MM74HC32SJ OR Gate IC Equivalent & Substitute Parts

Part Overview

The MM74HC32SJ is a 4-channel 2-input OR gate logic IC manufactured by onsemi in 14-SOP surface mount packaging. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74HC32 logic family provides standard OR gate functionality across the CMOS 74HC series, with multiple manufacturers offering compatible alternatives that maintain electrical and mechanical compatibility.

Substiute Parts

MM74HC32SJ

onsemiIn Stock: 857MM74HC32SJ Datasheet

Current PartRFQ

MM74HC32MX

Fairchild SemiconductorIn Stock: 18461MM74HC32MX Datasheet

DirectRFQ

SN74HC32NSR

Texas InstrumentsIn Stock: 3304SN74HC32NSR Datasheet

DirectRFQ

74HC32D,653

Nexperia USA Inc.In Stock: 375574HC32D,653 Datasheet

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CD74HC32M

Harris CorporationIn Stock: 1313CD74HC32M Datasheet

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CD74HC32M96

Texas InstrumentsIn Stock: 24770CD74HC32M96 Datasheet

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CD74HC32MT

Texas InstrumentsIn Stock: 1127CD74HC32MT Datasheet

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SN74HC32D

Texas InstrumentsIn Stock: 2568SN74HC32D Datasheet

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SN74HC32DR

Texas InstrumentsIn Stock: 5866SN74HC32DR Datasheet

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SN74HC32DT

Texas InstrumentsIn Stock: 1106SN74HC32DT Datasheet

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TC74HC32AF(EL,F)

Toshiba Semiconductor and StorageIn Stock: 1096TC74HC32AF(EL,F) Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MM74HC32SJ are classified based on strict electrical and mechanical compatibility criteria. All substitute parts must maintain the following parameters to ensure direct functional replacement:

Critical Substitution Parameters:

• Logic Type: OR Gate (4-channel, 2-input configuration)
• Voltage Supply Range: 2V to 6V minimum
• Input/Output Logic Levels: Within specified thresholds
• Mounting Type: Surface Mount
• Propagation Delay: Maximum 17ns @ 6V, 50pF (or better)
• Operating Temperature: Minimum -40°C to 85°C coverage
• Moisture Sensitivity Level: 1 (Unlimited)

Substitutes are grouped into two categories:

Direct Substitutes (Pin-Compatible, Identical Electrical Performance):

• MM74HC32MX (Fairchild Semiconductor)
• SN74HC32NSR (Texas Instruments)
• 74HC32D,653 (Nexperia USA Inc.)
• SN74HC32DR (Texas Instruments)

Compatible Substitutes (Enhanced or Extended Specifications):

• CD74HC32M96 (Texas Instruments) - Extended temperature range, improved propagation delay
• CD74HC32MT (Texas Instruments) - Extended temperature range, improved propagation delay
• SN74HC32D (Texas Instruments) - Discontinued at DiGi Electronics
• SN74HC32DT (Texas Instruments) - Discontinued at DiGi Electronics
• TC74HC32AF(EL,F) (Toshiba Semiconductor) - Improved propagation delay, lower quiescent current
• CD74HC32M (Harris Corporation) - Obsolete status, extended temperature range

Parameter Comparison

Engineering Selection Recommendations

For Active Production (Recommended Primary Choices):

SN74HC32NSR (Texas Instruments) is the primary recommended substitute. It maintains identical electrical specifications to the MM74HC32SJ, operates across the full -40°C to 85°C temperature range, and carries ROHS3 compliance certification. This part is actively manufactured and widely available.

SN74HC32DR (Texas Instruments) provides an alternative active source with identical electrical performance and ROHS3 compliance. Both parts are suitable for direct replacement in existing designs.

For Extended Temperature Applications:

74HC32D,653 (Nexperia USA Inc.) and CD74HC32M96 (Texas Instruments) extend the operating temperature range to -40°C to 125°C while improving propagation delay to 15ns. Both carry ROHS3 compliance and are actively produced. These parts are appropriate when designs require operation beyond the standard 85°C upper limit.

For Optimized Performance:

TC74HC32AF(EL,F) (Toshiba Semiconductor and Storage) offers the fastest propagation delay at 13ns and the lowest quiescent current at 1 µA. This part maintains the original -40°C to 85°C temperature range and carries RoHS compliance. Selection of this part is justified when propagation delay optimization is a design requirement.

Parts to Avoid for New Designs:

CD74HC32MT, SN74HC32D, SN74HC32DT, and CD74HC32M are either obsolete or discontinued at DiGi Electronics. MM74HC32MX (Fairchild Semiconductor) is active but uses a narrower package body (3.90mm vs. 5.30mm width), requiring PCB layout verification before substitution.

Frequently Asked Questions (FAQ)

Q: Can I substitute MM74HC32SJ with any 74HC32 part number?

A: No. While all parts share the 74HC32 base product number, substitution requires verification of critical parameters: voltage supply range (2V-6V minimum), operating temperature coverage (-40°C to 85°C minimum), propagation delay (17ns maximum), and package compatibility. Package body width differences (3.90mm vs. 5.30mm) may require PCB layout changes.

Q: What is the difference between 14-SOIC (0.154", 3.90mm) and 14-SOIC (0.209", 5.30mm)?

A: Both are 14-pin SOIC packages, but the body width differs. The 0.209" (5.30mm) width is the original narrow-body SOIC, while 0.154" (3.90mm) is a more compact variant. These are not mechanically interchangeable on the same PCB footprint without layout modification. Verify your PCB design specifications before selecting a substitute with a different body width.

Q: Is the MM74HC32MX a suitable direct replacement?

A: MM74HC32MX maintains identical electrical specifications but uses a 3.90mm body width package compared to the original 5.30mm width. If your PCB footprint is designed for the wider 5.30mm package, this part requires PCB layout verification and potential rework. For guaranteed compatibility without layout changes, select SN74HC32NSR or SN74HC32DR.

Q: Why do some substitutes have better propagation delay (15ns or 13ns) than the original (17ns)?

A: Improved propagation delay represents enhanced performance within the same logic family. Parts like CD74HC32M96 (15ns) and TC74HC32AF(EL,F) (13ns) meet or exceed the original specification. These parts are fully compatible and provide performance margin for timing-critical applications.

Q: What does ROHS3 compliance mean for my application?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. If your application or market requires RoHS compliance, select parts marked ROHS3 Compliant or RoHS Compliant. Avoid CD74HC32M (RoHS non-compliant) for regulated applications.

Q: Can I use parts with extended temperature ranges (-55°C to 125°C) in standard applications?

A: Yes. Extended temperature range parts like CD74HC32M96 and CD74HC32MT are fully backward compatible with standard temperature range applications. They provide additional operational margin at no functional cost and are appropriate for designs that may encounter extreme environmental conditions.

Q: What is Moisture Sensitivity Level (MSL) 1?

A: MSL 1 indicates unlimited shelf life and no moisture sensitivity precautions required during storage or handling. All listed substitutes carry MSL 1 rating, eliminating moisture-related reliability concerns.