M45PE40-VMP6G Equivalent & Substitute Parts

Part Overview

The M45PE40-VMP6G is a 4Mbit NOR Flash memory IC manufactured by Micron Technology Inc., designed for SPI interface applications operating at 75 MHz. This component features a 512K x 8 memory organization in an 8-VDFPN surface mount package with exposed pad. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement continuity.

Key Parameters

Parameter	Value
Memory Size	4Mbit
Memory Organization	512K x 8
Memory Interface	SPI
Clock Frequency	75 MHz
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-VDFN Exposed Pad
Write Cycle Time (Page)	3ms
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the M45PE40-VMP6G is determined by the following critical parameters:

Memory Capacity & Organization: Must be 4Mbit with 512K x 8 organization to maintain firmware compatibility and address space requirements
Interface Protocol: SPI interface is mandatory for system-level compatibility
Supply Voltage Range: Must encompass or be compatible with the 2.7V ~ 3.6V operating range
Operating Temperature Range: Must support -40°C ~ 85°C minimum specification
Package Compatibility: 8-pin surface mount packages with exposed pad (VDFN/WSON variants) are mechanically and electrically compatible
Compliance Standards: RoHS3 compliance and MSL rating must be maintained

The W25X40CLZPIG from Winbond Electronics meets all substitution criteria as a functionally equivalent part.

Parameter Comparison

Parameter	M45PE40-VMP6G (Micron)	W25X40CLZPIG (Winbond)	Compatibility
Memory Size	4Mbit	4Mbit	Identical
Memory Organization	512K x 8	512K x 8	Identical
Memory Interface	SPI	SPI	Identical
Clock Frequency	75 MHz	104 MHz	Compatible (higher speed)
Voltage Supply Range	2.7V ~ 3.6V	2.3V ~ 3.6V	Compatible (wider range)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical
Package Type	8-VDFN Exposed Pad	8-WSON Exposed Pad	Compatible (same pincount, footprint class)
Write Cycle Time (Page)	3ms	800µs	Compatible (faster performance)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
MSL Rating	3 (168 Hours)	3 (168 Hours)	Identical

Engineering Selection Recommendations

The W25X40CLZPIG is a direct functional equivalent for the obsolete M45PE40-VMP6G. Both parts maintain ROHS3 compliance and identical MSL ratings, ensuring regulatory and manufacturing process compatibility. The Winbond substitute offers performance advantages including higher clock frequency (104 MHz vs. 75 MHz) and faster page write cycles (800µs vs. 3ms), while maintaining backward compatibility with existing firmware and system designs. The wider supply voltage range (2.3V ~ 3.6V) provides additional operational flexibility. Both parts are surface mount 8-pin packages with exposed pads, requiring equivalent PCB layout and thermal management considerations.

Frequently Asked Questions (FAQ)

Q: Can the W25X40CLZPIG directly replace the M45PE40-VMP6G without firmware modifications?

A: Yes. Both parts share identical memory capacity (4Mbit), organization (512K x 8), SPI interface, and operating temperature range. The substitute operates at higher speed and lower minimum voltage, which are backward-compatible enhancements.

Q: Are the package footprints interchangeable?

A: The M45PE40-VMP6G uses 8-VDFN packaging while the W25X40CLZPIG uses 8-WSON packaging. Both are 8-pin surface mount packages with exposed pads in 6x5mm form factors. PCB footprints are mechanically compatible, though design verification is required for specific layout implementations.

Q: What is the significance of the higher clock frequency in the W25X40CLZPIG?

A: The W25X40CLZPIG operates at 104 MHz compared to the original 75 MHz specification. This higher frequency is fully backward-compatible with systems designed for 75 MHz operation and provides performance headroom for future applications.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both the M45PE40-VMP6G and W25X40CLZPIG are ROHS3 compliant with identical MSL ratings of 3 (168 Hours), ensuring equivalent compliance with environmental and manufacturing standards.

Q: What is the practical difference in write performance between these parts?

A: The W25X40CLZPIG achieves page write cycles in 800µs versus 3ms for the M45PE40-VMP6G. This represents approximately 3.75x faster write performance, which may improve system throughput in write-intensive applications.

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