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| PartNumber | RX-8581NB:B3 | RX-8581NB:B3 PURE SN | RX-8581SA B (Q41858151000212) |
| Description | Real Time Clock i2C Bus -40C +85C 5 +/-23ppm 22 PIN | IC RTC CLK/CALENDAR I2C 22-SON | RoHS (ship within 1day) |
| Manufacturer | Epson | - | - |
| Product Category | Real Time Clock | - | - |
| RoHS | Y | - | - |
| Mounting Style | SMD/SMT | - | - |
| Package / Case | SON-22 | - | - |
| RTC Bus Interface | Serial, I2C | - | - |
| Date Format | DW:DM:M:Y | - | - |
| Time Format | HH:MM:SS | - | - |
| Supply Voltage Max | 5.5 V | - | - |
| Supply Voltage Min | 1.8 V | - | - |
| Minimum Operating Temperature | - 40 C | - | - |
| Maximum Operating Temperature | + 85 C | - | - |
| Packaging | Reel | - | - |
| Function | Alarm, Calendar, Clock | - | - |
| Product | Real Time Clocks | - | - |
| Series | RX | - | - |
| Brand | Epson Timing | - | - |
| Product Type | Real Time Clock | - | - |
| Factory Pack Quantity | 250 | - | - |
| Subcategory | Clock & Timer ICs | - | - |
| Part # Aliases | Q41858191000212 | - | - |