JS28F256J3F105A Equivalent & Substitute Parts

Part Overview

The JS28F256J3F105A is a 256Mbit parallel NOR Flash memory IC manufactured by Micron Technology Inc., packaged in a 56-TSOP form factor. This component operates at 2.7V to 3.6V supply voltage with an access time of 105 ns and is designed for non-volatile memory applications requiring parallel interface connectivity. The part is classified as obsolete, making identification of compatible substitutes essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Memory Size	256Mbit
Memory Organization	32M x 8, 16M x 16
Memory Interface	Parallel
Access Time	105 ns
Write Cycle Time	105 ns
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	56-TFSOP (0.724", 18.40mm Width)
Technology	FLASH - NOR
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the JS28F256J3F105A is determined by the following critical parameters:

Memory capacity and organization must remain constant at 256Mbit with 32M x 8 or 16M x 16 configuration to ensure data storage compatibility. The parallel interface requirement is non-negotiable for circuit board integration. Package type must match the 56-TFSOP footprint to maintain mechanical compatibility with existing PCB layouts. Supply voltage range of 2.7V to 3.6V must be supported. Operating temperature range of -40°C to 85°C must be maintained. RoHS3 compliance is required for regulatory alignment.

The MT28EW256ABA1HJS-0SIT qualifies as a substitute based on matching memory capacity, organization, parallel interface, package type, voltage range, temperature range, and RoHS3 compliance. Access time and write cycle time improvements represent performance enhancements rather than compatibility barriers.

Parameter Comparison

Parameter	JS28F256J3F105A	MT28EW256ABA1HJS-0SIT
Manufacturer	Micron Technology Inc.	Micron Technology Inc.
Memory Size	256Mbit	256Mbit
Memory Organization	32M x 8, 16M x 16	32M x 8, 16M x 16
Memory Interface	Parallel	Parallel
Access Time	105 ns	75 ns
Write Cycle Time	105 ns	60 ns
Voltage Supply Range	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	56-TFSOP	56-TFSOP
Technology	FLASH - NOR	FLASH - NOR
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active

Engineering Selection Recommendations

The MT28EW256ABA1HJS-0SIT is a direct substitute for the JS28F256J3F105A. Both components are manufactured by Micron Technology Inc. and share identical memory capacity, organization, interface type, package footprint, voltage specifications, and temperature range. Both maintain ROHS3 compliance.

The primary distinction is product status: the original part is obsolete while the substitute is active. The substitute offers improved performance characteristics with faster access time (75 ns versus 105 ns) and faster write cycle time (60 ns versus 105 ns), representing performance enhancements that do not compromise backward compatibility.

Selection of the MT28EW256ABA1HJS-0SIT is appropriate for new designs and replacement applications where component availability is a consideration.

Frequently Asked Questions (FAQ)

Q: Can the MT28EW256ABA1HJS-0SIT be used as a direct replacement for the JS28F256J3F105A?

A: Yes. Both components share identical memory capacity (256Mbit), organization (32M x 8, 16M x 16), parallel interface, 56-TFSOP package footprint, voltage range (2.7V to 3.6V), and operating temperature range (-40°C to 85°C). The substitute is pin-compatible and functionally equivalent.

Q: What are the performance differences between these parts?

A: The MT28EW256ABA1HJS-0SIT provides faster access time (75 ns versus 105 ns) and faster write cycle time (60 ns versus 105 ns). These improvements represent performance enhancements and do not affect compatibility with existing circuit designs.

Q: Are both parts RoHS compliant?

A: Yes. Both the JS28F256J3F105A and MT28EW256ABA1HJS-0SIT are ROHS3 compliant.

Q: Why is the original part listed as obsolete?

A: The JS28F256J3F105A is classified as obsolete by the manufacturer, indicating it is no longer in active production. The MT28EW256ABA1HJS-0SIT remains in active production status.

Q: Are there any package or footprint differences?

A: No. Both components use the 56-TFSOP package with identical dimensions (0.724", 18.40mm width), ensuring mechanical compatibility with existing PCB layouts.

Q: What is the moisture sensitivity level difference?

A: The JS28F256J3F105A has MSL 1 (unlimited), while the MT28EW256ABA1HJS-0SIT has MSL 3 (168 hours). This affects storage and handling requirements but does not impact functional compatibility.

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