JS28F064M29EWLA Equivalent & Substitute Parts

Part Overview

The JS28F064M29EWLA is a 64Mbit parallel NOR Flash memory IC manufactured by Micron Technology Inc., housed in a 56-TSOP package. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement. The part operates across a wide temperature range (-40°C to 85°C) and is suitable for applications requiring non-volatile parallel memory storage with 70 ns access time.

Substiute Parts

JS28F064M29EWLA

Micron Technology Inc.In Stock: 1359JS28F064M29EWLA Datasheet

Current PartRFQ

MT28EW128ABA1LJS-0SIT

Micron Technology Inc.In Stock: 5258MT28EW128ABA1LJS-0SIT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The MT28EW128ABA1LJS-0SIT qualifies as a substitute for the JS28F064M29EWLA based on the following critical parameters:

Matching Parameters:

• Identical manufacturer (Micron Technology Inc.)
• Identical memory interface (Parallel)
• Identical package type (56-TFSOP, 0.724", 18.40mm Width)
• Identical supply voltage range (2.7V ~ 3.6V)
• Identical operating temperature range (-40°C ~ 85°C)
• Identical RoHS3 compliance status
• Identical MSL rating (3, 168 Hours)
• Identical ECCN and HTSUS classifications

Differing Parameters:

• Memory size increased from 64Mbit to 128Mbit
• Memory organization expanded from 8M x 8, 4M x 16 to 16M x 8, 8M x 16
• Access time increased from 70 ns to 95 ns
• Write cycle time decreased from 70 ns to 60 ns
• Product status changed from Obsolete to Active

The substitute part maintains full electrical and mechanical compatibility while offering increased memory capacity and active product status.

Parameter Comparison

Engineering Selection Recommendations

The MT28EW128ABA1LJS-0SIT is a direct substitute for the JS28F064M29EWLA in applications where the following conditions are met:

• The system design accommodates the increased memory capacity (128Mbit vs. 64Mbit)
• The application tolerates the extended access time (95 ns vs. 70 ns)
• The firmware or software is compatible with the expanded memory organization (16M x 8, 8M x 16)
• Pin-level compatibility is confirmed in the target application

Both parts maintain identical electrical specifications for supply voltage, operating temperature, and compliance certifications. The substitute part offers the advantage of active product status, ensuring continued availability and manufacturing support. The identical package footprint and mounting type enable direct PCB-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can MT28EW128ABA1LJS-0SIT be used as a direct pin-for-pin replacement?

A: Yes, both parts use the identical 56-TFSOP package with matching pin assignments for parallel memory interface. Physical and electrical pin compatibility is maintained.

Q: What is the impact of the 25 ns increase in access time?

A: The substitute part has an access time of 95 ns compared to 70 ns for the original part. System timing analysis is required to confirm compatibility with existing memory access cycles.

Q: Does the doubled memory capacity require firmware changes?

A: The increased memory size (128Mbit vs. 64Mbit) and expanded organization (16M x 8, 8M x 16 vs. 8M x 8, 4M x 16) may require address decoding adjustments or firmware modifications depending on the application architecture.

Q: Are both parts RoHS compliant?

A: Yes, both the JS28F064M29EWLA and MT28EW128ABA1LJS-0SIT are ROHS3 compliant with identical MSL ratings of 3 (168 Hours).

Q: Why is the original part obsolete?

A: The JS28F064M29EWLA is classified as obsolete by the manufacturer. The MT28EW128ABA1LJS-0SIT maintains active product status, ensuring long-term availability and manufacturing continuity.

Q: Are the supply voltage requirements identical?

A: Yes, both parts operate within the identical voltage range of 2.7V to 3.6V, requiring no power supply modifications.