LE25U40CMDTWG Equivalent & Substitute Parts

Part Overview

The LE25U40CMDTWG is a 4Mbit SPI FLASH memory IC manufactured by onsemi, designed for non-volatile data storage applications requiring SPI interface communication. This device operates at 40 MHz with a supply voltage range of 2.3V to 3.6V and is housed in an 8-SOIC package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design considerations.

Substiute Parts

LE25U40CMDTWG

onsemiIn Stock: 14509LE25U40CMDTWG Datasheet

Current PartRFQ

MX25V4006EM1I-13G

MacronixIn Stock: 18304MX25V4006EM1I-13G Datasheet

DirectRFQ

AT25XE041B-SSHN-B

Renesas Electronics CorporationIn Stock: 1064AT25XE041B-SSHN-B Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LE25U40CMDTWG is determined by strict alignment of the following core parameters:

• Memory capacity: 4Mbit
• Memory organization: 512K x 8
• Interface protocol: SPI
• Package type: 8-SOIC (0.154", 3.90mm Width)
• Supply voltage compatibility: minimum 2.3V support
• Operating temperature range: -40°C to 85°C minimum
• RoHS3 compliance

Substitute parts must maintain these specifications to ensure functional and physical compatibility. Clock frequency, write cycle time, and voltage supply upper limits may vary within acceptable engineering tolerances for SPI FLASH memory devices.

Parameter Comparison

Engineering Selection Recommendations

MX25V4006EM1I-13G (Macronix) provides functional equivalence with higher clock frequency (75 MHz) and improved write performance. However, the package designation differs (8-SOP versus 8-SOIC), requiring PCB layout verification. This part carries "Not For New Designs" status, limiting its suitability for long-term applications.

AT25XE041B-SSHN-B (Renesas Electronics Corporation) offers the most favorable characteristics for substitution. It maintains 8-SOIC package compatibility, supports the full operating temperature range, and carries Active product status suitable for new designs. The extended voltage supply range (1.65V ~ 3.6V) provides additional design flexibility. RoHS3 compliance is confirmed across all three parts.

Frequently Asked Questions (FAQ)

Q: Can MX25V4006EM1I-13G replace LE25U40CMDTWG directly on the PCB?

A: Physical substitution requires verification. While both are 8-pin SOP/SOIC packages with 0.154" width, MX25V4006EM1I-13G uses 8-SOP packaging versus the 8-SOIC of the original part. Pin pitch and lead configuration must be confirmed against PCB footprint specifications before installation.

Q: Is AT25XE041B-SSHN-B suitable for new product designs?

A: Yes. AT25XE041B-SSHN-B carries Active product status and ROHS3 compliance, making it appropriate for new designs requiring 4Mbit SPI FLASH memory in 8-SOIC packaging.

Q: What are the voltage supply compatibility requirements?

A: The original LE25U40CMDTWG requires minimum 2.3V supply. Both substitute parts support this minimum threshold. AT25XE041B-SSHN-B extends the lower limit to 1.65V, providing additional operational margin in low-voltage applications.

Q: Do all parts support the same SPI clock frequency?

A: No. LE25U40CMDTWG operates at 40 MHz, while MX25V4006EM1I-13G supports 75 MHz and AT25XE041B-SSHN-B supports 85 MHz. Higher clock frequencies in substitute parts are backward compatible with 40 MHz system designs.

Q: Are there moisture sensitivity differences between these parts?

A: Yes. LE25U40CMDTWG has MSL 2 (1 Year), MX25V4006EM1I-13G has MSL 3 (168 Hours), and AT25XE041B-SSHN-B has MSL 1 (Unlimited). Storage and handling requirements differ accordingly.