MC74ACT14N Equivalent & Substitute Parts

Part Overview

The MC74ACT14N is a 6-channel inverter IC with Schmitt trigger functionality in a 14-pin DIP package, manufactured by onsemi. This logic component is designed for signal inversion applications requiring hysteresis input characteristics. The part is currently obsolete, making equivalent substitutes necessary for ongoing system support and new designs requiring compatible functionality.

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 - Output High, Low	24mA, 24mA
Package / Case	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 85°C

Substitute Part Grouping Explanation

Substitution eligibility for the MC74ACT14N is determined by the following critical parameters:

Logic configuration: 6-channel inverter with 1 input per channel
Schmitt trigger hysteresis functionality
Supply voltage range: 4.5V to 5.5V
Output drive capability: 24mA minimum for both high and low states
Package compatibility: 14-pin DIP form factor with 0.300" (7.62mm) spacing
Mounting method: Through-hole technology

The identified substitutes maintain these core electrical and mechanical specifications, enabling direct replacement in existing circuit designs.

Parameter Comparison

Parameter	MC74ACT14N (onsemi)	CD74ACT14E (Harris)	SN74ACT14N (Texas Instruments)
Logic Type	Inverter	Inverter	Inverter
Number of Circuits	6	6	6
Number of Inputs	1	1	1
Features	Schmitt Trigger	—	Schmitt Trigger
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Max)	4 µA	4 µA	2 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA
Max Propagation Delay @ 5V, 50pF	11.5ns	14.5ns	11.5ns
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 85°C
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Obsolete	Active
RoHS Status	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

SN74ACT14N (Texas Instruments) is the primary substitute for new designs and ongoing production. This part maintains identical electrical performance to the MC74ACT14N with matching propagation delay (11.5ns) and operating temperature range (-40°C ~ 85°C). The SN74ACT14N holds active product status and meets ROHS3 compliance requirements, providing long-term availability and regulatory alignment.

CD74ACT14E (Harris Corporation) serves as an alternative substitute where supply constraints exist. This part meets all core electrical specifications and maintains the same package form factor. The extended operating temperature range (-55°C ~ 125°C) provides additional thermal margin for demanding applications. However, the CD74ACT14E is obsolete and carries RoHS non-compliance status, making it suitable only for legacy system maintenance where regulatory requirements do not apply.

Both substitutes are electrically compatible with the MC74ACT14N in standard 5V logic applications requiring 6-channel inversion with Schmitt trigger input characteristics.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT14N directly replace the MC74ACT14N without circuit modification?

A: Yes. The SN74ACT14N maintains identical supply voltage range (4.5V ~ 5.5V), output drive capability (24mA), propagation delay (11.5ns @ 5V, 50pF), and 14-pin DIP package configuration. Direct socket substitution is supported.

Q: What is the difference between the CD74ACT14E and SN74ACT14N?

A: Both parts provide equivalent 6-channel inverter functionality with matching output drive and supply specifications. The CD74ACT14E offers extended operating temperature range (-55°C ~ 125°C) versus -40°C ~ 85°C for the SN74ACT14N. The SN74ACT14N is active and ROHS3 compliant, while the CD74ACT14E is obsolete and RoHS non-compliant.

Q: Does the CD74ACT14E lack Schmitt trigger functionality?

A: The CD74ACT14E datasheet does not specify Schmitt trigger as a featured characteristic, though the core inverter function remains compatible. For applications requiring explicit hysteresis input behavior, the SN74ACT14N or MC74ACT14N are preferred.

Q: Are these parts suitable for 3.3V logic systems?

A: No. All three parts require supply voltage in the 4.5V ~ 5.5V range and are not specified for 3.3V operation.

Q: What is the quiescent current difference between these parts?

A: The MC74ACT14N and CD74ACT14E specify 4 µA maximum quiescent current, while the SN74ACT14N specifies 2 µA maximum. This difference is negligible for most applications but may be relevant in ultra-low-power designs.

Q: Can these parts be used in new product designs?

A: The SN74ACT14N is recommended for new designs due to active product status and ROHS3 compliance. The MC74ACT14N and CD74ACT14E are obsolete and should be used only for legacy system support or replacement applications.

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