AT28C64B-15SC EEPROM Equivalent & Substitute Parts

Part Overview

The AT28C64B-15SC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology in 28-SOIC packaging. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production requirements. The AT28C64B-15SC operates with a 150 ns access time and 10ms write cycle time, serving applications requiring non-volatile parallel memory storage within the 4.5V to 5.5V supply range.

Key Parameters

Parameter	Value
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Format	EEPROM
Memory Interface	Parallel
Access Time	150 ns
Write Cycle Time	10ms
Voltage Supply	4.5V – 5.5V
Package Type	28-SOIC
Mounting Type	Surface Mount
Operating Temperature	0°C – 70°C

Substitute Part Grouping Explanation

Substitution of the AT28C64B-15SC is determined by strict equivalence in the following parameters:

Memory capacity: 64Kbit
Memory organization: 8K x 8
Memory format: EEPROM
Interface type: Parallel
Package: 28-SOIC
Supply voltage: 4.5V – 5.5V

Substitute parts must maintain identical memory specifications and package footprint to ensure direct replacement capability. Access time and write cycle time variations are permitted when the substitute part meets or exceeds the performance of the original part. Operating temperature range may differ based on application requirements and product status availability.

Parameter Comparison

Parameter	AT28C64B-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
Access Time	150 ns	150 ns	120 ns	120 ns	120 ns
Write Cycle Time	10ms	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
Package	28-SOIC	28-SOIC	28-SOIC	28-SOIC	28-SOIC
Operating Temperature	0°C – 70°C	-40°C – 85°C	-40°C – 85°C	-40°C – 85°C	0°C – 70°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Bulk	Tube	Bulk	Tape & Reel	Tube

Engineering Selection Recommendations

Primary Substitute: AT28C64B-15SU

The AT28C64B-15SU is the direct equivalent from Microchip Technology with active product status. This part maintains identical electrical specifications and 28-SOIC packaging. The AT28C64B-15SU offers extended operating temperature range (-40°C to 85°C) and ROHS3 compliance, making it suitable for applications requiring regulatory adherence. Inventory availability is significantly higher (17,844 pcs) compared to the obsolete AT28C64B-15SC.

Secondary Substitutes: X28HC64SIZ-12, X28HC64SIZ-12T1, X28HC64SZ-12

The Renesas Electronics X28HC64 series provides enhanced performance characteristics with 120 ns access time and 5ms write cycle time, both superior to the original part. All three variants maintain 64Kbit capacity, 8K x 8 organization, parallel interface, and 28-SOIC packaging. These parts are ROHS3 compliant and actively produced.

X28HC64SIZ-12: Bulk packaging, -40°C to 85°C operating range
X28HC64SIZ-12T1: Tape & Reel packaging, -40°C to 85°C operating range
X28HC64SZ-12: Tube packaging, 0°C to 70°C operating range

Selection between Renesas variants depends on packaging requirements and temperature range specifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can the AT28C64B-15SU directly replace the AT28C64B-15SC?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), interface (parallel), supply voltage (4.5V – 5.5V), and 28-SOIC package. The AT28C64B-15SU is the active production equivalent with improved compliance status.

Q: What are the performance differences between Microchip and Renesas substitutes?

A: The Renesas X28HC64 series offers faster access time (120 ns versus 150 ns) and shorter write cycle time (5ms versus 10ms). These improvements provide performance headroom for timing-critical applications while maintaining full electrical and mechanical compatibility.

Q: Are all substitute parts RoHS compliant?

A: The AT28C64B-15SU and all Renesas X28HC64 variants are ROHS3 compliant. The original AT28C64B-15SC is RoHS non-compliant. Compliance status should be verified against specific regulatory requirements for your application.

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

A: AT28C64B-15SU is supplied in Tube packaging. Renesas X28HC64 variants are available in Bulk (X28HC64SIZ-12), Tape & Reel (X28HC64SIZ-12T1), and Tube (X28HC64SZ-12) packaging options.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not affect electrical or mechanical compatibility. Selection should be based on the thermal requirements of your application. The AT28C64B-15SU and X28HC64SIZ-12/12T1 support -40°C to 85°C, while X28HC64SZ-12 supports 0°C to 70°C.

Q: Can I use X28HC64SZ-12 if my application requires -40°C operation?

A: No. The X28HC64SZ-12 is rated for 0°C to 70°C operation only. For applications requiring -40°C operation, use AT28C64B-15SU, X28HC64SIZ-12, or X28HC64SIZ-12T1.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message