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PDF ERTJ Data sheet ( Hoja de datos )
| Número de pieza | ERTJ | |
| Descripción | Multilayer NTC Thermistors | |
| Fabricantes | Panasonic Semiconductor | |
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NTC Thermistors
The NTC Thermistors
NTC Thermistors is a negative temperature coefficient resistor that significantly reduces its resistance value as the heat/
ambient temperature rises. Thermistors is sintered in high-temperature (1200 °C to 1500 °C), and manufactured in
various shapes. It’s comprised of 2 to 4 kinds of metal oxides: iron, nickel, cobalt, manganese and copper.
Features
● Temperature Coefficient of Resistance is negative,
and it’s extremely large (–2.8 to –5.1 [%/°C]).
● Various shapes, especially compact size
components are available.
● Selection of resistance vale is comparatively free, it’s
available from several tens Ω to several hundred kΩ.
Recommended Applications
● For temperature measurement or temperature
detection : Thermometer, temperature controller
● For temperature compensation : Transistor, transistor
circuit, quarts oscillation circuit, and measuring
instruments
Physical Characteristics of NTC Thermistors
Thermistor is a resistor sensitive to temperature that is
utilizing the characteristic of metal oxide semiconductor
having large temperature coefficient.
And its temperature dependency of resistance value is
indicated by the following equation :
[ ( )]R=R0 exp B
11
T T0
.....................................(1)
T0 : Standard Temperature 298.15 K(25 °C)
R0 : Resistance at T0 [K]
B : Thermistor Constant [K]
Temperature coefficient (a) in general meaning is indicated
as follows :
a=
B
T2
.................................................................... (2)
Since the change by temperature is considerably large, a is
not appropriate as a constant. Therefore, B value (constant)
is generally used as a coefficient of thermistors.
Major Characteristics of NTC Thermistors
The relation between resistance and temperature of a
thermistor is linear as shown in Fig. 2. The resistance
value is shown in vertical direction in a logarithmic scale
and reciprocal of absolute temperature (adding 273.15 to
centigrade) is shown in horizontal direction.
The B value (constant) determines the gradient of these
straight lines. The B value (constant) is calculated by using
following equation.
B=
knR1 – knR2
11
....................................................... (3)
T1 T2
R1: Resistance at T1 K
R2: Resistance at T2 K
When you calculate this equation, you’ll find that B value
is not exactly constant. The resistance is expressed by
the following equation :
R = AT–C exp D/T ............................................................. (4)
In (4), C is a small positive or negative constant and quite
negligible except for use in precision temperature-measuring
device, therefore, the B value can be considered as constant
number.
In Fig. 1, the relation between the resistance ratio
RT/R25 (R25 : Resistance at 25 °C, RT : Resistance at T °C)
and B Value is shown with T °C, in the horizontal direction.
Fig. 1
1000
100
10
1
B=1000
2000
0.1 3000
4000
5000
0.01 6000
0.001–40 –20 0
20 40 60 80 100 120 140
T (˚C)
Fig. 2
10000000
1000000
100000
10000
1000
100
10
EEERRRTETEJTRJR0J0T0ETEJEJEG0VR0AE11ET01RJ0T040311E1□00□P32□4A7□B□3B2□B□5BB2/255B225B0=/55/5282//5405555/=0/05=75==00=203=44408445200030555050000
1
2.4
125
2.9 3.4
1
T
(×10 –3K–1)
85 50 25
0
T (˚C)
3.9
–20
4.4
–40
Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
02 May. 2015
1 page  
Multilayer NTC Thermistors
● 0603(EIA)
Part Number
ERTJ1VA220□
ERTJ1VA330□
ERTJ1VA400□
ERTJ1VA470□
ERTJ1VA680□
ERTJ1VA101□
ERTJ1VT102□
ERTJ1VT152□
ERTJ1VT202□
ERTJ1VT222□
ERTJ1VT302□
ERTJ1VT332□
ERTJ1VR332□
ERTJ1VR472□
ERTJ1VT472□
ERTJ1VR682□
ERTJ1VG103□A
ERTJ1VR103□
ERTJ1VR153□
ERTJ1VR223□
ERTJ1VR333□
ERTJ1VP473□
ERTJ1VR473□
ERTJ1VV473□
ERTJ1VR683□
ERTJ1VV683□
ERTJ1VS104□A
ERTJ1VV104□
ERTJ1VV154□
ERTJ1VT224□
Nominal Resistance
at 25 °C
22 Ω
33 Ω
40 Ω
47 Ω
68 Ω
100 Ω
1.0 kΩ
1.5 kΩ
2.0 kΩ
2.2 kΩ
3.0 kΩ
3.3 kΩ
3.3 kΩ
4.7 kΩ
4.7 kΩ
6.8 kΩ
10 kΩ
10 kΩ
15 kΩ
22 kΩ
33 kΩ
47 kΩ
47 kΩ
47 kΩ
68 kΩ
68 kΩ
100 kΩ
100 kΩ
150 kΩ
220 kΩ
□ : Resistance Tolerance Code
Resistance
Tolerance
±3 %(H)
or
±5 %(J)
B Value
at 25/50(K)
