive capability is beneficial or neutral.

All listed substitutes maintain ROHS3 compliance and are electrically interchangeable within the defined parameter constraints.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HCT240DWR as a direct replacement for SN74HCT240DWG4?

A: Yes. Both parts share identical electrical specifications, package type (20-SOIC), and functional characteristics. The primary difference is packaging format (Cut Tape & Digi-Reel vs. standard packaging) and product status (Active vs. Discontinued).

Q: What is the difference between the Texas Instruments and Nexperia versions?

A: The Nexperia 74HCT240D,653 maintains the same core logic function and package but extends the operating temperature range to -40°C ~ 125°C compared to the Texas Instruments -40°C ~ 85°C range. Both are electrically interchangeable for standard applications.

Q: Are the Fairchild Semiconductor parts (MM74HCT240WM and MM74HCT240WMX) compatible?

A: Yes. These parts are functionally equivalent with the same logic type, element count, and package. The output current specification is 7.2mA (vs. 6mA for other variants), which represents increased drive capability and does not prevent interchangeability.

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

A: No. Automotive qualification (AEC-Q100) indicates enhanced reliability testing and is suitable for any application. This part is interchangeable in non-automotive designs.

Q: What packaging formats are available for 74HCT240 substitutes?

A: Available packaging includes Cut Tape & Digi-Reel (SN74HCT240DWR), Tape & Reel (74HCT240D,653), and Bulk (74HCT240D-Q100,118, MM74HCT240WM, MM74HCT240WMX). All maintain the 20-SOIC physical package specification.

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