Microchip's MCP9501 / 2 / 3 / 4 family of devices includes temperature switches with ± 1°C (typical) accurate factory set output thresholds. These devices are ideal for high-power supply systems where an overtemperature protection circuit is needed. These devices do not require external components, consume 25 µA (typical), and factory-set thresholds provide simplicity.
In addition, the MCP9501 / 2 / 3 / 4 family of devices provides user selectable 2°C and 10°C (typical) switch hysteresis, and various output configurations. The MCP9501 / 2 outputs switch for rising temperatures while the MCP9503 / 4 switch for falling temperature, with the relative hysteresis at the set thresholds. This family of devices is also available with active-high push-pull and active-low open-drain outputs, the MCP9502 / 4 and the MCP9501 / 3, respectively. The push-pull output is ideal for a microcontroller interface while the open-drain output can be used for level shifting, wired-OR configuration, or as a heater ON / OFF switch.
The MCP9501 / 2 / 3 / 4 operates from 2.7 V to 5.5 V supply. This family is available with a space saving 5-lead SOT-23 package.