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Thermal Time Constant (W) = 68.0028 seconds

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W

18

TMP108

SBOS663A – APRIL 2013 – REVISED SEPTEMBER 2019

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Copyright © 2013–2019, Texas Instruments Incorporated

Typical Application (continued)

8.2.3 Application Curves

Figure 16 shows the step response of the TMP108 device to a submersion in an oil bath of 100°C from room

temperature (25°C.) The time constant, or the time for the output to reach 63% of the input step, is about 1

second. Figure 17 shows the step response of the TMP108 device to an insertion in an air chamber of 100°C

from room temperature (25°C.) The time-constant is 68 seconds. The time-constant result depends on the

printed-circuit board (PCB) that the TMP108 device is mounted. For this test, the PCB is 0.5 in × 0.5 in, and the

PCB thickness is 32 mils.

Figure 16. Moving Oil Thermal Response

Figure 17. Still Air Thermal Response

9 Power Supply Recommendations

The TMP108 operates on a power supply range from 1.4 V to 3.6 V. A power-supply bypass capacitor is

required, which must be placed as close to the supply and ground pins of the device as possible. A typical supply

bypass capacitor is 100 nF.