2750 K±3 %
2750 K±3 %
2800 K±3 %
2800 K±3 %
2800 K±3 %
2800 K±3 %
4500 K±2 %
4500 K±2 %
4500 K±2 %
4500 K±2 %
4500 K±2 %
4500 K±2 %
4250 K±2 %
4250 K±2 %
4500 K±2 %
4250 K±2 %
(3380 K)
4250 K±2 %
4250 K±2 %
4250 K±2 %
4250 K±2 %
4100 K±2 %
4250 K±2 %
4700 K±2 %
4250 K±2 %
4700 K±2 %
(4330 K)
4700 K±2 %
4700 K±2 %
4500 K±2 %
B Value
at 25/85(K)
(2700 K)
(2700 K)
(2750 K)
(2750 K)
(2750 K)
(2750 K)
(4450 K)
(4450 K)
(4450 K)
(4450 K)
(4450 K)
(4450 K)
(4300 K)
(4300 K)
(4450 K)
(4300 K)
3435 K±1%
(4300 K)
(4300 K)
(4300 K)
(4300 K)
(4150 K)
(4300 K)
(4750 K)
(4300 K)
(4750 K)
4390 K±1%
(4750 K)
(4750 K)
(4580 K)
Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
03 May. 2015
5 Page 
Multilayer NTC Thermistors
1.3 Environmental Restrictions
The Thermistors shall not be operated and/or
stored under the following conditions.
(1) Environmental conditions
(a) Under direct exposure to water or salt water
(b) Under conditions where water can condense
and/or dew can form
(c) Under conditions containing corrosive gases
such as hydrogen sulfide, sulfurous acid,
chlorine and ammonia
(2) Mechanical conditions
The place where vibration or impact that
exceeds specified conditions written in delivery
specification is loaded.
1.4 Measurement of Resistance
The resistance of the Thermistors varies depending
on ambient temperatures and self-heating. To
measure the resistance value when examining circuit
configuration and conducting receiving inspection
and so on, the following points should be taken into
consideration:
1 Measurement temp : 25±0.1 °C
Measurement in liquid (silicon oil, etc.) is
recommended for a stable measurement temperature.
2 Power : 0.10 mW max.
4 terminal measurement with a constant-current
power supply is recommended.
2. Design of Printed Circuit Board
2.1 Selection of Printed Circuit Boards
There is a possibility of performance deterioration
by heat shock (temperature cycles), which causes
cracks, from alumina substrate.
Please confirm that the substrate you use does
not deteriorate the Thermistors’ quality.
2.2 Design of Land Pattern
(1) Recommended land dimensions are shown below.
Use the proper amount of solder in order
to prevent cracking. Using too much solder
places excessive stress on the Thermistors.
Recommended Land Dimensions
Land
SMD
Solder resist
ba
Size Code
(EIA)
Z(0201)
0(0402)
1(0603)
Component
dimensions
LWT
0.6 0.3 0.3
1.0 0.5 0.5
1.6 0.8 0.8
Unit (mm)
abc
0.2 to 0.3 0.25 to 0.30 0.2 to 0.3
0.4 to 0.5 0.4 to 0.5 0.4 to 0.5
0.8 to 1.0 0.6 to 0.8 0.6 to 0.8
(2) The land size shall be designed to have equal
space, on both right and left sides. If the
amount of solder on both sides is not equal,
the component may be cracked by stress,
since the side with a larger amount of solder
solidifies later during cooling.
Recommended Amount of Solder
(a) Excessive amount (b) Proper amount (c) Insufficient amount
2.3 Utilization of Solder Resist
(1) Solder resist shall be utilized to equalize the
amounts of solder on both sides.
(2) Solder resist shall be used to divide the
pattern for the following cases;
· Components are arranged closely.
· The Thermistor is mounted near a component
with lead wires.
· The Thermistor is placed near a chassis.
Refer to the table below.
Prohibited Applications and Recommended Applications
Item
Prohibited
applications
Improved applications
by pattern division
Mixed mounting
with a component
with lead wires
The lead wire of a
component with lead wires
Solder resist
Arrangement
near chassis
Chassis
Solder
(Ground solder)
Solder resist
Retro-fitting of
component with
lead wires
Electrode pattern
A lead wire of
Soldering Retro-fitted
iron component
Solder resist
Lateral
arrangement
Portion to be
excessively soldered
Land
Solder resist
2.4 Component Layout
To prevent the crack of Thermistors, try to
place it on the position that could not easily
be affected by the bending stress of substrate
while mounting procedures or procedures
afterwards.
Placement of the Thermistors near heating
elements also requires the great care to be
taken in order to avoid stresses from rapid
heating and cooling.
Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
03 May. 2015
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ERTJ.PDF ] | |
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