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FM51S3 Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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FM51S3 Datasheet(HTML) 4 Page - Fairchild Semiconductor |
4 / 6 page 4 www.fairchildsemi.com FM51 Rev. C Figure 1. FM51 Output Voltage vs. Temperature Mounting The FM51 can be easily mounted by gluing or cementing it to a surface. In this case, its temperature will be within about 0.2 °C of the temperature of the surface it is attached to if the ambient air temperature is almost the same as the surface temperature. If the air temperature is much higher or lower than the surface tempera- ture, the actual temperature of the FM51 die will be at an intermediate temperature between the surface temperature and the air temperature. To ensure good thermal conductivity, the backside of the FM51 die is directly attached to the GND pin. The lands and traces to the FM51 will, of course, be part of the printed circuit board, which is the object whose temperature is being measured. These printed circuit board lands and traces will not cause the FM51’s tempera- ture to deviate from the desired temperature. Alternatively, the FM51 can be mounted inside a sealed-end metal tube, and can then be dipped into a bath or screwed into a threaded hole in a tank. As with any IC, the FM51 and accompa- nying wiring and circuits must be kept insulated and dry to avoid leak1ge and corrosion. This is especially true if the circuit may operate at cold temperatures where condensation can occur. Printed-circuit coatings and varnishes such as Humiseal and epoxy paint or dips can be used to ensure that moisture cannot corrode the FM51 or its connections. -50 -40 -25 25 50 75 100 125 100 V OUT (mV) Temperature ( C) 0 Temperature ( C) = VOUT - 500 mV 10 mV/ C 500 1750 750 |
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