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TMP36 TO-92

FEATURES
Low voltage operation (2.7 V to 5.5 V)
Calibrated directly in ?C
10 mV/?C scale factor (20 mV/?C on TMP37)
?2?C accuracy over temperature (typ)
?0.5?C linearity (typ)
Stable with large capacitive loads
Specified ?40?C to +125?C, operation to +150?C
Less than 50 ?A quiescent current
Shutdown current 0.5 ?A max
Low self-heating
Qualified for automotive applications
APPLICATIONS
Environmental control systems
Thermal protection
Industrial process control
Fire alarms
Power system monitors
CPU thermal management

The TMP36 is a low voltage, precision centigrade temperature sensor. It provides a voltage output that is linearly proportional to the Celsius temperature. It also doesn?t require any external calibration to provide typical accuracies of ?1?C at +25?C and ?2?C over the ?40?C to +125?C temperature range. We like it because it?s so easy to use: Just give the device a ground and 2.7 to 5.5 VDC and read the voltage on the Vout pin. The output voltage can be converted to temperature easily using the scale factor of 10 mV/?C.

These sensors use a solid-state technique to determine the temperature. That is to say, they don’t use mercury (like old thermometers),?bimetalic strips?(like in some home thermometers or stoves), nor do they use?thermistors?(temperature sensitive resistors). Instead, they use the fact as temperature increases, the voltage across a diode increases at a known rate. (Technically, this is actually the voltage drop between the base and emitter – the Vbe – of a transistor.) By precisely amplifying the voltage change, it is easy to generate an analog signal that is directly proportional to temperature. There have been some improvements on the technique but, essentially that is how temperature is measured.

The good news is all that complex calculation is done?inside?the chip – it just spits out the temperature, ready for you to use!

Because these sensors have no moving parts, they are precise, never wear out, don’t need calibration, work under many environmental conditions, and are consistant between sensors and readings. Moreover they are very inexpensive and quite easy to use.