(1/2)
Conformity to RoHS Directive
Varistors(SrTiO )
3
For Micro-motors
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 perfor-
mances of these varistors to meet the latest demands. This varis-
tor line covers the traditional shapes and dimensions as well as the
more varied and specialized applications.
FEATURES
PRODUCT IDENTFICATIONS
ELECTRICAL PERFORMANCES
VAR-18
(1)
–
(2)
(3)
(4)
(5)
(6)
(7)
• 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.
(1) Series name
(2) Outer diameter
080: ø8mm
107: ø10.7mm
(3) Varistor voltage
053: 5.3V
• 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
157: 15.7V
(4) Varistor voltage tolerance
M: 20%
(5) Number of electrodes
3, 5, 7
(6) Electrode location
P: Plane
• 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.
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
–25 to +85°C
PRODUCT LINEUP
∆E10,∆α10 15%
• 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.
∆E10,∆α10 10%
∆E10,∆α10 10%
9.8N min.
14.7N min.
Electrode tensile strength
VARISTOR VOLTAGE TEMPERATURE CHARACTERISTICS
20
10
VAR-18
80
0
–40
–20
20
40
60
0
Temperature(°C)
–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.
003-03 / 20070223 / e9c12_var.fm
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