MM74HCT32N OR Gate IC Equivalent & Substitute Parts

Part Overview

The MM74HCT32N is a 4-channel 2-input OR gate logic IC manufactured by onsemi in a 14-MDIP through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The 74HCT series represents a standard logic family with consistent functional and electrical characteristics across multiple manufacturers, enabling direct substitution based on matching electrical parameters and package specifications.

Substiute Parts

MM74HCT32N

onsemiIn Stock: 2074MM74HCT32N Datasheet

Current PartRFQ

CD74HCT32E

Harris CorporationIn Stock: 2264CD74HCT32E Datasheet

DirectRFQ

SN74HCT32N

Texas InstrumentsIn Stock: 2494SN74HCT32N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM74HCT32N is determined by the following critical parameters:

• Logic Function: All substitute parts must implement a 4-channel 2-input OR gate function
• Electrical Specifications: Supply voltage range (4.5V ~ 5.5V), input logic levels, and output current ratings must be compatible
• Package Compatibility: 14-DIP through-hole package with 0.300" (7.62mm) pitch is required for direct PCB substitution
• Base Series: All parts share the 74HCT base product number, indicating functional equivalence within the standard logic family

The identified substitute parts CD74HCT32E and SN74HCT32N meet these criteria and are electrically interchangeable with the MM74HCT32N in applications requiring 4-channel OR gate functionality.

Parameter Comparison

Engineering Selection Recommendations

SN74HCT32N (Texas Instruments) is the primary recommended substitute for new designs and ongoing production. This part maintains active product status, ensuring continued availability and manufacturer support. The SN74HCT32N is RoHS3 compliant and carries REACH unaffected certification, meeting current regulatory requirements for commercial and industrial applications.

CD74HCT32E (Harris Corporation) is an alternative substitute for legacy system maintenance where component sourcing from multiple manufacturers is required. This part is obsolete and carries RoHS non-compliant status, limiting its use to applications where regulatory compliance is not mandated. The extended operating temperature range (-55°C ~ 125°C) provides additional thermal margin for harsh environment applications.

Both substitute parts are electrically and mechanically compatible with the MM74HCT32N and share identical logic function, supply voltage specifications, and package configuration.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT32E and SN74HCT32N be used interchangeably with the MM74HCT32N?

A: Yes. All three parts implement identical 4-channel 2-input OR gate logic with matching supply voltage ranges (4.5V ~ 5.5V), input logic levels, and 14-DIP through-hole package specifications. Direct substitution is supported without circuit modification.

Q: What is the difference in propagation delay between these parts?

A: Propagation delay specifications vary: MM74HCT32N operates at 20ns @ 5V with 15pF load, CD74HCT32E at 24ns @ 4.5V with 50pF load, and SN74HCT32N at 22ns @ 5.5V with 50pF load. These differences are within the 74HCT logic family tolerance and do not affect functional compatibility in standard digital logic applications.

Q: Why is the MM74HCT32N marked as obsolete?

A: Obsolete status indicates the manufacturer (onsemi) has discontinued production. Substitute parts from active manufacturers such as Texas Instruments ensure continued component availability for production and maintenance requirements.

Q: Are there compliance differences between the substitute parts?

A: Yes. The SN74HCT32N is RoHS3 compliant and REACH unaffected, meeting current environmental regulations. The CD74HCT32E is RoHS non-compliant and obsolete, suitable only for legacy applications where regulatory compliance is not required.

Q: Can these parts be used in surface-mount applications?

A: No. All three parts are through-hole mounted devices in 14-DIP packages. Surface-mount alternatives would require different package types (such as SOIC or TSSOP) and are not covered by this substitution analysis.