LE25U40CMCS00-AH Equivalent & Substitute Parts

Part Overview

The LE25U40CMCS00-AH is a 4Mbit FLASH memory IC manufactured by onsemi, featuring SPI interface operation at 40 MHz. This component is classified as obsolete product status. Due to its obsolete designation, identifying functionally equivalent substitute parts is essential for design continuity, procurement planning, and system maintenance where this memory IC is specified in existing applications.

Substiute Parts

LE25U40CMCS00-AH

onsemiIn Stock: 976LE25U40CMCS00-AH Datasheet

Current PartRFQ

LE25U40CMDTWG

onsemiIn Stock: 14509LE25U40CMDTWG Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LE25U40CMCS00-AH are identified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Matching Parameters:

• Memory Size: 4Mbit
• Memory Organization: 512K x 8
• Memory Interface: SPI
• Clock Frequency: 40 MHz
• Write Cycle Time: 5ms
• Voltage Supply Range: 2.3V ~ 3.6V
• Operating Temperature Range: -40°C ~ 85°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

The LE25U40CMDTWG qualifies as a direct substitute based on identical electrical specifications and compatible packaging. Both parts share the same base product number (LE25U40) and maintain full parameter equivalence across memory capacity, interface protocol, frequency rating, and thermal operating range.

Parameter Comparison

Engineering Selection Recommendations

The LE25U40CMDTWG is a direct functional equivalent to the LE25U40CMCS00-AH. Both parts are manufactured by onsemi and share identical electrical and mechanical specifications. The primary distinction is packaging format: the main part uses 8-SOP-J packaging while the substitute uses 8-SOIC packaging. Both packages maintain the same physical dimensions (0.154", 3.90mm Width) and are surface-mount compatible.

The LE25U40CMDTWG carries ROHS3 compliance certification, providing additional regulatory alignment for applications subject to RoHS requirements. Both parts maintain obsolete product status, indicating that long-term availability through standard distribution channels may be limited.

Frequently Asked Questions (FAQ)

Q: Can LE25U40CMDTWG replace LE25U40CMCS00-AH in existing designs?

A: Yes. Both parts are electrically and mechanically equivalent across all specified parameters including memory capacity, interface protocol, frequency rating, voltage range, and temperature operating range. The 8-SOIC and 8-SOP-J packages are physically compatible for surface-mount applications with identical footprint dimensions.

Q: What is the difference between 8-SOP-J and 8-SOIC packaging?

A: Both are 8-pin surface-mount packages with identical physical dimensions (0.154", 3.90mm Width). The designations reflect different packaging standards but maintain full mechanical and electrical compatibility for PCB assembly and circuit operation.

Q: Are there compliance differences between the two parts?

A: The LE25U40CMDTWG is certified ROHS3 compliant, while RoHS status is not specified for the LE25U40CMCS00-AH. For applications requiring RoHS compliance, the LE25U40CMDTWG is the appropriate selection.

Q: What should be considered given both parts are obsolete?

A: Obsolete product status indicates limited future availability through standard distribution channels. Procurement planning should account for potential supply constraints. Current inventory levels should be verified with authorized distributors before finalizing component selection for new production volumes.

Q: Are the SPI interface specifications identical?

A: Yes. Both parts operate at 40 MHz clock frequency with 5ms write cycle time and support identical voltage supply range (2.3V ~ 3.6V) and operating temperature range (-40°C ~ 85°C).