SN74HC240PW Equivalent & Substitute Parts

Part Overview

The SN74HC240PW 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 74HC240 series provides standard inverting buffer functionality across multiple manufacturers, with several active alternatives available that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74HC240PW
Manufacturer	Texas Instruments
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)
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC240PW is determined by the following critical parameters:

Logic Type: Buffer, Inverting (must match exactly)
Number of Elements: 2 (must match exactly)
Number of Bits per Element: 4 (must match exactly)
Output Type: 3-State (must match exactly)
Current - Output High, Low: 7.8mA, 7.8mA (must match exactly)
Voltage - Supply: 2V ~ 6V (substitute must support this range)
Package / Case: 20-TSSOP (must match exactly)
Mounting Type: Surface Mount (must match exactly)

All substitute parts listed maintain these core electrical and mechanical specifications. Operating temperature ranges may vary between manufacturers while preserving functional compatibility within the specified supply voltage and output current parameters.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Voltage Supply	Temp Range (°C)	Package	Product Status
SN74HC240PW	Texas Instruments	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-TSSOP	Discontinued
SN74HC240PWR	Texas Instruments	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-TSSOP	Active
MM74HC240MTCX	Fairchild Semiconductor	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-TSSOP	Active
74HC240PW,118	Nexperia USA Inc.	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 125	20-TSSOP	Active
74HC240PW-Q100,118	Nexperia USA Inc.	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 125	20-TSSOP	Active
MC74HC240ADTR2G	onsemi	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	20-TSSOP	Active

Engineering Selection Recommendations

For applications requiring the SN74HC240PW, the following active alternatives are available:

SN74HC240PWR (Texas Instruments) provides direct manufacturer continuity with identical electrical specifications and active product status. This part is available in Cut Tape and Digi-Reel packaging formats.

74HC240PW,118 (Nexperia USA Inc.) and 74HC240PW-Q100,118 (Nexperia USA Inc.) offer extended operating temperature range (-40°C to 125°C) compared to the original part. The Q100 variant includes AEC-Q100 automotive qualification, suitable for automotive-grade applications.

MM74HC240MTCX (Fairchild Semiconductor) maintains identical specifications and active status with equivalent electrical performance.

MC74HC240ADTR2G (onsemi) provides the widest operating temperature range (-55°C to 125°C) and is recommended for applications requiring extended temperature performance while maintaining all core electrical parameters.

All substitute parts maintain ROHS3 compliance and identical 20-TSSOP packaging, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can SN74HC240PWR be used as a direct replacement for SN74HC240PW?

A: Yes. SN74HC240PWR maintains identical electrical specifications (logic type, element count, bit configuration, output type, current ratings, and supply voltage) and package format. The primary difference is product status (active vs. discontinued) and packaging format (Cut Tape/Digi-Reel vs. Tube).

Q: What is the difference between 74HC240PW,118 and 74HC240PW-Q100,118?

A: Both parts are manufactured by Nexperia USA Inc. and share identical electrical specifications. The Q100 variant includes AEC-Q100 automotive qualification and is designated for automotive applications. Both offer extended operating temperature range (-40°C to 125°C) compared to the original SN74HC240PW.

Q: Is MC74HC240ADTR2G compatible with the original SN74HC240PW?

A: Yes. MC74HC240ADTR2G maintains all critical electrical parameters (logic type, element count, bit configuration, output type, current ratings, and supply voltage) and package format. The extended operating temperature range (-55°C to 125°C) provides additional capability without affecting compatibility in standard operating conditions.

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

A: Yes. All listed substitute parts use the 20-TSSOP (0.173", 4.40mm Width) surface mount package, ensuring direct PCB compatibility without layout or assembly modifications.

Q: Which substitute part should be selected for new designs?

A: For new designs, select from active product status parts: SN74HC240PWR (Texas Instruments), 74HC240PW,118 or 74HC240PW-Q100,118 (Nexperia USA Inc.), MM74HC240MTCX (Fairchild Semiconductor), or MC74HC240ADTR2G (onsemi). All maintain the required electrical specifications and 20-TSSOP package format. Automotive applications should specify the Q100 variant.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 compliant, maintaining environmental and regulatory compatibility with the original SN74HC240PW specification.

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