MM74HC32N Equivalent & Substitute Parts

Part Overview

The MM74HC32N is a 4-channel 2-input OR Gate logic IC manufactured by onsemi in 14-MDIP packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MM74HC32N operates across a supply voltage range of 2V to 6V and is designed for through-hole mounting applications. Substitute parts must maintain functional equivalence as a 4-channel OR gate while meeting the electrical and mechanical specifications required for direct board-level replacement.

Key Parameters

Parameter	Value
Logic Type	OR Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	5.2mA, 5.2mA
Input Logic Level - Low	0.5V ~ 1.8V
Input Logic Level - High	1.5V ~ 4.2V
Max Propagation Delay @ 6V, 50pF	17ns
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)
Base Product Number	74HC32

Substitute Part Grouping Explanation

Substitution of the MM74HC32N is determined by strict adherence to the following criteria:

Functional Equivalence: All substitute parts must be 4-channel, 2-input OR gates with the 74HC32 base product number.

Electrical Compatibility: Supply voltage range (2V ~ 6V), quiescent current (2 µA max), output current (5.2mA), and input logic levels must be maintained or exceeded.

Mechanical Compatibility: All substitute parts must use 14-DIP through-hole packaging with 0.300" (7.62mm) pitch to ensure direct board-level replacement without layout modifications.

Propagation Delay: Maximum propagation delay at 6V with 50pF load must not exceed 17ns to maintain timing performance in existing designs.

Operating Temperature Range: Substitute parts must support the -40°C ~ 85°C operating range or provide an extended range that encompasses this specification.

Substitute parts are categorized as follows:

Direct Manufacturer Equivalents: CD74HC32E and SN74HC32NE4 meet all electrical and mechanical specifications with identical or superior performance characteristics.

Direct Manufacturer Equivalent: SN74HC32N provides identical electrical specifications and packaging.

Similar Manufacturer Part: SN74HC32AN offers extended operating temperature range (-55°C ~ 125°C) with minor variations in input logic level thresholds and propagation delay.

Parameter Comparison

Parameter	MM74HC32N (onsemi)	CD74HC32E (TI)	SN74HC32N (TI)	SN74HC32AN (TI)	SN74HC32NE4 (TI)
Logic Type	OR Gate	OR Gate	OR Gate	OR Gate	OR Gate
Number of Circuits	4	4	4	4	4
Number of Inputs	2	2	2	2	2
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Current - Quiescent (Max)	2 µA	2 µA	2 µA	2 µA	2 µA
Current - Output High, Low	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA
Input Logic Level - Low	0.5V ~ 1.8V	0.5V ~ 1.8V	0.5V ~ 1.8V	0.3V ~ 1.2V	0.5V ~ 1.8V
Input Logic Level - High	1.5V ~ 4.2V	1.5V ~ 4.2V	1.5V ~ 4.2V	1.5V ~ 4.2V	1.5V ~ 4.2V
Max Propagation Delay @ 6V, 50pF	17ns	15ns	17ns	20ns	17ns
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Base Product Number	74HC32	74HC32	74HC32	74HC32	74HC32
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes: CD74HC32E, SN74HC32N, and SN74HC32NE4 are recommended as direct replacements for the obsolete MM74HC32N. All three parts are manufactured by Texas Instruments, maintain active product status, and provide ROHS3 compliance. CD74HC32E offers improved propagation delay performance (15ns versus 17ns) and extended operating temperature range (-55°C ~ 125°C), making it suitable for applications requiring enhanced thermal performance. SN74HC32N and SN74HC32NE4 provide identical electrical specifications to the original MM74HC32N with the advantage of active product status and regulatory compliance.

Secondary Substitute: SN74HC32AN is suitable for applications requiring extended operating temperature range (-55°C ~ 125°C). This part exhibits a maximum propagation delay of 20ns at 6V with 50pF load, which remains within acceptable timing margins for most 74HC32 applications. Input logic level thresholds differ slightly (0.3V ~ 1.2V for low level), requiring verification against specific circuit requirements.

All substitute parts are available in active production status with established supply chains, ensuring long-term component availability and procurement reliability.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC32E directly replace the MM74HC32N without circuit modifications?

A: Yes. The CD74HC32E maintains identical supply voltage range (2V ~ 6V), output current specifications (5.2mA), and 14-DIP through-hole packaging. The improved propagation delay (15ns versus 17ns) and extended operating temperature range provide enhanced performance without requiring design changes.

Q: What is the difference between SN74HC32N and SN74HC32AN?

A: Both parts are 4-channel 2-input OR gates in 14-DIP packaging. SN74HC32AN provides an extended operating temperature range (-55°C ~ 125°C) compared to SN74HC32N (-40°C ~ 85°C). SN74HC32AN exhibits a maximum propagation delay of 20ns versus 17ns for SN74HC32N. Input logic level thresholds for SN74HC32AN are 0.3V ~ 1.2V (low) versus 0.5V ~ 1.8V (low) for SN74HC32N. Selection depends on specific temperature and timing requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. CD74HC32E, SN74HC32N, SN74HC32AN, and SN74HC32NE4 are all ROHS3 compliant, meeting environmental and regulatory requirements for modern electronics manufacturing.

Q: What packaging considerations apply to these substitutes?

A: All substitute parts use 14-DIP through-hole packaging with 0.300" (7.62mm) pitch,

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