Folks,
Is anyone aware of a small, PCB-mounted (preferably SMT) device that acts like a temperature fuse? Something on the PCB that will break (or may be make) a fusable link if the temperature of the PCB exceeds a threshold temperature somewhere between 40C and 100C ? If such exposure takes place, it will last for hours. I have a suspicion that these devices might be either nontrivial or nonexistent, because they would need to survive the soldering temperatures that are higher than their threshold. On the other hand, there are fire sprinklers that have this type of behavior.
Unfortunately, the arrangements such as thermistor-comparator-flipflop-FET will not work, because the circuit doesnt have power.
I know that there are permanent temperature labels that change the color with temperature and retain the color of the maximum temperature (like these http://www.omega.com/toc_asp/subsectionSC.asp?subsection=F02&book=Temperature). But they cant disable the circuit. They are only visual aids.
Any references, insights or inspiration is appreciated!
Cheers,
Nick
Is anyone aware of a small, PCB-mounted (preferably SMT) device that acts like a temperature fuse? Something on the PCB that will break (or may be make) a fusable link if the temperature of the PCB exceeds a threshold temperature somewhere between 40C and 100C ? If such exposure takes place, it will last for hours. I have a suspicion that these devices might be either nontrivial or nonexistent, because they would need to survive the soldering temperatures that are higher than their threshold. On the other hand, there are fire sprinklers that have this type of behavior.
Unfortunately, the arrangements such as thermistor-comparator-flipflop-FET will not work, because the circuit doesnt have power.
I know that there are permanent temperature labels that change the color with temperature and retain the color of the maximum temperature (like these http://www.omega.com/toc_asp/subsectionSC.asp?subsection=F02&book=Temperature). But they cant disable the circuit. They are only visual aids.
Any references, insights or inspiration is appreciated!
Cheers,
Nick