AT28C17-15PC Equivalent & Substitute Parts

Part Overview

The AT28C17-15PC is a 16Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-PDIP package with 150 ns access time. This component is classified as obsolete, making equivalent or substitute parts necessary for new designs, production continuity, or system upgrades. The part operates within a 4.5V to 5.5V supply voltage range and supports 0°C to 70°C operating temperatures, typical for industrial and commercial applications requiring non-volatile parallel memory storage.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Interface	Parallel
Access Time	150 ns
Write Cycle Time	1 ms
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	28-DIP (0.600", 15.24mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AT28C17-15PC is based on the following critical parameters:

Package Compatibility: Both parts must use 28-DIP (0.600", 15.24mm) through-hole packaging to ensure direct PCB compatibility without layout modifications.
Memory Interface: Parallel interface requirement ensures pin-level compatibility and eliminates the need for protocol conversion circuitry.
Voltage Supply Range: Both parts must operate within 4.5V to 5.5V to maintain compatibility with existing power distribution systems.
Access Time: 150 ns access time is maintained across substitute parts to preserve system timing specifications.
Non-Volatile EEPROM Technology: Both parts utilize EEPROM technology for equivalent data retention and electrical erasure capabilities.

The AT28C64B-15PU qualifies as a substitute based on these parameters. While it offers increased memory capacity (64Kbit vs. 16Kbit), it maintains identical package geometry, parallel interface, voltage specifications, and access time performance.

Parameter Comparison

Parameter	AT28C17-15PC (Main Part)	AT28C64B-15PU (Substitute)
Memory Type	Non-Volatile EEPROM	Non-Volatile EEPROM
Memory Size	16Kbit	64Kbit
Memory Organization	2K x 8	8K x 8
Memory Interface	Parallel	Parallel
Access Time	150 ns	150 ns
Write Cycle Time	1 ms	10 ms
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Package Type	28-DIP (0.600", 15.24mm)	28-DIP (0.600", 15.24mm)
Mounting Type	Through Hole	Through Hole
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The AT28C64B-15PU is suitable as a substitute for the AT28C17-15PC based on the following factors:

Product Status: The AT28C64B-15PU maintains active product status with verified programmability, ensuring ongoing availability and manufacturer support compared to the obsolete AT28C17-15PC.
Regulatory Compliance: The AT28C64B-15PU is ROHS3 compliant, meeting current environmental and regulatory requirements, whereas the AT28C17-15PC is non-compliant.
Package and Interface Compatibility: Identical 28-DIP package and parallel interface enable direct substitution without PCB redesign or firmware modification.
Electrical Specifications: Matching voltage supply range (4.5V ~ 5.5V) and access time (150 ns) preserve system timing and power distribution compatibility.
Extended Temperature Range: The AT28C64B-15PU supports -40°C to 85°C operation, providing broader environmental tolerance than the original part's 0°C to 70°C range.

Frequently Asked Questions (FAQ)

Q: Can the AT28C64B-15PU be used as a direct replacement for the AT28C17-15PC without PCB modifications?

A: Yes. Both parts use identical 28-DIP (0.600", 15.24mm) through-hole packaging and parallel interface pinouts, enabling direct socket substitution without layout changes.

Q: What is the primary difference between these two parts?

A: The AT28C64B-15PU provides 64Kbit memory capacity (8K x 8 organization) compared to the AT28C17-15PC's 16Kbit capacity (2K x 8 organization). Both maintain 150 ns access time and identical voltage specifications.

Q: Will the increased write cycle time of the AT28C64B-15PU (10 ms vs. 1 ms) affect system performance?

A: Write cycle time affects only the duration of individual write operations. If the original design does not depend on the 1 ms write cycle time for critical timing, the 10 ms specification will not impact system functionality.

Q: Is the AT28C64B-15PU compatible with systems designed for 0°C to 70°C operation?

A: Yes. The AT28C64B-15PU's -40°C to 85°C operating range encompasses the original part's 0°C to 70°C specification, ensuring full compatibility within the original temperature envelope.

Q: What are the compliance advantages of the AT28C64B-15PU?

A: The AT28C64B-15PU is ROHS3 compliant and maintains active product status, whereas the AT28C17-15PC is obsolete and RoHS non-compliant. This ensures regulatory alignment and long-term supply availability.

Q: Are there any address line differences between these parts?

A: The AT28C64B-15PU requires one additional address line (A13) to access the expanded 64Kbit memory space compared to the AT28C17-15PC. System designs must accommodate this additional address line for proper operation.

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