PTC thermistors (with positive temperature coefficient) represent the ceramic components whose electrical resistance rapidly increases when a certain temperature is exceeded. In such a case the protection from overcurrent is provided. After failure recovery the resistance of PTC thermistors decreases, and the component recovers safety features.
Such elements are mianly produced on the base of ceramics (BaTiO3), a dielectric with electrical resistance at 10 10…10 12 Оhm·sm. When introducing additives of rare earth elements to the (BaTiO3 composition one can decrease electrical resistance up to 10…10² Оhm·sm, corresponding semiconductor elements. The possibility for searching of thermistors with determined characteristics allows to use them as protection elements in modern electronic equipment.
The main fields of PTC thermistors application:
- electronic ballasts
- Protection from overcurrent
- IT systems and electronic equipment
- DC/DC converters
- аutomobile electronucs
- hoequipment for welding
- refrigerating unit
- measuring and temperature control systems
- industrial electronics
During several years Epcos has been one of the world leaders in the field of designing, development and manufacturing of electronuc components, particularly, PTC thermistors. The company produces a wide range of PTC thermistors with different electrical characteristics and sizes, that allows to find a technical solution in order to provide a protection of the equipment.
When choosing the component it is necessary to take into account following features of PTC thermistors:
- RR - nominal resistanse at T= 25°C, Ohm
- IR - nominal current, А
- ΔRТ/RR - Tolerance of R25
- TR -nominal temperature, К
- α - Temperature coeffiicient, %
PTC thermistors series
PTC thermistors for overcurrent protection
During operating of power equipment the danger of overcurrent and short circuits. In order to provide the protection from high current and voltage values Epcos has produced the special series of PTC thermistors,characterising by low resistance at ambient conditions. The resistance of thermistiors strongly depends on ambient temperature. When current flowing the temperature grows, and the thermistor sharply increases resistanse providing the protection from a short circuit.
Disk thermistors
| Type | Inom, А | Rnom, Ohm | Drawing | wmax, mm | hmax, mm | thmax, mm | ordering code | Detailed documentation |
| VR = 12V DC/В AC, Vmax = 20 В DC/В AC | ||||||||
| C945 | 1500 | 0.45 |  |
17.5 | 21.0 | 0.6 | B59945C0160A070 |  |
| C955 | 950 | 0.80 | 13.5 | 17.0 | 0.6 | B59955C0160A070 | ||
| C965 | 700 | 1.20 | 11.0 | 14.5 | 0.6 | B59965C0160A070 | ||
| C975 | 550 | 1.80 | 9.0 | 12.5 | 0.6 | B59975C0160A070 | ||
| C985 | 300 | 4.60 | 6.5 | 10.0 | 0.6 | B59985C0160A070 | ||
| C995 | 150 | 13.0 | 4.0 | 7.5 | 0.5 | B59995C0160A070 | ||
