MM74HCT373MTC Equivalent & Substitute Parts

Part Overview

The MM74HCT373MTC is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output capability in a 20-TSSOP surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74HCT373 series maintains functional compatibility across multiple manufacturers, enabling direct substitution based on electrical and mechanical parameter alignment.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HCT373MTC
Manufacturer	onsemi
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Supply Voltage Range	4.5V ~ 5.5V
Propagation Delay	25ns
Output Current (High/Low)	7.2mA / 7.2mA
Operating Temperature Range	-40°C ~ 85°C
Package Type	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MM74HCT373MTC is determined by strict equivalence in the following parameters:

Logic Type: D-Type Transparent Latch (8:8 configuration)
Output Type: Tri-State
Supply Voltage: 4.5V ~ 5.5V
Package: 20-TSSOP surface mount
Base Product Number: 74HCT373 series

Substitute parts must maintain identical logic function, circuit configuration, and physical package dimensions. Variations in propagation delay, output current, and operating temperature range are permissible when the substitute part meets or exceeds the original specifications or operates within compatible system parameters. All substitute parts listed share the same 20-TSSOP package footprint and tri-state output architecture, ensuring direct PCB compatibility.

Parameter Comparison

Part Number	Manufacturer	Status	Propagation Delay (ns)	Output Current (mA)	Temp Range (°C)	Packaging
MM74HCT373MTC	onsemi	Obsolete	25	7.2 / 7.2	-40 ~ 85	Tube
MC74HCT373ADTR2G	onsemi	Active	28	6 / 6	-55 ~ 125	Tape & Reel
74HCT373PW,118	Nexperia USA Inc.	Active	14	6 / 6	-40 ~ 125	Tape & Reel
SN74HCT373PW	Texas Instruments	Discontinued at DiGi Electronics	25	6 / 6	-40 ~ 85	Tube
SN74HCT373PWR	Texas Instruments	Active	25	6 / 6	-40 ~ 85	Tape & Reel
SN74HCT373PWT	Texas Instruments	Discontinued at DiGi Electronics	25	6 / 6	-40 ~ 85	Tape & Reel

Engineering Selection Recommendations

For applications currently using the obsolete MM74HCT373MTC, the following selection criteria apply:

Active Status Priority: SN74HCT373PWR (Texas Instruments) and MC74HCT373ADTR2G (onsemi) are actively manufactured and represent the primary substitution path. Both maintain full electrical compatibility with the original part and are available in production quantities.

Extended Temperature Range: MC74HCT373ADTR2G provides an extended operating temperature range (-55°C ~ 125°C) compared to the original specification (-40°C ~ 85°C), suitable for industrial and automotive applications requiring broader thermal performance.

Performance Enhancement: 74HCT373PW,118 (Nexperia USA Inc.) offers superior propagation delay performance (14ns versus 25ns), providing timing margin improvement for high-speed digital logic applications while maintaining full functional compatibility.

Compliance Assurance: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and identical EAR99 export classification, ensuring regulatory continuity across procurement and deployment.

Packaging Consideration: Tape & Reel packaging (TR) is preferred for production volume applications. Tube packaging alternatives exist but are limited to discontinued or obsolete product lines.

Frequently Asked Questions (FAQ)

Q: Can MM74HCT373MTC be directly replaced with any 74HCT373 variant?

A: Direct replacement is limited to parts sharing identical logic type (D-Type Transparent Latch 8:8), tri-state output, 4.5V ~ 5.5V supply voltage, and 20-TSSOP package. Manufacturer variants (onsemi, Texas Instruments, Nexperia) are interchangeable when these parameters align.

Q: What is the impact of propagation delay differences between substitute parts?

A: Propagation delay variations (14ns to 28ns) affect signal timing in digital circuits. Faster substitutes (14ns) provide timing margin; slower substitutes (28ns) require verification that system timing budgets accommodate the increased delay. The original 25ns specification is matched by multiple active alternatives.

Q: Are Tape & Reel and Tube packaging interchangeable?

A: Tape & Reel and Tube packaging contain identical die and electrical specifications. The difference is mechanical packaging format for automated assembly versus manual handling. PCB compatibility is identical; packaging selection depends on manufacturing process requirements.

Q: Does the extended temperature range of MC74HCT373ADTR2G affect electrical performance?

A: Extended temperature range (-55°C ~ 125°C) does not degrade electrical performance within the original operating range (-40°C ~ 85°C). The wider specification provides additional operational margin for extreme environment applications without compromising standard temperature operation.

Q: Which substitute part offers the best long-term availability?

A: SN74HCT373PWR (Texas Instruments, Active status) and MC74HCT373ADTR2G (onsemi, Active status) are actively manufactured and represent the most reliable long-term procurement sources. Both are available in production quantities with established supply chains.

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