JS28F256M29EWLD Equivalent & Substitute Parts

Part Overview

The JS28F256M29EWLD is a 256Mbit NOR Flash memory IC manufactured by Micron Technology Inc., packaged in 56-TSOP with parallel interface architecture. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations. The part operates across industrial temperature ranges (-40°C to 85°C) and complies with ROHS3 standards, serving applications requiring non-volatile parallel flash memory with 110ns access time.

Key Parameters

Parameter	Value
Memory Size	256Mbit
Memory Format	FLASH - NOR
Memory Organization	32M x 8, 16M x 16
Memory Interface	Parallel
Access Time	110 ns
Write Cycle Time	110 ns
Voltage Supply	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	56-TFSOP (0.724", 18.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the JS28F256M29EWLD is determined by strict alignment across the following parameters:

Memory capacity: 256Mbit
Technology: FLASH - NOR
Memory organization: 32M x 8 minimum
Interface: Parallel
Package: 56-TFSOP
Voltage supply range: 2.7V ~ 3.6V
Operating temperature: -40°C ~ 85°C
RoHS compliance: ROHS3
MSL rating: 3 (168 Hours)

The three qualified substitute parts (MX29GL256FDT2I-11G, MX29GL256FHT2I-90Q, MX29GL256FUT2I-11G) from Macronix meet all mandatory electrical and mechanical parameters. Access time variations (90ns vs 110ns) represent performance enhancements rather than compatibility constraints, as faster access times are backward compatible with systems designed for 110ns operation.

Parameter Comparison

Parameter	JS28F256M29EWLD	MX29GL256FDT2I-11G	MX29GL256FHT2I-90Q	MX29GL256FUT2I-11G
Manufacturer	Micron Technology Inc.	Macronix	Macronix	Macronix
Memory Size	256Mbit	256Mbit	256Mbit	256Mbit
Memory Format	FLASH - NOR	FLASH - NOR	FLASH - NOR	FLASH - NOR
Memory Organization	32M x 8, 16M x 16	32M x 8	32M x 8	32M x 8
Memory Interface	Parallel	Parallel	Parallel	Parallel
Access Time	110 ns	110 ns	90 ns	110 ns
Write Cycle Time	110 ns	110 ns	90 ns	110 ns
Voltage Supply	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	56-TFSOP	56-TFSOP	56-TFSOP	56-TFSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

All three Macronix substitute parts maintain active product status, ensuring long-term availability and supply chain continuity compared to the obsolete JS28F256M29EWLD. Each substitute carries ROHS3 compliance and identical MSL ratings, meeting regulatory and environmental requirements.

MX29GL256FHT2I-90Q provides performance enhancement with 90ns access and write cycle times, suitable for applications where faster memory operation improves system throughput. MX29GL256FDT2I-11G and MX29GL256FUT2I-11G maintain 110ns timing specifications, matching the original part's performance envelope for direct replacement scenarios.

Selection between these three parts should be based on inventory availability, packaging requirements (tray vs. standard), and performance headroom needed for the target application. All three parts satisfy the electrical and mechanical compatibility requirements for the JS28F256M29EWLD footprint and pinout.

Frequently Asked Questions (FAQ)

Q: Can MX29GL256FHT2I-90Q (90ns) replace JS28F256M29EWLD (110ns) in existing designs?

A: Yes. The 90ns access time is faster than the original 110ns specification, making it backward compatible. Systems designed for 110ns operation function correctly with faster memory components.

Q: Are all substitute parts pin-compatible with the original JS28F256M29EWLD?

A: Yes. All three Macronix substitutes use the 56-TFSOP package with identical pinout and electrical interface specifications (parallel, 2.7V-3.6V supply, same memory organization).

Q: What is the difference between MX29GL256FDT2I-11G and MX29GL256FUT2I-11G?

A: Both parts share identical electrical specifications (256Mbit, 110ns, parallel interface, 56-TFSOP). The difference lies in packaging format and inventory availability. Consult supplier documentation for specific packaging distinctions.

Q: Do all substitute parts meet the same compliance standards as the original?

A: Yes. All three Macronix parts are ROHS3 compliant with MSL rating 3 (168 Hours), matching the JS28F256M29EWLD compliance profile.

Q: Why is the original JS28F256M29EWLD marked as obsolete?

A: Micron Technology has discontinued this product line. Active alternatives from Macronix provide equivalent functionality with ongoing manufacturer support and supply availability.

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