| VR = 12/24 В DC/В AC, Vmax = 30 В DC/В AC | ||||||||
| C935 | 1800 | 0.30 |  |
22.0 | 25.5 | 0.6 | B59945C0160A070 | |
| C945 | 1300 | 0.45 | 17.5 | 21.0 | 0.6 | B59945C0120A070 | ||
| C955 | 850 | 0.8 | 13.5 | 17.0 | 0.6 | B59955C0120A070 | ||
| C965 | 600 | 1.20 | 11.0 | 14.5 | 0.6 | B59965C0120A070 | ||
| C975 | 450 | 1.80 | 9.0 | 12.5 | 0.6 | B59975C0120A070 | ||
| C985 | 250 | 4.60 | 6.5 | 10.0 | 0.6 | B59985C0120A070 | ||
| C995 | 120 | 13.0 | 4.0 | 7.5 | 0.5 | B59995C0120A070 | ||
| VR = 63 V DC/V AC, Vmax = 80 V DC/V AC | ||||||||
| C910 | 1000 | 1.20 | |
22.0 | 25.5 | 0.8 | B59910C0130A070 | |
| C930 | 700 | 1.65 | 22.0 | 25.5 | 0.6 | B59930C0120A070 | ||
| C930 | 700 | 2.20 | 17.5 | 21.0 | 0.8 | B59930C0130A070 | ||
| C940 | 450 | 2.30 | 17.5 | 21.0 | 0.6 | B59940C0120A070 | ||
| C930 | 340 | 1.65 | 22.0 | 25.5 | 0.6 | B59930C0080A070 | ||
| C950 | 320 | 3.70 | 13.5 | 17.0 | 0.6 | B59950C0120A070 | ||
| C950 | 320 | 4.90 | 11.0 | 14.5 | 0.6 | B59950C0130A070 | ||
| C960 | 250 | 5.60 | 11.0 | 14.5 | 0.6 | B59960C0120A070 | ||
| C960 | 250 | 5.60 | 11.0 | 14.5 | 0.6 | B59960C0120A070 | ||
| C960 | 250 | 8.00 | 9.0 | 12.5 | 0.6 | B59960C0130A070 | ||
| C940 | 245 | 2.30 | 17.5 | 21.0 | 0.6 | B59940C0080A070 | ||
| C950 | 170 | 3.70 | 13.5 | 17.0 | 0.6 | B59950C0080A070 | ||
| C970 | 150 | 9.40 | 9.0 | 12.5 | 0.6 | B59970C0120A070 | ||
| C970 | 150 | 20.0 | 6.5 | 10.0 | 0.6 | B59970C0130A070 | ||
| C960 | 130 | 20.0 | 6.5 | 10.0 | 0.6 | B59960C0080A070 | ||
| C970 | 90 | 9.40 | 9.0 | 12.5 | 0.6 | B59970C0080A070 | ||
| C980 | 85 | 25.00 | 6.5 | 10.0 | 0.6 | B59980C0120A070 | ||
| C980 | 85 | 25.00 | 6.5 | 10.0 | 0.6 | B59980C0120A070 | ||
| C980 | 85 | 62.00 | 4.0 | 7.5 | 0.6 | B59980C0130A070 | ||
| C980 | 50 | 25.00 | 6.5 | 10.0 | 0.6 | B59980C0080A070 | ||
| C990 | 50 | 55.0 | 4.0 | 7.5 | 0.5 | B59990C0120A070 | ||
| C990 | 30 | 55.0 | 4.0 | 7.5 | 0.5 | B59990C0080A070 | ||
| VR = 110 V DC/V AC, Vmax = 160 V DC/V AC | ||||||||
| C830 | 525 | 3.7 | |
22.0 | 25.5 | 0.6 | B59830C0160A070 | |
| C845 | 400 | 6.00 | 17.5 | 21.0 | 0.6 | B59840C0160A070 | ||
| C850 | 250 | 10.00 | 13.5 | 17.0 | 0.6 | B59850C0160A070 | ||
| C860 | 180 | 15.00 | 11.0 | 14.5 | 0.6 | B59860C0160A070 | ||
| C870 | 125 | 25.00 | 9.0 | 12.5 | 0.6 | B59870C0160A070 | ||
| C880 | 70 | 70.00 | 6.5 | 10.0 | 0.6 | B59880C0160A070 | ||
| C890 | 35 | 150.00 | 4.0 | 7.5 | 0.5 | B59890C0160A070 | ||
| VR = 230 В DC/В AC, Vmax = 265 В DC/В AC | ||||||||
| C810 | 650 | 3.50 | |
22.0 | 25.5 | 0.8 | B59810C0130A070 | |
| C830 | 460 | 3.70 | 22.0 | 25.5 | 0.6 | B59830C0120A070 | ||
| C830 | 450 | 5.0 | 17.5 | 21.0 | 0.8 | B59830C0130A070 | ||
| C840 | 330 | 6.0 | 17.5 | 21.0 | 0.6 | B59840C0120A070 | ||
| C840 | 330 | 9.0 | 13.5 | 17.0 | 0.6 | B59840C0130A070 | ||
| C850 | 200 | 10.0 | 13.5 | 17.0 | 0.6 | B59850C0120A070 | ||
