MM74HCT14MTC Equivalent & Substitute Parts

Part Overview

The MM74HCT14MTC is a 6-channel inverter IC with Schmitt trigger inputs manufactured by onsemi in 14-TSSOP surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MM74HCT14MTC operates within the 4.5V to 5.5V supply voltage range and is designed for logic signal inversion applications requiring hysteresis input characteristics.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Features	Schmitt Trigger
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Max)	1 µA
Current - Output High, Low	4.8mA, 4.8mA
Input Logic Level - Low	0.5V ~ 0.6V
Input Logic Level - High	1.9V ~ 2.1V
Max Propagation Delay @ V, Max CL	20ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-TSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MM74HCT14MTC is determined by the following criteria:

Functional Equivalence: All substitute parts must be 6-channel inverter ICs with Schmitt trigger inputs, matching the logic type and circuit configuration.

Electrical Compatibility: Supply voltage range (4.5V ~ 5.5V), input logic levels (Low: 0.5V ~ 0.6V, High: 1.9V ~ 2.1V), and output current specifications must align with the original part's operating parameters.

Package Compatibility: Primary substitutes use 14-TSSOP packaging to ensure direct PCB footprint compatibility. Secondary substitutes in 14-SSOP or 14-TVSOP packaging require board layout verification.

Series Designation: The 74HCT series designation indicates TTL-compatible CMOS logic with fixed 5V supply operation. Parts within this series maintain electrical compatibility.

Product Status: Active status parts are preferred for long-term availability. Discontinued parts serve as interim solutions only.

Parameter Comparison

Part Number	Manufacturer	Series	Supply Voltage	Quiescent Current (Max)	Output Current (High/Low)	Propagation Delay @ 5V	Operating Temp	Package	Status
MM74HCT14MTC	onsemi	74HCT	4.5V ~ 5.5V	1 µA	4.8mA / 4.8mA	20ns	-40°C ~ 85°C	14-TSSOP	Obsolete
MC74HCT14ADTR2G	onsemi	74HCT	4.5V ~ 5.5V	1 µA	4mA / 4mA	32ns	-55°C ~ 125°C	14-TSSOP	Active
74HCT14PW,118	Nexperia USA Inc.	74HCT	4.5V ~ 5.5V	2 µA	4mA / 4mA	34ns	-40°C ~ 125°C	14-TSSOP	Active
CD74HCT14PWR	Texas Instruments	74HCT	4.5V ~ 5.5V	2 µA	4mA / 4mA	38ns	-55°C ~ 125°C	14-TSSOP	Active
SN74HCT14PWR	Texas Instruments	74HCT	4.5V ~ 5.5V	2 µA	4mA / 4mA	30ns	-40°C ~ 85°C	14-TSSOP	Active
SN74HCT14DGVR	Texas Instruments	74HCT	4.5V ~ 5.5V	2 µA	4mA / 4mA	30ns	-40°C ~ 85°C	14-TVSOP	Active
SN74HCT14DBR	Texas Instruments	74HCT	4.5V ~ 5.5V	2 µA	4mA / 4mA	30ns	-40°C ~ 85°C	14-SSOP	Active
CD74HCT14PW	Texas Instruments	74HCT	4.5V ~ 5.5V	2 µA	4mA / 4mA	38ns	-55°C ~ 125°C	14-TSSOP	Discontinued

Engineering Selection Recommendations

Primary Substitutes (14-TSSOP Package):

MC74HCT14ADTR2G (onsemi) and SN74HCT14PWR (Texas Instruments) are the preferred direct replacements. Both maintain 14-TSSOP packaging for identical PCB footprint compatibility and are actively manufactured. MC74HCT14ADTR2G offers extended operating temperature range (-55°C ~ 125°C) compared to the original part's -40°C ~ 85°C specification. SN74HCT14PWR provides faster propagation delay (30ns vs. 20ns) and is available in higher volume.

74HCT14PW,118 (Nexperia USA Inc.) serves as an alternative active source with identical package and electrical specifications within the 4.5V ~ 5.5V supply range.

Secondary Substitutes (Alternative Packages):

SN74HCT14DGVR uses 14-TVSOP packaging and SN74HCT14DBR uses 14-SSOP packaging. These require PCB layout verification to confirm footprint compatibility but maintain full electrical equivalence within the 74HCT series specification.

Compliance Status:

All substitute parts listed are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Moisture sensitivity level remains MSL 1 (Unlimited) across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can MC74HCT14ADTR2G directly replace MM74HCT14MTC on the PCB?

A: Yes. Both parts use 14-TSSOP packaging with identical pin configuration and electrical specifications within the 4.5V ~ 5.5V supply range. No board layout modifications are required.

Q: What is the difference between 74HCT and 74HC series inverters?

A: The 74HCT series is optimized for TTL-compatible logic levels and operates at fixed 5V supply (4.5V ~ 5.5V). The 74HC series operates across a wider supply range (2V ~ 6V) with different input logic level thresholds. These are not directly interchangeable without circuit redesign.

Q: Why do some substitutes have longer propagation delays?

A: Propagation delay variations (20ns to 38ns) result from different manufacturing processes and temperature compensation designs across manufacturers. All values remain within acceptable limits for standard logic applications. Applications requiring the fastest response should specify SN74HCT14PWR or SN74HCT14DGVR (30ns).

Q: Are 14-SSOP and 14-TVSOP packages compatible with 14-TSSOP footprints?

A: No. While all three are 14-pin surface mount packages, they have different pitch and body dimensions. SN74HCT14DBR (14-SSOP) and SN74HCT14DGVR (14-TVSOP) require separate PCB footprints and cannot be used as drop-in replacements without board redesign.

Q: Which substitute offers the widest operating temperature range?

A: MC74HCT14ADTR2G and CD74HCT14PWR both support -55°C ~ 125°C, compared to the original part's -40°C ~ 85°C. This extended range is beneficial for industrial and automotive applications.

Q: Is CD74HCT14PW still available for new designs?

A: CD74HCT14PW is discontinued at DiGi Electronics. While limited inventory exists, it should not be selected for new designs. Use active alternatives such as CD74HCT14PWR, SN74HCT14PWR, or MC74HCT14ADTR2G instead.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message