KTY81_SER_5 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 05 — 25 April 2008 3 of 15
NXP Semiconductors
KTY81 series
Silicon temperature sensors
5. Limiting values
6. Characteristics
[1] The thermal time constant is the time taken for the sensor to reach 63.2 % of the total temperature difference. For example, if a sensor
with a temperature of 25 °C is moved to an environment with an ambient temperature of 100 °C, the time for the sensor to reach a
temperature of 72.4 °C is the thermal time constant.
Table 5. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter Conditions Min Max Unit
I
sen(cont)
continuous sensor current in free air; T
amb
=25°C - 10 mA
in free air; T
amb
= 150 °C- 2 mA
T
amb
ambient temperature −55 +150 °C
Table 6. Characteristics
T
amb
=25
°
C; in liquid; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
R
25
sensor resistance I
sen(cont)
=1mA
KTY81/110 990 - 1010 Ω
KTY81/120 980 - 1020 Ω
KTY81/121 980 - 1000 Ω
KTY81/122 1000 - 1020 Ω
KTY81/150 950 - 1050 Ω
KTY81/210 1980 - 2020 Ω
KTY81/220 1960 - 2040 Ω
KTY81/221 1960 - 2000 Ω
KTY81/222 2000 - 2040 Ω
KTY81/250 1900 - 2100 Ω
TC temperature coefficient - 0.79 - %/K
R
100
/R
25
resistance ratio T
amb
= 100 °C and 25 °C 1.676 1.696 1.716
R
−55
/R
25
resistance ratio T
amb
= −55 °C and 25 °C 0.480 0.490 0.500
∆R
25
drift of sensor resistance at
25 °C
10000 h continuous
operation; T
amb
= 150 °C
KTY81/1 series - 1.6 - Ω
KTY81/2 series - 3.2 - Ω
τ
th
thermal time constant in still air
[1]
-30-s
in still liquid
[1]
-5-s
in flowing liquid
[1]
-3-s
