Ring Varistors
For micro-motors
VAR-18 series
Type:
VAR-18-P (Plane surface electrode type)
VAR-18-S (Side surface electrode type)
Issue date:
December 2010
• All specifications are subject to change without notice.
• Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific
bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.
(1/2)
Varistors(SrTiO3)
For Micro-motors
Conformity to RoHS Directive
VAR-18 Series
Ring varistors are used in a wide range of applications from micro
motor noise absorption to the protection of circuit contacts.
TDK has greatly improved the electrical and physical performances of these varistors to meet the latest demands. This varistor line covers the traditional shapes and dimensions as well as the
more varied and specialized applications.
FEATURES
ELECTRICAL PERFORMANCES
• The temperature characteristics of the varistor voltage (E10
value) are positive. This prevents the varistor voltage from
decreasing at high temperatures and from large currents flowing
through the varistor. Therefore, these varistors remove design
obstacles by eliminating the need for setting the room
temperature varistor voltage (E10 value) higher—a measure that
compromises noise reduction levels.
• Furthermore, the VAR-18 series has also eliminated the problem
of the noise level being amplified at low-temperatures and
having a negative impact on the life of the motor.
• Because the VAR-18 series has the same large capacitance as
the conventional varistors, it has excellent functions to eliminate
and control motor noise in high frequency bands.
PHYSICAL PERFORMANCES
• Because copper electrodes are used and the heat resistance of
the ceramic elements has been improved, there is no concern
for electrode erosion or thermal crack even at the higher
soldering temperatures that are used in lead-free soldering.
• The ceramic element has excellent flexure strength as is
suitable for automatic motor assembly.
PRODUCT LINEUP
• The varistors in this series come in a wide range of dimensions
and so can be accurately used for almost all motors.
• This lineup includes side-surface electrode varistors that can be
used with ultra-compact micro motors.
PRODUCT IDENTFICATIONS
VAR-18
(1)
(2)
(3)
(4)
(5)
(6)
–
(7)
(1) Series name
(2) Outer diameter
080: ø8mm
107: ø10.7mm
(3) Varistor voltage
053: 5.3V
157: 15.7V
(4) Varistor voltage tolerance
M: ±20%
(5) Number of electrodes
3, 5, 7
(6) Electrode location
P: Plane
S: Side
(7)TDK classification
PERFORMANCES
Operating temperature range
Pulse resistance
[DC.60V, ON-OFF: 50 cycles]
Moisture resistance
[60±2°C, 90 to 95(%)RH, 240 hours]
Soldering heat resistance [320°C, 3 seconds]
Flexure strength
Electrode tensile strength
–25 to +85°C
∆E10,∆α10±15%
∆E10,∆α10±10%
∆E10,∆α10±10%
9.8N min.
14.7N min.
∆E10(%)
VARISTOR VOLTAGE TEMPERATURE CHARACTERISTICS
20
10
VAR-18
0
–40
–20
20
40
60
Temperature(°C)
0
80
–10
–20
• Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific
bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.
• All specifications are subject to change without notice.
001-02 / 20101125 / e9c12_var.fm
(2/2)
SHAPES AND DIMENSIONS
PLANE SURFACE ELECTRODE TYPE(3-ELECTRODE)
PLANE SURFACE ELECTRODE TYPE(5-ELECTRODE)
Ring-shaped resistor
Electrode
Ring-shaped resistor
Electrode
T max.
øD2
øD1
Diameter Symbol
024
030
030
042
048
060
066
080
085
085
094
107
120
160
Dimensions(mm)
øD1
2.45±0.1
3.0±0.15
3.0±0.12
4.2±0.15
4.8+0.1, –0.2
6.0±0.2
6.6±0.2
8.0±0.3
8.5±0.2
8.5±0.3
9.4±0.3
10.7+0.2, –0.35
12.0+0.4, –0.1
16.0±0.4
øD2
1.78±0.08
2.0±0.1
2.15±0.1
2.8+0.2, –0.1
3.5+0.2, –0.1
4.0+0.2, –0.1
4.7±0.15
5.0±0.2
5.0±0.2
5.8±0.15
5.78±0.15
6.7+0.25, –0.1
7.5±0.2
9.4±0.3
T max.
0.50
0.50
0.50
0.60
0.60
0.70
0.75
0.75
0.75
0.75
1.05
1.10
1.10
1.70
Number of
electrodes
3
3
3
3
3
3
3
3
3
3
3
3
3 or 5
5
SIDE SURFACE ELECTRODE TYPE(3-ELECTRODE)
SIDE SURFACE ELECTRODE TYPE(6-ELECTRODE)
Ring-shaped resistor
Ring-shaped resistor
Electrode
Electrode
øD2
øD2
T max.
042
066
076
078
086
T max.
øD1
øD1
Diameter Symbol
T max.
øD2
øD1
Dimensions(mm)
øD1
4.2±0.15
6.6±0.2
7.6±0.2
7.8±0.2
8.6±0.2
øD2
2.85+0.2, –0.1
4.7±0.15
5.0±0.2
5.35±0.2
5.0±0.2
T max.
0.60
0.60
0.60
0.65
0.75
Number of
electrodes
3
3 or 6
3 or 6
3
3
ELECTRICAL CHARACTERISTICS (EXAMPLE: OD ø10.7mm type)
Varistor voltage
Tolerance
Nominal varistor voltage
E10mA (V)
α10[1 to 10mA]
Rated power
(mW)
032Y
053M
077M
115M
157M
218M
240M
320M
2.0 to 4.5
4.0 to 6.6
5.9 to 9.4
9.0 to 14.0
13.0 to 18.4
17.6 to 26.0
19.0 to 29.0
26.0 to 38.0
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
500
500
500
500
500
500
500
500
Varistor voltage temperature
coefficient (%/°C)
[25 to 50°C]
±0.2
±0.2
±0.2
±0.2
±0.2
±0.2
±0.2
±0.2
Capacitance
(nF)
[at 1kHz]
1 to 100
1 to 100
1 to 100
1 to 100
1 to 100
1 to 100
1 to 100
1 to 100
• All specifications are subject to change without notice.
001-02 / 20101125 / e9c12_var.fm
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