AT28C64E-20PC Equivalent & Substitute Parts

Part Overview

The AT28C64E-20PC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-DIP package. This device features a 200 ns access time and operates across a 4.5V to 5.5V supply voltage range with an operating temperature range of 0°C to 70°C. The AT28C64E-20PC is classified as obsolete, making identification of functionally compatible substitute parts essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Format	EEPROM
Memory Interface	Parallel
Access Time	200 ns
Write Cycle Time	200 µs
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

Substitute Part Grouping Explanation

Substitute parts for the AT28C64E-20PC must satisfy the following core substitution criteria:

Mandatory Compatibility Parameters:

Memory Size: 64Kbit
Memory Organization: 8K x 8
Memory Format: EEPROM
Memory Interface: Parallel
Package Type: 28-DIP (0.600", 15.24mm)
Voltage Supply Range: 4.5V ~ 5.5V (compatible overlap required)

Performance Parameters (Allowable Variation):

Access Time: Equal to or faster than 200 ns
Write Cycle Time: Equal to or faster than 200 µs

The identified substitute parts meet all mandatory compatibility requirements. Both alternatives provide equal or improved performance characteristics while maintaining electrical and mechanical interchangeability.

Parameter Comparison

Parameter	AT28C64E-20PC (Main)	AT28C64B-15PU (Substitute)	X28HC64PZ-12 (Substitute)
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	200 ns	150 ns	120 ns
Write Cycle Time	200 µs	10 ms	5 ms
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C
Package Type	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
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AT28C64B-15PU (Microchip Technology): This part maintains manufacturer continuity within the Microchip Technology product line and is classified as active with verified programmability. It provides faster access time (150 ns) compared to the original specification. The extended operating temperature range (-40°C to 85°C) accommodates broader environmental conditions. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) support modern manufacturing and storage requirements.

X28HC64PZ-12 (Renesas Electronics Corporation): This alternative offers the fastest access time (120 ns) among available substitutes and is classified as active. It maintains full electrical and mechanical compatibility with the original package specification. ROHS3 compliance is provided, though the moisture sensitivity level (MSL 3, 168 hours) requires controlled storage conditions. The operating temperature range matches the original specification (0°C to 70°C).

Both substitute parts are electrically and mechanically interchangeable with the AT28C64E-20PC and are available in active production status with current inventory.

Frequently Asked Questions (FAQ)

Q: Can the AT28C64B-15PU directly replace the AT28C64E-20PC?

A: Yes. Both devices share identical memory capacity (64Kbit), organization (8K x 8), parallel interface, supply voltage range (4.5V ~ 5.5V), and 28-DIP package configuration. The AT28C64B-15PU provides improved access time (150 ns versus 200 ns) and extended operating temperature range (-40°C to 85°C versus 0°C to 70°C).

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

A: The AT28C64B-15PU is manufactured by Microchip Technology and offers an extended operating temperature range (-40°C to 85°C). The X28HC64PZ-12 is manufactured by Renesas Electronics Corporation and provides faster access time (120 ns). Both maintain full compatibility with the original AT28C64E-20PC pinout and electrical specifications.

Q: Are there any packaging or mounting differences?

A: No. All three parts use identical 28-DIP (0.600", 15.24mm) through-hole packaging. Direct socket substitution is supported without PCB modifications.

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

A: The AT28C64E-20PC is RoHS non-compliant, while both substitute parts (AT28C64B-15PU and X28HC64PZ-12) are ROHS3 compliant. This compliance status is relevant for new designs and systems subject to RoHS regulations.

Q: Does the moisture sensitivity level (MSL) affect component handling?

A: The AT28C64B-15PU has MSL 1 (unlimited), requiring no special moisture control during storage or handling. The X28HC64PZ-12 has MSL 3 (168 hours), requiring controlled storage conditions and bake-out procedures if moisture absorption limits are exceeded.

Q: Are both substitute parts currently available?

A: Yes. Both the AT28C64B-15PU and X28HC64PZ-12 are classified as active products with current inventory availability.

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