SN74AHCT240IPWRQ1 Equivalent & Substitute Parts

Part Overview

The SN74AHCT240IPWRQ1 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 package. This part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device operates across a 4.5V to 5.5V supply range and meets automotive-grade AEC-Q100 qualification standards.

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 ~ 85°C (TA)
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Grade	Automotive
Qualification	AEC-Q100
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN74AHCT240IPWRQ1 is determined by strict equivalence across the following critical parameters:

Logic Type: Buffer, Inverting (2 elements, 4 bits per element)
Output Type: 3-State
Output Current: 8mA high and low
Supply Voltage Range: 4.5V ~ 5.5V
Package: 20-TSSOP form factor
Mounting Type: Surface Mount

Substitute parts must maintain identical functional specifications and package dimensions to ensure direct replacement capability. The primary distinction among substitutes relates to product status (Active vs. Obsolete), manufacturer identity, and operating temperature range extensions.

Parameter Comparison

Parameter	SN74AHCT240IPWRQ1 (Main)	CAHCT240IPWRG4Q1	74AHCT240PW-Q100J	74VHCT240AMTCX	MC74VHCT240ADTRG
Manufacturer	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Fairchild Semiconductor	onsemi
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting
Number of Elements	2	2	2	2	2
Number of Bits per Element	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Grade	Automotive	Automotive	Automotive	-	-
Qualification	AEC-Q100	AEC-Q100	AEC-Q100	-	-
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Automotive-Grade, AEC-Q100 Qualified):

CAHCT240IPWRG4Q1 (Texas Instruments) and 74AHCT240PW-Q100J (Nexperia USA Inc.) are the preferred substitutes. Both maintain full automotive qualification and AEC-Q100 compliance. CAHCT240IPWRG4Q1 is a direct parametric equivalent with identical operating temperature range (-40°C ~ 85°C). The 74AHCT240PW-Q100J extends the upper operating temperature to 125°C, providing enhanced thermal margin for high-temperature applications while maintaining all other electrical specifications.

Secondary Substitutes (Non-Automotive Grade):

74VHCT240AMTCX (Fairchild Semiconductor) and MC74VHCT240ADTRG (onsemi) provide functional equivalence with identical electrical parameters and 20-TSSOP packaging. These parts operate within the same voltage and current specifications but lack automotive-grade designation and AEC-Q100 qualification. Selection of these parts is appropriate only for non-automotive applications or where automotive certification is not a design requirement.

Frequently Asked Questions (FAQ)

Q: Can the SN74AHCT240IPWRQ1 be directly replaced with CAHCT240IPWRG4Q1?

A: Yes. Both parts are Texas Instruments 74AHCT series devices with identical logic type, element count, bit configuration, output type, current ratings, supply voltage range, operating temperature, and 20-TSSOP package. The primary difference is product status: CAHCT240IPWRG4Q1 is Active while SN74AHCT240IPWRQ1 is Obsolete.

Q: What is the difference between the automotive-qualified substitutes and the non-automotive options?

A: CAHCT240IPWRG4Q1 and 74AHCT240PW-Q100J carry automotive-grade designation and AEC-Q100 qualification, meeting stringent automotive reliability and quality standards. 74VHCT240AMTCX and MC74VHCT240ADTRG lack these certifications. For automotive applications, use only AEC-Q100 qualified parts.

Q: Does the 74AHCT240PW-Q100J operating temperature range of -40°C ~ 125°C affect compatibility?

A: No. The extended upper temperature limit of 125°C (versus 85°C on the main part) represents an enhancement, not a limitation. This part remains fully compatible and suitable for applications requiring higher thermal tolerance.

Q: Are all substitutes available in the same packaging format?

A: Yes. All substitute parts use the 20-TSSOP (0.173", 4.40mm Width) surface mount package, ensuring identical PCB footprint and mounting compatibility.

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

A: For new automotive designs, select either CAHCT240IPWRG4Q1 or 74AHCT240PW-Q100J. Both maintain AEC-Q100 qualification and automotive-grade status. Choose based on thermal requirements: CAHCT240IPWRG4Q1 for standard -40°C ~ 85°C range, or 74AHCT240PW-Q100J for applications requiring extended temperature operation to 125°C.

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