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TMP63

SNIS211 – OCTOBER 2019

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7 Detailed Description

7.1 Overview

The TMP63 series of silicon linear thermistors has a linear positive temperature coefficient (PTC) that results in a

uniform and consistent temperature coefficient resistance (TCR) across a wide operating temperature range.

7.2 Functional Block Diagram

Figure 1. Typical Implementation Circuits

7.3 Feature Description

The TMP63 has good linear behaviour across the whole temperature range, but a small non-linearity can be

observed as well as supply dependence. To fabricate the TMP63, the engineer can use a special silicon process

where the device key characteristics—the temperature coefficient resistance (TCR) and nominal resistance

(R25)—are controlled by the doping level and active region area. Note that the TMP63 has an active area and a

substrate due to the polarized terminals of the device. The positive terminal should be connected to the highest

potential, while the negative terminal (which is tied to the substrate internally) should be connected to the lowest

potential. Equation 1 can help the user approximate the TCR.

Table 1 and Table 2 show the typical resistance, resistance spread, and maximum expected error across

temperature using a direct ideal bias current or an ideal voltage bias in a divider circuit. The tables provided are

for specific applications. Table 1 is for constant current applications supplying 20 µA of constant current. Table 2

is for a circuit having a bias voltage of 2.5 V supplying a resistor divider consisting of a top resistor of 100 kΩ

with the TMP63 on the bottom. These tables are not to be used if operating either circuit under different currents,

bias voltages or different Resistor values. New tables will be required based on your specific design.

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Below are the definitions of the key terms used throughout this document:

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