MM74HCT14MX Equivalent & Substitute Parts

Part Overview

The MM74HCT14MX is a 6-channel inverter IC with Schmitt trigger inputs manufactured by onsemi in 14-SOIC surface mount packaging. This logic component operates within the 74HCT series standard and is actively produced. Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when extended temperature range operation is needed for specific applications.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Features	Schmitt Trigger
Voltage Supply Range	4.5V ~ 5.5V
Package Type	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HCT14MX is determined by the following criteria:

Mandatory Parameters for Direct Substitution:

Logic Type: Inverter
Number of Circuits: 6
Number of Inputs: 1
Features: Schmitt Trigger
Voltage Supply Range: 4.5V ~ 5.5V
Package Type: 14-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Allowable Variations:

Manufacturer identity (onsemi, Texas Instruments, Nexperia USA Inc., Diodes Incorporated, Harris Corporation)
Packaging format (Cut Tape & Digi-Reel, Tube, Tape & Reel)
Quiescent current specifications (1 µA to 20 µA maximum)
Output current ratings (4 mA to 4.8 mA)
Propagation delay (20 ns to 38 ns at specified voltage and load)
Operating temperature range extensions (-55°C to 125°C upper limits)
Product status (Active, Discontinued, Obsolete)
RoHS compliance status

All substitute parts listed maintain the core 74HCT14 base product number and are functionally equivalent within the specified electrical parameters.

Parameter Comparison

Part Number	Manufacturer	Packaging	Voltage Supply	Quiescent Current (Max)	Output Current (High/Low)	Propagation Delay @ V, CL	Operating Temperature	Product Status	RoHS Status
MM74HCT14MX	onsemi	Cut Tape & Digi-Reel	4.5V ~ 5.5V	1 µA	4.8mA / 4.8mA	20ns @ 5V, 50pF	-40°C ~ 85°C	Active	ROHS3 Compliant
MC74HCT14ADG	onsemi	Tube	4.5V ~ 5.5V	1 µA	4mA / 4mA	32ns @ 5V, 50pF	-55°C ~ 125°C	Active	ROHS3 Compliant
MC74HCT14ADR2G	onsemi	Tape & Reel	4.5V ~ 5.5V	1 µA	4mA / 4mA	32ns @ 5V, 50pF	-55°C ~ 125°C	Active	ROHS3 Compliant
74HCT14S14-13	Diodes Incorporated	Tape & Reel	4.5V ~ 5.5V	20 µA	4mA / 4mA	34ns @ 4.5V, 50pF	-40°C ~ 125°C	Active	ROHS3 Compliant
CD74HCT14M96	Harris Corporation	Not specified	4.5V ~ 5.5V	2 µA	4mA / 4mA	38ns @ 4.5V, 50pF	-55°C ~ 125°C	Obsolete	RoHS non-compliant
74HCT14D,653	Nexperia USA Inc.	Cut Tape & Digi-Reel	4.5V ~ 5.5V	2 µA	4mA / 4mA	34ns @ 4.5V, 50pF	-40°C ~ 125°C	Active	ROHS3 Compliant
CD74HCT14M	Texas Instruments	Tube	4.5V ~ 5.5V	2 µA	4mA / 4mA	38ns @ 4.5V, 50pF	-55°C ~ 125°C	Discontinued at DiGi Electronics	ROHS3 Compliant
CD74HCT14MT	Texas Instruments	Tape & Reel	4.5V ~ 5.5V	2 µA	4mA / 4mA	38ns @ 4.5V, 50pF	-55°C ~ 125°C	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74HCT14D	Texas Instruments	Tube	4.5V ~ 5.5V	2 µA	4mA / 4mA	30ns @ 5.5V, 50pF	-40°C ~ 85°C	Obsolete	ROHS3 Compliant
SN74HCT14DR	Texas Instruments	Cut Tape & Digi-Reel	4.5V ~ 5.5V	2 µA	4mA / 4mA	30ns @ 5.5V, 50pF	-40°C ~ 85°C	Active	ROHS3 Compliant
SN74HCT14DT	Texas Instruments	Tape & Reel	4.5V ~ 5.5V	2 µA	4mA / 4mA	30ns @ 5.5V, 50pF	-40°C ~ 85°C	Discontinued at DiGi Electronics	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, ROHS3 Compliant):

MC74HCT14ADR2G and MC74HCT14ADG from onsemi provide direct functional equivalence with extended temperature range (-55°C to 125°C) and are actively produced. These are suitable for applications requiring broader operating temperature specifications.

SN74HCT14DR from Texas Instruments maintains identical temperature range to the MM74HCT14MX (-40°C to 85°C) and is actively produced in Cut Tape & Digi-Reel packaging, matching the original packaging format.

74HCT14D,653 from Nexperia USA Inc. is actively produced and ROHS3 compliant with extended temperature range support (-40°C to 125°C).

74HCT14S14-13 from Diodes Incorporated is actively produced and offers extended temperature range (-40°C to 125°C) with ROHS3 compliance.

Secondary Substitutes (Discontinued or Obsolete Status):

CD74HCT14M and CD74HCT14MT from Texas Instruments are discontinued at DiGi Electronics but remain ROHS3 compliant. These are suitable only when existing inventory is available and no active alternatives are required.

SN74HCT14D and SN74HCT14DT from Texas Instruments are obsolete. Use only when no active alternatives meet application requirements.

Not Recommended:

CD74HCT14M96 from Harris Corporation is obsolete and RoHS non-compliant. This part should not be selected for new designs or applications requiring RoHS compliance.

Frequently Asked Questions (FAQ)

Q: Can I substitute MM74HCT14MX with any 74HCT14 variant?

A: No. Substitution is limited to parts with identical logic configuration (6-channel inverter with Schmitt trigger), supply voltage range (4.5V to 5.5V), and 14-SOIC package. Variants from different manufacturers or with different package types are not interchangeable without design modification.

Q: What is the difference between Cut Tape & Digi-Reel, Tube, and Tape & Reel packaging?

A: These are packaging and delivery formats that affect manufacturing processes. Cut Tape & Digi-Reel is suitable for automated pick-and-place equipment with individual component feeding. Tube packaging is used for manual assembly or lower-volume production. Tape & Reel is standard for high-volume automated assembly. The electrical and functional characteristics remain identical across all packaging formats.

Q: Does propagation delay variation affect substitution compatibility?

A: Propagation delay differences (20 ns to 38 ns) are within the 74HCT14 series specification and do not prevent substitution. However, applications with strict timing requirements should verify that the substitute part's propagation delay meets the circuit's timing constraints.

Q: Can I use parts with extended temperature range (-55°C to 125°C) in place of the standard range (-40°C to 85°C)?

A: Yes. Extended temperature range parts are backward compatible with standard temperature range applications. The extended range provides additional operational margin and is suitable for harsh environment applications.

Q: Why is CD74HCT14M96 listed if it is not recommended?

A: CD74HCT14M96 is included for reference and historical compatibility tracking. It is obsolete and RoHS non-compliant, making it unsuitable for new designs. Existing systems using this part should plan migration to active, compliant alternatives.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. For applications subject to environmental or regulatory requirements, ROHS3 compliant parts are mandatory. Non-compliant parts may not be acceptable for certain markets or applications.

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