JS28F512P33BFD Equivalent & Substitute Parts

Part Overview

The JS28F512P33BFD is a 512Mbit parallel NOR Flash memory IC manufactured by Micron Technology Inc., housed in a 56-TFSOP package. This component operates across a supply voltage range of 2.3V to 3.6V with an access time of 105 ns and a write cycle time of 105 ns. 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	512Mbit
Memory Format	FLASH - NOR
Memory Organization	32M x 16
Memory Interface	Parallel
Package / Case	56-TFSOP (0.724", 18.40mm Width)
Mounting Type	Surface Mount
Access Time	105 ns
Write Cycle Time	105 ns
Voltage - Supply	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the JS28F512P33BFD is determined by strict alignment of the following critical parameters:

Memory capacity: 512Mbit
Memory technology: FLASH - NOR
Memory interface: Parallel
Package type: 56-TFSOP
Mounting configuration: Surface Mount
Supply voltage compatibility: Overlapping operational ranges
Operating temperature range: -40°C ~ 85°C
RoHS and MSL compliance: ROHS3 Compliant, MSL 3

The MT28EW512ABA1LJS-0SIT qualifies as a substitute based on matching memory capacity, technology, interface, package, and mounting type. Both devices are manufactured by Micron Technology Inc. and maintain identical environmental compliance ratings.

Parameter Comparison

Parameter	JS28F512P33BFD	MT28EW512ABA1LJS-0SIT	Compatibility
Manufacturer	Micron Technology Inc.	Micron Technology Inc.	Match
Memory Size	512Mbit	512Mbit	Match
Memory Format	FLASH - NOR	FLASH - NOR	Match
Memory Organization	32M x 16	64M x 8, 32M x 16	Compatible
Memory Interface	Parallel	Parallel	Match
Package / Case	56-TFSOP (0.724", 18.40mm Width)	56-TFSOP (0.724", 18.40mm Width)	Match
Mounting Type	Surface Mount	Surface Mount	Match
Access Time	105 ns	95 ns	Compatible
Write Cycle Time	105 ns	60 ns	Compatible
Voltage - Supply	2.3V ~ 3.6V	2.7V ~ 3.6V	Overlapping
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
MSL Rating	3 (168 Hours)	3 (168 Hours)	Match
Product Status	Obsolete	Active	Substitute is current

Engineering Selection Recommendations

The MT28EW512ABA1LJS-0SIT is the qualified substitute for the obsolete JS28F512P33BFD. Selection is based on the following engineering criteria:

Both devices maintain identical memory capacity, technology, and interface specifications
Package and mounting configurations are identical, ensuring PCB-level compatibility
Operating temperature ranges are identical across the full industrial specification
The substitute device features improved access time (95 ns vs. 105 ns) and write cycle time (60 ns vs. 105 ns), providing performance enhancement
Both devices carry ROHS3 compliance and identical MSL ratings, ensuring environmental and handling compatibility
The substitute is currently in active production status, providing long-term supply availability compared to the obsolete original part

The supply voltage range of the substitute (2.7V ~ 3.6V) overlaps with the original specification (2.3V ~ 3.6V). System designs operating at voltages below 2.7V require verification of circuit compatibility.

Frequently Asked Questions (FAQ)

Q: Can the MT28EW512ABA1LJS-0SIT directly replace the JS28F512P33BFD on existing PCBs?

A: Yes. Both devices use identical 56-TFSOP packaging with matching pinout and footprint. No PCB modifications are required for physical substitution.

Q: What is the difference in memory organization between these parts?

A: The JS28F512P33BFD is organized as 32M x 16. The MT28EW512ABA1LJS-0SIT supports both 64M x 8 and 32M x 16 configurations. For applications requiring 32M x 16 operation, the substitute is fully compatible.

Q: Are there timing differences between these devices?

A: Yes. The MT28EW512ABA1LJS-0SIT has faster access time (95 ns vs. 105 ns) and faster write cycle time (60 ns vs. 105 ns). These improvements are backward compatible with designs specified for the original part.

Q: What is the voltage compatibility consideration?

A: The original part operates from 2.3V to 3.6V. The substitute operates from 2.7V to 3.6V. Systems designed to operate at 2.3V or 2.4V require circuit-level verification before substitution.

Q: Are both devices RoHS compliant?

A: Yes. Both the JS28F512P33BFD and MT28EW512ABA1LJS-0SIT are ROHS3 compliant with identical MSL 3 ratings (168 hours).

Q: Why is the original part listed as obsolete?

A: The JS28F512P33BFD has reached end-of-life status. The MT28EW512ABA1LJS-0SIT is the active production equivalent from the same manufacturer, ensuring continued component availability.

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