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| PartNumber | 24LC21-I/P | 24LC21/P | 24LC21 |
| Description | EEPROM 2.5V Dual Mode | EEPROM 2.5V Dual Mode | |
| Manufacturer | Microchip | Microchip | |
| Product Category | EEPROM | EEPROM | Memory |
| RoHS | Y | Y | - |
| Mounting Style | Through Hole | Through Hole | - |
| Package / Case | PDIP-8 | PDIP-8 | - |
| Memory Size | 1 kbit | 1 kbit | - |
| Organization | 128 x 8 | 128 x 8 | - |
| Interface Type | Serial, 2-Wire, I2C | Serial, 2-Wire, I2C | - |
| Access Time | 900 ns | 10 ms | - |
| Data Retention | 200 Year | 200 Year | - |
| Maximum Clock Frequency | 400 kHz | 400 kHz | - |
| Supply Current Max | 3 mA | 3 mA | - |
| Supply Voltage Min | 2.5 V | 2.5 V | - |
| Supply Voltage Max | 5.5 V | 5.5 V | - |
| Minimum Operating Temperature | - 40 C | 0 C | - |
| Maximum Operating Temperature | + 85 C | + 70 C | - |
| Series | 24LC21 | 24LC21 | - |
| Packaging | Tube | Tube | - |
| Height | 3.3 mm | 3.3 mm | - |
| Length | 9.27 mm | 9.27 mm | - |
| Width | 6.35 mm | 6.35 mm | - |
| Brand | Microchip Technology | Microchip Technology | - |
| Operating Supply Current | 3 mA | 3 mA | - |
| Operating Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | - |
| Product Type | EEPROM | EEPROM | - |
| Programming Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | - |
| Factory Pack Quantity | 60 | 60 | - |
| Subcategory | Memory & Data Storage | Memory & Data Storage | - |
| Unit Weight | 0.032805 oz | 0.032805 oz | - |