JS28F128J3F75B Equivalent & Substitute Parts

Part Overview

The JS28F128J3F75B is a 128Mbit parallel NOR FLASH memory IC manufactured by Alliance Memory, Inc., housed in a 56-TSOP surface mount package. This component operates at 2.7V to 3.6V supply voltage with an access time of 75 nanoseconds and supports memory organization of 16M x 8 or 8M x 16 configurations. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity.

Substiute Parts

JS28F128J3F75B

Alliance Memory, Inc.In Stock: 1415JS28F128J3F75B Datasheet

Current PartRFQ

MT28EW128ABA1HJS-0SIT TR

Micron Technology Inc.In Stock: 2322MT28EW128ABA1HJS-0SIT TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete JS28F128J3F75B is determined by strict equivalence across the following critical parameters:

Memory Capacity & Organization: The substitute must provide 128Mbit total capacity with 16M x 8 or 8M x 16 organization to maintain functional compatibility with existing circuit designs and firmware.

Technology & Interface: The substitute must utilize FLASH - NOR technology with parallel interface architecture to ensure pin-level and protocol compatibility without redesign.

Electrical Specifications: Supply voltage range of 2.7V to 3.6V and operating temperature range of -40°C to 85°C must be maintained for system integration without modification.

Package & Mounting: The 56-TFSOP surface mount package with 0.724" (18.40mm) width is mandatory for PCB layout compatibility and assembly process continuity.

Compliance & Certifications: ROHS3 compliance, MSL rating of 3, and REACH unaffected status ensure regulatory and environmental compatibility.

The MT28EW128ABA1HJS-0SIT TR from Micron Technology Inc. meets all substitution criteria and is classified as an active product with current inventory availability.

Parameter Comparison

Engineering Selection Recommendations

The MT28EW128ABA1HJS-0SIT TR is a direct functional substitute for the obsolete JS28F128J3F75B. Both components share identical memory capacity, organization, interface type, voltage specifications, temperature range, package geometry, and compliance certifications.

The substitute part is manufactured by Micron Technology Inc., an established supplier with active product status and confirmed inventory availability of 2215 units. This ensures supply chain continuity and long-term component availability for production requirements.

The MT28EW128ABA1HJS-0SIT TR is supplied in Tape & Reel (TR) packaging format, suitable for automated assembly processes. Both parts maintain ROHS3 compliance and identical MSL ratings, eliminating additional qualification requirements for manufacturing and storage procedures.

Access time specification of the substitute (95 ns) is slower than the original part (75 ns), while write cycle time (60 ns) is faster. These timing differences must be evaluated against specific application timing requirements to confirm functional compatibility in the target circuit design.

Frequently Asked Questions (FAQ)

Q: Can the MT28EW128ABA1HJS-0SIT TR be used as a direct replacement without PCB modification?

A: Yes. Both parts utilize identical 56-TFSOP package geometry with 0.724" (18.40mm) width and surface mount configuration. Pin assignments and electrical interface are compatible, eliminating PCB redesign requirements.

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

A: The original JS28F128J3F75B specifies 75 ns access time, while the substitute MT28EW128ABA1HJS-0SIT TR specifies 95 ns. This 20 ns difference represents slower read access. Circuit designs with timing-critical read operations must confirm that 95 ns access time meets application requirements.

Q: Are there differences in write performance between these parts?

A: Yes. The original part specifies 75 ns write cycle time, while the substitute specifies 60 ns. The substitute provides faster write operations, which is generally advantageous and does not create compatibility issues.

Q: Do both parts support the same memory organization configurations?

A: Yes. Both the JS28F128J3F75B and MT28EW128ABA1HJS-0SIT TR support 16M x 8 and 8M x 16 memory organization, ensuring firmware and circuit design compatibility.

Q: Are there any compliance or environmental differences between these parts?

A: No. Both parts are ROHS3 compliant, carry identical MSL ratings of 3 (168 Hours), and are REACH unaffected. No additional environmental or regulatory qualification is required for substitution.

Q: What is the difference between standard packaging and Tape & Reel (TR) format?

A: Tape & Reel (TR) packaging is the standard format for automated assembly processes. The MT28EW128ABA1HJS-0SIT TR is supplied on continuous tape wound on reels, compatible with pick-and-place equipment used in high-volume manufacturing.

Q: Is the substitute part currently available in inventory?

A: Yes. The MT28EW128ABA1HJS-0SIT TR has confirmed inventory of 2215 units in new original condition, compared to 1313 units of the obsolete original part.

Q: Do both parts operate across the same voltage and temperature ranges?

A: Yes. Both parts operate at 2.7V to 3.6V supply voltage and -40°C to 85°C operating temperature range, ensuring system integration without modification to power supply or thermal management designs.