JS28F640P30TF75A Equivalent & Substitute Parts

Part Overview

The JS28F640P30TF75A is a 64Mbit parallel NOR Flash memory IC manufactured by Micron Technology Inc., housed in a 56-TSOP package. This component operates at 40 MHz with a 75 ns access time and is designed for non-volatile storage applications requiring parallel interface connectivity. The part is classified as obsolete, making identification of compatible substitutes essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer	Micron Technology Inc.
Memory Type	Non-Volatile FLASH - NOR
Memory Size	64Mbit
Memory Organization	4M x 16
Memory Interface	Parallel
Clock Frequency	40 MHz
Access Time	75 ns
Write Cycle Time	75 ns
Voltage Supply	1.7V ~ 2V
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 JS28F640P30TF75A is determined by the following critical parameters:

Physical Compatibility: Package type (56-TFSOP), mounting type (Surface Mount), and physical dimensions must match to ensure PCB layout compatibility without redesign.

Functional Compatibility: Memory interface (Parallel), memory format (FLASH - NOR), and memory organization must support the same data bus width and addressing scheme.

Electrical Compatibility: Operating voltage range, access time, and write cycle time must meet or exceed the performance requirements of the original design.

Environmental & Compliance: Operating temperature range, RoHS compliance status, and MSL rating must satisfy application requirements and regulatory standards.

The MT28EW128ABA1HJS-0SIT qualifies as a substitute based on matching package geometry, parallel interface architecture, identical operating temperature range, equivalent RoHS compliance, and identical MSL rating. However, differences in memory capacity, voltage supply range, and access time characteristics must be evaluated against specific application requirements.

Parameter Comparison

Parameter	JS28F640P30TF75A	MT28EW128ABA1HJS-0SIT
Manufacturer	Micron Technology Inc.	Micron Technology Inc.
Memory Type	Non-Volatile FLASH - NOR	Non-Volatile FLASH - NOR
Memory Size	64Mbit	128Mbit
Memory Organization	4M x 16	16M x 8, 8M x 16
Memory Interface	Parallel	Parallel
Access Time	75 ns	95 ns
Write Cycle Time	75 ns	60 ns
Voltage Supply	1.7V ~ 2V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	56-TFSOP (0.724", 18.40mm Width)	56-TFSOP (0.724", 18.40mm Width)
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

For Obsolete Part Replacement: The MT28EW128ABA1HJS-0SIT is an active product from the same manufacturer with identical package geometry and operating temperature range. Both components maintain ROHS3 compliance and equivalent MSL ratings, satisfying regulatory and environmental requirements.

Voltage Supply Consideration: The substitute operates at 2.7V ~ 3.6V versus the original 1.7V ~ 2V. System power supply architecture must accommodate this voltage differential.

Memory Capacity: The substitute provides 128Mbit capacity versus 64Mbit in the original. Applications with fixed memory addressing schemes must evaluate whether the increased capacity creates compatibility issues or requires firmware modification.

Access Time Performance: The substitute specifies 95 ns access time compared to 75 ns in the original. Systems with timing-critical operations must confirm that the slower access time does not violate performance specifications.

Product Status: The substitute is classified as active, ensuring long-term availability and supply chain stability compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can MT28EW128ABA1HJS-0SIT be used as a direct pin-for-pin replacement?

A: Both components use the 56-TFSOP package with identical physical dimensions. Pin compatibility depends on the specific memory organization configuration selected on the substitute part. The MT28EW128ABA1HJS-0SIT supports both 16M x 8 and 8M x 16 organization modes. Verification of address and data bus pin assignments against your circuit schematic is required.

Q: What is the impact of the voltage supply difference?

A: The original part operates at 1.7V ~ 2V, while the substitute requires 2.7V ~ 3.6V. This difference necessitates evaluation of your system's power supply design. If your circuit is designed for low-voltage operation, the substitute may not be compatible without power supply modifications.

Q: Does the increased memory capacity of the substitute create compatibility issues?

A: The substitute provides double the memory capacity (128Mbit vs. 64Mbit). If your application uses fixed memory addressing or firmware that assumes 64Mbit capacity, the additional memory space may require software modification or may be unused. Parallel interface operation remains compatible.

Q: How does the access time difference affect system performance?

A: The substitute specifies 95 ns access time versus 75 ns in the original. This 20 ns increase may impact timing-critical operations. Systems operating at or near maximum clock frequency should evaluate whether this slower access time violates performance requirements.

Q: Are both parts suitable for the same environmental conditions?

A: Yes. Both components specify identical operating temperature range (-40°C ~ 85°C), RoHS3 compliance, and MSL rating (3, 168 Hours), making them equivalent for environmental and regulatory compliance purposes.

Q: What is the availability status of each part?

A: The original JS28F640P30TF75A is classified as obsolete. The MT28EW128ABA1HJS-0SIT is classified as active, indicating current production and long-term supply availability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message