MM74HC259N Equivalent & Substitute Parts

Part Overview

The MM74HC259N is an 8-bit addressable latch IC manufactured by onsemi, designed for digital logic applications requiring address-selectable data storage. This component features a D-type, addressable configuration with 1:8 circuit topology and standard output characteristics. The MM74HC259N is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute components must maintain functional compatibility across electrical parameters, mechanical packaging, and operational specifications.

Substiute Parts

MM74HC259N

onsemiIn Stock: 1922MM74HC259N Datasheet

Current PartRFQ

SN74HC259N

Texas InstrumentsIn Stock: 2159SN74HC259N Datasheet

DirectRFQ

CD74HC259E

Texas InstrumentsIn Stock: 1507CD74HC259E Datasheet

SimilarRFQ

SN74HC259NE4

Texas InstrumentsIn Stock: 743SN74HC259NE4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MM74HC259N are classified based on electrical and mechanical parameter alignment within the 74HC logic family. All substitute candidates maintain identical circuit topology (1:8 addressable latch), output type (standard), supply voltage range (2V ~ 6V), output current specifications (5.2mA), and package configuration (16-DIP through-hole). Substitution eligibility is determined by:

• Matching logic type and circuit configuration
• Compatible supply voltage and output current ratings
• Identical or superior propagation delay performance
• Equivalent or extended operating temperature range
• Identical mechanical package and mounting type
• Active or equivalent product status from qualified manufacturers

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SN74HC259N (Texas Instruments)

The SN74HC259N is the direct functional equivalent with active product status. This part demonstrates superior propagation delay performance (13ns versus 17ns), maintains all electrical and mechanical specifications, and carries ROHS3 compliance certification. Selection of SN74HC259N is appropriate for applications requiring immediate availability and long-term supply continuity.

Alternative Substitute: SN74HC259NE4 (Texas Instruments)

The SN74HC259NE4 provides parametric equivalence with active product status and ROHS3 compliance. Propagation delay of 14ns falls between the original and primary substitute specifications. This part is suitable for applications where the SN74HC259N is unavailable.

Extended Temperature Range Option: CD74HC259E (Texas Instruments)

The CD74HC259E maintains all core electrical specifications while extending the operating temperature range to -55°C ~ 125°C. This part is appropriate for applications requiring enhanced thermal performance or operation in extreme temperature environments. ROHS3 compliance and active product status are confirmed.

All substitute parts are qualified for direct pin-for-pin replacement in 16-DIP through-hole applications and maintain compatibility with existing PCB layouts and socket configurations.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC259N replace the MM74HC259N in existing designs?

A: Yes. The SN74HC259N is a direct functional equivalent with identical logic type, circuit configuration, supply voltage range, output current ratings, and 16-DIP package. The superior propagation delay (13ns) ensures compatibility with timing-critical applications.

Q: What is the difference between SN74HC259N and SN74HC259NE4?

A: Both parts are functionally equivalent 8-bit addressable latches from Texas Instruments with active product status. The SN74HC259NE4 exhibits a propagation delay of 14ns compared to 13ns for the SN74HC259N. Selection between these parts depends on availability and specific timing requirements.

Q: When should CD74HC259E be selected instead of SN74HC259N?

A: The CD74HC259E is selected for applications requiring operation beyond the standard -40°C ~ 85°C temperature range. The extended operating range of -55°C ~ 125°C accommodates extreme thermal environments while maintaining all other electrical specifications.

Q: Are all substitute parts RoHS compliant?

A: Yes. SN74HC259N, CD74HC259E, and SN74HC259NE4 all carry ROHS3 compliance certification. The original MM74HC259N RoHS status was not specified in available documentation.

Q: Is the 16-DIP package identical across all substitute parts?

A: Yes. All substitute parts utilize the 16-DIP (0.300", 7.62mm) package with through-hole mounting. Direct PCB layout compatibility is maintained without modification.

Q: What is the significance of propagation delay differences among substitutes?

A: Propagation delay determines the maximum switching speed of the addressable latch. The MM74HC259N specifies 17ns, while substitutes range from 13ns to 14ns. Faster propagation delays in substitute parts ensure compatibility with applications designed for the original specification and support higher-speed operation where applicable.