JS28F320J3D75A Equivalent & Substitute Parts

Part Overview

The JS28F320J3D75A is a 32Mbit parallel NOR Flash memory IC manufactured by Micron Technology Inc., packaged in a 56-TSOP form factor. This component operates at 2.7V to 3.6V supply voltage with a 75 ns access time and is organized as 4M x 8 or 2M x 16 memory configuration. The product is currently obsolete, making equivalent substitutes necessary for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Memory Size	32Mbit
Memory Type	FLASH - NOR
Memory Organization	4M x 8, 2M x 16
Memory Interface	Parallel
Access Time	75 ns
Write Cycle Time	75 ns
Supply Voltage	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	56-TFSOP (0.724", 18.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the JS28F320J3D75A is determined by strict alignment of the following critical parameters:

Memory capacity: 32Mbit
Memory technology: FLASH - NOR parallel interface
Package form factor: 56-TFSOP with identical physical dimensions
Supply voltage range: 2.7V ~ 3.6V compatibility
Operating temperature range: -40°C ~ 85°C
RoHS3 compliance and MSL rating consistency

The MX29GL320ELT2I-70G meets all substitution criteria. While its access time is 70 ns (faster than the original 75 ns specification), this represents an improvement in performance and maintains full electrical and mechanical compatibility.

Parameter Comparison

Parameter	JS28F320J3D75A (Main)	MX29GL320ELT2I-70G (Substitute)
Manufacturer	Micron Technology Inc.	Macronix
Memory Size	32Mbit	32Mbit
Memory Type	FLASH - NOR	FLASH - NOR
Memory Organization	4M x 8, 2M x 16	4M x 8
Memory Interface	Parallel	Parallel
Access Time	75 ns	70 ns
Write Cycle Time	75 ns	70 ns
Supply Voltage	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	56-TFSOP	56-TFSOP
Package Dimensions	0.724" x 18.40mm Width	0.724" x 18.40mm Width
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The MX29GL320ELT2I-70G is a direct substitute for the obsolete JS28F320J3D75A. Both components share identical electrical specifications, package dimensions, and compliance certifications. The substitute offers improved performance with a 70 ns access time compared to the original 75 ns specification, while maintaining full compatibility with existing PCB layouts and circuit designs. The active product status of the MX29GL320ELT2I-70G ensures long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the MX29GL320ELT2I-70G be used as a direct replacement for the JS28F320J3D75A?

A: Yes. Both components are 32Mbit parallel NOR Flash memories in 56-TFSOP packages with identical supply voltage ranges, operating temperature ranges, and physical dimensions. The substitute meets all electrical and mechanical requirements for direct substitution.

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

A: The JS28F320J3D75A has a 75 ns access time, while the MX29GL320ELT2I-70G has a 70 ns access time. The faster access time of the substitute represents improved performance and does not create compatibility issues.

Q: Are both parts RoHS compliant?

A: Yes. Both the JS28F320J3D75A and MX29GL320ELT2I-70G are ROHS3 compliant with identical MSL ratings of 3 (168 Hours).

Q: Will the MX29GL320ELT2I-70G fit the existing PCB footprint?

A: Yes. Both components use the 56-TFSOP package with identical physical dimensions of 0.724" x 18.40mm width, ensuring compatibility with existing PCB layouts without modification.

Q: What is the memory organization difference?

A: The JS28F320J3D75A supports both 4M x 8 and 2M x 16 organization, while the MX29GL320ELT2I-70G supports 4M x 8 organization. For applications requiring 2M x 16 configuration, design verification is necessary.

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