CAT28C64BGI12 Equivalent & Substitute Parts

Part Overview

The CAT28C64BGI12 is a 64Kbit parallel EEPROM memory IC manufactured by onsemi in a 32-PLCC package with 120 ns access time. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The CAT28C64BGI12 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 Format	EEPROM
Memory Interface	Parallel
Access Time	120 ns
Write Cycle Time	5 ms
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	32-PLCC (J-Lead)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the CAT28C64BGI12 is determined by strict equivalence in the following parameters:

Memory capacity: 64Kbit
Memory organization: 8K x 8
Memory format: EEPROM (non-volatile)
Interface type: Parallel
Package: 32-PLCC (J-Lead)
Supply voltage: 4.5V ~ 5.5V
Operating temperature range: -40°C ~ 85°C

Access time and write cycle time are secondary parameters that determine performance tier within the substitution group. Parts with equal or faster access times are functionally compatible. All substitute parts listed maintain identical memory capacity, organization, interface, and package specifications as the main part.

Parameter Comparison

Part Number	Manufacturer	Access Time (ns)	Write Cycle Time (ms)	Product Status	RoHS Status	Inventory
CAT28C64BGI12	onsemi	120	5	Obsolete	Not Specified	659 Pcs
AT28C64B-15JU	Microchip Technology	150	10	Active	ROHS3 Compliant	16704 Pcs
AT28C64B-15JU-T	Microchip Technology	150	10	Active	ROHS3 Compliant	3390 Pcs
AT28HC64B-12JU	Microchip Technology	120	10	Active	ROHS3 Compliant	1372 Pcs
AT28HC64B-70JU	Microchip Technology	70	10	Active	ROHS3 Compliant	1235 Pcs
AT28HC64B-90JU	Microchip Technology	90	10	Active	ROHS3 Compliant	1225 Pcs
AT28HC64BF-12JU	Microchip Technology	120	10	Active	ROHS3 Compliant	1000099 Pcs

Engineering Selection Recommendations

All listed substitute parts are manufactured by Microchip Technology and maintain active product status, ensuring long-term availability and supply chain stability. The AT28HC64B-12JU and AT28HC64BF-12JU offer direct performance equivalence to the CAT28C64BGI12 with 120 ns access time. The AT28HC64B-70JU and AT28HC64B-90JU provide faster access times for performance-critical applications. The AT28C64B series (150 ns access time) remains functionally compatible for timing-relaxed designs.

All substitute parts are ROHS3 compliant, addressing modern environmental and regulatory requirements. The CAT28C64BGI12, being obsolete, lacks current RoHS certification status. Selection should prioritize active-status parts with ROHS3 compliance for new designs and long-term production support.

Frequently Asked Questions (FAQ)

Q: Can AT28C64B-15JU replace CAT28C64BGI12 directly?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), interface (parallel), package (32-PLCC), and supply voltage (4.5V ~ 5.5V). The AT28C64B-15JU has a 150 ns access time versus 120 ns for the CAT28C64BGI12, making it suitable for applications with relaxed timing requirements.

Q: What is the performance difference between AT28HC64B-70JU and AT28HC64B-12JU?

A: Both parts are electrically equivalent with identical memory specifications and package. The AT28HC64B-70JU has 70 ns access time, while AT28HC64B-12JU has 120 ns access time. The 70 ns variant is faster and suitable for time-critical applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All Microchip Technology substitute parts listed are ROHS3 compliant. The original CAT28C64BGI12 does not specify RoHS status.

Q: Does packaging format affect substitution?

A: All substitute parts use the same 32-PLCC (J-Lead) package as the CAT28C64BGI12. Packaging variants (Tube, Cut Tape, Digi-Reel) affect procurement and handling but do not affect electrical or mechanical compatibility.

Q: Why is the write cycle time different between the main part and substitutes?

A: The CAT28C64BGI12 specifies 5 ms write cycle time, while all Microchip substitutes specify 10 ms. Both values are within acceptable EEPROM performance ranges. Applications with strict write timing requirements should be evaluated against actual system specifications.

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