© 2011 Microchip Technology Inc. DS22268A-page 1
MCP9501/2/3/4
Features
• 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
Applications
• Power Supply Critical Temperature Shutdown
• Temperature Alarm
• Thermostat Control
•Fan Control
• Base-Stations
• Automotive
Typical Performance
Description
Microchip Technology’s MCP9501/2/3/4 family of
devices are 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 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.
Package Types
0%
10%
20%
30%
40%
50%
-4.0
-2.0
0.0
2.0
4.0
Temperature Accuracy (°C)
Occurrences
T
A
= -35°C to 125°C
V
DD
= 4.1V
32 Units
4
1
2
3
5
GND
Hyst
SOT-23-5
MCP9501/2/3/4
GND
Output
V
DD
Temperature Switch with Selectable Hysteresis
