SN74AHCT240PWE4 Equivalent & Substitute Parts

Part Overview

The SN74AHCT240PWE4 is a Buffer, Inverting logic IC with 2 elements and 4 bits per element, featuring 3-State output capability. Manufactured by Texas Instruments in a 20-TSSOP surface mount package, this component operates across a 4.5V to 5.5V supply voltage range with an operating temperature range of -40°C to 125°C.

The SN74AHCT240PWE4 is discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers, offering continued design support and component availability for applications requiring this logic buffer functionality.

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	8mA, 8mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74AHCT240PWE4 are grouped based on strict electrical and mechanical compatibility. All substitute parts maintain the following critical parameters:

Logic Type: Buffer, Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Current - Output High, Low: 8mA, 8mA
Voltage - Supply: 4.5V ~ 5.5V
Package / Case: 20-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount

Substitutes are categorized by manufacturer and product status. The SN74AHCT240PW (Texas Instruments) serves as the manufacturer-recommended direct equivalent. The 74AHCT240PW,118 (Nexperia) and 74AHCT240PW-Q100J (Nexperia, automotive-qualified) represent active product alternatives. The 74VHCT240AMTCX (Fairchild Semiconductor) and MC74VHCT240ADTRG (onsemi) are functionally equivalent parts from alternative manufacturers, with operating temperature ranges of -40°C to 85°C.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Voltage (V)	Temp Range (°C)	Package	RoHS
SN74AHCT240PWE4	Texas Instruments	74AHCT	Discontinued	Buffer, Inverting	2	4	3-State	8, 8	4.5 ~ 5.5	-40 ~ 125	20-TSSOP	ROHS3
SN74AHCT240PW	Texas Instruments	74AHCT	Discontinued	Buffer, Inverting	2	4	3-State	8, 8	4.5 ~ 5.5	-40 ~ 125	20-TSSOP	ROHS3
74AHCT240PW,118	Nexperia USA Inc.	74AHCT	Active	Buffer, Inverting	2	4	3-State	8, 8	4.5 ~ 5.5	-40 ~ 125	20-TSSOP	ROHS3
74AHCT240PW-Q100J	Nexperia USA Inc.	74AHCT	Active	Buffer, Inverting	2	4	3-State	8, 8	4.5 ~ 5.5	-40 ~ 125	20-TSSOP	ROHS3
74VHCT240AMTCX	Fairchild Semiconductor	74VHCT	Active	Buffer, Inverting	2	4	3-State	8, 8	4.5 ~ 5.5	-40 ~ 85	20-TSSOP	Not specified
MC74VHCT240ADTRG	onsemi	74VHCT	Active	Buffer, Inverting	2	4	3-State	8, 8	4.5 ~ 5.5	-40 ~ 85	20-TSSOP	ROHS3

Engineering Selection Recommendations

For applications requiring the full operating temperature range of -40°C to 125°C, select from the 74AHCT series substitutes: 74AHCT240PW,118 (Nexperia, active product status) or 74AHCT240PW-Q100J (Nexperia, active with AEC-Q100 automotive qualification).

For applications with operating temperature requirements limited to -40°C to 85°C, the 74VHCT series alternatives—74VHCT240AMTCX (Fairchild Semiconductor) and MC74VHCT240ADTRG (onsemi)—are functionally equivalent and available in active product status.

All substitute parts maintain identical electrical specifications (8mA output current, 4.5V to 5.5V supply voltage) and package configuration (20-TSSOP surface mount). Selection should be based on temperature range requirements, product availability, and compliance certifications applicable to the end application.

Frequently Asked Questions (FAQ)

Q: Can the 74VHCT240AMTCX or MC74VHCT240ADTRG be used as direct replacements for the SN74AHCT240PWE4?

A: Yes, for applications operating within -40°C to 85°C. Both parts maintain identical logic functionality, output current specifications, supply voltage range, and 20-TSSOP package configuration. If your application requires operation above 85°C, use the 74AHCT series substitutes instead.

Q: What is the difference between the 74AHCT240PW,118 and 74AHCT240PW-Q100J?

A: Both are Nexperia products with identical electrical and thermal specifications (-40°C to 125°C operating range). The 74AHCT240PW-Q100J carries AEC-Q100 automotive qualification, making it suitable for automotive applications. The 74AHCT240PW,118 is the standard industrial-grade equivalent.

Q: Are all substitute parts ROHS3 compliant?

A: The 74AHCT240PW,118, 74AHCT240PW-Q100J, and MC74VHCT240ADTRG are ROHS3 compliant. The 74VHCT240AMTCX RoHS status is not specified in available documentation.

Q: Does packaging type affect substitution compatibility?

A: All substitute parts use the same 20-TSSOP surface mount package. Packaging variations (Tube, Tape & Reel, Bulk) do not affect electrical or mechanical compatibility—only handling and storage procedures.

Q: Which substitute offers the highest inventory availability?

A: The 74AHCT240PW,118 (Nexperia) offers 3,622 pieces in stock, followed by 74AHCT240PW-Q100J (Nexperia) with 5,688 pieces. Both represent active products with reliable supply.

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