24PC datasheet(18/73 Pages) HONEYWELL

18 / 73 page

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TEMPERATURE - THERMISTORS

Thermistors change resistance with a change in temperature. They do

not amplify, rectify, polarize or generate a signal. The thermistor

temperature may be changed by the surrounding temperature or by

self-heating the thermistor by passing a current through it.

Most applications such as temperature measurement and control or

copper coil compensation require that the power dispersed in a

thermistor be kept to a minimum so as not to perceptibly self-heat the

thermistor. Other applications depend entirely on the self-heating effect.

When the surrounding temperature is fixed, the resistance of a thermistor

is largely a function of power being dispersed within it, raising its

temperature above its environment. Under these operating conditions,

the temperature may rise 100 °C to 200 °C [121 °F to 392 °F] and the

resistance may be lowered to 1/1000th of its original value at low current.

This self-heating characteristic provides a whole field of uses for the

thermistor. In the self-heat state it is thermally sensitive (its resistance will

be changed) to any condition, changing the rate at which heat is

conducted away from it. If the rate of heat removal is ideally fixed, then

the thermistor is sensitive to power input and suited for use in voltage or

power level control applications.

Glass Encapsulated Chip (GEC)

Thermistors

The GECs are high-quality, hermetically-sealed, glass-encapsulated chip

thermistors in an axial lead package. They cover the full temperature

range of -60 °C to 300 °C [-76 °F to 572 °F]. These rugged sensors are

designed for applications which demand reliability at low cost. The

uniform dimensions are ideally suited for automated assembly.

Operating temperature:

-60 °C to 300 °C [-76 °F to 572 °F]

Encapsulation:

DO-35 glass

Lead material:

Tinned copper-clad steel

Dissipation constant (DC):

2.5 mW/°C in still air min.

Time constant (TC):

4 s in still air max.

Resistance range at 25 °C [77 °F]:

1 kOhm to 1 MOhm

Interchangeable R/T curve matched

±1 °C from 0 °C to 100 °C [32 °F to 212 °F]

OHM

R/T CURVE

REFERENCE

10,000

135-103LFW-J01

20,000

135-203LFW-J01

30,000

135-303LFW-J01

50,000

135-503LFW-J01

100,000

135-104LFW-J01

CHIP

THERMISTOR

4,6

[0.81]

0,51 DIA. TINNED COPPER CLAD STEEL

[0.020]

2,0 DIA.

[0.08]

28,6

[1.125]

GLASS

ENCAPSULATION

OPTIONS

At 25 °C [77 °F]

OHM

% TOLERANCE

R/T CURVE

REFERENCE

1,000

10A

135-102DAG-J01

2,000

135-202FAG-J01

3,000

135-302FAG-J01

5,000

135-502FAF-J01

5,000

135-502FAG-J01

10,000

135-103FAF-J01

10,000

135-103FAG-J01

10,000

135-103LAF-J01

20,000

135-203LAG-J01

30,000

135-303KAG-J01

50,000

135-503LAF-J01

50,000

135-503LAG-J01

100,000

135-104LAF-J01

100,000

135-104LAG-J01

200,000

135-204QAG-J01

500,000

135-504QAG-J01

1 M

135-105QAG-J01

Temperature Sensors -

Thermistors

TEMPERATURE - THERMISTORS

24PC Datasheet(PDF) 18 Page - Honeywell Solid State Electronics Center

24PC Datasheet(HTML) 18 Page - Honeywell Solid State Electronics Center

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