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E-123 View Datasheet(PDF) - SEMITEC Corporation

Part NameE-123 Semitec
SEMITEC Corporation Semitec
DescriptionSURGE ABSORBERS , SENSORS AND MODULES , THERMISTORS
E-123 Datasheet PDF : 44 Pages
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POWER
THERMISTOR
The POWER THERMISTOR is a device for
suppressing inrush current to an electric
circuit. Circuits including electric bulbs or
capacitors induce a inrush current more
than 100 times the normal current when the
circuit switch is turned on. The POWER
THERMISTOR in the circuits protects
electric equipments from being damaged
by limiting the inrush current.
MARK is a NEW POWER THERMISTOR
featuring smaller size and larger energy
capacity to meet severe requirements in
inrush current suppression.
There is the tendency of miniaturization in
low power switching power supply, and
MARK is effectively applicable for the
needs, though the comparatively larger
sized fixed resistors (ceramic coat) are
used now.
Application
The power thermistor will suppress inrush current
which is caused by a capacitor, filament for a bulb,
inverter for fluorescent lamp, a heater and etc., also
will control fan motor speed of cooler for electric
circuit.
Especially MARK was developed to use for power
supply of TV, VCR instead of cement resistor.
How to use the power thermistor
SW
IO
ϪtЊ
VE
C
L
Accordingly, suitable thermistors are 6D-22, 5D-18
and 8D-18, and if we consider in the points of small
time constant which means a small size and large
effect for suppressive current which means large
rated zero-power resistance, 8D-18 is the most
suitable one.
Use the following circuit in the power supply for 100V
and 200V.
SW1
VE
ϪtЊ
SW2
C1
L
C2
Input voltage : AC 100VϮ10%
Steady state current : 2A
Capacitor : 2000F
Ambient temperature : Max.55ЊC
Suppressive current : Max.30A at 25ЊC
The most suitable power thermistor for the above
circuit is required to fulfill the following terms and
conditions.
1. The permissible current at ambient temperature of
55ЊC should be over 2A.
2. The thermistor resistance for suppressive current
which becomes below 30A should be over 4.2
ohm from the under-mentioned formula.
2 VEϫ1.1
RCϩR25
30
RC : Internal resistance value in the circuit is 1 ohm
(100V/100A)
R25 : Rated zero-power resistance at 25ЊC
3. Max. capacitance shall be over 2000F at AC 100V.
ϪtЊ
SW2 : ON (200V), OFF (100V)
21
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NON-CONTACT SENSOR      4 page
  THERMOPILE
  NC SENSOR

THERMISTOR                                          6
   HIGH PRECISION SERIES
   SMD SERIES
  HIGH HEAT-RESISTANCE SERIES
  DISK SERIES
  SENSORS

POWER THERMISTOR              21page
   D-TYPE SERIES
   MARK SERIES
   D2-TYPE SERIES

VRD (TRANSIENT VOLTAGE SUPPRESSOR)    26page
   SMD SERIES
   LEAD TYPE SERIES

CRD (CURRENT REGULATIVE DIODE)           30page
  LEAD TYPE SERIES
  MELF TYPE SERIES

ZENAMIC (METAL OXIDE VARISTOR)          32page
  LEAD TYPE SERIES
  M TYPE SERIES
  SURGE ABSORBER UNIT SERIES

GAS TUBE ARRESTER                               page40
   CERAMIC TUBE SERIES
   GLASS TUBE SERIES
   SA-01 SERIES

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