MM74HCT244MTC Equivalent & Substitute Parts

Part Overview

The MM74HCT244MTC is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This 20-TSSOP surface mount device operates across a 4.5V to 5.5V supply voltage range and is designed for signal buffering applications requiring TTL-compatible logic levels. The part is currently active in production status and RoHS3 compliant. Equivalent and substitute parts are identified based on matching functional characteristics, electrical parameters, and mechanical compatibility to support component sourcing flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Voltage Supply Range	4.5V ~ 5.5V
Current Output High/Low	7.2mA / 7.2mA
Operating Temperature	-40°C ~ 85°C
Package Type	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MM74HCT244MTC are grouped based on the following critical parameters that determine functional and mechanical compatibility:

Primary Substitution Criteria:

Logic type: Buffer, Non-Inverting
Number of elements: 2
Number of bits per element: 4
Output type: 3-State
Package type: 20-TSSOP or 20-SSOP (mechanically compatible)
Voltage supply range: Must include or overlap 4.5V ~ 5.5V
RoHS3 compliance
Moisture sensitivity level: 1 (Unlimited)

Substitution Groups:

Group 1: Direct Equivalents (20-TSSOP, 74HCT Series, -40°C ~ 85°C) Parts with identical package, series designation, and operating temperature range as the main part.

Group 2: Extended Temperature Range (20-TSSOP, 74HCT Series, -40°C ~ 125°C) Parts with identical package and series but extended upper operating temperature limit, suitable for applications requiring broader temperature operation.

Group 3: Automotive Grade (20-TSSOP, 74HCT Series, AEC-Q100) Parts meeting automotive qualification standards with extended temperature range and automotive-specific certifications.

Group 4: Alternative Package (20-SSOP, 74HCT Series) Parts with functionally equivalent specifications but in 20-SSOP package format (0.209", 5.30mm Width) instead of 20-TSSOP.

Group 5: Broader Supply Voltage (20-TSSOP, 74HC Series, 2V ~ 6V) Parts with extended supply voltage range supporting both 74HC and 74HCT logic families, offering wider operational flexibility.

Parameter Comparison

Part Number	Manufacturer	Series	Package	Voltage Supply	Temp Range	Output Current (H/L)	Status	Inventory
MM74HCT244MTC	onsemi	74HCT	20-TSSOP	4.5V ~ 5.5V	-40°C ~ 85°C	7.2mA / 7.2mA	Active	926 Pcs
MC74HCT244ADTR2G	onsemi	74HCT	20-TSSOP	4.5V ~ 5.5V	-55°C ~ 125°C	6mA / 6mA	Active	4507 Pcs
74HCT244PW,118	Nexperia USA Inc.	74HCT	20-TSSOP	4.5V ~ 5.5V	-40°C ~ 125°C	6mA / 6mA	Active	2100 Pcs
SN74HCT244DBR	Texas Instruments	74HCT	20-SSOP	4.5V ~ 5.5V	-40°C ~ 85°C	6mA / 6mA	Active	1111 Pcs
SN74HCT244PW	Texas Instruments	74HCT	20-TSSOP	4.5V ~ 5.5V	-40°C ~ 85°C	6mA / 6mA	Discontinued at DiGi Electronics	2140 Pcs
SN74HCT244PWR	Texas Instruments	74HCT	20-TSSOP	4.5V ~ 5.5V	-40°C ~ 85°C	6mA / 6mA	Active	16397 Pcs
SN74HCT244PWT	Texas Instruments	74HCT	20-TSSOP	4.5V ~ 5.5V	-40°C ~ 85°C	6mA / 6mA	Discontinued at DiGi Electronics	4552 Pcs
SN74HCT244QPWREP	Texas Instruments	74HCT	20-TSSOP	4.5V ~ 5.5V	-40°C ~ 125°C	6mA / 6mA	Active	2781 Pcs
SN74HCT244QPWRG4Q1	Texas Instruments	74HCT	20-TSSOP	4.5V ~ 5.5V	-40°C ~ 125°C	6mA / 6mA	Active	2923 Pcs
SN74HCT244QPWRQ1	Texas Instruments	74HCT	20-TSSOP	4.5V ~ 5.5V	-40°C ~ 125°C	6mA / 6mA	Active	3770 Pcs
MC74HC244ADTR2G	onsemi	74HC	20-TSSOP	2V ~ 6V	-55°C ~ 125°C	7.8mA / 7.8mA	Active	16612 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Operating Conditions): SN74HCT244PWR (Texas Instruments) is the primary recommendation. This part maintains identical electrical specifications to the MM74HCT244MTC, operates within the same temperature range (-40°C ~ 85°C), and is currently in active production status with high inventory availability (16,397 pcs). Both parts are RoHS3 compliant with MSL 1 rating.

