Datasheet

2000 Aug 25 3
Philips Semiconductors Product specification
Silicon temperature sensors KTY81-2 series
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 60134).
CHARACTERISTICS
T
amb
=25°C, in liquid, unless otherwise specified.
Notes
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.
2. Inert liquid, e.g. FC43 manufactured by the 3M company.
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
I
cont
continuous sensor current in free air; T
amb
=25°C − 10 mA
in free air; T
amb
= 150 °C − 2mA
T
amb
ambient operating temperature −55 +150 °C
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
R
25
sensor resistance I
cont
=1mA
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
KTY81-251 1900 − 2000 Ω
KTY81-252 2000 − 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
τ thermal time constant; note 1 in still air − 30 − s
in still liquid; note 2 − 5 − s
in flowing liquid; note 2 − 3 − s
rated temperature range −55 − +150 °C