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New PTC Thermistors by Ametherm Offer Industry’s Highest Voltage Rating and Lowest Resistance for Pre-Charge Circuits

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Friday, January 11, 2019

Ametherm introduced a new series of ceramic PTC circuit protection thermistors that combine the industry’s highest voltage rating with lowest available resistance. The CL20 Series PTC Thermistors provide an alternative to fixed resistors and are optimized for inrush current limiting in pre-charge circuits, heater applications, in addition to over-current protection.


Ametherm CL20 thermistor.

The PTC thermistors released today deliver voltage ratings up to 1200 VDC and maximum energy ratings to 600 J. The devices offer five resistance values at 25 °C from 7.0 W to 100.0 W — with tolerance down to 25% — to accommodate a variety of pre-charge times. These resistance values remain unchanged over the operating temperature range of -40 °C to +110 °C.


Providing stability and reliability in high-voltage applications, the CL20 Series of PTC thermistors can withstand hundreds of hits of maximum inrush current without degrading. PTC thermistors do not require reset time and therefore will not result in large inrush current during repetitive use, as their resistance remains in a high state.


Devices in the CL20 Series of PTC thermistors feature a dissipation constant of 22.5 mW/°C, heat capacity from 2.0 J/°C to 3.45J/°C, transition temperature of +120 °C and a thermal time constant of 65 s. Switch and continuous currents for these PTC thermistors range from 450 mA to 1750 mA and 225 mA to 850 mA respectively. They also offer easy PCB mounting, have a diameter of 22 mm, straight leads, and most come with optional outside or inside kinked leads. Ametherm also offers smaller PTC circuit protection devices with diameters from 6 mm to 20 mm.



Ametherm Part #
CL20 7R0120
CL20 100120
CL20 200120
MCL20 500100
CL20 101130
Resistance @ 25 °C
7.0 Ω ±25%
10.0 Ω ±25%
20.0 Ω ±25%
50.0 Ω ±25%
100.0 Ω ±25%
Transition temp.
120 °C
120 °C
120 °C
120 °C
120 °C
Max. voltage
350 Vrms
480 Vrms
680 Vrms
680 Vrms
1200 VDC
Switch current @ 25 °C
1.600 A
0.800 A
0.600 A
0.450 A
1.750 A
Cont. current @ 25 °C
0.850 A
0.400 A
0.300 A
0.225 A
0.650 A
Heat capacity
2.0 J/°C
2.0 J/°C
2.25 J/°C
2.4 J/°C
3.45 J/°C
Dissipation constant
22.50 mW/°C
22.50 mW/°C
22.50 mW/°C
22.50 mW/°C
22.50 mW/°C
Thermal time constant
65.0 s
65.0 s
65.0 s
65.0 s
65.0 s
Max. energy
250 J
250 J
500 J
600 J
600 J
Max. body temp.
172 °C
174 °C
172 °C
178 °C
180 °C
Diameter
22 mm
22 mm
22 mm
22 mm
22 mm


The CL20 Series of PTC thermistors are available from IBS Electronics. Samples and production quantities are available now. 


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For more information on Ametherm’s products or to request a sample, visit IBS ELECTRONICS. Or call 800-527-2888 (toll free in the United States) or +1-714-751-6633 from outside the U.S. and Canada.

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