Equivalent & Substitute Parts for JS28F640J3F75B TR

Part Overview

The JS28F640J3F75B TR is a 64Mbit parallel NOR Flash memory IC manufactured by Micron Technology Inc., packaged in 56-TSOP with tape and reel delivery. This component is classified as obsolete, making substitute parts necessary for new designs and production continuity. The part operates across industrial temperature ranges (-40°C to 85°C) and complies with ROHS3 and REACH standards.

Key Parameters

Parameter	Value
Manufacturer Part Number	JS28F640J3F75B TR
Memory Size	64Mbit
Memory Format	FLASH - NOR
Memory Organization	8M x 8, 4M x 16
Memory Interface	Parallel
Access Time	75 ns
Write Cycle Time	75 ns
Voltage Supply	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	56-TFSOP (0.724", 18.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the JS28F640J3F75B TR is based on the following critical parameters:

Memory Technology: FLASH - NOR (non-volatile parallel interface)
Package Compatibility: 56-TFSOP form factor with identical 18.40mm width
Electrical Compatibility: Voltage supply range 2.7V ~ 3.6V
Operating Temperature Range: -40°C ~ 85°C
Compliance Standards: ROHS3 and REACH compliance maintained
Interface Type: Parallel memory interface

The substitute parts identified (MT28EW128ABA1HJS-0SIT variants) maintain identical packaging, voltage specifications, temperature range, and compliance certifications. These parts are manufactured by the same supplier (Micron Technology Inc.) and are currently in active production status, ensuring long-term availability.

Parameter Comparison

Parameter	JS28F640J3F75B TR	MT28EW128ABA1HJS-0SIT	MT28EW128ABA1HJS-0SIT TR
Manufacturer	Micron Technology Inc.	Micron Technology Inc.	Micron Technology Inc.
Memory Size	64Mbit	128Mbit	128Mbit
Memory Format	FLASH - NOR	FLASH - NOR	FLASH - NOR
Memory Interface	Parallel	Parallel	Parallel
Access Time	75 ns	95 ns	95 ns
Write Cycle Time	75 ns	60 ns	60 ns
Voltage Supply	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	56-TFSOP	56-TFSOP	56-TFSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active
Packaging Type	Tape & Reel (TR)	Tray	Tape & Reel (TR)

Engineering Selection Recommendations

The MT28EW128ABA1HJS-0SIT and MT28EW128ABA1HJS-0SIT TR are direct substitutes for the obsolete JS28F640J3F75B TR based on electrical and mechanical compatibility. Both substitute parts maintain identical voltage supply ranges, operating temperature specifications, and package form factors. The substitutes are currently in active production status with ROHS3 and REACH compliance certification.

The primary difference is memory capacity: substitute parts provide 128Mbit versus the original 64Mbit. Access time increases from 75 ns to 95 ns, while write cycle time improves from 75 ns to 60 ns. These timing differences are within typical system tolerance margins for parallel NOR Flash applications.

Selection between MT28EW128ABA1HJS-0SIT (Tray packaging) and MT28EW128ABA1HJS-0SIT TR (Tape & Reel packaging) depends on production volume and assembly requirements. Tape & Reel packaging is standard for automated pick-and-place assembly operations.

Frequently Asked Questions (FAQ)

Q: Can MT28EW128ABA1HJS-0SIT directly replace JS28F640J3F75B TR without PCB modifications?

A: Yes. Both parts use identical 56-TFSOP packaging with matching pin configurations and electrical specifications (2.7V ~ 3.6V supply, -40°C ~ 85°C operating range). No PCB layout changes are required.

Q: What is the impact of the increased memory size (128Mbit vs 64Mbit)?

A: The substitute provides double the storage capacity. System firmware and software must be compatible with the larger address space. Pin configurations remain identical.

Q: How do the timing differences affect system compatibility?

A: Access time increases from 75 ns to 95 ns (20 ns slower). Write cycle time improves from 75 ns to 60 ns (15 ns faster). These changes are within acceptable margins for most parallel NOR Flash applications. System timing analysis is required for critical path operations.

Q: What is the difference between Tray and Tape & Reel packaging?

A: Tape & Reel (TR) packaging is optimized for automated assembly with pick-and-place equipment. Tray packaging is suitable for manual assembly or lower-volume production. Electrical and mechanical specifications are identical.

Q: Are both substitute parts currently available?

A: Yes. MT28EW128ABA1HJS-0SIT TR has 2,215 units in stock. MT28EW128ABA1HJS-0SIT (Tray) has 18,005 units in stock. Both are active production parts from Micron Technology Inc.

Q: Do the substitute parts maintain compliance certifications?

A: Yes. Both MT28EW128ABA1HJS-0SIT variants are ROHS3 compliant and REACH unaffected, matching the original part's compliance status.

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