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| Part Number | PCF2123BS/1,518 | PCF2123BS/1,512 | 
|---|---|---|
| Manufacturer | NXP USA Inc. | NXP USA Inc. | 
| Product Status | Active | Discontinued at Digi-Key | 
| Type | Clock/Calendar | Clock/Calendar | 
| Features | Alarm, Leap Year, Square Wave Output, Watchdog Timer | Alarm, Leap Year, Square Wave Output, Watchdog Timer | 
| Memory Size | - | - | 
| Time Format | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | 
| Date Format | YY-MM-DD-dd | YY-MM-DD-dd | 
| Interface | SPI | SPI | 
| Voltage - Supply | 1.6V ~ 5.5V | 1.6V ~ 5.5V | 
| Voltage - Supply, Battery | - | - | 
| Current - Timekeeping (Max) | 0.33µA ~ 0.38µA @ 2V ~ 5V | 0.33µA ~ 0.38µA @ 2V ~ 5V | 
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | 
| Mounting Type | Surface Mount | Surface Mount | 
| Package / Case | 16-VFQFN Exposed Pad | 16-VFQFN Exposed Pad | 
| Supplier Device Package | 16-HVQFN (3x3) | 16-HVQFN (3x3) |