JS28F128M29EWLA Equivalent & Substitute Parts

Part Overview

The JS28F128M29EWLA is a 128Mbit NOR Flash memory IC manufactured by Micron Technology Inc., designed for parallel interface applications in 56-TSOP surface mount packaging. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement. The part delivers 70 ns access time with 2.7V to 3.6V supply voltage operation across the industrial temperature range of -40°C to 85°C.

Substiute Parts

JS28F128M29EWLA

Micron Technology Inc.In Stock: 7801JS28F128M29EWLA Datasheet

Current PartRFQ

MT28EW128ABA1LJS-0SIT

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the JS28F128M29EWLA is determined by the following critical parameters:

Memory capacity and organization must remain constant at 128Mbit with 16M x 8 or 8M x 16 configuration to ensure address and data bus compatibility. The parallel interface requirement is non-negotiable for direct replacement in existing circuit designs. Package type must be 56-TFSOP to maintain PCB footprint compatibility and mounting characteristics. Supply voltage range of 2.7V to 3.6V ensures compatibility with existing power distribution networks. Operating temperature range of -40°C to 85°C must be maintained for environmental specification compliance.

The MT28EW128ABA1LJS-0SIT qualifies as a substitute part because it maintains identical memory capacity, organization, parallel interface, package type, voltage supply range, and operating temperature specifications. While access time differs (95 ns versus 70 ns), this represents a relaxed timing specification that does not prevent functional substitution in applications where the original 70 ns specification was not a critical design constraint.

Parameter Comparison

Engineering Selection Recommendations

The MT28EW128ABA1LJS-0SIT is suitable for replacement of the obsolete JS28F128M29EWLA based on matching electrical specifications, identical package footprint, and active product status. Both components maintain ROHS3 compliance and identical MSL ratings, ensuring regulatory and manufacturing process compatibility.

The primary consideration for substitution is the access time specification difference: the substitute part specifies 95 ns versus the original 70 ns. This represents a 25 ns increase in read access latency. Component selection should be based on whether the application timing budget accommodates this relaxed specification. If the original design incorporated the 70 ns specification as a critical timing constraint, system-level timing analysis is required to confirm compatibility with the 95 ns substitute.

Frequently Asked Questions (FAQ)

Q: Can MT28EW128ABA1LJS-0SIT be used as a direct replacement for JS28F128M29EWLA?

A: Yes, from a package and electrical interface perspective. Both components share identical 56-TFSOP packaging, memory capacity, organization, parallel interface, voltage supply range, and operating temperature specifications. The access time difference (95 ns versus 70 ns) must be evaluated against application timing requirements.

Q: What is the significance of the access time difference between these parts?

A: Access time defines the maximum delay from address setup to valid data output. The substitute part's 95 ns specification is slower than the original 70 ns. Applications with timing-critical read operations must confirm that system timing margins accommodate the 25 ns increase.

Q: Are there any packaging or mounting differences?

A: No. Both parts use identical 56-TFSOP surface mount packaging with 0.724" width and 18.40mm dimensions. PCB footprints and reflow soldering profiles are compatible.

Q: What is the product status significance?

A: The original JS28F128M29EWLA is classified as obsolete, indicating discontinued manufacturing and limited availability. The MT28EW128ABA1LJS-0SIT maintains active product status, ensuring ongoing availability and manufacturing support from Micron Technology Inc.

Q: Are compliance certifications identical?

A: Yes. Both components are ROHS3 compliant with identical MSL ratings of 3 (168 Hours), ensuring compatibility with current manufacturing processes and environmental regulations.