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Browse Prior Art Database

Thermistor Mount

IP.com Disclosure Number: IPCOM000048517D
Original Publication Date: 1982-Feb-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Joy, EF: AUTHOR

Abstract

Proper mounting and protection of a sensitive thermistor is described. A Thermistor 1 must be mounted high enough on a printed circuit board 2 to be above other components so as to have an unobstructed path in the airstream over the printed circuit board. The leads 3 of the thermistor cannot be attached to metal stand-off posts on the printed circuit board because the post would serve as a heat sink to the thermistor.

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Thermistor Mount

Proper mounting and protection of a sensitive thermistor is described. A Thermistor 1 must be mounted high enough on a printed circuit board 2 to be above other components so as to have an unobstructed path in the airstream over the printed circuit board. The leads 3 of the thermistor cannot be attached to metal stand-off posts on the printed circuit board because the post would serve as a heat sink to the thermistor.

A V-shaped insulator 4, made from insulating board (more commonly called "fish paper"), with two slots is used to position and hold the thermistor leads. Insulator 4 can be attached to printed circuit board 2 by simply using a convenient component 5 such as a resistor, diode, capacitor or similar component that is part of the circuit. The component 5 can be used as the center-attaching member of the insulator, with the leads of the thermistor passing through slots in the insulator and then attached to the board to serve as the second securing point. This eliminates the need for special attaching devices, such as screws, rivets and eyelets.

The insulating board will not remove any of the heat from the leads of the thermistor. but it can be placed on a printed circuit card so that the thin edge of the insulator is in the direction of the air flow, thus minimizing disturbance of the air flow. The wide portion of the insulator also serves as a protection to the thermistor.

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