For Extended Temperature Applications (-40°C ~ 125°C): SN74HCT244QPWREP, SN74HCT244QPWRG4Q1, or MC74HCT244ADTR2G provide extended upper temperature limits while maintaining 4.5V ~ 5.5V supply voltage compatibility. SN74HCT244QPWRG4Q1 includes AEC-Q100 automotive qualification for applications requiring automotive-grade components.

For Alternative Packaging (20-SSOP): SN74HCT244DBR offers equivalent electrical performance in 20-SSOP package format. This substitution is valid only if PCB layout accommodates the wider 5.30mm package width compared to the standard 4.40mm TSSOP width.

For Broader Supply Voltage Range: MC74HC244ADTR2G supports 2V ~ 6V supply voltage operation, extending compatibility beyond the standard 4.5V ~ 5.5V range. This part operates across both 74HC and 74HCT logic families and is suitable for applications requiring wider voltage flexibility.

Avoid: SN74HCT244PW and SN74HCT244PWT are discontinued at DiGi Electronics and should not be selected for new designs despite available inventory.

Frequently Asked Questions (FAQ)

Q: Can MC74HC244ADTR2G replace MM74HCT244MTC in a 5V system? A: Yes. MC74HC244ADTR2G operates across 2V ~ 6V supply range, which includes the 4.5V ~ 5.5V operating window of the MM74HCT244MTC. However, the 74HC series has different input/output voltage thresholds compared to 74HCT. Verify logic level compatibility with upstream and downstream components before substitution.

Q: What is the difference between 20-TSSOP and 20-SSOP packages? A: Both are 20-pin surface mount packages with identical pin counts and pitch. The primary difference is package width: 20-TSSOP is 4.40mm wide, while 20-SSOP is 5.30mm wide. PCB footprints are not interchangeable; verify layout compatibility before selecting SN74HCT244DBR as a substitute.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts carry RoHS3 compliance certification, matching the environmental compliance status of the MM74HCT244MTC.

Q: Which substitute has the highest output current capability? A: MC74HC244ADTR2G provides 7.8mA output current (high and low), compared to 6mA ~ 7.2mA for other substitutes. This part is suitable for applications requiring maximum drive capability.

Q: Can I use SN74HCT244QPWRG4Q1 in commercial applications? A: SN74HCT244QPWRG4Q1 is qualified to AEC-Q100 automotive standards. While automotive-qualified parts function in commercial applications, they are typically specified for automotive use. Commercial applications may use standard-grade equivalents such as SN74HCT244PWR or MC74HCT244ADTR2G.

Q: What is the moisture sensitivity difference between parts? A: MM74HCT244MTC and most substitutes carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. SN74HCT244QPWRQ1 carries MSL 3 (168 Hours), requiring controlled storage and handling conditions. For applications with extended shelf storage, MSL 1 parts are preferred.

Q: Are there inventory considerations for long-term sourcing? A: MC74HC244ADTR2G has the highest inventory (16,612 pcs), followed by SN74HCT244PWR (16,397 pcs). Parts listed as discontinued at DiGi Electronics (SN74HCT244PW, SN74HCT244PWT) should not be relied upon for ongoing production requirements.

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