ST’s Battery and Crystal products are detachable lithium power sources housed in a special top called SNAPHAT®, that are compatible with Serial interface RTC SOH28 package and ST’s nonvolatile TIMEKEEPER® SRAM and Supervisor surface-mount SOH44 (MH) package. The SNAPHAT top contains both the battery and crystal and is designed to be “snapped on” after the SOIC is surface mounted on the PC board. The battery is available in 48mAh or 120mAh capacity and the crystal is a high precision one with 32.768 kHz nominal frequency. This two-piece solution prevents the battery and crystal from being exposed to the high temperatures of the surface mount process.
To make designing with real-time clock ICs even easier, ST offers a battery life calculation simulator. It allows to evaluate the battery capacity consumption and lifetime of ST's real-time clock ICs.
The SNAPHAT® modules are compatible with SOH28 SMD Serial RTC devices (I2C or SPI Interface) and SOH28 and SOH44 Parallel RTC devices:
| Parallel Interface | Serial interface |
| M48T08Y-10MH1F | M41ST85WMH6F |
| M48T201V-85MH1F | M41T11MH6F |
| M48T201Y-70MH1F | M41T94MH6F |
| M48T35AV-10MH1F | |
| M48T35Y-70MH1F | |
| M48T37V-10MH1F | |
| M48T37Y-70MH1F | |
| M48T58Y-70MH1F |
Product types:
- M4T28-BR12SH = 48 mAh
- M4T32-BR12SH = 120 mAh
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Benefits
- Space saving
- Spare part easy replacement
- No soldering/de-soldering needed.