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)
Conformity to RoHS Directive
Varistors(SrTiO3)
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
(1) Series name
decreasing at high temperatures and from large currents flowing
(2) Outer diameter
through the varistor. Therefore, these varistors remove design
080: 8mm
obstacles by eliminating the need for setting the room
107: 10.7mm
temperature varistor voltage (E10 value) highera measure that
(3) Varistor voltage
compromises noise reduction levels.
053: 5.3V
Furthermore, the VAR-18 series has also eliminated the problem
157: 15.7V
of the noise level being amplified at low-temperatures and
(4) Varistor voltage tolerance
having a negative impact on the life of the motor.
Because the VAR-18 series has the same large capacitance as M: 20%
(5) Number of electrodes
the conventional varistors, it has excellent functions to eliminate
3, 5, 7
and control motor noise in high frequency bands.
(6) Electrode location
PHYSICAL PERFORMANCES
P: Plane
Because copper electrodes are used and the heat resistance of
S: Side
the ceramic elements has been improved, there is no concern
for electrode erosion or thermal crack even at the higher (7)TDK classification
soldering temperatures that are used in lead-free soldering.
PERFORMANCES
The ceramic element has excellent flexure strength as is
Operating temperature range 25 to +85C
suitable for automatic motor assembly.
Pulse resistance
PRODUCT LINEUP
E10, 1015%
[DC.60V, ON-OFF: 50 cycles]
The varistors in this series come in a wide range of dimensions
Moisture resistance
E10, 1010%
and so can be accurately used for almost all motors.
[602C, 90 to 95(%)RH, 240 hours]
Soldering heat resistance [320C, 3 seconds] E10, 1010%
This lineup includes side-surface electrode varistors that can be
Flexure strength 9.8N min.
used with ultra-compact micro motors.
Electrode tensile strength 14.7N min.
VARISTOR VOLTAGE TEMPERATURE CHARACTERISTICS
20
10
VAR-18
0
40 20 20 40 60 80
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.
001-02 / 20101125 / e9c12_var.fm
E10(%)