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TMP61-Q1

SNIS210 – APRIL 2019

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Copyright © 2019, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The TMP61-Q1 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.

8.2 Functional Block Diagram

Figure 10. Typical Implementation Circuits

8.3 Feature Description

As shown in Figure 1 and Figure 2, the TMP61-Q1 has good linear behaviour across the whole temperature

range, but a small non-linearity can observed, as well as supply dependence, as shown in Figure 3 and Figure 4.

To fabricate the TMP61-Q1, 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 TMP61-Q1 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 and Equation 2 can help the user approximate the device resistance and TCR. Table 1 and Table 2

show the typical resistances, resistance spread, and maximum expected error across temperature using a direct

Ideal bias current or an ideal voltage bias in a divider circuit.

R (Ω)

≈ 8504.85 + 55.08 T + 0.17 T

2

where

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T is the temperature of interest

(1)

(2)

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

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