74VHCT244AMTC Equivalent & Substitute Parts

Part Overview

The 74VHCT244AMTC is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. Designed for 5.5V operation in a 20-TSSOP surface mount package, this component is classified as obsolete. Locating equivalent and substitute parts is necessary due to discontinued production status and limited inventory availability.

Key Parameters

Parameter	Value
Logic Type	Buffer, Non-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 74VHCT244AMTC is determined by strict equivalence across the following parameters:

Logic Type: Buffer, Non-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
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are grouped into two categories: Direct Manufacturer Substitutes (active production status, identical electrical specifications) and Upgrade Substitutes (enhanced operating temperature ranges or automotive qualifications). All listed substitutes maintain full electrical and mechanical compatibility with the original 74VHCT244AMTC.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Current Output (mA)	Operating Temp (°C)	Grade	Packaging	Inventory (Pcs)
74VHCT244AMTC	onsemi	74VHCT	Obsolete	8, 8	-40 ~ 85	Standard	20-TSSOP	4012
CAHCT244IPWRG4Q1	Texas Instruments	74AHCT	Active	8, 8	-40 ~ 85	Automotive (AEC-Q100)	20-TSSOP	2100
SN74AHCT244IPWRQ1	Texas Instruments	74AHCT	Active	8, 8	-40 ~ 85	Automotive (AEC-Q100)	20-TSSOP	1904
SN74AHCT244PWR	Texas Instruments	74AHCT	Active	8, 8	-40 ~ 125	Standard	20-TSSOP	482240
SN74AHCT244QPWRQ1	Texas Instruments	74AHCT	Active	8, 8	-40 ~ 125	Automotive (AEC-Q100)	20-TSSOP	2140
SN74LV244ATPW	Texas Instruments	74LV	Last Time Buy	16, 16	-40 ~ 85	Standard	20-TSSOP	1896
74AHCT244PW,118	Nexperia USA Inc.	74AHCT	Active	8, 8	-40 ~ 125	Standard	20-TSSOP	3900
74AHCT244PW-Q100,1	Nexperia USA Inc.	74AHCT	Active	8, 8	-40 ~ 125	Automotive (AEC-Q100)	20-TSSOP	847
74VHCT244PW,118	Nexperia USA Inc.	74VHCT	Active	8, 8	-40 ~ 125	Standard	20-TSSOP	5292
SN74AHCT244MPWREP	Texas Instruments	74AHCT	Active	8, 8	-55 ~ 125	Standard	20-TSSOP	995
SN74AHCT244QPWR	Texas Instruments	74AHCT	Active	8, 8	-40 ~ 125	Standard	20-TSSOP	2915

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 74VHCT244AMTC with identical operating temperature range (-40°C to 85°C), select from active production parts: CAHCT244IPWRG4Q1, SN74AHCT244IPWRQ1, or 74AHCT244PW,118. These maintain full electrical equivalence and are available in production quantities.

For extended temperature operation (-40°C to 125°C), upgrade to SN74AHCT244PWR, SN74AHCT244QPWRQ1, 74AHCT244PW,118, 74VHCT244PW,118, SN74AHCT244MPWREP, or SN74AHCT244QPWR. These provide enhanced thermal performance while maintaining identical electrical specifications.

For automotive applications requiring AEC-Q100 qualification, select CAHCT244IPWRG4Q1, SN74AHCT244IPWRQ1, SN74AHCT244QPWRQ1, or 74AHCT244PW-Q100,1.

The SN74LV244ATPW is not recommended as a direct substitute due to higher output current (16mA vs. 8mA), which may affect circuit behavior and power consumption.

Frequently Asked Questions (FAQ)

Q: Can I use SN74LV244ATPW as a substitute for 74VHCT244AMTC?

A: SN74LV244ATPW is not a direct substitute. While it maintains the same logic type, element count, and package, the output current specification differs (16mA vs. 8mA). This higher current capability may alter circuit performance and increase power dissipation. Use only if your design can accommodate increased output current.

Q: What is the difference between standard grade and automotive grade substitutes?

A: Automotive grade parts (AEC-Q100 qualified) undergo additional qualification testing for reliability in automotive environments. Standard grade parts are suitable for general industrial and commercial applications. Select automotive grade only if your application requires this certification.

Q: Are all substitute parts pin-compatible with the original 74VHCT244AMTC?

A: Yes. All listed substitutes use the identical 20-TSSOP package with matching pinout. Physical and electrical pin compatibility is maintained across all substitutes.

Q: Which substitute offers the best availability?

A: SN74AHCT244PWR from Texas Instruments offers the highest inventory level (482,240 pcs) and is actively produced. This part also provides extended operating temperature range (-40°C to 125°C) compared to the original specification.

Q: Can I use parts with extended temperature range in place of the original?

A: Yes. Parts rated for -40°C to 125°C are fully compatible with applications requiring only -40°C to 85°C operation. Extended temperature range provides additional design margin at no electrical cost.

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