| C830 | 250 | 3.70 | 22.0 | 25.5 | 0.6 | B59830C0080A070 | ||
| C850 | 200 | 13.0 | 11.0 | 14.5 | 0.6 | B59850C0130A070 | ||
| C840 | 170 | 6.0 | 17.5 | 21.0 | 0.6 | B59840C0080A070 | ||
| C860 | 140 | 15.00 | 11.0 | 14.5 | 0.6 | B59860C0120A070 | ||
| C860 | 140 | 25.00 | 9.0 | 12.5 | 0.6 | B59860C0130A070 | ||
| C850 | 110 | 10.00 | 13.5 | 17.0 | 0.6 | B59850C0080A070 | ||
| C870 | 100 | 25.00 | 9.0 | 12.5 | 0.6 | B59870C0120A070 | ||
| C870 | 100 | 50.0 | 6.5 | 10.0 | 0.6 | B59870C0130A070 | ||
| C860 | 90 | 15.0 | 11.0 | 14.5 | 0.6 | B59860C0080A070 | ||
| C872 | 80 | 35.00 | 9.0 | 12.5 | 0.6 | B59872C0120A070 | ||
| C873 | 70 | 45.00 | 9.0 | 12.5 | 0.6 | B59873C0120A070 | ||
| C874 | 60 | 55.00 | 9.0 | 12.5 | 0.6 | B59874C0120A070 | ||
| C870 | 60 | 25.00 | 9.0 | 12.5 | 0.6 | B59870C0080A070 | ||
| C880 | 55 | 70.00 | 6.5 | 10.0 | 0.6 | B59880C0120A070 | ||
| C875 | 55 | 65.0 | 9.0 | 12.5 | 0.6 | B59875C0120A070 | ||
| C880 | 55 | 160.0 | 4.0 | 7.5 | 0.6 | B59880C0130A070 | ||
| C883 | 35 | 120.0 | 6.5 | 10.0 | 0.6 | B59883C0120A070 | ||
| C890 | 30 | 150.0 | 4.0 | 7.5 | 0.5 | B59890C0120A070 | ||
| C880 | 30 | 70.0 | 6.5 | 10.0 | 0.6 | B59880C0080A070 | ||
| C890 | 15 | 150.0 | 4.0 | 7.5 | 0.5 | B59890C0080A070 | ||
| VR = 380 В DC/В AC, Vmax = 420 В DC/В AC | ||||||||
| C884 | 21 | 600.0 | |
6.5 | 10.0 | 0.6 | B59884C0120A070 | |
| VR = 500 В DC/В AC, Vmax = 550 В DC/В AC | ||||||||
| C885 | 15 | 1200.0 | |
6.5 | 10.0 | 0.6 | BB59885C0120A070 | |
| C886 | 12 | 1500.0 | 6.5 | 10.0 | 0.6 | B59886C0120A070 | ||
SMD thermistors
| Type | Inom, А | Rnom, Ohm | Drawing | Ordering code | Detailed documentation |
| PTC themistors | |||||
| VR = 500 В DC/В AC, Vmax = 550 В DC/В AC | |||||
| B404 | 4 | 3500.0 |
 |
B59085G1120A161 | |
| B406 | 2.5 | 5500 | B59406B0060A040 | ||
| VR = 24 В DC/В AC, Vmax = 30 В DC/В AC | |||||
| P1301 | 310 | 3.1 |
 |
B59301P1120A062 | |
| P1201 | 265 | 4.6 | B59201P1120A062 | ||
| P1301 | 205 | 3.1 | B59301P1080A062 | ||
| P1101 | 170 | 13.0 | B59101P1120A062 | ||
| P1201 | 165 | 4.6 | B59201P1080A062 | ||
| P1101 | 90 | 13.0 | B59101P1080A062 | ||
| VR = 63 В DC/В AC, Vmax = 80 В DC/В AC | |||||
| P1315 | 150 | 16.0 |
|
B59315P1120A062 | |
| P1215 | 100 | 25.0 | B59215P1120A062 | ||
| P1301 | 205 | 3.1 | B59301P1080A062 | ||
| P1315 | 80 | 16.0 | B59315P1080A062 | ||
| P1115 | 70 | 55.0 | B59115P1120A062 | ||
| P1215 | 65 | 25.0 | B59215P1080A062 | ||
| P1115 | 40 | 55.0 | B59115P1080A062 | ||
| VR = 42 В DC/В AC, Vmax = 60 В DC/В AC | |||||
| A622 | 22 | 220 |
 |
B59622A0090A062 | |
| VR = 63 В DC/В AC, Vmax = 80 В DC/В AC | |||||
| A623 | 15 | 470 |
|
B59622A0090A062 | |
| VR = 24 В DC/В AC, Vmax = 30 В DC/В AC | |||||
| A606 | 920 | 27 |
|
B59622A0090A062 | |
| A607 | 70 | 55 | B59607A0120A062 | ||
| VR = 63 В DC/В AC, Vmax = 80 В DC/В AC | |||||
