AT28C64E-15SC EEPROM Equivalent & Substitute Parts

Part Overview

The AT28C64E-15SC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology in a 28-SOIC package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The AT28C64E-15SC operates with a 150 ns access time and 200µs write cycle time across a 4.5V to 5.5V supply range, serving applications requiring non-volatile parallel memory storage in legacy and industrial systems.

Key Parameters

Parameter	Value
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	Parallel
Access Time	150 ns
Write Cycle Time	200µs
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package	28-SOIC
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AT28C64E-15SC is determined by strict equivalence in the following parameters: 64Kbit memory capacity, 8K x 8 organization, parallel interface, 28-SOIC package, and surface mount technology. All substitute parts maintain identical supply voltage range (4.5V ~ 5.5V) and package dimensions.

The substitute parts are grouped into two categories based on access time performance:

Category 1: Direct Functional Equivalents (150 ns Access Time)

AT28C64B-15SU: Microchip Technology active product with extended temperature range and improved write cycle time

Category 2: Performance-Enhanced Equivalents (120 ns Access Time)

X28HC64SIZ-12: Renesas Electronics Corporation, standard packaging
X28HC64SIZ-12T1: Renesas Electronics Corporation, tape & reel packaging
X28HC64SZ-12: Renesas Electronics Corporation, tube packaging

All substitute parts maintain the same memory capacity, organization, interface type, and package form factor as the original AT28C64E-15SC.

Parameter Comparison

Parameter	AT28C64E-15SC	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
Memory Interface	Parallel	Parallel	Parallel	Parallel	Parallel
Access Time	150 ns	150 ns	120 ns	120 ns	120 ns
Write Cycle Time	200µs	10ms	5ms	5ms	5ms
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	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

Engineering Selection Recommendations

For Direct Replacement with Minimal Design Changes: Select AT28C64B-15SU when maintaining the original 150 ns access time specification is required. This Microchip Technology part is active and ROHS3 compliant, offering extended operating temperature range (-40°C to 85°C) compared to the obsolete AT28C64E-15SC. The extended temperature capability provides improved reliability in industrial applications.

For Performance-Enhanced Applications: The Renesas Electronics X28HC64 series (X28HC64SIZ-12, X28HC64SIZ-12T1, X28HC64SZ-12) offers 120 ns access time, providing 20% faster memory access than the original part. These parts are active products with ROHS3 compliance. Selection between variants depends on packaging requirements: standard packaging (X28HC64SIZ-12), tape & reel for automated assembly (X28HC64SIZ-12T1), or tube packaging (X28HC64SZ-12). The X28HC64SZ-12 maintains the original 0°C to 70°C temperature range, while X28HC64SIZ-12 and X28HC64SIZ-12T1 extend to -40°C to 85°C.

All substitute parts maintain identical electrical interface compatibility and 28-SOIC package dimensions, enabling direct PCB-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can AT28C64B-15SU be used as a direct replacement for AT28C64E-15SC? A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), access time (150 ns), supply voltage (4.5V ~ 5.5V), and 28-SOIC package. The AT28C64B-15SU is an active product with extended temperature range and improved write cycle time, making it a suitable direct replacement.

Q: What is the primary difference between Microchip AT28C64B-15SU and Renesas X28HC64 series? A: The Renesas X28HC64 series provides faster access time (120 ns versus 150 ns) and faster write cycle time (5ms versus 10ms). Both meet the same supply voltage and package requirements. Selection depends on whether the faster performance is beneficial for the application.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts (AT28C64B-15SU, X28HC64SIZ-12, X28HC64SIZ-12T1, X28HC64SZ-12) are ROHS3 compliant, whereas the original AT28C64E-15SC is RoHS non-compliant.

Q: What is the difference between X28HC64SIZ-12, X28HC64SIZ-12T1, and X28HC64SZ-12? A: These three parts are electrically identical with 120 ns access time and 5ms write cycle time. The differences are packaging format: X28HC64SIZ-12 is standard packaging, X28HC64SIZ-12T1 is tape & reel for automated pick-and-place assembly, and X28HC64SZ-12 is tube packaging. Operating temperature for X28HC64SZ-12 is 0°C to 70°C, while the other two extend to -40°C to 85°C.

Q: Can I use X28HC64SZ-12 in applications requiring -40°C operation? A: No. X28HC64SZ-12 operates from 0°C to 70°C. For extended low-temperature operation, use X28HC64SIZ-12 or X28HC64SIZ-12T1, which operate from -40°C to 85°C.

Q: Is the 28-SOIC package identical across all parts? A: Yes. All parts use 28-SOIC (0.295", 7.50mm width) package with identical pin configuration and dimensions, enabling direct PCB substitution.

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