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| PartNumber | MCP7940N-E/MS | MCP7940N-I/MS | MCP7940N-E/SN |
| Description | Real Time Clock I2C GP RTCC 64B SRAM, EXT | Real Time Clock I2C GP RTCC 64B SRAM | Real Time Clock I2C GP RTCC 64B SRAM ExT SER EE, ExT |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | Real Time Clock | Real Time Clock | Real Time Clock |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | MSOP-8 | MSOP-8 | SOIC-8 |
| RTC Bus Interface | Serial, 2-Wire, I2C | Serial, 2-Wire, I2C | Serial, 2-Wire, I2C |
| Date Format | DW:DM:M:Y | DW:DM:M:Y | DW:DM:M:Y |
| Time Format | HH:MM:SS | HH:MM:SS | HH:MM:SS |
| Battery Backup Switching | Backup Switching | Backup Switching | Backup Switching |
| RTC Memory Size | 64 B | 64 B | 64 B |
| Supply Voltage Max | 5.5 V | 5.5 V | 5.5 V |
| Supply Voltage Min | 1.8 V | 1.8 V | 1.8 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 125 C | + 85 C | + 125 C |
| Packaging | Tube | Tube | Tube |
| Function | Alarm, Calendar, Clock | Alarm, Calendar, Clock | Alarm, Calendar, Clock |
| Product | Real Time Clocks | Real Time Clocks | Real Time Clocks |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Product Type | Real Time Clock | Real Time Clock | Real Time Clock |
| Factory Pack Quantity | 100 | 100 | 100 |
| Subcategory | Clock & Timer ICs | Clock & Timer ICs | Clock & Timer ICs |
| Unit Weight | 0.004938 oz | 0.004938 oz | 0.019048 oz |
| Moisture Sensitive | - | - | Yes |