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| PartNumber | M41T81M6F | M41T81M6 | M41T81M6E |
| Description | Real Time Clock Serial 512 (64x8) | Real Time Clock | IC RTC CLK/CALENDAR I2C 8-SOIC |
| Manufacturer | STMicroelectronics | - | - |
| Product Category | Real Time Clock | - | - |
| RoHS | Y | - | - |
| Mounting Style | SMD/SMT | - | - |
| Package / Case | SOIC-8 | - | - |
| RTC Bus Interface | Serial, I2C | - | - |
| Date Format | DW:DM:M:Y | - | - |
| Time Format | HH:MM:SS:hh | - | - |
| Battery Backup Switching | Backup Switching | - | - |
| RTC Memory Size | 20 B | - | - |
| Supply Voltage Max | 5.5 V | - | - |
| Supply Voltage Min | 2 V | - | - |
| Minimum Operating Temperature | - 40 C | - | - |
| Maximum Operating Temperature | + 85 C | - | - |
| Packaging | Reel | - | - |
| Function | Alarm, Calendar, Clock, Timer Interrupt | - | - |
| Product | Real Time Clocks | - | - |
| Series | M41T81 | - | - |
| Brand | STMicroelectronics | - | - |
| Product Type | Real Time Clock | - | - |
| Factory Pack Quantity | 2500 | - | - |
| Subcategory | Clock & Timer ICs | - | - |
| Unit Weight | 0.019048 oz | - | - |