| PartNumber | M41ST87WSS6F | M41ST87WMX6TR | M41ST87WMX6 |
| Description | Real Time Clock 128 NVRAM Serial RTC 3.0 to 3.6 Vcc | Real Time Clock Serial 1280 (160x8) | IC RTC CLK/CALENDAR I2C 28-SOIC |
| Manufacturer | STMicroelectronics | STMicroelectronics | - |
| Product Category | Real Time Clock | Real Time Clock | - |
| RoHS | Y | Y | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | SSOP-20 | SO-28 | - |
| RTC Bus Interface | Serial, 2-Wire, I2C | Serial | - |
| Date Format | DW:DM:M:Y | - | - |
| Time Format | HH:MM:SS:hh | HH:MM:SS:hh | - |
| Battery Backup Switching | Backup Switching | Backup Switching | - |
| RTC Memory Size | 160 B | 160 B | - |
| Supply Voltage Max | 3.6 V | 3.6 V | - |
| Supply Voltage Min | 2.7 V | 2.7 V | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Packaging | Reel | Reel | - |
| Function | Alarm, Calendar, Clock, Timer, Timer Interrupt, Timekeeper, Watchdog | Alarm, Calendar, Clock, Timer Interrupt | - |
| Product | Real Time Clocks | Real Time Clocks | - |
| Series | M41ST87W | M41ST87W | - |
| Brand | STMicroelectronics | STMicroelectronics | - |
| Moisture Sensitive | Yes | Yes | - |
| Operating Supply Current | 500 nA | - | - |
| Product Type | Real Time Clock | Real Time Clock | - |
| Factory Pack Quantity | 1350 | 1000 | - |
| Subcategory | Clock & Timer ICs | Clock & Timer ICs | - |
| Unit Weight | 0.016000 oz | - | - |