JS28F512M29EWHB TR - Equivalent & Substitute Parts

Part Overview

The JS28F512M29EWHB TR is a 512Mbit parallel NOR Flash memory IC manufactured by Micron Technology Inc., packaged in a 56-TFSOP surface mount configuration. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and production continuity. The part operates across industrial temperature ranges (-40°C to 85°C) and is suitable for applications requiring non-volatile parallel memory storage with 110 ns access time performance.

Key Parameters

Parameter	Value
Memory Size	512Mbit
Memory Format	FLASH - NOR
Memory Organization	64M x 8, 32M 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 JS28F512M29EWHB TR is determined by strict alignment across the following critical parameters:

Memory capacity and organization must remain constant at 512Mbit with 64M x 8 or 32M x 16 configurations to ensure address and data bus compatibility. The parallel interface requirement is non-negotiable for direct pin-level compatibility. Package type must be identical (56-TFSOP) to maintain PCB footprint and mounting compatibility. Supply voltage range (2.7V ~ 3.6V) and operating temperature range (-40°C ~ 85°C) must be met or exceeded. RoHS3 compliance and MSL rating of 3 are required for regulatory and manufacturing process alignment.

The MT28EW512ABA1HJS-0SIT TR qualifies as a direct substitute based on these parameters. While this part demonstrates improved performance characteristics (95 ns access time versus 110 ns, and 60 ns write cycle time versus 110 ns), these enhancements do not compromise backward compatibility. The substitute maintains identical memory capacity, organization, interface type, package configuration, voltage specifications, temperature range, and compliance certifications.

Parameter Comparison

Parameter	JS28F512M29EWHB TR	MT28EW512ABA1HJS-0SIT TR	Compatibility
Memory Size	512Mbit	512Mbit	Identical
Memory Format	FLASH - NOR	FLASH - NOR	Identical
Memory Organization	64M x 8, 32M x 16	64M x 8, 32M x 16	Identical
Memory Interface	Parallel	Parallel	Identical
Access Time	110 ns	95 ns	Compatible (Improved)
Write Cycle Time	110 ns	60 ns	Compatible (Improved)
Voltage Supply	2.7V ~ 3.6V	2.7V ~ 3.6V	Identical
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical
Package Type	56-TFSOP (0.724", 18.40mm Width)	56-TFSOP (0.724", 18.40mm Width)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
MSL Rating	3 (168 Hours)	3 (168 Hours)	Identical
Product Status	Obsolete	Active	Substitute is Active

Engineering Selection Recommendations

The MT28EW512ABA1HJS-0SIT TR is a qualified substitute for the obsolete JS28F512M29EWHB TR. Both components are manufactured by Micron Technology Inc. and maintain identical electrical and mechanical specifications across all critical parameters. The substitute part carries Active product status, ensuring continued availability and manufacturing support, whereas the original part is classified as Obsolete.

Both parts maintain ROHS3 compliance and identical MSL ratings, satisfying regulatory and manufacturing process requirements. The substitute demonstrates superior performance characteristics with reduced access time (95 ns versus 110 ns) and write cycle time (60 ns versus 110 ns), providing operational headroom without introducing compatibility concerns.

Selection of the MT28EW512ABA1HJS-0SIT TR is appropriate for new designs, production continuity, and field replacements where the original part is no longer available.

Frequently Asked Questions (FAQ)

Q: Can the MT28EW512ABA1HJS-0SIT TR be used as a direct replacement for the JS28F512M29EWHB TR?

A: Yes. Both parts share identical memory capacity (512Mbit), organization (64M x 8, 32M x 16), parallel interface, package type (56-TFSOP), voltage supply range (2.7V ~ 3.6V), and operating temperature range (-40°C ~ 85°C). Pin-level compatibility is maintained, allowing direct PCB substitution.

Q: What are the performance differences between these parts?

A: The substitute part (MT28EW512ABA1HJS-0SIT TR) offers improved performance with 95 ns access time compared to 110 ns, and 60 ns write cycle time compared to 110 ns. These enhancements do not affect backward compatibility and provide operational margin for timing-sensitive applications.

Q: Are there packaging differences between the two parts?

A: No. Both parts use identical 56-TFSOP surface mount packaging with 0.724" width (18.40mm). PCB footprints and mounting procedures are identical.

Q: Why is the original part classified as Obsolete?

A: The JS28F512M29EWHB TR is no longer in active production. The MT28EW512ABA1HJS-0SIT TR represents the current active equivalent from Micron Technology Inc., ensuring long-term availability and manufacturing support.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant and carry identical MSL ratings of 3 (168 Hours), satisfying regulatory and manufacturing process requirements.

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