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Last Updated on: Thursday, November 30, 2017 07:43 AM

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Temperature Sensitive MOSFET

Recently I was asked by a company to discover why one of their products failed to operate properly in cold temperatures.  A simplified version of the circuit is shown below.

A simplified version of the circuit is shown below. Two n-channel MOSFETs and a few resistors are wired to form a flip/flop latch circuit.  Each time the pushbutton switch is pressed, the circuit changes state and remains in that state until another activation of the switch.  The circuit is used in a 3v lithium battery coin cell powered product. The company told me that many of their devices, when placed in a freezer to simulate operation in cold weather, would not change state using the pushbutton switch but worked perfectly at room temperature.

Click on Drawing Below to view PDF version of Schematic

TN0201 Data Sheet Link:  http://www.vishay.com/docs/72671/tn0201k.pdf
BSN20 Data Sheet Link:   http://www.nxp.com/documents/data_sheet/BSN20.pdf

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DC Magazine, Issue, Page 3: Temperature Sensitive MOSFET


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