JS28F128J3F75A Equivalent & Substitute Parts

Part Overview

The JS28F128J3F75A is a 128Mbit parallel NOR Flash memory IC manufactured by Micron Technology Inc., packaged in a 56-TFSOP surface mount configuration. This component operates at 2.7V to 3.6V with a 75 ns access time and is classified as obsolete. Due to its discontinued status, identifying compatible substitute parts is essential for system redesign, legacy product support, and procurement continuity.

Substiute Parts

JS28F128J3F75A

Micron Technology Inc.In Stock: 150237JS28F128J3F75A Datasheet

Current PartRFQ

MT28EW128ABA1HJS-0SIT

Micron Technology Inc.In Stock: 18088MT28EW128ABA1HJS-0SIT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the JS28F128J3F75A is determined by the following critical parameters:

Memory Capacity & Organization: The substitute must provide 128Mbit capacity with 16M x 8 or 8M x 16 organization to maintain functional equivalence.

Interface Type: Parallel interface is mandatory for direct pin-level compatibility.

Package & Pinout: The 56-TFSOP package with identical physical dimensions (0.724", 18.40mm Width) ensures mechanical and electrical compatibility on existing PCBs.

Voltage Compatibility: Supply voltage range of 2.7V to 3.6V must be maintained.

Operating Temperature Range: The -40°C to 85°C specification must be met or exceeded.

Access Time: The substitute's access time must not exceed the original specification to ensure timing compatibility in the application circuit.

The MT28EW128ABA1HJS-0SIT meets all these criteria and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The MT28EW128ABA1HJS-0SIT is a qualified substitute for the JS28F128J3F75A based on the following factors:

Compliance & Certification: Both parts maintain ROHS3 compliance and identical MSL ratings, ensuring regulatory and manufacturing process compatibility.

Product Availability: The substitute is in active production status with 18,005 units in stock, providing supply chain continuity compared to the obsolete main part.

Electrical Compatibility: Identical voltage supply range (2.7V ~ 3.6V) and operating temperature range (-40°C ~ 85°C) ensure direct functional replacement in existing circuit designs.

Timing Characteristics: The substitute's 95 ns access time exceeds the original 75 ns specification. Applications with timing-critical read operations must validate that the additional 20 ns delay does not impact system performance. The write cycle time of 60 ns is faster than the original 75 ns, providing improved write performance.

Physical Compatibility: Identical 56-TFSOP package dimensions enable direct PCB placement without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the MT28EW128ABA1HJS-0SIT be used as a direct drop-in replacement for the JS28F128J3F75A?

A: Yes, for most applications. Both parts share identical memory capacity, organization, interface type, package, voltage supply range, and operating temperature range. However, the substitute has a 95 ns access time versus the original 75 ns. Applications with timing-critical read operations must verify that the additional 20 ns latency does not violate system timing requirements.

Q: Are there any packaging differences between these parts?

A: No. Both parts use the 56-TFSOP package with identical physical dimensions (0.724", 18.40mm Width) and surface mount configuration. No PCB layout modifications are required.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the JS28F128J3F75A and MT28EW128ABA1HJS-0SIT are ROHS3 compliant with identical MSL ratings of 3 (168 Hours), ensuring equivalent handling and storage requirements.

Q: What is the primary difference between these two parts?

A: The main difference is product status and timing specifications. The JS28F128J3F75A is obsolete with a 75 ns access time, while the MT28EW128ABA1HJS-0SIT is in active production with a 95 ns access time. The substitute also features a faster write cycle time of 60 ns compared to 75 ns.

Q: Is the slower access time of the substitute a concern?

A: The 20 ns difference in access time must be evaluated against your specific application requirements. If your system timing budget accommodates the additional latency, the substitute is fully compatible. If read timing is critical, conduct timing analysis to confirm compatibility.

Q: What is the availability status of each part?

A: The JS28F128J3F75A is obsolete with 150,220 units in stock. The MT28EW128ABA1HJS-0SIT is in active production with 18,005 units available, making it the recommended choice for new designs and ongoing procurement.