JS28F640P33TF70A Equivalent & Substitute Parts

Part Overview

The JS28F640P33TF70A 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 70 ns access time and supports a supply voltage range of 2.3V to 3.6V. The device is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Manufacturer	Micron Technology Inc.
Memory Size	64Mbit
Memory Format	FLASH - NOR
Memory Organization	4M x 16
Memory Interface	Parallel
Clock Frequency	40 MHz
Access Time	70 ns
Write Cycle Time	70 ns
Voltage Supply Range	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	56-TFSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

The MT28EW128ABA1HJS-0SIT qualifies as a substitute based on the following alignment of critical parameters:

Compatible Parameters:

Manufacturer: Micron Technology Inc. (same source)
Memory Technology: FLASH - NOR (identical technology)
Memory Interface: Parallel (identical interface type)
Package Type: 56-TFSOP (identical physical package)
Operating Temperature Range: -40°C ~ 85°C (identical range)
RoHS Status: ROHS3 Compliant (equivalent compliance)
MSL Rating: 3 (168 Hours) (identical rating)

Substitution Basis: Both devices share identical package geometry, interface architecture, and environmental specifications. The substitute part maintains backward compatibility at the board level while offering increased memory capacity (128Mbit vs. 64Mbit) and improved performance characteristics.

Parameter Comparison

Parameter	JS28F640P33TF70A (Main)	MT28EW128ABA1HJS-0SIT (Substitute)
Memory Size	64Mbit	128Mbit
Memory Organization	4M x 16	16M x 8, 8M x 16
Clock Frequency	40 MHz	Not specified
Access Time	70 ns	95 ns
Write Cycle Time	70 ns	60 ns
Voltage Supply Range	2.3V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TC)	-40°C ~ 85°C (TA)
Package Type	56-TFSOP	56-TFSOP
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The MT28EW128ABA1HJS-0SIT is suitable as a substitute for the obsolete JS28F640P33TF70A based on the following factors:

Product Availability: The substitute is classified as Active with 18,005 units in stock, compared to the obsolete status of the main part.
Package Compatibility: Identical 56-TFSOP package ensures direct board-level compatibility without layout modifications.
Compliance Alignment: Both parts maintain ROHS3 compliance and identical MSL ratings, supporting equivalent handling and storage requirements.
Voltage Compatibility: The substitute's 2.7V minimum supply voltage is compatible with systems operating within the 2.7V to 3.6V range. Systems requiring operation below 2.7V require verification of actual supply voltage specifications.
Temperature Range: Identical operating temperature specifications (-40°C to 85°C) ensure equivalent thermal performance.

Frequently Asked Questions (FAQ)

Q: Can the MT28EW128ABA1HJS-0SIT directly replace the JS28F640P33TF70A on existing PCBs?

A: Yes. Both devices use the 56-TFSOP package with identical pin assignments and physical dimensions. No PCB modifications are required for physical installation.

Q: What are the differences in memory capacity between these parts?

A: The substitute provides 128Mbit capacity compared to the original 64Mbit. This increased capacity does not affect compatibility but may require firmware or software adjustments if the system relies on specific memory addressing schemes.

Q: Are there voltage supply differences I should consider?

A: The original part supports 2.3V to 3.6V, while the substitute supports 2.7V to 3.6V. If your system operates below 2.7V, verify actual supply voltage specifications before substitution.

Q: How do access times compare between these parts?

A: The original part specifies 70 ns access time, while the substitute specifies 95 ns. This difference may impact timing-critical applications. Verify system timing requirements before substitution.

Q: Are both parts RoHS compliant?

A: Yes. Both the JS28F640P33TF70A and MT28EW128ABA1HJS-0SIT are ROHS3 compliant and carry identical MSL ratings of 3 (168 Hours).

Q: What is the product status difference?

A: The original part is obsolete with limited availability. The substitute is classified as Active with robust inventory levels, ensuring long-term procurement viability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message