JS28F512M29EWHA Equivalent & Substitute Parts

Part Overview

The JS28F512M29EWHA is a 512Mbit parallel NOR Flash memory IC manufactured by Micron Technology Inc., packaged in a 56-TFSOP surface mount configuration. This component operates across a supply voltage range of 2.7V to 3.6V with an access time of 110 ns and is compliant with RoHS3 and REACH standards. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, maintenance, and component procurement.

Key Parameters

Parameter	Value
Memory Size	512Mbit
Memory Format	FLASH
Technology	FLASH - NOR
Memory Organization	64M x 8, 32M x 16
Memory Interface	Parallel
Access Time	110 ns
Write Cycle Time - Word, Page	110 ns
Voltage - Supply	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	56-TFSOP (0.724", 18.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the JS28F512M29EWHA is determined by strict equivalence across the following critical parameters:

Memory capacity: 512Mbit
Memory technology: FLASH - NOR
Memory organization: 64M x 8, 32M x 16
Memory interface: Parallel
Supply voltage range: 2.7V ~ 3.6V
Operating temperature range: -40°C ~ 85°C (TA)
Package type: 56-TFSOP surface mount
Mechanical dimensions: 0.724" × 18.40mm width
Regulatory compliance: RoHS3 and REACH

The MT28EW512ABA1HJS-0SIT meets all substitution criteria. While this part exhibits improved access time (95 ns versus 110 ns) and write cycle time (60 ns versus 110 ns), these represent performance enhancements rather than deviations from the electrical and mechanical interface requirements. Both components share identical memory capacity, organization, interface topology, voltage specifications, temperature range, and physical packaging.

Parameter Comparison

Parameter	JS28F512M29EWHA	MT28EW512ABA1HJS-0SIT
Manufacturer	Micron Technology Inc.	Micron Technology Inc.
Memory Size	512Mbit	512Mbit
Memory Format	FLASH	FLASH
Technology	FLASH - NOR	FLASH - NOR
Memory Organization	64M x 8, 32M x 16	64M x 8, 32M x 16
Memory Interface	Parallel	Parallel
Access Time	110 ns	95 ns
Write Cycle Time - Word, Page	110 ns	60 ns
Voltage - Supply	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	56-TFSOP (0.724", 18.40mm Width)	56-TFSOP (0.724", 18.40mm Width)
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The MT28EW512ABA1HJS-0SIT is a direct functional substitute for the JS28F512M29EWHA. Both components are manufactured by Micron Technology Inc. and maintain identical electrical interfaces, memory specifications, and physical packaging. The substitute part is currently in active production status, whereas the original part is obsolete.

Selection of the MT28EW512ABA1HJS-0SIT provides the additional benefit of improved performance characteristics, with faster access time and write cycle time. Both parts maintain full RoHS3 and REACH compliance, ensuring regulatory alignment for new designs and legacy system support.

Frequently Asked Questions (FAQ)

Q: Can the MT28EW512ABA1HJS-0SIT be used as a direct replacement for the JS28F512M29EWHA in existing designs?

A: Yes. Both components share identical memory capacity (512Mbit), memory organization (64M x 8, 32M x 16), parallel interface topology, supply voltage range (2.7V ~ 3.6V), operating temperature range (-40°C ~ 85°C), and 56-TFSOP package dimensions. The substitute part is pin-compatible and electrically compatible.

Q: What are the performance differences between these two parts?

A: The MT28EW512ABA1HJS-0SIT offers improved timing specifications. Access time is reduced from 110 ns to 95 ns, and write cycle time is reduced from 110 ns to 60 ns. These represent performance enhancements that do not affect interface compatibility.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the JS28F512M29EWHA and MT28EW512ABA1HJS-0SIT are RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Q: What is the significance of the product status difference?

A: The JS28F512M29EWHA is classified as obsolete, indicating it is no longer in production. The MT28EW512ABA1HJS-0SIT is in active production status, ensuring ongoing availability for procurement and support.

Q: Are the moisture sensitivity levels identical?

A: Yes. Both components have a Moisture Sensitivity Level (MSL) rating of 3 with a 168-hour floor life specification, requiring identical handling and storage protocols.

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