Temperature Switch with Selectable Hysteresis

Product Announcement from Microchip Technology, Inc.

These devices do not require external components, consume 5 μA (typical), and the factory set thresholds provide simplicity. In addition, this family of devices provide 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 operate from 2.7V to 5.5V supply. This family is available with space saving 5-lead SOT-23 package.


• Factory Set Temperature Switch

• Available Temperature Switch Thresholds:

- T

SET = -35°C,-25°C, -15°C, -5°C, 5°C, 15°C,

25°C, 35°C, 45°C, 55°C, 65°C, 75°C, 85°C,

95°C, 105°C, 115°C, 125°C

• Wide Operating Voltage Range: 2.7V to 5.5V

• Low Supply Current: 25 μA (typical)

• Temperature Switch Accuracy:

- ±1°C (typical)

- ±4°C (maximum) -15°C to +75°C

- ±6°C (maximum) -40°C to +125°C

• Switch Threshold Options (Hot/Cold):

- Rising Temp.: MCP9501/2 (Hot Option)

- Falling Temp.: MCP9503/4 (Cold Option)

• Output Configuration Options:

- Active Low, Open-Drain Output: MCP9501/3

– Uses External Pull-up Resistor

- Active-High, Push-Pull Output: MCP9502/4

• User Selectable Hysteresis: 2°C or 10°C (typical)

• 5-lead SOT-23 package