CD74HCT32M OR Gate IC Equivalent & Substitute Parts

Part Overview

The CD74HCT32M is a 4-channel 2-input OR gate logic IC manufactured by Texas Instruments in 14-SOIC surface mount packaging. This part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The 74HCT32 logic family provides standard TTL-compatible OR gate functionality across multiple manufacturers, with several active alternatives available in compatible packaging configurations.

Substiute Parts

CD74HCT32M

Texas InstrumentsIn Stock: 940CD74HCT32M Datasheet

Current PartRFQ

CD74HCT32M96

Harris CorporationIn Stock: 3597CD74HCT32M96 Datasheet

DirectRFQ

MM74HCT32M

Fairchild SemiconductorIn Stock: 4254MM74HCT32M Datasheet

DirectRFQ

74HCT221D,118

Nexperia USA Inc.In Stock: 346274HCT221D,118 Datasheet

MFR RecommendedRFQ

74HCT32D,653

NXP SemiconductorsIn Stock: 3845074HCT32D,653 Datasheet

MFR RecommendedRFQ

74HCT32D-Q100,118

NXP USA Inc.In Stock: 7221074HCT32D-Q100,118 Datasheet

MFR RecommendedRFQ

74HCT32S14-13

Diodes IncorporatedIn Stock: 2550374HCT32S14-13 Datasheet

MFR RecommendedRFQ

MC74HCT32ADG

onsemiIn Stock: 3734MC74HCT32ADG Datasheet

MFR RecommendedRFQ

MC74HCT32ADR2G

onsemiIn Stock: 10371MC74HCT32ADR2G Datasheet

MFR RecommendedRFQ

MM74HCT32MX

Fairchild SemiconductorIn Stock: 9944MM74HCT32MX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74HCT32M is determined by the following critical parameters:

• Logic Function: All substitutes must be 4-channel 2-input OR gates (74HCT32 base product number)
• Voltage Supply Range: 4.5V ~ 5.5V compatibility required
• Package Type: 14-SOIC surface mount packaging with 0.154" (3.90mm) width
• Input/Output Logic Levels: 0.8V low threshold, 2V high threshold, 4mA output capability
• Propagation Delay: Maximum 24ns at 4.5V with 50pF load
• Operating Temperature: Minimum -40°C to 125°C range

Substitutes are grouped into three categories: direct equivalents with identical specifications, active alternatives with minor parameter variations, and automotive-qualified variants. Parts with different logic types (such as the 74HCT221 monostable multivibrator) are not functional substitutes despite sharing the 74HCT series designation.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MC74HCT32ADR2G (onsemi)

This part is the preferred substitute. It maintains full functional compatibility with the CD74HCT32M across all critical parameters: 4.5V ~ 5.5V supply voltage, 4mA output current, 0.8V/2V input thresholds, and 14-SOIC packaging. The MC74HCT32ADR2G offers superior propagation delay performance (15ns vs. 24ns) and lower quiescent current (1 µA vs. 2 µA). It is currently active in production, ROHS3 compliant, and available in Tape & Reel packaging for automated assembly. Operating temperature range extends to -55°C, matching the original part's lower limit.

Secondary Recommendation: 74HCT32D-Q100,118 (NXP USA Inc.)

This automotive-qualified variant (AEC-Q100) provides identical electrical specifications to the CD74HCT32M with 24ns propagation delay and 4mA output current. It is actively produced with high inventory availability (72,113 pcs). The automotive qualification adds design assurance for mission-critical applications. Operating temperature range is -40°C ~ 125°C, which covers most industrial and commercial requirements.

Alternative: 74HCT32S14-13 (Diodes Incorporated)

This part meets all functional requirements with identical propagation delay and output current specifications. It is actively produced and ROHS3 compliant. The quiescent current specification (20 µA) is higher than the original, which may impact low-power applications. This part is suitable for general-purpose logic applications where quiescent current is not a design constraint.

Not Recommended: CD74HCT32M96, MM74HCT32M, MM74HCT32MX

CD74HCT32M96 is obsolete and RoHS non-compliant. MM74HCT32M and MM74HCT32MX have restricted operating temperature range (-40°C ~ 85°C), which does not meet the original -55°C lower limit. These parts are suitable only for applications with relaxed temperature requirements.

Not Applicable: 74HCT221D,118

This is a monostable multivibrator, not an OR gate. Despite sharing the 74HCT series designation, it performs a different logic function and is not a functional substitute.

Frequently Asked Questions (FAQ)

Q: Can I use MC74HCT32ADR2G as a direct replacement for CD74HCT32M?

A: Yes. Both parts are 4-channel 2-input OR gates in 14-SOIC packaging with 4.5V ~ 5.5V supply voltage and compatible input/output logic levels. The MC74HCT32ADR2G actually provides faster propagation delay (15ns vs. 24ns) and lower quiescent current, making it a superior substitute. Pin-for-pin compatibility is maintained.

Q: What is the difference between 74HCT32D-Q100,118 and standard 74HCT32 parts?

A: The Q100 designation indicates AEC-Q100 automotive qualification. This part meets automotive reliability and testing standards. Electrically, it is identical to the CD74HCT32M with 24ns propagation delay and 4mA output current. Use this variant if your application requires automotive-grade components or operates in harsh environments.

Q: Why does 74HCT32S14-13 have higher quiescent current (20 µA vs. 2 µA)?

A: Quiescent current variation occurs due to manufacturing process differences between suppliers. The 20 µA specification for the Diodes Incorporated part is still within acceptable limits for most applications. However, in battery-powered or ultra-low-power designs, the lower quiescent current of MC74HCT32ADR2G (1 µA) or CD74HCT32M (2 µA) is preferable.

Q: Are all 14-SOIC packages physically identical?

A: Yes. All substitute parts use 14-SOIC (0.154", 3.90mm width) surface mount packaging. Physical dimensions and PCB footprints are identical, allowing direct board-level substitution without layout changes.

Q: Can I use MM74HCT32M if my application operates only at room temperature?

A: Yes, if your operating temperature range is -40°C ~ 85°C. However, the CD74HCT32M and recommended substitutes support -55°C operation. If future applications may require extended temperature range, use MC74HCT32ADR2G or MC74HCT32ADG to avoid redesign.

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. This is mandatory for most commercial and industrial applications sold in regulated markets. MC74HCT32ADR2G and 74HCT32S14-13 are ROHS3 compliant; verify compliance requirements for your specific application.

Q: Is CD74HCT32M96 still usable despite being obsolete?

A: CD74HCT32M96 is functionally equivalent but is obsolete and RoHS non-compliant. It should not be used in new designs. Existing inventory may be used for legacy system maintenance only, with awareness that future sourcing will be difficult.