43 degree C PTC Thermistor suitable for using as a crystal heater on crystals to stabilize frequency. Maximum operating voltage is +25vdc and can be used on a +8 to 14vdc supply for a measured temperature stability of +43 +/- 3 degrees C. 

Specifications:  Actual Amphenol® Part # YQS5745PTO, +12vdc @ 20mA for 43 degrees C, Tolerance 30%, resistance 50ohms @ 25 degrees C, Size ( 8.9mm diameter x 2.5mm thick )

We can generally supply this product in a higher quantity than stocked in around 1 week POA