JS28F00AP33BFA Equivalent & Substitute Parts

Part Overview

The JS28F00AP33BFA 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 a supply voltage range of 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
Memory Size	1Gbit
Memory Format	FLASH - NOR
Memory Organization	64M x 16
Memory Interface	Parallel
Clock Frequency	40 MHz
Access Time	105 ns
Write Cycle Time	105 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 MT28EW01GABA1LJS-0SIT qualifies as a direct substitute for the JS28F00AP33BFA based on the following critical parameters:

Matching Parameters:

Memory capacity: 1Gbit
Memory technology: FLASH - NOR
Memory interface: Parallel
Package type: 56-TFSOP
Mounting type: Surface Mount
Operating temperature range: -40°C ~ 85°C
RoHS3 compliance
MSL rating: 3 (168 Hours)

Allowable Variations:

Memory organization: MT28EW01GABA1LJS-0SIT supports both 128M x 8 and 64M x 16 configurations, providing backward compatibility with the 64M x 16 organization of the original part
Access time: 95 ns (faster than the original 105 ns requirement)
Write cycle time: 60 ns (faster than the original 105 ns requirement)
Voltage supply range: 2.7V ~ 3.6V (subset of the original 2.3V ~ 3.6V range, suitable for standard 3.3V applications)
Clock frequency: Not specified for the substitute, but performance metrics indicate compatibility

Parameter Comparison

Parameter	JS28F00AP33BFA	MT28EW01GABA1LJS-0SIT	Compatibility
Memory Size	1Gbit	1Gbit	Identical
Memory Format	FLASH - NOR	FLASH - NOR	Identical
Memory Organization	64M x 16	128M x 8, 64M x 16	Compatible
Memory Interface	Parallel	Parallel	Identical
Access Time	105 ns	95 ns	Compatible (faster)
Write Cycle Time	105 ns	60 ns	Compatible (faster)
Voltage Supply Range	2.3V ~ 3.6V	2.7V ~ 3.6V	Compatible (subset)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical
Package Type	56-TFSOP	56-TFSOP	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
MSL Rating	3 (168 Hours)	3 (168 Hours)	Identical

Engineering Selection Recommendations

The MT28EW01GABA1LJS-0SIT is suitable as a substitute for the obsolete JS28F00AP33BFA in applications requiring 1Gbit parallel NOR Flash memory. The substitute part maintains identical package geometry, thermal operating range, and compliance certifications. Performance improvements in access time and write cycle time provide enhanced speed characteristics without compromising backward compatibility.

The substitute part carries Active product status, ensuring continued availability and supply chain support. Both parts maintain ROHS3 compliance and identical MSL ratings, supporting equivalent handling and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can MT28EW01GABA1LJS-0SIT directly replace JS28F00AP33BFA on existing PCBs?

A: Yes. Both parts use identical 56-TFSOP packaging with matching pinout and footprint geometry, enabling direct PCB-level substitution without layout modifications.

Q: What is the significance of the different memory organization specifications?

A: The substitute part supports both 128M x 8 and 64M x 16 configurations. The 64M x 16 mode provides direct functional equivalence to the original part. The dual-mode capability offers design flexibility without compromising compatibility.

Q: Are there voltage supply considerations for substitution?

A: The substitute part operates within 2.7V to 3.6V, which is a subset of the original part's 2.3V to 3.6V range. For applications using standard 3.3V supply rails, the substitute is fully compatible. Applications requiring operation below 2.7V require design review.

Q: How do the timing specifications affect system integration?

A: The substitute part provides faster access time (95 ns versus 105 ns) and write cycle time (60 ns versus 105 ns). These improvements are backward compatible with designs specified for the original part's timing parameters.

Q: What is the product status difference between these parts?

A: JS28F00AP33BFA is classified as obsolete, while MT28EW01GABA1LJS-0SIT maintains active product status. This ensures continued manufacturing, quality support, and supply availability for the substitute part.

Q: Are handling and storage requirements identical?

A: Yes. Both parts carry MSL rating 3 (168 Hours), requiring identical moisture control and storage protocols during component handling and assembly operations.

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