IS25WD040-JNLE Equivalent & Substitute Parts

Part Overview

The IS25WD040-JNLE is a 4Mbit NOR Flash memory IC manufactured by ISSI (Integrated Silicon Solution Inc) with SPI interface operating at 80 MHz. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part is housed in an 8-SOIC package and operates across an extended temperature range of -40°C to 105°C with supply voltage of 1.65V to 1.95V.

Key Parameters

Parameter	Value
Memory Size	4Mbit
Memory Organization	512K x 8
Memory Interface	SPI
Clock Frequency	80 MHz
Write Cycle Time	3ms
Voltage Supply Range	1.65V ~ 1.95V
Operating Temperature	-40°C ~ 105°C
Package Type	8-SOIC
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the IS25WD040-JNLE is determined by the following critical parameters: memory capacity (4Mbit), memory organization (512K x 8), SPI interface compatibility, supply voltage range (1.65V ~ 1.95V), and 8-SOIC package format. Clock frequency and write cycle time are secondary considerations that may vary within acceptable operational limits depending on system requirements.

The substitute parts identified maintain core electrical compatibility while offering different performance characteristics and product status classifications. All substitutes are NOR Flash memory devices with identical memory capacity and organization, ensuring functional interchangeability at the memory interface level.

Parameter Comparison

Parameter	IS25WD040-JNLE	IS25WQ040-JNLE	SST25WF040B-40I/SN	SST25WF040BT-40I/SN
Manufacturer	ISSI	ISSI	Microchip Technology	Microchip Technology
Memory Size	4Mbit	4Mbit	4Mbit	4Mbit
Memory Organization	512K x 8	512K x 8	512K x 8	512K x 8
Memory Interface	SPI	SPI	SPI	SPI
Clock Frequency	80 MHz	104 MHz	40 MHz	40 MHz
Write Cycle Time	3ms	1ms	1ms	1ms
Voltage Supply	1.65V ~ 1.95V	1.65V ~ 1.95V	1.65V ~ 1.95V	1.65V ~ 1.95V
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

IS25WQ040-JNLE is the manufacturer-recommended primary substitute, maintaining ISSI product lineage with active product status. This part offers improved performance with 104 MHz clock frequency and 1ms write cycle time while preserving the extended operating temperature range (-40°C to 105°C) of the original part. The package width differs (5.30mm vs 3.90mm), requiring PCB layout verification.

SST25WF040B-40I/SN and SST25WF040BT-40I/SN are Microchip Technology alternatives with active product status and superior moisture sensitivity ratings (MSL 1 vs MSL 3). These parts operate at reduced clock frequency (40 MHz) and narrower temperature range (-40°C to 85°C). The SST25WF040B-40I/SN is supplied in tube packaging, while SST25WF040BT-40I/SN is supplied in tape and reel format. Both maintain the original 8-SOIC package dimensions (0.154", 3.90mm width).

Selection between substitutes depends on system performance requirements, thermal operating conditions, and supply chain availability. All substitutes maintain electrical compatibility at the SPI interface level with identical memory capacity and organization.

Frequently Asked Questions (FAQ)

Q: Can IS25WQ040-JNLE directly replace IS25WD040-JNLE on existing PCBs?

A: Electrical compatibility is maintained. However, the package width differs (5.30mm vs 3.90mm), requiring PCB layout verification before implementation. Pin configuration and SPI interface timing are compatible.

Q: What are the performance differences between the substitute parts?

A: IS25WQ040-JNLE operates at 104 MHz with 1ms write cycle time. SST25WF040B-40I/SN and SST25WF040BT-40I/SN operate at 40 MHz with 1ms write cycle time. The original IS25WD040-JNLE operates at 80 MHz with 3ms write cycle time. Clock frequency selection depends on system timing requirements.

Q: Are there temperature range limitations with Microchip substitutes?

A: SST25WF040B-40I/SN and SST25WF040BT-40I/SN operate to 85°C maximum, compared to 105°C for ISSI parts. Applications requiring extended temperature operation above 85°C must use IS25WQ040-JNLE.

Q: What is the difference between SST25WF040B-40I/SN and SST25WF040BT-40I/SN?

A: Both parts are electrically identical. The primary difference is packaging format: SST25WF040B-40I/SN is supplied in tube, while SST25WF040BT-40I/SN is supplied in tape and reel. Selection depends on assembly process requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All parts listed are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements.

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