74VHCT240AMTCX Equivalent & Substitute Parts

Part Overview

The 74VHCT240AMTCX is an inverting buffer logic IC manufactured by onsemi, designed for 2-element, 4-bit-per-element configurations with 3-state output capability. This device operates across a 4.5V to 5.5V supply range and is rated for -40°C to 85°C operating temperature. The part is currently active in production and ROHS3 compliant. Substitute parts are necessary when the primary part is unavailable, when alternative packaging formats are required, or when extended temperature ratings or automotive qualifications are needed for specific applications.

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)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74VHCT240AMTCX is determined by the following critical parameters: logic type (Buffer, Inverting), number of elements (2), bits per element (4), output type (3-State), output current capability (8mA, 8mA), supply voltage range (4.5V ~ 5.5V), package type, and mounting configuration. Parts are grouped into two categories:

Parametric Equivalents: Parts that match all electrical specifications and operate within the same temperature range (-40°C ~ 85°C). These include MC74VHCT240ADTRG (onsemi) and CAHCT240IPWRG4Q1 (Texas Instruments, automotive grade).

Similar Parts: Parts that maintain identical logic functionality, element count, bit configuration, output type, and current ratings but may differ in operating temperature range, package variant, or product status. These include 74AHCT240PW-Q100J (Nexperia, automotive qualified, -40°C ~ 125°C), SN74AHCT240DBR (Texas Instruments, 20-SSOP package), SN74AHCT240PW (Texas Instruments, discontinued), and SN74AHCT240PWR (Texas Instruments, active).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Operating Temp	Package	Product Status	Inventory
74VHCT240AMTCX	onsemi	74VHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	Active	5113 Pcs
MC74VHCT240ADTRG	onsemi	74VHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	Active	2240 Pcs
74AHCT240PW-Q100J	Nexperia USA Inc.	74AHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-TSSOP	Active	5688 Pcs
SN74AHCT240DBR	Texas Instruments	74AHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-SSOP	Active	1347 Pcs
SN74AHCT240PW	Texas Instruments	74AHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-TSSOP	Discontinued	966 Pcs
SN74AHCT240PWR	Texas Instruments	74AHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-TSSOP	Active	4850 Pcs
CAHCT240IPWRG4Q1	Texas Instruments	74AHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	Active	2744 Pcs

Engineering Selection Recommendations

For direct replacement with identical specifications: MC74VHCT240ADTRG is the primary parametric equivalent, maintaining the same 74VHCT series designation, operating temperature range (-40°C ~ 85°C), and 20-TSSOP package. Both parts are manufactured by onsemi and are ROHS3 compliant with MSL 1 rating.

For extended temperature applications: 74AHCT240PW-Q100J, SN74AHCT240DBR, SN74AHCT240PW, and SN74AHCT240PWR all support -40°C ~ 125°C operating temperature. These parts are suitable when thermal margin beyond the base specification is required. 74AHCT240PW-Q100J and CAHCT240IPWRG4Q1 carry AEC-Q100 automotive qualification, appropriate for automotive-grade applications.

For packaging considerations: SN74AHCT240DBR uses a 20-SSOP package (0.209", 5.30mm width) instead of 20-TSSOP, requiring PCB layout verification before substitution. All other alternatives maintain the 20-TSSOP footprint compatible with the primary part.

For product availability: SN74AHCT240PW is discontinued at DiGi Electronics and should not be selected for new designs. Active alternatives with higher inventory include 74AHCT240PW-Q100J (5688 Pcs), SN74AHCT240PWR (4850 Pcs), and MC74VHCT240ADTRG (2240 Pcs).

Frequently Asked Questions (FAQ)

Q: Can I use MC74VHCT240ADTRG as a direct replacement for 74VHCT240AMTCX?

A: Yes. MC74VHCT240ADTRG is a parametric equivalent with identical logic type, element configuration, output type, current ratings, supply voltage range, operating temperature, and 20-TSSOP package. Both are onsemi products with ROHS3 compliance and MSL 1 rating.

Q: What is the difference between 74VHCT and 74AHCT series parts?

A: Both series provide identical logic functionality, element count, bit configuration, output type, and current ratings. The primary difference is operating temperature range: 74VHCT parts operate -40°C ~ 85°C, while 74AHCT parts operate -40°C ~ 125°C. The 74AHCT series offers extended thermal capability.

Q: Can I substitute SN74AHCT240DBR for 74VHCT240AMTCX?

A: Electrical substitution is valid; however, the package differs. SN74AHCT240DBR uses 20-SSOP (0.209", 5.30mm width) versus the primary part's 20-TSSOP (0.173", 4.40mm width). PCB footprint and layout compatibility must be verified before use.

Q: Are automotive-qualified alternatives available?

A: Yes. 74AHCT240PW-Q100J (Nexperia, AEC-Q100) and CAHCT240IPWRG4Q1 (Texas Instruments, AEC-Q100) both carry automotive qualification. CAHCT240IPWRG4Q1 maintains the -40°C ~ 85°C temperature range, while 74AHCT240PW-Q100J extends to -40°C ~ 125°C.

Q: Why is SN74AHCT240PW listed if it is discontinued?

A: SN74AHCT240PW is included for reference in existing designs or legacy systems. For new designs, active alternatives such as SN74AHCT240PWR (same package and specifications) should be selected.

Q: Do all substitute parts have the same MSL and REACH compliance?

A: Yes. All listed parts maintain MSL 1 (Unlimited) moisture sensitivity level and REACH Unaffected status, ensuring consistent handling and environmental compliance across substitutions.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message