PTC Thermistors Motor Start Pellets
www.vishay.com For technical questions, contact: ceramitesupport@vishay.com Document Number: 22998
1Revision: 11-Aug-10
PTC307C Series
Vishay Cera-Mite
FEATURES
•Rugged silver electrodes well suited for long life
OEM pressure contact mounting
•Various pellet sizes for optimum inrush current
and switching time
•Withstanding voltage is 2 times the maximum voltage
rating
•UL approved pellets
•Compliant to RoHS directive 2002/95/EC
APPLICATIONS
•Single Phase motorstart assist in
- Refrigerator systems
- Airconditioning systems
- Heat-pumps
- Small compressors
•Inrush current generation
DESCRIPTION
These directly heated thermistors have a positive
temperature coefficient and are primarily intended for inrush
current generation. They consist of a high grade ceramic disk
with two rugged pattern silver electrodes for contact pressure
mounting. These ceramic pellets can be build into proprietary
motor start devices for compressor, refrigerator and HVAC
OEMs.
MOUNTING
The PTC thermistor pellets are suitable for pressure contact
mounting in application specific housing assemblies.
Examples of such assemblies can be found in the PTC305C
series. Assembly housing must be appropriate for usage up
to 180 °C surface temperature of the PTC pellets.
The pellets are not solderable.
MARKING
The pellets are not marked. Marking is available on request
for customized parts.
SAFETY AGENCY RECOGNITION
Vishay Cera-Mite motor start PTC pellet thermistors are
recognized by Underwriter Laboratories file E148885 in
accordance with Standard for Thermistor Type Devices
UL 1434; and Canadian Standards C22.2 No. 0-1991.
QUICK REFERENCE DATA
PARAMETER VALUE UNIT
Resistance value at 25 °C 3.3 to 75 Ω
Tolerance on resistance value ± 30 %
Current ratings 4 to 16 ARMS
Switching times (typical) 0.25 to 1.0 s
Maximum voltage rating 160 to 450 VRMS
Operating temperature range - 10 to + 85 °C
Storage temperature range - 25 to + 105 °C
Document Number: 22998 for technical questions, contact: ceramitesupport@vishay.com www.vishay.com
Revision: 11-Aug-10 2
PTC307C Series
PTC Thermistors Motor Start Pellets Vishay Cera-Mite
Notes
(1) R25 = zero power resistance measured at < 0.5 VDC, standard tolerance ± 30 %, other tolerances and values on request.
(2) RDYN = nominal dynamic resistance during inrush, measured with Vmeas. applied, for information only.
(3) The maximum voltage is the voltage that appears across the PTC in a motor start application. This is not the applied line voltage.
Withstanding voltage of all UL approved types is minimum twice the specified maximum operating voltage.
(4) UL recoginition following XGPU2 category of standard UL1434, file E148885.
TYPICAL PTC CURRENT VS. TIME SHOWING DEFINITION OF RDYN AND SWITCH TIME (t)
ELECTRICAL DATA AND ORDERING INFORMATION
PART NUMBER
R25 (1)
± 30 %
(Ω)
RDYN (2)
(Ω)
Vmeas.
RDYN
(VRMS)
MAX.
VOLTAGE (3)
(VRMS)
MAX.
CURRENT
(ARMS)
SIZE
Ø x T
(mm)
UL (4) Tswitch
(°C)
PTC307C1674P 5.0 4.0 120 200 10 16 + 0.2/- 0.4
x 2.5 ± 0.25
Y 105
PTC307C1700P 6.8 5.0 120 200 10 Y 105
PTC307C1711P 10 7.2 120 200 10 Y 105
PTC307C1668P 5.0 4.0 120 180 12
17.5 ± 0.3
x 2.5 ± 0.25
Y 120
PTC307C1644P 6.8 5.0 120 200 10 Y 120
PTC307C1651P 10 7.2 120 200 10 Y 120
PTC307C1720P 20 13 120 320 8 Y 120
PTC307C1411P 3.3 2.6 120 160 12
20 + 0.2/- 0.8
x 2.5 ± 0.25
Y 120
PTC307C1484P 4.7 3.5 120 180 12 Y 120
PTC307C1544P 5.6 4.1 120 180 12 Y 120
PTC307C1399P 6.8 5.0 120 200 10 Y 120
PTC307C1489P 10 7.2 120 230 9 Y 120
PTC307C1476P 12 8.5 120 250 8.5 Y 120
PTC307C1530P 15 10.5 120 300 8 Y 120
PTC307C1531P 22 15 120 400 8 Y 120
PTC307C1282P 33 22 120 355 6 Y 120
PTC307C1533P 47 30 120 400 5 Y 120
PTC307C1292P 68 42 120 430 4 Y 120
PTC307C1487P 3.9 3.0 50 175 16
20 + 0.2/- 0.8
x 3.2 ± 0.25
Y 120
PTC307C1529P 12 10.3 100 350 8 Y 120
PTC307C1545P 14 12 100 320 8 Y 120
PTC307C1640P 30 15.9 240 380 12 Y 120
PTC307C1740P 30 15.9 240 450 7 Y 120
PTC307C1024P 38 25 240 400 9 20 + 0.2/- 0.8
x 5.0 ± 0.25
Y 120
PTC307C1409P 50 35 240 400 7.5 Y 120
PTC307C1410P 75 50 240 400 5.5 Y 120
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Peak current
I
PTC
(A
RMS
)
(Normalized)
Time to Switch (s)
Motor contactor
closes PTC switchout
Switch time (t)
h = Specic heatcapacity = 2.3 J/Kcm
3
T0 = PTC temp. at time 0
V = PTC volume in cm3 (D/2)2Tπ
Resistance
Current
Switch time (t)
PTC Current (ARMS)
0.01
50 100 150
10
PTC Temperature °C
Switch time t ≈ h x V x (Tswitch - T0)
I2
PTC x RDYN
20 % peak current
RDYN = Vmeas.
IPTC max.
PTC Resistance (Ω)
100
1000
10 000
0.1
1.0
10.0
Solid ceramic disc
Base electrode
Silver electrode
T
D
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Revision: 12-Mar-12 1Document Number: 91000
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