MM74HCT08SJ Equivalent & Substitute Parts

Part Overview

The MM74HCT08SJ is a 4-channel 2-input AND gate logic IC manufactured by onsemi in a 14-SOP surface mount package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74HCT08 logic family provides standard AND gate functionality with TTL-compatible input and output levels, operating across the 4.5V to 5.5V supply voltage range.

Substiute Parts

MM74HCT08SJ

onsemiIn Stock: 704MM74HCT08SJ Datasheet

Current PartRFQ

CD74HCT08M

Harris CorporationIn Stock: 1565CD74HCT08M Datasheet

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CD74HCT08M96

Texas InstrumentsIn Stock: 27724CD74HCT08M96 Datasheet

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CD74HCT08ME4

Texas InstrumentsIn Stock: 854CD74HCT08ME4 Datasheet

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SN74HCT08D

Texas InstrumentsIn Stock: 2080SN74HCT08D Datasheet

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SN74HCT08DR

Texas InstrumentsIn Stock: 3773SN74HCT08DR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM74HCT08SJ is determined by the following critical parameters:

• Logic Function: All substitute parts must implement 4-channel 2-input AND gate logic
• Voltage Supply Range: 4.5V ~ 5.5V compatibility is mandatory
• Input/Output Logic Levels: TTL-compatible thresholds (0.8V low, 2V high)
• Package Type: 14-SOIC surface mount package
• Operating Temperature Range: Minimum -40°C ~ 85°C coverage required

The substitute parts listed below meet these electrical and mechanical requirements and are drawn from the 74HCT08 base product family. Substitutes are grouped by product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Preferred Substitutes (Active Product Status)

CD74HCT08M96 and SN74HCT08DR are the recommended substitutes for new designs. Both parts are currently active in production, carry ROHS3 compliance certification, and meet all electrical parameters of the MM74HCT08SJ. CD74HCT08M96 offers extended temperature range (-55°C ~ 125°C) and higher inventory availability (27,700 units). SN74HCT08DR matches the original operating temperature range (-40°C ~ 85°C) and provides faster propagation delay (22ns vs. 18ns at specified conditions).

Secondary Substitutes (Discontinued or Obsolete Status)

CD74HCT08ME4 and SN74HCT08D are discontinued at DiGi Electronics but remain available in inventory. Both carry ROHS3 compliance. CD74HCT08ME4 provides extended temperature range coverage. SN74HCT08D matches the original temperature specification and offers improved propagation delay performance.

Not Recommended

CD74HCT08M (Harris Corporation) is obsolete and RoHS non-compliant, making it unsuitable for new designs subject to environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can I directly replace MM74HCT08SJ with any of these substitute parts?

A: Yes, all listed substitutes are electrically and mechanically compatible. All parts implement 4-channel 2-input AND gate logic with identical supply voltage range (4.5V ~ 5.5V), input logic thresholds, and 14-SOIC package footprint. Propagation delay variations (18ns to 25ns) are within acceptable tolerances for standard logic applications.

Q: What is the difference between the package dimensions listed for different parts?

A: The MM74HCT08SJ specifies 14-SOIC (0.209", 5.30mm Width), while most substitutes specify 14-SOIC (0.154", 3.90mm Width). Both are standard 14-pin SOIC packages with identical pin pitch and electrical connectivity. The width difference reflects manufacturing variations within the SOIC standard. PCB footprints designed for either dimension will accommodate both package sizes.

Q: Which substitute offers the best long-term availability?

A: CD74HCT08M96 (Texas Instruments, Active status) with 27,700 units in stock is the most readily available option. SN74HCT08DR (Texas Instruments, Active status) with 3,700 units is also actively produced and represents a long-term supply source.

Q: Are there temperature range considerations for my application?

A: The MM74HCT08SJ operates -40°C ~ 85°C. SN74HCT08DR and SN74HCT08D maintain this range. CD74HCT08M96 and CD74HCT08ME4 extend to -55°C ~ 125°C, providing broader environmental coverage if required by your application.

Q: What is the significance of RoHS compliance in these parts?

A: ROHS3-compliant parts (CD74HCT08M96, CD74HCT08ME4, SN74HCT08D, SN74HCT08DR) meet European environmental regulations restricting hazardous substances. For applications subject to environmental compliance requirements, these parts are mandatory. CD74HCT08M (RoHS non-compliant) should not be used in regulated markets.