AT28BV16-30JC Equivalent & Substitute Parts

Part Overview

The AT28BV16-30JC is a 16Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 32-PLCC package with 300 ns access time. This device is classified as obsolete, making substitute components necessary for new designs and production continuity. The part operates across a 2.7V to 3.6V supply range and supports 0°C to 70°C operating temperatures. Identifying compatible alternatives ensures design flexibility and supply chain resilience.

Key Parameters

Parameter	Value
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Format	EEPROM
Memory Interface	Parallel
Access Time	300 ns
Write Cycle Time	3 ms
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	0°C ~ 70°C
Package Type	32-PLCC (J-Lead)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT28BV16-30JC is determined by the following critical parameters:

Package Compatibility: Both main and substitute parts must use the 32-PLCC (J-Lead) package to ensure mechanical and electrical pin compatibility on existing PCBs.
Memory Interface: Parallel interface is required to maintain functional equivalence with the original design.
Voltage Supply Range: The substitute must operate within or encompass the 2.7V to 3.6V range to ensure power supply compatibility.
Pin Configuration: Identical pin count (32 pins) and pinout arrangement are mandatory for direct replacement.

The AT28BV64B-20JU qualifies as a substitute based on these criteria. While it offers increased memory capacity (64Kbit versus 16Kbit), it maintains the same package footprint, parallel interface, voltage supply compatibility, and pin configuration. The higher memory capacity does not prevent substitution in applications where address space is not fully utilized.

Parameter Comparison

Parameter	AT28BV16-30JC (Main Part)	AT28BV64B-20JU (Substitute)
Memory Size	16Kbit	64Kbit
Memory Organization	2K x 8	8K x 8
Memory Format	EEPROM	EEPROM
Memory Interface	Parallel	Parallel
Access Time	300 ns	200 ns
Write Cycle Time	3 ms	10 ms
Voltage Supply Range	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Package Type	32-PLCC (J-Lead)	32-PLCC (J-Lead)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The AT28BV64B-20JU is the qualified substitute for the AT28BV16-30JC based on the following factors:

Product Status: The substitute is classified as Active, ensuring continued availability and manufacturing support, whereas the main part is Obsolete.
Regulatory Compliance: The AT28BV64B-20JU is ROHS3 compliant, meeting current environmental and regulatory requirements. The original part is RoHS non-compliant.
Package and Interface Compatibility: Both parts share identical 32-PLCC packaging and parallel interface architecture, enabling direct PCB replacement without layout modifications.
Voltage Supply Compatibility: Both parts operate within the 2.7V to 3.6V range, ensuring power distribution compatibility.
Performance Characteristics: The substitute provides faster access time (200 ns versus 300 ns) and extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), offering improved performance margins.

Frequently Asked Questions (FAQ)

Q: Can the AT28BV64B-20JU be used as a direct replacement for the AT28BV16-30JC?

A: Yes. Both parts use the 32-PLCC package with identical pinout and parallel interface. The substitute can be soldered into existing PCB footprints without modification. The increased memory capacity does not prevent substitution in designs that do not require the full 64Kbit address space.

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

A: The AT28BV16-30JC provides 16Kbit (2K x 8 organization), while the AT28BV64B-20JU provides 64Kbit (8K x 8 organization). The substitute offers four times the storage capacity. Firmware or software must account for the additional address lines if the full capacity is to be utilized.

Q: Are the voltage supply requirements identical?

A: Yes. Both parts operate within the 2.7V to 3.6V supply range. Power supply circuits designed for the original part require no modification for the substitute.

Q: How do the access times compare?

A: The AT28BV64B-20JU has a 200 ns access time, which is faster than the AT28BV16-30JC at 300 ns. This represents improved performance and does not create compatibility issues in designs expecting the slower specification.

Q: What is the difference in write cycle time?

A: The AT28BV16-30JC has a 3 ms write cycle time, while the AT28BV64B-20JU has a 10 ms write cycle time. Applications performing frequent write operations must account for the longer cycle time in the substitute part.

Q: Does the substitute support the same operating temperature range?

A: The AT28BV64B-20JU supports -40°C to 85°C, which exceeds the original part's 0°C to 70°C range. The substitute is suitable for applications requiring extended temperature operation.

Q: What is the RoHS compliance status of each part?

A: The AT28BV16-30JC is RoHS non-compliant. The AT28BV64B-20JU is ROHS3 compliant, meeting current environmental regulations for new designs and production.

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