AT28C64E-12PI EEPROM Equivalent & Substitute Parts

Part Overview

The AT28C64E-12PI is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-DIP package with 120 ns access time. This part is classified as obsolete, making substitute components necessary for new designs and production continuity. The device operates across the industrial temperature range of -40°C to 85°C with a 4.5V to 5.5V supply voltage, serving applications requiring non-volatile parallel memory storage.

Key Parameters

Parameter	Value
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	Parallel
Access Time	120 ns
Write Cycle Time	200 µs
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	28-DIP (0.600", 15.24mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the AT28C64E-12PI is determined by strict equivalence in the following parameters: memory capacity (64Kbit), memory organization (8K x 8), parallel interface architecture, package form factor (28-DIP), and supply voltage compatibility (4.5V ~ 5.5V). Access time and write cycle time are secondary selection criteria when multiple substitutes meet primary requirements. The identified substitutes maintain full functional compatibility within these electrical and mechanical constraints.

Parameter Comparison

Parameter	AT28C64E-12PI	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 Interface	Parallel	Parallel	Parallel
Access Time	120 ns	150 ns	120 ns
Write Cycle Time	200 µs	10 ms	5 ms
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C
Package Type	28-DIP	28-DIP	28-DIP
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both AT28C64B-15PU and X28HC64PZ-12 serve as functional substitutes for the AT28C64E-12PI. The AT28C64B-15PU, manufactured by Microchip Technology, maintains identical supply voltage and operating temperature specifications while introducing a 30 ns access time penalty and extended write cycle time of 10 ms. This part achieves ROHS3 compliance and carries active product status with verified programmability.

The X28HC64PZ-12 from Renesas Electronics Corporation matches the original 120 ns access time specification and reduces write cycle time to 5 ms. However, this substitute operates within a narrower temperature range (0°C ~ 70°C) compared to the original industrial specification (-40°C ~ 85°C), limiting applicability to commercial temperature environments. This part also achieves ROHS3 compliance and maintains active product status.

Selection between substitutes depends on application temperature requirements and write cycle performance needs. Applications requiring the full industrial temperature range must use AT28C64B-15PU. Applications operating within commercial temperature limits may select X28HC64PZ-12 for improved write performance.

Frequently Asked Questions (FAQ)

Q: Can AT28C64B-15PU directly replace AT28C64E-12PI in all applications?

A: AT28C64B-15PU provides functional substitution for applications operating within -40°C to 85°C. The 30 ns increase in access time (150 ns vs. 120 ns) and extended write cycle time (10 ms vs. 200 µs) must be evaluated against system timing requirements. Electrical compatibility is maintained across the 4.5V to 5.5V supply range.

Q: What is the temperature limitation of X28HC64PZ-12?

A: X28HC64PZ-12 operates within 0°C to 70°C, restricting use to commercial temperature environments. The original AT28C64E-12PI supports -40°C to 85°C industrial range. Applications requiring operation below 0°C or above 70°C must use AT28C64B-15PU.

Q: Are both substitutes pin-compatible with the original part?

A: Both AT28C64B-15PU and X28HC64PZ-12 use 28-DIP packaging with identical 0.600" (15.24mm) spacing, providing mechanical and electrical pin compatibility for through-hole mounting.

Q: What is the significance of RoHS compliance for these parts?

A: AT28C64E-12PI is RoHS non-compliant. Both substitutes (AT28C64B-15PU and X28HC64PZ-12) achieve ROHS3 compliance, meeting environmental and regulatory requirements for new designs and production.

Q: How do write cycle times affect system performance?

A: Write cycle time determines the duration required to complete a single write operation. AT28C64E-12PI specifies 200 µs, AT28C64B-15PU specifies 10 ms, and X28HC64PZ-12 specifies 5 ms. Applications with frequent write operations must account for these timing differences in system design.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes, both substitutes maintain identical 28-DIP package dimensions and pin assignments, allowing direct PCB substitution without layout modifications. System timing analysis is required to confirm compatibility with access time and write cycle time specifications.

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