Request Quote
(Ships tomorrow)
AT28HC64B-12SC EEPROM Memory IC Equivalent & Substitute Parts
Part Overview
The AT28HC64B-12SC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology in a 28-SOIC package. This component is classified as obsolete, indicating it has been discontinued by the manufacturer. The part operates with a 120 ns access time and supports parallel memory interface architecture with 8K x 8 memory organization. Due to its obsolete status, identifying compatible substitute parts is essential for system maintenance, legacy equipment repair, and design continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Memory Size | 64Kbit |
| Memory Organization | 8K x 8 |
| Memory Interface | Parallel |
| Access Time | 120 ns |
| Write Cycle Time | 10ms |
| Voltage Supply Range | 4.5V ~ 5.5V |
| Package Type | 28-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| Memory Type | Non-Volatile EEPROM |
Substitute Part Grouping Explanation
Substitution for the AT28HC64B-12SC is determined by strict equivalence across the following critical parameters:
- Memory capacity: 64Kbit
- Memory organization: 8K x 8 configuration
- Interface type: Parallel architecture
- Access time: 120 ns maximum
- Write cycle time: 10ms
- Supply voltage range: 4.5V ~ 5.5V
- Package: 28-SOIC form factor
- Mounting: Surface mount technology
The AT28HC64B-12SU qualifies as a direct substitute based on identical electrical specifications and package configuration. The primary distinction lies in product status and operating temperature range, which do not affect functional interchangeability in applications designed for the original part.
Parameter Comparison
| Parameter | AT28HC64B-12SC (Main Part) | AT28HC64B-12SU (Substitute) |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Memory Size | 64Kbit | 64Kbit |
| Memory Organization | 8K x 8 | 8K x 8 |
| Memory Interface | Parallel | Parallel |
| Access Time | 120 ns | 120 ns |
| Write Cycle Time | 10ms | 10ms |
| Voltage Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C | -40°C ~ 85°C |
| Package / Case | 28-SOIC (0.295", 7.50mm Width) | 28-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount | Surface Mount |
| Product Status | Obsolete | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| Packaging | Not specified | Tube |
Engineering Selection Recommendations
The AT28HC64B-12SU is a direct functional equivalent to the AT28HC64B-12SC. Both parts share identical memory capacity, organization, interface architecture, access time, and supply voltage specifications. The substitute part offers the following advantages:
- Active product status ensures continued availability and manufacturer support
- Extended operating temperature range (-40°C ~ 85°C) provides broader environmental compatibility compared to the original part (0°C ~ 70°C)
- ROHS3 compliance meets current regulatory requirements, whereas the original part is RoHS non-compliant
- Tube packaging format supports standard component handling and assembly processes
Selection of the AT28HC64B-12SU is appropriate for applications requiring the electrical and mechanical characteristics of the AT28HC64B-12SC, particularly in environments where regulatory compliance and extended temperature operation are required.
Frequently Asked Questions (FAQ)
Q: Can the AT28HC64B-12SU replace the AT28HC64B-12SC in existing designs?
A: Yes. Both parts are electrically and mechanically equivalent. They share identical memory specifications, access time, write cycle time, supply voltage range, and 28-SOIC package configuration. Direct substitution is possible without circuit modification.
Q: What is the difference in operating temperature range between these parts?
A: The AT28HC64B-12SC operates from 0°C to 70°C, while the AT28HC64B-12SU operates from -40°C to 85°C. The substitute part supports a wider temperature range, making it suitable for applications requiring extended environmental operation.
Q: Does the RoHS compliance difference affect compatibility?
A: RoHS compliance status does not affect electrical or mechanical compatibility. The AT28HC64B-12SU meets ROHS3 requirements, which is advantageous for applications subject to regulatory compliance mandates. The original part is RoHS non-compliant.
Q: Are the package dimensions identical?
A: Yes. Both parts use the 28-SOIC package with identical dimensions of 0.295" × 7.50mm width. PCB footprints and mounting requirements are identical.
Q: What is the significance of the product status difference?
A: The AT28HC64B-12SC is obsolete, meaning it is no longer manufactured. The AT28HC64B-12SU is active, ensuring ongoing availability, manufacturer support, and continued production. For new designs or system maintenance requiring long-term component availability, the active substitute is the appropriate choice.
Q: Are there any programming or configuration differences?
A: No. Both parts are EEPROM memory ICs with parallel interface architecture. Programming methodology and memory access protocols are identical.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts