NTC Thermistors (Disc Type)
Disc Type NTC Thermistors
Type:
ERTD
The ÒType ERTDÓ are disc type negative temperature
coefficient thermistors. Resistances are available from
8
9
to 150 k9 and B Values are from 3000 K to 5000 K.
The thermistors are designed for temperature detections
and temperature compensations etc., featuring excellent
electrical and thermal stability.
n
Features
l
Wide selection of temperature coefficient
l
Excellent electrical and thermal stability
n
Recommended Applications
l
Temperature detection
l
Temperature compensation for measuring
instruments
l
Temperature compensation for deflection coil in TV
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Explanation of Part Numbers
E
R
T
D
Ω
±
±
±
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Derating Curve for the NTC Thermistor
Rated Load (%)
For the NTC Thermistor operated in ambient
temperatures above 25 ûC, power rating
should
be derated
in accordance with the figure
on the right.
Ambient Temperature (°C)
NTC Thermistors (Disc Type)
n
Ratings and Characteristics
Part No.
Zero-Power
Resistance
at 25 ¡C(9)
20
40
75
100
100
170
250
250
300
350
600
800
1000
1400
2000
3300
4600
8000
10000
15000
33000
50000
150000
8
13
16
20
30
40
75
80
130
500
4000
20000
80000
K
±10 %
B Value
]]
(K)
Maximum
Permissible
Power(W)
Heat
Dissipation
Constant
(mW/¡C)
Thermal Time Resistance
Constant
Ratio
(s)
R
25
/R
50
2.18
2.30
2.62
2.48
2.62
2.62
2.48
2.76
2.76
2.48
2.83
0.4
4.5
20
2.76
2.61
2.76
2.83
2.83
2.90
2.90
2.90
2.98
3.22
3.22
3.48
2.18
2.30
2.30
2.30
2.30
2.30
0.6
7.0
27
2.62
2.62
2.62
2.83
2.90
3.22
3.70
L
±15 %
Table
A/B
Curve No.
Ñ
Ñ
1
Ñ
2
3
Ñ
4
Ñ
5
6
7
Ñ
Ñ
8
9
Ñ
10
Ñ
11
12
13
14
15
16
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
Ñ
17
ERTD2FEL
]
200S
ERTD2FFL 400S
]
3000
3200
3700
3500
3700
3700
3500
3900
3900
3500
4000
3900
3700
3900
4000
4000
4100
4100
4100
4200
4500
4500
4800
3000
3200
3200
3200
3200
3200
3700
3700
3700
4000
4100
4500
5000
ERTD2FGL 750S
]
ERTD2FFL
]
101S
ERTD2FGL
]
101S
ERTD2FGL 171S
]
ERTD2FFL 251S
]
ERTD2FGL 251S
]
]
ERTD2FGL 301S
ERTD2FFL 351S
]
ERTD2FGL 601S
]
ERTD2FGL
]
801S
ERTD2FGL
]
102S
ERTD2FGL
]
142S
ERTD2FGL 202S
]
]
ERTD2FGL 332S
ERTD2FHL 462S
]
]
]
]
ERTD2FHL 802S
ERTD2FHL 103S
ERTD2FHL 153S
ERTD2FHL
]
333S
ERTD2FHL
]
503S
ERTD2FIL
]
154S
ERTD3FEL 8R0S
]
ERTD3FFL 130S
]
]
]
]
]
ERTD3FFL 160S
ERTD3FFL 200S
ERTD3FFL 300S
ERTD3FFL 400S
ERTD3FGL
]
750S
ERTD3FGL
]
800S
ERTD3FGL 131S
]
]
ERTD3FGL 501S
ERTD3FHL 402S
]
]
ERTD3FHL 203S
ERTD3FIL 803S
]
]
Resistance Tolerance Code
J
±5 %
l
Operating Temperature Range: Ð 30 to +125 ¡C
Tolerance of ÒB valueÓ: ±10 %
kn
(R
25
/R
50
)
R
25
=Resistance at 25.0 ¡C
B=
R
50
=Resistance at 50.0 ¡C
1/298.15Ð1/323.15
]]
NTC Thermistors (Disc Type)
n
Dimensions in mm (not to scale)
Straight Lead Type
F Type
Crimped Lead Type
Z Type
F Type
BD
D2
D3
5.0±0.5
7.5±0.5
T
1.3±0.5
1.4±0.5
k
30.0 min.
30.0 min.
W
2.5±1.0
5.0±1.0
Bd
0.4
0.5
Z Type
BD
D2
D3
5.0±0.5
7.0±0.5
T
1.3±0.5
u
3.0 max.
(nom.2.5)
e
4.5±1.0
h
6.0 max.
(nom.5.0)
W
5.0±1.0
Bd
0.5
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Resistance vs. Temperature (Table A)
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Voltage vs. Current (Table B)
Ω
Ω
Ω
Ω
Ω
×
Ω
NTC Thermistors (Disc Type)
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Resistance Color Code
Code
Color
Black
Brown
Red
Orange
Yellow
Green
Blue
Purple
Gray
White
Gold
Silver
1(1st Digit)
0
1
2
3
4
5
6
7
8
9
Ñ
Ñ
2(2nd Digit)
0
1
2
3
4
5
6
7
8
9
Ñ
Ñ
3(Multiplier)
10
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
Ð1
10
Ð2
n
Taping Dimensions in mm (not to scale)
Taping Type
P
P
0
P
1
P
2
Bd
F
Æh
W
W
0
W
1
W
2
H
H
0
k
BD
0
t
12.7±1.0
12.7±0.3
3.85±0.70
6.35±1.30
0.50±0.05
5.0±1.0
0±5.0
18.0
+1.0
Ð0.5
12.5 min.
9.00
+0.75
Ð0.50
3.0 max
21.0±2.0
16.0±0.5
2.0 max.
4.0±0.3
0.5±0.2
NTC Thermistors (Disc Type)
Disc Type NTC Thermistors
Handling Precautions
The Disc Type NTC Thermistors (hereafter referred to as ÒThe NTC ThermistorsÓ) may fail
through burnout, flaming
or glowing
in the worst case, when subjected to severe conditions of electrical,
environmental and/or
mechanical stresses.
The following
Ò
Safety Precautions
Ó and ÒApplication Notes"
should be studied carefully by you. If
you have a
question
about the
Handling Precautions, please
contact our engineering section or factory.
Safety Precautions
1.
1.1 Operating Power
The NTC Thermistors, should not be operated beyond the specified Maximum Permissible Power in the Catalog or
the individual Specifications,
otherwise,
burnout and damages due to thermal run away
may result.
(if operated
in ambient temperatures above 25 ¡C, power rating should be derated in accordance with the derating curve.)
1.2 Operating Temperature Range
The NTC Thermistors should not be operated beyond the specified Operating Temperature Range in the
Catalog or the individual Specifications.
(Do not touch the heated part of the NTC Themistors by hand at large power consumption.)
1.3 Plastic Molding and Potting
In
the case
of plastic molding or potting, the NTC Thermistors may be damaged or
deteriorate due to extremely
large mechanical stresses such as expanding and shrinking forces caused by the heat treatment of the plastics
applied, depending on curing conditions and type of plastics.
1.4 Environmental Conditions
The NTC Thermistors should not be operated and/or stored under following environmental conditions;
a)
Exposed
directly
to water
or drops of water.
b)
Exposed
directly to sunlight.
c)
Conditions
of dew formation.
d)
Exposed
directly to oil, gasoline or organic solvent and/or atmospheres of them.
e)
Conditions
of deoxidized or corrosive atmospheres such as chlorine, hydrogen sulfide, sulphur oxide
and cracked gas from vinyl chloride etc.
f)
Severe
conditions of extreme vibration or shock.
1.5 Mounting
DonÔt touch other parts to
the thermistor,
because
the outer coating may not provide insulation after mounting
the thermistor.
1.6 Fail-Safe Design for Equipment
In applications
using Thermistors,
equipment should be protected against deterioration and failure
of the Thermistors.
2.1 Soldering Flux
Rosin-based and non-activated type soldering flux is recommended.
2.2 Post Soldering Cleaning
In
the case
of solvent cleaning, outer coating material of the NTC Thermistors may melt in the solvent,
depending on the cleaning condition and type of cleaning solvent.
2.3 Abnormal Mechanical Stresses
The NTC Thermistors may be damaged or deteriorate when dropped or exposed to a large impact. Excessive
shock and impact shall not be applied.
2.4 Soldering
(1) When soldering thermistors, the soldering time should be as short as possible to minimize
the exposure time of
the element to the melting point of solder.
Take into account the solder-heat resistance of the product before use.
(2) In soldering the device, the body and outer coating section should not be touched by
molten solder and/or
heated iron tip.
2.5 Long Term Storage
(1) The NTC Thermistors should not be stored under severe conditions of high temperature and high humidity.
(2) The NTC Thermistors should not be stored under conditions of corrosive atmospheres such as hydrogen
sulfide, surfur oxide and chlorine and ammonia etc.
(3) The NTC Thermistors should not be exposed to direct sunlight.
(4) The NTC Thermistors should not be stored under
conditions of dew
formation.
(5) Store them indoors under 40 ¡C max. and 75 %RH max.
Use them within one year and check the solderability before use.
Safety Precautions
2.Application Notes
