AT28C64E-15PC Equivalent & Substitute Parts

Part Overview

The AT28C64E-15PC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-DIP package with 150 ns access time. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part operates within a 4.5V to 5.5V supply voltage range and supports 8K x 8 memory organization with parallel interface architecture.

Key Parameters

Parameter	Value
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Format	EEPROM
Memory Interface	Parallel
Access Time	150 ns
Voltage Supply Range	4.5V ~ 5.5V
Package Type	28-DIP (0.600", 15.24mm)
Mounting Type	Through Hole
Operating Temperature	0°C ~ 70°C

Substitute Part Grouping Explanation

Substitution for the AT28C64E-15PC is determined by strict equivalence across the following critical parameters:

Memory capacity: 64Kbit
Memory organization: 8K x 8
Interface type: Parallel
Package format: 28-DIP
Supply voltage compatibility: 4.5V ~ 5.5V
Access time: Equal to or faster than 150 ns

The two qualified substitute parts meet these criteria while offering improvements in product status and compliance certifications. Substitution is valid when the replacement part maintains or exceeds performance specifications and physical compatibility.

Parameter Comparison

Parameter	AT28C64E-15PC	AT28C64B-15PU	X28HC64PZ-12
Manufacturer	Microchip Technology	Microchip Technology	Renesas Electronics Corporation
Memory Size	64Kbit	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8	8K x 8
Memory Format	EEPROM	EEPROM	EEPROM
Memory Interface	Parallel	Parallel	Parallel
Access Time	150 ns	150 ns	120 ns
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Write Cycle Time	200µs	10ms	5ms
Package / Case	28-DIP (0.600", 15.24mm)	28-DIP (0.600", 15.24mm)	28-DIP (0.600", 15.24mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both substitute parts are functionally equivalent to the AT28C64E-15PC and maintain full compatibility with existing 28-DIP through-hole socket implementations.

AT28C64B-15PU is the manufacturer-recommended substitute from Microchip Technology. It provides identical access time (150 ns) and maintains the same memory organization. This part offers an extended operating temperature range (-40°C to 85°C) compared to the original specification and achieves ROHS3 compliance. The part is actively produced and verified as programmable.

X28HC64PZ-12 is manufactured by Renesas Electronics Corporation and provides superior access time performance at 120 ns, exceeding the original 150 ns specification. This part also achieves ROHS3 compliance and operates within the original temperature range (0°C to 70°C). The faster access time makes this part suitable for timing-critical applications.

Selection between substitute parts depends on supply chain availability, temperature range requirements, and access time performance needs. Both parts are actively produced and available in stock quantities.

Frequently Asked Questions (FAQ)

Q: Can AT28C64B-15PU directly replace AT28C64E-15PC in existing designs?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), parallel interface, 28-DIP package dimensions, and supply voltage range (4.5V ~ 5.5V). Physical and electrical compatibility is maintained. The substitute offers extended temperature range and improved compliance status.

Q: What is the difference between AT28C64B-15PU and X28HC64PZ-12?

A: Both are functionally equivalent 64Kbit parallel EEPROMs in 28-DIP packages. The primary differences are manufacturer (Microchip vs. Renesas), access time (150 ns vs. 120 ns), and write cycle time (10ms vs. 5ms). The X28HC64PZ-12 provides faster performance characteristics.

Q: Are all three parts compatible with the same PCB footprint?

A: Yes. All three parts use the 28-DIP package format with 0.600" (15.24mm) body width and through-hole mounting. PCB footprints and socket compatibility are identical.

Q: Does the operating temperature range affect substitution compatibility?

A: Operating temperature range does not prevent substitution. The AT28C64B-15PU offers an extended range (-40°C to 85°C) compared to the original (0°C to 70°C), making it suitable for a broader range of applications. The X28HC64PZ-12 maintains the original temperature specification (0°C to 70°C).

Q: What compliance certifications apply to substitute parts?

A: Both AT28C64B-15PU and X28HC64PZ-12 are ROHS3 compliant. The original AT28C64E-15PC is RoHS non-compliant. Both substitutes are REACH unaffected and classified under ECCN EAR99.

Q: Are substitute parts available in the same packaging options?

A: AT28C64B-15PU is supplied in tube packaging. X28HC64PZ-12 is also supplied in tube packaging. Both parts maintain compatibility with standard component handling and assembly processes.

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