AT28C16-15JC Equivalent & Substitute Parts

Part Overview

The AT28C16-15JC is a 16Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 32-PLCC package with 150 ns access time. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part operates within a 4.5V to 5.5V supply voltage range and supports standard parallel memory interface protocols.

Key Parameters

Parameter	Value
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Format	EEPROM
Memory Interface	Parallel
Access Time	150 ns
Write Cycle Time	1 ms
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	32-PLCC (13.97x11.43)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT28C16-15JC is determined by the following critical parameters:

Package Compatibility: Both parts must use the 32-PLCC (13.97x11.43) package to ensure mechanical and electrical pin alignment on existing PCBs.
Memory Interface: Parallel interface requirement must be maintained for signal compatibility.
Supply Voltage: Operating voltage range of 4.5V to 5.5V must be supported.
Memory Organization: The substitute must support 2K x 8 organization or higher capacity with backward compatibility.
Product Status: Active product status is preferred to ensure long-term availability and support.

The AT28HC256-90JU qualifies as a substitute based on these parameters. It maintains the identical 32-PLCC package footprint, parallel interface architecture, and 4.5V to 5.5V supply voltage specification. The increased memory capacity (256Kbit vs. 16Kbit) and improved access time (90 ns vs. 150 ns) provide enhanced performance while maintaining full pin compatibility.

Parameter Comparison

Parameter	AT28C16-15JC (Main Part)	AT28HC256-90JU (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	16Kbit	256Kbit
Memory Organization	2K x 8	32K x 8
Memory Format	EEPROM	EEPROM
Memory Interface	Parallel	Parallel
Access Time	150 ns	90 ns
Write Cycle Time	1 ms	10 ms
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Package Type	32-PLCC (13.97x11.43)	32-PLCC (13.97x11.43)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The AT28HC256-90JU is the qualified substitute for the AT28C16-15JC based on the following engineering criteria:

Package and Pinout Compatibility: Both components utilize the identical 32-PLCC package with matching pin assignments, enabling direct PCB replacement without layout modifications.

Electrical Compatibility: The substitute maintains the same 4.5V to 5.5V supply voltage specification and parallel memory interface protocol, ensuring seamless integration into existing power distribution and signal routing architectures.

Product Status and Compliance: The AT28HC256-90JU holds active product status with Microchip Technology, providing assured long-term availability and manufacturing support. The part achieves ROHS3 compliance, meeting current environmental and regulatory standards, whereas the original AT28C16-15JC is non-compliant.

Performance Enhancement: The substitute delivers improved access time (90 ns versus 150 ns) and expanded memory capacity (256Kbit versus 16Kbit), providing performance headroom for system requirements while maintaining backward compatibility through identical interface protocols.

Frequently Asked Questions (FAQ)

Q: Can the AT28HC256-90JU be used as a direct replacement for the AT28C16-15JC on existing PCBs?

A: Yes. Both components share the identical 32-PLCC package footprint and pin configuration. The substitute can be soldered directly into existing board layouts without modification.

Q: What are the key differences between these two parts?

A: The primary differences are memory capacity (256Kbit versus 16Kbit), access time (90 ns versus 150 ns), operating temperature range (-40°C to 85°C versus 0°C to 70°C), and product status (active versus obsolete). The AT28HC256-90JU also achieves ROHS3 compliance.

Q: Are the supply voltage requirements identical?

A: Yes. Both parts operate within the 4.5V to 5.5V supply voltage range, requiring no changes to power supply design or voltage regulation circuits.

Q: Does the increased memory capacity of the substitute create compatibility issues?

A: No. The substitute maintains the same 2K x 8 memory organization at the base address space, ensuring full backward compatibility. The additional 240Kbit capacity is accessible through extended addressing without affecting existing firmware or software implementations.

Q: What is the significance of the RoHS compliance difference?

A: The AT28C16-15JC is RoHS non-compliant, while the AT28HC256-90JU achieves ROHS3 compliance. This distinction is critical for applications subject to environmental regulations or customer requirements mandating RoHS-compliant components.

Q: Are there any timing considerations when substituting these parts?

A: The substitute features faster access time (90 ns versus 150 ns), which improves system performance. The write cycle time increases from 1 ms to 10 ms; however, this does not affect compatibility as write operations are typically non-critical path timing elements in memory system design.

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