SN74AHCT240PWG4 Equivalent & Substitute Parts

Part Overview

The SN74AHCT240PWG4 is a logic buffer IC with inverting functionality, featuring 2 elements with 4 bits per element and 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 SN74AHCT240PWG4 is discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers, offering continued design support and component availability for applications requiring buffer and inverting logic 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

Substitution for the SN74AHCT240PWG4 is determined by strict equivalence across 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
Mounting Type: Surface Mount

All substitute parts listed maintain these electrical and mechanical specifications. Variations in operating temperature range, product status, and manufacturer do not affect functional substitutability within the specified parameter constraints.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Voltage (V)	Temp Range (°C)	Package	Product Status
SN74AHCT240PWG4	Texas Instruments	Buffer, Inverting	2	4	3-State	8, 8	4.5 ~ 5.5	-40 ~ 125	20-TSSOP	Discontinued
SN74AHCT240PW	Texas Instruments	Buffer, Inverting	2	4	3-State	8, 8	4.5 ~ 5.5	-40 ~ 125	20-TSSOP	Discontinued
74AHCT240PW,118	Nexperia USA Inc.	Buffer, Inverting	2	4	3-State	8, 8	4.5 ~ 5.5	-40 ~ 125	20-TSSOP	Active
74AHCT240PW-Q100J	Nexperia USA Inc.	Buffer, Inverting	2	4	3-State	8, 8	4.5 ~ 5.5	-40 ~ 125	20-TSSOP	Active
74VHCT240AMTCX	Fairchild Semiconductor	Buffer, Inverting	2	4	3-State	8, 8	4.5 ~ 5.5	-40 ~ 85	20-TSSOP	Active
MC74VHCT240ADTRG	onsemi	Buffer, Inverting	2	4	3-State	8, 8	4.5 ~ 5.5	-40 ~ 85	20-TSSOP	Active

Engineering Selection Recommendations

For applications requiring the SN74AHCT240PWG4, the following selection criteria apply:

Active Product Status: The 74AHCT240PW,118 (Nexperia) and 74AHCT240PW-Q100J (Nexperia) are currently active products with full manufacturer support and availability. These parts maintain identical electrical specifications and operating temperature range (-40°C to 125°C) as the original part.

Automotive Grade Option: The 74AHCT240PW-Q100J includes AEC-Q100 qualification, suitable for automotive applications requiring formal qualification documentation.

Extended Availability: The 74VHCT240AMTCX (Fairchild) and MC74VHCT240ADTRG (onsemi) are active alternatives with identical electrical performance. These parts operate within a reduced temperature range (-40°C to 85°C), which is acceptable for standard industrial and commercial applications.

Compliance: All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with modern manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can the 74AHCT240PW,118 directly replace the SN74AHCT240PWG4?

A: Yes. Both parts share identical logic type, element count, bit configuration, output type, current ratings, supply voltage range, and 20-TSSOP package. The primary difference is manufacturer (Nexperia vs. Texas Instruments) and product status (Active vs. Discontinued).

Q: What is the difference between 74AHCT240 and 74VHCT240 series parts?

A: Both series maintain identical electrical specifications for the parameters specified: logic type, element count, bits per element, output type, current ratings, and supply voltage. The 74VHCT series operates within a narrower temperature range (-40°C to 85°C) compared to 74AHCT (-40°C to 125°C). Selection depends on application temperature requirements.

Q: Is the 74AHCT240PW-Q100J suitable for automotive applications?

A: Yes. The 74AHCT240PW-Q100J carries AEC-Q100 qualification and maintains all electrical specifications of the original part, including the full -40°C to 125°C operating temperature range.

Q: Are there packaging differences between substitute parts?

A: All listed substitute parts use the 20-TSSOP surface mount package with identical dimensions (0.173", 4.40mm Width). Packaging format variations (Tube, Tape & Reel, Bulk) do not affect electrical or mechanical compatibility.

Q: Which substitute part offers the highest current inventory?

A: The 74AHCT240PW-Q100J (Nexperia) currently has 5,688 pieces in stock, followed by 74AHCT240PW,118 (Nexperia) with 3,622 pieces.

Q: Can I use MC74VHCT240ADTRG in applications requiring -40°C to 125°C operation?

A: No. The MC74VHCT240ADTRG operates within -40°C to 85°C. For applications requiring the full -40°C to 125°C range, use 74AHCT240PW,118 or 74AHCT240PW-Q100J.

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