AT28C64X-20SC EEPROM Equivalent & Substitute Parts

Part Overview

The AT28C64X-20SC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology in a 28-SOIC package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part operates with a 200 ns access time and supports standard 4.5V to 5.5V supply voltage across a 0°C to 70°C operating temperature range.

Key Parameters

Parameter	Value
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Format	EEPROM
Memory Interface	Parallel
Access Time	200 ns
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	28-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AT28C64X-20SC is determined by the following critical parameters:

Memory capacity: 64Kbit (8K x 8 organization)
Interface type: Parallel
Package: 28-SOIC form factor
Supply voltage compatibility: 4.5V ~ 5.5V
Access time: Equal to or faster than 200 ns

Three substitute parts meet these core electrical and mechanical requirements. The AT28C64B-15SU from Microchip Technology provides a direct manufacturer upgrade path with improved access time (150 ns) and extended temperature range. The Renesas Electronics X28HC64 series (X28HC64SIZ-12, X28HC64SIZ-12T1, X28HC64SZ-12) offers faster access times (120 ns) with packaging variations to support different supply chain requirements.

Parameter Comparison

Parameter	AT28C64X-20SC	AT28C64B-15SU	X28HC64SIZ-12	X28HC64SIZ-12T1	X28HC64SZ-12
Manufacturer	Microchip Technology	Microchip Technology	Renesas Electronics	Renesas Electronics	Renesas Electronics
Memory Size	64Kbit	64Kbit	64Kbit	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8	8K x 8	8K x 8	8K x 8
Access Time	200 ns	150 ns	120 ns	120 ns	120 ns
Write Cycle Time	1 ms	10 ms	5 ms	5 ms	5 ms
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C
Package / Case	28-SOIC	28-SOIC	28-SOIC	28-SOIC	28-SOIC
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Option	Not specified	Tube	Not specified	Tape & Reel	Tube

Engineering Selection Recommendations

All substitute parts are electrically compatible with the AT28C64X-20SC based on memory capacity, organization, interface type, and supply voltage specifications. All substitute parts are currently in active product status, ensuring long-term availability and supply chain stability.

The AT28C64B-15SU provides the most direct replacement path as a Microchip Technology product with ROHS3 compliance and extended operating temperature range (-40°C to 85°C). This part offers improved access time performance while maintaining the same supply voltage requirements.

The Renesas Electronics X28HC64 series offers superior access time performance (120 ns versus 200 ns) with ROHS3 compliance. X28HC64SIZ-12T1 is packaged in Tape & Reel format for high-volume manufacturing. X28HC64SZ-12 maintains the original 0°C to 70°C operating temperature range and is available in Tube packaging. X28HC64SIZ-12 is available without specified packaging constraints.

All substitute parts meet the 28-SOIC package requirement and surface mount mounting type of the original device.

Frequently Asked Questions (FAQ)

Q: Can the AT28C64B-15SU directly replace the AT28C64X-20SC in existing designs?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), parallel interface, 28-SOIC package, and 4.5V to 5.5V supply voltage requirements. The AT28C64B-15SU offers faster access time (150 ns) and extended temperature range, making it a compatible upgrade.

Q: What is the primary difference between the Microchip and Renesas substitute options?

A: The AT28C64B-15SU is a Microchip product with 150 ns access time. The Renesas X28HC64 series offers faster 120 ns access time. Both manufacturers' parts are ROHS3 compliant and in active production status.

Q: Are there temperature range considerations when selecting a substitute?

A: The original AT28C64X-20SC operates from 0°C to 70°C. The AT28C64B-15SU and most Renesas parts extend this to -40°C to 85°C. The X28HC64SZ-12 maintains the 0°C to 70°C range. Select based on your application's thermal requirements.

Q: What packaging options are available for the substitute parts?

A: AT28C64B-15SU is supplied in Tube packaging. X28HC64SIZ-12T1 is supplied in Tape & Reel format for automated assembly. X28HC64SZ-12 is supplied in Tube packaging. X28HC64SIZ-12 packaging is not specified. Confirm packaging requirements with your procurement process.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant. The original AT28C64X-20SC is RoHS non-compliant due to its obsolete status.

Q: Do the substitute parts have different write cycle times?

A: Yes. The AT28C64X-20SC has a 1 ms write cycle time. The AT28C64B-15SU has a 10 ms write cycle time. The Renesas X28HC64 series has a 5 ms write cycle time. Verify write cycle time compatibility with your application timing requirements.

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