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| # | Part: | Description: | Manuf. | Package | Pins | T°min | T°max | PDF size |
| 1. |  M4T28-BR12SH | 5.0 OR 3.0V, 512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR | STMicroelectronics | STMICROELECTRONICS | - | - | - | 241 Kb |
| 2. | M4T28-BR12SH | TIMEKEEPER SNAPHAT Battery & Crystal | STMicroelectronics | STMICROELECTRONICS | - | - | - | 51 Kb |
| 3. | M4T28-BR12SH | 5.0 V PC real-time clock | STMicroelectronics | STMICROELECTRONICS | - | - | - | 221 Kb |
| 4. | M4T28-BR12SH | Serial Real Time Clock with 56 Bytes of NVRAM | STMicroelectronics | STMICROELECTRONICS | - | - | - | 162 Kb |
| 5. | M4T28-BR12SH | Serial Real Time Clock with 44Bytes NVRAM and Reset | STMicroelectronics | STMICROELECTRONICS | - | - | - | 234 Kb |
| 6. | M4T28-BR12SH | 3.0/3.3V I2C Combination Serial RTC, NVRAM Supervisor and Microprocessor Supervisor | STMicroelectronics | STMICROELECTRONICS | - | - | - | 236 Kb |
| 7. | M4T28-BR12SH | 5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER^ SRAM | STMicroelectronics | STMICROELECTRONICS | - | - | - | 448 Kb |
| 8. | M4T28-BR12SH | TIMEKEEPER SNAPHAT (BATTERY & CRYSTAL) | STMicroelectronics | STMICROELECTRONICS | - | - | - | 59 Kb |
| 9. | M4T28-BR12SH | 5.0 OR 3.0V, 512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR | STMicroelectronics | STMICROELECTRONICS | - | - | - | 241 Kb |
| 10. | M4T28-BR12SH | 3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM | STMicroelectronics | STMICROELECTRONICS | - | - | - | 181 Kb |
| 11. | M4T28-BR12SH1 | TIMEKEEPER SNAPHAT Battery & Crystal | STMicroelectronics | STMICROELECTRONICS | - | - | - | 51 Kb |
| 12. | M4T28-BR12SH1 | Serial real-time clock with 44 bytes NVRAM and reset | STMicroelectronics | STMICROELECTRONICS | - | - | - | 244 Kb |
| 13. | M4T28-BR12SH1 | 3.3V, 256Kbit (32Kbit x 8) TIMEKEEPER^ SRAM | STMicroelectronics | STMICROELECTRONICS | - | - | - | 181 Kb |
| 14. | M4T28-BR12SH1 | Serial real-time clock with 44 bytes NVRAM and reset | STMicroelectronics | STMICROELECTRONICS | - | - | - | 267 Kb |
| 15. | M4T28-BR12SH1 | TIMEKEEPER^ SNAPHAT^ (battery and crystal) | STMicroelectronics | STMICROELECTRONICS | - | - | - | 100 Kb |
| 16. | M4T28-BR12SH1 | TIMEKEEPER SNAPHAT (BATTERY & CRYSTAL) | STMicroelectronics | STMICROELECTRONICS | - | - | - | 59 Kb |
| 17. | M4T28-BR12SH1TR | TIMEKEEPER SNAPHAT (BATTERY & CRYSTAL) | STMicroelectronics | STMICROELECTRONICS | - | - | - | 59 Kb |
| 18. | M4T28-BR12SH1TR | TIMEKEEPER^ SNAPHAT^ (battery and crystal) | STMicroelectronics | STMICROELECTRONICS | - | - | - | 100 Kb |
| 19. | M4T28-BR12SH6 | TIMEKEEPER SNAPHAT Battery & Crystal | STMicroelectronics | STMICROELECTRONICS | - | - | - | 51 Kb |
| 20. | M4T28-BR12SH6 | TIMEKEEPER SNAPHAT (BATTERY & CRYSTAL) | STMicroelectronics | STMICROELECTRONICS | - | - | - | 59 Kb |
