JS28F256M29EWHD Equivalent & Substitute Parts

Part Overview

The JS28F256M29EWHD is a 256Mbit parallel NOR Flash memory IC manufactured by Micron Technology Inc., packaged in 56-TFSOP with 110 ns access time. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part operates across a wide temperature range (-40°C to 85°C) and complies with RoHS3 and REACH standards.

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 / Case	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 JS28F256M29EWHD is determined by the following critical parameters:

Memory capacity: 256Mbit
Memory technology: FLASH - NOR
Memory organization: 32M x 8 or 16M x 16
Interface type: Parallel
Package: 56-TFSOP
Voltage supply range: 2.7V ~ 3.6V
Operating temperature range: -40°C ~ 85°C
RoHS3 compliance
MSL rating: 3 (168 Hours)

Substitute parts are grouped into two categories: direct substitutes with improved performance characteristics and similar substitutes with equivalent or matching performance specifications.

Parameter Comparison

Parameter	JS28F256M29EWHD	MT28EW256ABA1HJS-0SIT	MX29GL256FDT2I-11G	MX29GL256FHT2I-90Q	MX29GL256FUT2I-11G
Manufacturer	Micron Technology Inc.	Micron Technology Inc.	Macronix	Macronix	Macronix
Memory Size	256Mbit	256Mbit	256Mbit	256Mbit	256Mbit
Memory Format	FLASH - NOR	FLASH - NOR	FLASH - NOR	FLASH - NOR	FLASH - NOR
Memory Organization	32M x 8, 16M x 16	32M x 8, 16M x 16	32M x 8	32M x 8	32M x 8
Memory Interface	Parallel	Parallel	Parallel	Parallel	Parallel
Access Time	110 ns	75 ns	110 ns	90 ns	110 ns
Write Cycle Time	110 ns	60 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	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	56-TFSOP	56-TFSOP	56-TFSOP	56-TFSOP	56-TFSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

All substitute parts listed maintain full compatibility with the JS28F256M29EWHD across critical electrical and mechanical parameters. Selection should be based on product availability and active manufacturing status.

MT28EW256ABA1HJS-0SIT is a direct Micron Technology substitute with improved access time (75 ns) and write cycle time (60 ns) compared to the original part. This part carries active product status with 19,037 units in stock.

MX29GL256FHT2I-90Q is a Macronix alternative with 90 ns access and write cycle times, positioned between the original specification and the faster Micron substitute. This part has the highest inventory availability at 40,200 units.

MX29GL256FDT2I-11G and MX29GL256FUT2I-11G are Macronix alternatives matching the original 110 ns timing specification. Both parts maintain active product status with RoHS3 compliance and MSL rating 3.

All substitute parts are RoHS3 compliant and carry identical ECCN and HTSUS classifications, ensuring regulatory and trade compliance equivalence.

Frequently Asked Questions (FAQ)

Q: Can MT28EW256ABA1HJS-0SIT replace JS28F256M29EWHD in existing designs?

A: Yes. MT28EW256ABA1HJS-0SIT is electrically and mechanically compatible. The improved access time (75 ns vs. 110 ns) and write cycle time (60 ns vs. 110 ns) provide performance enhancement without requiring design modification. Both parts operate at 2.7V to 3.6V, support identical memory organization, and use the same 56-TFSOP package.

Q: What is the difference between Micron and Macronix substitutes?

A: Both manufacturers provide 256Mbit parallel NOR Flash in 56-TFSOP packaging with identical voltage and temperature specifications. Micron's MT28EW256ABA1HJS-0SIT offers faster access times. Macronix parts (MX29GL256 series) provide timing options ranging from 90 ns to 110 ns. All parts are RoHS3 compliant with MSL rating 3.

Q: Are all substitute parts in active production?

A: Yes. MT28EW256ABA1HJS-0SIT, MX29GL256FDT2I-11G, MX29GL256FHT2I-90Q, and MX29GL256FUT2I-11G all carry active product status. The original JS28F256M29EWHD is obsolete, making these substitutes necessary for ongoing supply.

Q: Do substitute parts require PCB layout changes?

A: No. All substitute parts use the identical 56-TFSOP package with 0.724" width and 18.40mm dimensions. PCB footprints and mounting requirements remain unchanged.

Q: Which substitute offers the best availability?

A: MX29GL256FHT2I-90Q has the highest inventory at 40,200 units in stock, followed by MT28EW256ABA1HJS-0SIT with 19,037 units.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message