| PartNumber | AT45DB021B-SI | AT45DB021B-SC | AT45DB021B-SU |
| Description | NOR Flash 2M bit | NOR Flash 2M SERIAL 2.7V - 8 COM TEMP | IC FLASH 2M SPI 20MHZ 8SOIC |
| Manufacturer | Microchip | Microchip | - |
| Product Category | NOR Flash | NOR Flash | - |
| RoHS | N | N | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | SOIC-8 | SOIC-28 | - |
| Series | AT45DB | AT45DB | - |
| Memory Size | 2 Mbit | 2 Mbit | - |
| Maximum Clock Frequency | 20 MHz | 20 MHz | - |
| Interface Type | SPI | SPI | - |
| Organization | 256 k x 8 | 256 k x 8 | - |
| Timing Type | Synchronous | Synchronous | - |
| Data Bus Width | 8 bit | 8 bit | - |
| Supply Voltage Min | 2.7 V | 2.7 V | - |
| Supply Voltage Max | 3.6 V | 3.6 V | - |
| Supply Current Max | 10 mA | 10 mA | - |
| Minimum Operating Temperature | - 40 C | 0 C | - |
| Maximum Operating Temperature | + 85 C | + 70 C | - |
| Memory Type | NOR | NOR | - |
| Speed | 20 MHz | 20 MHz | - |
| Architecture | Sector | Sector | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | - |
| Product Type | NOR Flash | NOR Flash | - |
| Standard | Not Supported | Not Supported | - |
| Factory Pack Quantity | 95 | 95 | - |
| Subcategory | Memory & Data Storage | Memory & Data Storage | - |
| Unit Weight | 0.019048 oz | 0.078125 oz | - |