AT28C64E-25JC Equivalent & Substitute Parts

Part Overview

The AT28C64E-25JC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 32-PLCC package with 250 ns access time. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The AT28C64E-25JC operates within the 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	250 ns
Write Cycle Time	200µs
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	32-PLCC (J-Lead)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT28C64E-25JC is determined by strict compatibility across core electrical and mechanical parameters. The following criteria establish valid substitution:

Critical Matching Parameters:

Memory capacity: 64Kbit
Memory organization: 8K x 8
Memory format: EEPROM (non-volatile)
Memory interface: Parallel
Package type: 32-PLCC (J-Lead)
Supply voltage range: 4.5V ~ 5.5V
Mounting type: Surface Mount

Performance Considerations: Access time and write cycle time may vary between substitute parts. Faster access times (lower nanosecond values) and improved write cycle times represent performance enhancements and do not restrict substitution compatibility. Operating temperature range may be extended in substitute parts without affecting backward compatibility.

The AT28C64B-15JU qualifies as a direct substitute, meeting all critical electrical and mechanical parameters while offering improved performance characteristics and active product status.

Parameter Comparison

Parameter	AT28C64E-25JC (Main Part)	AT28C64B-15JU (Substitute)
Memory Size	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8
Memory Format	EEPROM	EEPROM
Memory Interface	Parallel	Parallel
Access Time	250 ns	150 ns
Write Cycle Time	200µs	10ms
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Package Type	32-PLCC (J-Lead)	32-PLCC (J-Lead)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The AT28C64B-15JU is the qualified substitute for the AT28C64E-25JC based on the following engineering criteria:

Electrical Compatibility: Both parts maintain identical supply voltage range (4.5V ~ 5.5V), memory capacity (64Kbit), organization (8K x 8), and parallel interface architecture. Pin-to-pin compatibility is established through matching 32-PLCC package specifications.

Performance Enhancement: The AT28C64B-15JU provides faster access time (150 ns versus 250 ns), representing a performance improvement over the original part. The extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C) accommodates broader application environments.

Compliance Status: The AT28C64B-15JU holds active product status with ROHS3 compliance, whereas the AT28C64E-25JC is obsolete and RoHS non-compliant. This substitution aligns new designs with current regulatory requirements and ensures long-term component availability.

Programmability Verification: The AT28C64B-15JU is verified as programmable through DiGi-Electronics, supporting production programming workflows.

Frequently Asked Questions (FAQ)

Q: Can the AT28C64B-15JU directly replace the AT28C64E-25JC in existing designs?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), parallel interface, supply voltage range (4.5V ~ 5.5V), and 32-PLCC package specifications. Pin-to-pin compatibility is established. The AT28C64B-15JU offers improved access time and extended operating temperature range.

Q: What is the difference in access time between these parts?

A: The AT28C64E-25JC has 250 ns access time, while the AT28C64B-15JU has 150 ns access time. The faster access time of the substitute part does not create compatibility issues in applications designed for the original part.

Q: Are there compliance differences between the main part and substitute?

A: Yes. The AT28C64E-25JC is RoHS non-compliant and obsolete. The AT28C64B-15JU is ROHS3 compliant and maintains active product status, making it suitable for new production and designs requiring regulatory compliance.

Q: Does the extended temperature range of the AT28C64B-15JU affect substitution?

A: No. The AT28C64B-15JU operating range (-40°C ~ 85°C) encompasses the original part's range (0°C ~ 70°C). Extended temperature capability does not restrict substitution compatibility.

Q: What is the packaging difference between these parts?

A: Both parts use identical 32-PLCC (J-Lead) surface mount packaging with dimensions of 13.97x11.43 mm. No package modification is required for substitution.

Q: Is the AT28C64B-15JU programmable?

A: Yes. The AT28C64B-15JU is verified as programmable through DiGi-Electronics, supporting standard EEPROM programming procedures.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message