| A707 | 50 | 125 |
|
B59707A0120A062 | |
| VR = 230 В DC/В AC, Vmax = 265 В DC/В AC | |||||
| A807 | 15 | 400.0 |
|
B59807A0120A062 | |
| VR = 230 В DC/В AC, Vmax = 265 В DC/В AC | |||||
| A907 | 12 | 1500.0 |
|
B59907A0120A062 | |
Inrush current limiters in a plastic case
| Type | Umax,V | Rnominal, Ohm | Drawing | Ordering code | Detailed information |
| J105 | 260 | 22 |
 |
B59105J0130A020 | |
| J107 | 440 | 56 | B59107J0130A020 | ||
| J109 | 560 | 100 | B59109J0130A020 |
PTC thermistors for temperature control
PTC thermistors produced by Epcos are widely applied in measuring systems and temperature control systems, lighting equipment, home appliance, automobile electronics, DC/DC-converters and other equipment. These protection devices are characterised by a high operation speed and small sizes and are characterised by a wide range of working temperatures.
PTC thermistors aslimit temperature sensors (Leaded disks, coated, miniaturized)
| Type | TREF±ΔT,°C | Rnominal,Ohm | Drawing | Ordering code | Detailed information |
| VR = 30 V DC | |||||
| C8 | 70±5 | ≤250 |
 |
B59008C0070A040 | |
| 80±5 | B59008C0080A040 | ||||
| 90±5 | B59008C0090A040 | ||||
| 100±5 | B59008C0100A040 | ||||
| 110±5 | B59008C0110A040 | ||||
| 120±5 | B59008C0120A040 | ||||
| 130±5 | B59008C0130A040 | ||||
| 140±5 | B59008C0140A040 | ||||
| 150±5 | B59008C0150A040 | ||||
| 160±5 | B59008C0160A040 | ||||
| VR = 30 В DC | |||||
| C100 | 10±5 | >5000 |
 rs/> |
B59100C0010A070 | |
| 50±5 | <150 | B59100C0050A070 | |||
| 60±5 | ≤100 | B59100C0060A070 | |||
| 70±5 | ≤100 | B59100C0070A070 | |||
| 80±5 | ≤100 | B59100C0080A070 | |||
| 90±5 | ≤100 | B59100C0090A070 | |||
| 100±5 | ≤100 | B59100C0100A070 | |||
| 110±5 | ≤100 | B59100C0110A070 | |||
| 120±5 | ≤100 | B59100C0120A070 | |||
| 130±5 | ≤100 | B59100C0130A070 | |||
| 140±5 | ≤100 | B59100C0140A070 | |||
| 150±5 | ≤100 | B59100C0150A070 | |||
PTC thermistor for motor protection
| Type | TREF±ΔT,°C | Rnominal, Ohm | Drawing | Ordering code | Detailed information |
| VR = 230 В DC/В AC, Rном ≤100 Ohm | |||||
| M1100 | 60±5 | ≤570 |
 |
B59100M1060A070 | |
| 70±5 | ≤570 | B59100M1070A070 | |||
| 80±5 | ≤570 | B59100M1080A070 | |||
| 90±5 | ≤550 | B59100M1090A070 | |||
| 100±5 | ≤550 | B59100M1100A070 | |||
| 110±5 | ≤550 | B59100M1110A070 | |||
| 120±5 | ≤550 | B59100M1120A070 | |||
| 130±5 | ≤550 | B59100M1130A070 | |||
| 140±5 | ≤550 | B59100M1140A070 | |||
| 145±5 | ≤550 | B59100M1150A070 | |||
| 150±5 | ≤550 | B59100M1145A070 | |||
| 155±5 | ≤550 | B59100M1155A070 | |||
| 160±5 | ≤550 | B59100M1160A070 | |||
| 170±5 | ≤570 | B59100M1170A070 | |||
| 180±5 | ≤570 | B59100M1180A070 | |||
Additional information
PTC thermistors data book
Full information on all series of PTC thermistors is represented in Epcos data book.
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