JS28F640P30BF75A Equivalent & Substitute Parts

Part Overview

The JS28F640P30BF75A 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 as non-volatile storage with a 40 MHz clock frequency and 75 ns access time, designed for applications requiring reliable parallel Flash memory interfaces.

Substiute Parts

JS28F640P30BF75A

Micron Technology Inc.In Stock: 1835JS28F640P30BF75A Datasheet

Current PartRFQ

MT28EW128ABA1LJS-0SIT

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the JS28F640P30BF75A is determined by the following critical parameters:

Physical Compatibility: The substitute part must use the same 56-TFSOP package with identical 0.724" (18.40mm) width to ensure PCB footprint compatibility and mounting feasibility.

Electrical Interface: The substitute must maintain parallel memory interface architecture to support existing system bus connections and signal protocols.

Memory Technology: Both parts must use FLASH - NOR technology to ensure functional equivalence in read/write operations and data retention characteristics.

Operating Conditions: The substitute must support the operating temperature range of -40°C to 85°C and maintain compliance with RoHS3 and REACH standards.

Voltage Supply Range: While the original part operates at 1.7V ~ 2V, substitute parts may operate at different voltage ranges provided the system design accommodates voltage regulation or level shifting as required.

The MT28EW128ABA1LJS-0SIT meets these substitution criteria through identical package geometry, parallel interface architecture, NOR Flash technology, matching temperature range, and equivalent compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The MT28EW128ABA1LJS-0SIT is available as an active product with current manufacturing support, addressing the obsolescence status of the JS28F640P30BF75A. Both components share identical package geometry, operating temperature range, and compliance certifications (ROHS3, REACH Unaffected).

Key differences requiring system-level evaluation:

Memory Capacity: The substitute provides 128Mbit capacity versus 64Mbit in the original part. System designs with fixed memory addressing may require firmware or hardware modifications to utilize the additional capacity.

Voltage Supply Range: The substitute operates at 2.7V ~ 3.6V versus 1.7V ~ 2V for the original. Power supply circuits must be verified to deliver the required voltage range, or voltage regulation circuitry must be implemented.

Access Time: The substitute specifies 95 ns access time versus 75 ns for the original. System timing analysis must confirm that the slower access time does not violate critical path requirements.

Write Cycle Time: The substitute specifies 60 ns write cycle time versus 75 ns for the original, representing improved write performance.

Selection of the MT28EW128ABA1LJS-0SIT is appropriate for applications where memory capacity expansion is acceptable, voltage supply can be adjusted to 2.7V ~ 3.6V range, and system timing tolerates the 95 ns access time specification.

Frequently Asked Questions (FAQ)

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

A: Both parts use the 56-TFSOP package with identical physical dimensions. Pin compatibility depends on system design. The substitute supports 8M x 16 organization matching the original 4M x 16 configuration, enabling functional compatibility in parallel interface applications. Voltage supply differences require circuit verification.

Q: What is the impact of the 95 ns access time on system performance?

A: The substitute's 95 ns access time is 20 ns slower than the original 75 ns specification. System timing analysis must confirm that memory read operations complete within required cycle times. Applications with tight timing constraints may experience performance degradation.

Q: How does the increased memory capacity affect compatibility?

A: The 128Mbit capacity provides double the storage of the original 64Mbit part. Systems with fixed memory addressing schemes may require firmware updates or address decoding modifications to access the additional memory space. Applications designed to use only 64Mbit of the available capacity will function without modification.

Q: Are there voltage supply considerations for substitution?

A: The original part operates at 1.7V ~ 2V, while the substitute requires 2.7V ~ 3.6V. Power supply circuits must be evaluated to deliver the higher voltage range. Existing 1.7V ~ 2V supplies cannot directly power the substitute without voltage regulation or conversion circuitry.

Q: Do both parts meet the same compliance standards?

A: Both components are ROHS3 compliant and REACH unaffected, meeting equivalent environmental and regulatory requirements. MSL ratings are identical at Level 3 (168 Hours), requiring equivalent moisture control during storage and handling.