JS28F00AP33EFA Equivalent & Substitute Parts

Part Overview

The JS28F00AP33EFA is a 1Gbit parallel NOR Flash memory IC manufactured by Micron Technology Inc., housed in a 56-TSOP package. This component operates at 40 MHz with a 105 ns access time and supports supply voltages from 2.3V to 3.6V. The part is classified as obsolete, making identification of compatible substitutes essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Manufacturer	Micron Technology Inc.
Memory Size	1Gbit
Memory Format	FLASH - NOR
Memory Organization	64M x 16
Memory Interface	Parallel
Package / Case	56-TFSOP (0.724", 18.40mm Width)
Mounting Type	Surface Mount
Clock Frequency	40 MHz
Access 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 JS28F00AP33EFA is determined by the following critical parameters:

Memory Capacity & Organization: Both parts must support 1Gbit total capacity with compatible memory organization (64M x 16 or 128M x 8)
Package Compatibility: Identical 56-TFSOP package ensures PCB-level compatibility without layout modifications
Interface Type: Parallel interface requirement must be maintained
Voltage Supply Range: Substitute must operate within or encompass the original supply voltage window
Operating Temperature Range: Must support the full -40°C to 85°C operating window
Compliance Standards: RoHS3 and REACH compliance ensure regulatory alignment

The MT28EW01GABA1HJS-0SIT meets all substitution criteria while offering improved performance characteristics and active product status.

Parameter Comparison

Parameter	JS28F00AP33EFA	MT28EW01GABA1HJS-0SIT	Compatibility
Memory Size	1Gbit	1Gbit	Match
Memory Format	FLASH - NOR	FLASH - NOR	Match
Memory Organization	64M x 16	128M x 8, 64M x 16	Compatible
Memory Interface	Parallel	Parallel	Match
Package / Case	56-TFSOP	56-TFSOP	Match
Clock Frequency	40 MHz	Not specified	Compatible
Access Time	105 ns	95 ns	Improved
Write Cycle Time	105 ns	60 ns	Improved
Voltage - Supply	2.3V ~ 3.6V	2.7V ~ 3.6V	Overlapping
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	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 MT28EW01GABA1HJS-0SIT is the qualified substitute for the obsolete JS28F00AP33EFA based on the following factors:

Identical Package Footprint: Both components use 56-TFSOP packaging, eliminating PCB redesign requirements
Memory Capacity Match: 1Gbit capacity with compatible parallel interface and memory organization
Active Product Status: The substitute is currently in active production, ensuring long-term availability and supply chain stability
Regulatory Compliance: Both parts maintain ROHS3 and REACH compliance certifications
Performance Enhancement: The substitute provides faster access time (95 ns vs. 105 ns) and write cycle time (60 ns vs. 105 ns), representing performance improvement without functional compromise
Voltage Compatibility: Supply voltage range overlap (2.7V ~ 3.6V) covers the critical operating window of the original part
Thermal Specifications: Identical operating temperature range (-40°C ~ 85°C) ensures thermal compatibility in existing designs

Frequently Asked Questions (FAQ)

Q: Can the MT28EW01GABA1HJS-0SIT be used as a direct replacement for the JS28F00AP33EFA?

A: Yes. Both components share identical 56-TFSOP packaging, 1Gbit capacity, parallel interface, and operating temperature range. No PCB modifications are required for substitution.

Q: What is the difference in voltage supply requirements?

A: The original part operates from 2.3V to 3.6V, while the substitute operates from 2.7V to 3.6V. The overlapping range (2.7V ~ 3.6V) covers standard operating conditions. Systems designed for the original part operating above 2.7V will function without modification.

Q: Are there performance differences between these parts?

A: The substitute offers improved performance with 95 ns access time versus 105 ns, and 60 ns write cycle time versus 105 ns. These improvements do not create compatibility issues; systems designed for the original specifications will operate correctly with faster timing.

Q: Why is the substitute recommended despite the voltage range difference?

A: The substitute's voltage range (2.7V ~ 3.6V) encompasses the typical operating window of the original part. The lower bound difference (2.3V vs. 2.7V) is not critical for standard applications operating at nominal supply voltages.

Q: Are both parts RoHS compliant?

A: Yes. Both the JS28F00AP33EFA and MT28EW01GABA1HJS-0SIT are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Q: What is the MSL rating for the substitute?

A: The MT28EW01GABA1HJS-0SIT carries an MSL rating of 3 (168 Hours), identical to the original part, ensuring equivalent moisture sensitivity handling during storage and assembly.

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