JS28F512P33EFA Equivalent & Substitute Parts

Part Overview

The JS28F512P33EFA is a 512Mbit parallel NOR Flash memory IC manufactured by Micron Technology Inc., packaged in a 56-TSOP surface mount configuration. This component operates across a supply voltage range of 2.3V to 3.6V with an access time of 105 ns and a write cycle time of 105 ns. The part is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Memory Size	512Mbit
Memory Organization	32M x 16
Memory Interface	Parallel
Technology	FLASH - NOR
Access Time	105 ns
Write Cycle Time	105 ns
Voltage Supply Range	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	56-TFSOP
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the JS28F512P33EFA is determined by strict alignment of the following critical parameters:

Memory capacity and organization must remain constant at 512Mbit with 32M x 16 organization to ensure address bus and data bus compatibility. The parallel interface requirement is non-negotiable for direct pin-level compatibility. Package type must be 56-TFSOP to maintain PCB footprint compatibility. Operating temperature range must encompass or match the original specification of -40°C to 85°C. Supply voltage range must be compatible; the substitute may have a higher minimum voltage (2.7V vs 2.3V) provided system design accommodates this constraint. Access time and write cycle time specifications may be equal or faster without functional impact. RoHS3 compliance and MSL rating must be maintained for manufacturing and environmental requirements.

Parameter Comparison

Parameter	JS28F512P33EFA	MT28EW512ABA1HJS-0SIT	Compatibility
Memory Size	512Mbit	512Mbit	Match
Memory Organization	32M x 16	64M x 8, 32M x 16	Compatible
Memory Interface	Parallel	Parallel	Match
Technology	FLASH - NOR	FLASH - NOR	Match
Access Time	105 ns	95 ns	Faster (Compatible)
Write Cycle Time	105 ns	60 ns	Faster (Compatible)
Voltage Supply Range	2.3V ~ 3.6V	2.7V ~ 3.6V	Overlapping Range
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Match
Package Type	56-TFSOP	56-TFSOP	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
MSL Rating	3 (168 Hours)	3 (168 Hours)	Match

Engineering Selection Recommendations

The MT28EW512ABA1HJS-0SIT serves as a direct substitute for the obsolete JS28F512P33EFA based on matching memory capacity, organization, interface type, package configuration, and environmental specifications. The substitute component exhibits improved performance characteristics with faster access time (95 ns vs 105 ns) and faster write cycle time (60 ns vs 105 ns), providing performance headroom without requiring design modifications.

The substitute part carries active product status with higher inventory availability (18,412 pcs vs 7,673 pcs), ensuring long-term supply continuity. Both components maintain ROHS3 compliance and identical MSL ratings, satisfying manufacturing and environmental requirements. The voltage supply range of the substitute (2.7V ~ 3.6V) is compatible with the original specification range, provided system design operates at or above 2.7V.

Frequently Asked Questions (FAQ)

Q: Can MT28EW512ABA1HJS-0SIT directly replace JS28F512P33EFA without PCB modifications?

A: Yes. Both components share identical 56-TFSOP package dimensions and pin configurations. No PCB layout changes are required for physical substitution.

Q: What is the significance of the memory organization difference (32M x 16 vs 64M x 8, 32M x 16)?

A: The MT28EW512ABA1HJS-0SIT supports multiple organization modes including 32M x 16, which matches the original part's organization. This flexibility ensures full compatibility with existing address and data bus configurations.

Q: Does the faster access time of the substitute part create any compatibility issues?

A: No. Faster access time is a performance improvement that does not introduce compatibility issues. Systems designed for 105 ns access time operate correctly with 95 ns components.

Q: What is the impact of the higher minimum supply voltage (2.7V vs 2.3V)?

A: Systems operating at supply voltages between 2.3V and 2.7V require evaluation. If the original design operates above 2.7V, the substitute is fully compatible. If operation below 2.7V is required, the substitute is not suitable.

Q: Are both parts RoHS compliant?

A: Yes. Both JS28F512P33EFA and MT28EW512ABA1HJS-0SIT are ROHS3 compliant, meeting environmental and regulatory requirements.

Q: What does MSL 3 (168 Hours) mean for component handling?

A: MSL 3 indicates the component can remain at room temperature and humidity for up to 168 hours after moisture exposure before soldering. Both parts share this rating, requiring identical handling procedures.

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