JS28F256P33BFE Equivalent & Substitute Parts

Part Overview

The JS28F256P33BFE is a 256Mbit 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 substitutes essential for ongoing system support and component procurement.

The obsolete status of the JS28F256P33BFE necessitates sourcing equivalent alternatives that maintain functional compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value
Memory Size	256Mbit
Memory Format	FLASH - NOR
Memory Organization	16M x 16
Memory Interface	Parallel
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
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the JS28F256P33BFE is determined by the following critical parameters:

Memory Capacity & Organization: 256Mbit total capacity with compatible organization (16M x 16 or 32M x 8)
Technology & Interface: FLASH - NOR parallel interface
Package & Pinout: 56-TFSOP surface mount package with matching physical dimensions (0.724", 18.40mm width)
Voltage Compatibility: Supply voltage range must encompass or overlap with the original specification
Access & Write Timing: Substitute parts must meet or exceed performance specifications
Compliance Standards: RoHS3 compliance and equivalent environmental certifications

The MT28EW256ABA1LJS-0SIT qualifies as a direct substitute based on matching memory capacity, technology, package configuration, and compliance requirements. This part is manufactured by the same supplier (Micron Technology Inc.) and maintains functional equivalence within the specified electrical and mechanical parameters.

Parameter Comparison

Parameter	JS28F256P33BFE	MT28EW256ABA1LJS-0SIT	Compatibility
Memory Size	256Mbit	256Mbit	Match
Memory Format	FLASH - NOR	FLASH - NOR	Match
Memory Organization	16M x 16	32M x 8, 16M x 16	Compatible
Memory Interface	Parallel	Parallel	Match
Access Time	105 ns	75 ns	Substitute Faster
Write Cycle Time	105 ns	60 ns	Substitute Faster
Voltage Supply Range	2.3V ~ 3.6V	2.7V ~ 3.6V	Overlapping
Operating Temperature	-40°C ~ 85°C (TC)	-40°C ~ 85°C (TA)	Match
Package Type	56-TFSOP	56-TFSOP	Match
Mounting Type	Surface Mount	Surface Mount	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match

Engineering Selection Recommendations

The MT28EW256ABA1LJS-0SIT is a qualified substitute for the obsolete JS28F256P33BFE based on the following factors:

Functional Equivalence: Both parts share identical memory capacity (256Mbit), technology (FLASH - NOR), and parallel interface architecture
Package Compatibility: Identical 56-TFSOP package with matching physical dimensions ensures PCB-level compatibility without layout modifications
Performance Enhancement: The substitute part delivers improved access time (75 ns vs. 105 ns) and write cycle time (60 ns vs. 105 ns), providing performance headroom for existing designs
Compliance Alignment: Both parts maintain ROHS3 compliance and equivalent environmental certifications (REACH Unaffected, identical ECCN and HTSUS classifications)
Active Product Status: The MT28EW256ABA1LJS-0SIT maintains active manufacturing status, ensuring long-term availability and supply chain stability

The overlapping voltage supply range (2.7V ~ 3.6V for the substitute vs. 2.3V ~ 3.6V for the original) is acceptable for applications operating within the 2.7V to 3.6V window. Applications requiring operation below 2.7V require design review.

Frequently Asked Questions (FAQ)

Q: Can the MT28EW256ABA1LJS-0SIT be used as a direct replacement without PCB modifications?

A: Yes. Both parts use the 56-TFSOP package with identical pinout and physical dimensions (0.724", 18.40mm width). No PCB layout changes are required for mechanical or electrical compatibility.

Q: What is the impact of the faster access time on system compatibility?

A: The substitute part's 75 ns access time is faster than the original 105 ns specification. This improvement is backward compatible with designs expecting the original timing. No timing violations will occur in existing circuits.

Q: Are there voltage supply considerations when substituting?

A: The substitute part operates across 2.7V to 3.6V, compared to the original 2.3V to 3.6V range. Applications operating at 2.3V to 2.7V require verification that system voltage remains within the substitute's specification. Most 3.3V systems operate comfortably within both ranges.

Q: Do both parts share the same compliance certifications?

A: Yes. Both the JS28F256P33BFE and MT28EW256ABA1LJS-0SIT are ROHS3 compliant, REACH unaffected, and share identical ECCN (3A991B1A) and HTSUS (8542.32.0071) classifications.

Q: What is the difference between memory organization options?

A: The substitute supports both 32M x 8 and 16M x 16 organization modes. The original part operates in 16M x 16 mode. The substitute's 16M x 16 mode provides functional equivalence for existing firmware and software implementations.

Q: Is the substitute part currently available?

A: Yes. The MT28EW256ABA1LJS-0SIT maintains active product status with 2044 units in current inventory, ensuring immediate availability for procurement and production deployment.

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