IS25LD040-JNLE Equivalent & Substitute Parts

Part Overview

The IS25LD040-JNLE is a 4Mbit SPI FLASH memory IC manufactured by ISSI (Integrated Silicon Solution Inc) in an 8-SOIC package. This non-volatile memory device operates at 100 MHz and is designed for applications requiring serial peripheral interface access to flash storage. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support, redesigns, and production continuity.

Key Parameters

Parameter	Value
Memory Size	4Mbit
Memory Organization	512K x 8
Memory Interface	SPI
Clock Frequency	100 MHz
Voltage Supply Range	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 105°C
Package Type	8-SOIC
Write Cycle Time	5ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the IS25LD040-JNLE is determined by the following critical parameters:

Memory Capacity: Must be 4Mbit with 512K x 8 organization
Interface Protocol: Must support SPI communication
Package Compatibility: Must use 8-SOIC or equivalent footprint
Voltage Compatibility: Operating supply voltage must overlap with 2.3V ~ 3.6V range
Temperature Range: Must support at least the -40°C to 105°C operating window
Compliance: RoHS3 compliance required for regulatory alignment

The two substitute parts identified meet these core substitution criteria, though with variations in clock frequency and temperature specifications that must be evaluated for specific application requirements.

Parameter Comparison

Parameter	IS25LD040-JNLE (Main)	AT25XE041B-SSHNHR-T	LE25U40CMC-AH
Manufacturer	ISSI	Renesas Electronics	onsemi
Memory Size	4Mbit	4Mbit	4Mbit
Memory Organization	512K x 8	512K x 8	512K x 8
Memory Interface	SPI	SPI	SPI
Clock Frequency	100 MHz	85 MHz	40 MHz
Voltage Supply Range	2.3V ~ 3.6V	1.65V ~ 3.6V	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 85°C
Package Type	8-SOIC	8-SOIC	8-SOIC
Write Cycle Time	5ms	2.75ms	5ms
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

AT25XE041B-SSHNHR-T (Renesas Electronics): This substitute offers active product status with extended temperature range (-40°C ~ 125°C) and improved moisture sensitivity rating (MSL 1). Clock frequency is reduced to 85 MHz, which remains suitable for most SPI FLASH applications. Voltage supply range is broader (1.65V ~ 3.6V), providing additional design flexibility. Write cycle time is faster at 2.75ms. RoHS3 compliance is maintained.

LE25U40CMC-AH (onsemi): This substitute maintains identical voltage supply range (2.3V ~ 3.6V) and write cycle time (5ms) as the original part, ensuring direct functional compatibility in most applications. Active product status and RoHS3 compliance are confirmed. Clock frequency is reduced to 40 MHz, which may limit use in high-speed SPI applications. Operating temperature range is narrower (-40°C ~ 85°C), requiring verification for applications requiring the full 105°C upper limit.

Both substitutes are RoHS3 compliant and available in active production status, supporting long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can AT25XE041B-SSHNHR-T replace IS25LD040-JNLE in all applications?

A: AT25XE041B-SSHNHR-T is functionally compatible for SPI FLASH applications requiring 4Mbit capacity. The 85 MHz clock frequency is lower than the original 100 MHz specification. Applications operating at or below 85 MHz will function without modification. Applications requiring 100 MHz operation must be re-evaluated or use LE25U40CMC-AH if lower frequency is acceptable.

Q: What are the key differences between the two substitute parts?

A: AT25XE041B-SSHNHR-T operates at 85 MHz with extended temperature range to 125°C and superior moisture sensitivity (MSL 1). LE25U40CMC-AH operates at 40 MHz with temperature range limited to 85°C and standard moisture sensitivity (MSL 3). Both maintain the 2.3V ~ 3.6V voltage range and 5ms write cycle time of the original part.

Q: Are package footprints identical between all three parts?

A: All three parts use 8-SOIC packaging with 0.154" (3.90mm) width. Physical footprint compatibility is confirmed for PCB layout purposes.

Q: Which substitute is recommended for high-temperature applications?

A: AT25XE041B-SSHNHR-T supports operation to 125°C, exceeding the original part's 105°C specification. LE25U40CMC-AH is limited to 85°C and is not suitable for applications requiring temperatures above 85°C.

Q: Are both substitutes available in production quantities?

A: Both substitutes have active product status. AT25XE041B-SSHNHR-T has 806 pcs in stock. LE25U40CMC-AH has 24,546 pcs in stock, providing greater immediate availability.

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