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| PartNumber | M29F040B55N1 | M29F040B-55K1 | M29F040B55NI |
| Description | NOR Flash 4M (512Kx8) 55ns | NOR Flash, 512K x 8, 32 Pin, Plastic, PLCC | |
| Manufacturer | STMicroelectronics | - | - |
| Product Category | NOR Flash | - | - |
| RoHS | N | - | - |
| Mounting Style | SMD/SMT | - | - |
| Package / Case | TSOP-32 | - | - |
| Series | M29F | - | - |
| Memory Size | 4 Mbit | - | - |
| Interface Type | Parallel | - | - |
| Organization | 512 k x 8 | - | - |
| Timing Type | Asynchronous | - | - |
| Data Bus Width | 8 bit | - | - |
| Supply Voltage Min | 4.5 V | - | - |
| Supply Voltage Max | 5.5 V | - | - |
| Supply Current Max | 15 mA | - | - |
| Minimum Operating Temperature | 0 C | - | - |
| Maximum Operating Temperature | + 70 C | - | - |
| Packaging | Tray | - | - |
| Memory Type | NOR | - | - |
| Speed | 55 ns | - | - |
| Architecture | Block Erase | - | - |
| Brand | STMicroelectronics | - | - |
| Moisture Sensitive | Yes | - | - |
| Product Type | NOR Flash | - | - |
| Standard | Not Supported | - | - |
| Factory Pack Quantity | 156 | - | - |
| Subcategory | Memory & Data Storage | - | - |