307C Overcurrent Thermistors
PTCR Overcurrent Protection
Vishay Cera-Mite
GENERAL PURPOSE
Table 5
PTC CURRENT LIMITERS
• Designed as resettable current
limiters, PTC thermistors offer an
alternative to conventional over-
current protection devices such as
fuses or circuit breakers.
GENERAL PURPOSE PTC THERMISTORS OVERCURRENT PROTECTORS
VISHAY
RATED
MAX.
HOLD (IH
)
TRIP (IT)
MAX.
RES
R25
Ohms
SWITCH
TEMP
°C
D
MAX.
mm
CERA-MITE
PART
VOLTAGE VOLTAGE CURRENT
CURRENT CURRENT
VRMS
VRMS
mA
mA
A
NUMBER
12
12
12
24
24
24
50
50
50
15
15
15
30
30
30
60
60
60
130
170
600
130
175
600
60
120
150
325
475
60
85
95
115
105
350
20
28
31
34
40
45
55
65
90
260
340
1200
260
350
1200
120
240
300
650
950
120
170
190
230
210
700
40
1.1
2.4
10
2.3
3.4
11
0.8
2
2.6
10
13
6
1.2
10
6
1.3
50
12
10
3.5
2
50
30
39
27
20
4.5
600
300
240
200
125
150
100
70
120
105
105
105
105
105
105
105
105
105
105
105
105
105
105
105
105
105
105
105
105
105
105
105
105
105
5.5
8
16
8
307C1455
307C1308
307C1311
307C1315
307C1429
• A wide variety of sizes and current
ranges are available for many
electronic, industrial and automotive
applications. Both standard parts and
custom designs are offered.
9.5
17.5 307C1318
6.5
8
307C1321
307C1323
307C1548
Fig P-13
9.5
Tinned Copper Clad Steel Wire
50
50
60
60
14.5 307C1325
17.5 307C1326
6.5
8
24 AWG when D < 9.5mm
22 AWG when D > 11mm to < 19mm
20 AWG when D > 21mm
12
120
120
120
120
120
120
240
240
240
240
240
240
240
240
240
140
140
140
140
140
140
375
340
310
265
265
320
320
265
265
0.6
0.8
1.5
2
1
5
0.2
0.3
0.33
0.34
0.45
0.4
0.5
0.6
1
307C1329
307C1330
307C1302
5mm
max
11
12.5 307C1303
9.5
19
6.5
6.5
6.5
6.5
6.5
9.5
11
307C1331
307C1333
307C1335
307C1336
307C1337
307C1338
307C1340
307C1339
307C1341
307C1342
307C1343
Note 3
4.5mm
max
56
62
68
80
D
CL
LS
90
CL - Cut Leads are Standard 4.75± 0.5mm
LS - Standard Lead Spacings:
110
130
180
9.5
11
5mm when
7.5mm when
10mm when
D ≤11mm
D = 12.5 to 17.5mm
D ≥19mm
45
Note 2
Note 1
CUSTOM CURRENT LIMITER GUIDELINES
APPLICATION CONSIDERATIONS:
Table 6
• PTC current limiters are intended for service on
telecom systems, automobiles, or the secondary of
control transformers or in similar applications where
energy available is limited by source impedance.They are
not intended for application on AC line voltages where
source energy may be high and source impedance low.
RANGE CHART FOR CUSTOM WIRE LEADED DESIGN
MAX.
D (mm)
COATED
5.5
DESIGN LIMITS (APPROX.)
MAX.
D (mm)
COATED
17.5
DESIGN LIMITS (APPROX.)
VRMS
600
15
600
15
I HOLD
5 mA
150 mA
7 mA
OHMS
2000
13
1200
8
VRMS
600
15
I HOLD
40 mA
950 mA
45 mA
1.1 A
OHMS
125
0.8
100
0.7
80
• Fuses and circuit breakers result in total circuit
isolation after tripping. PTC thermistors provide a
current limiting function by switching to a high
resistance mode. Safety consideration must be given
to the potential shock hazard caused by the steady
state leakage current and voltage potential remaining in
the circuit.
19
21
600
15
6.5
8
200 mA
10 mA
275 mA
13 mA
350 mA
20 mA
450 mA
22 mA
500 mA
30 mA
650 mA
35 mA
800 mA
600
15
55 mA
1.2 A
600
15
850
6
0.6
70
0.5
60
0.45
50
0.4
22.5
23.5
25
600
15
600
15
600
15
60 mA
1.3 A
70 mA
1.4 A
80 mA
1.5 A
9.5
11
600
15
600
15
600
15
600
15
500
4
• Wire leaded PTC current limiting thermistors are intended
for applications which expect a limited number of tripping
operations.Actual life is a function of operating parameters.
For high duty cycle applications, ceramic PTC pellets
mounted in spring contact mechanical housings are
preferred.
350
2.5
250
2.0
200
1.5
150
1.2
12.5
14.5
16
Resistance is proportional
to voltage and inversely
proportional to hold
• Wire size, wire type and coating material can be used to
precisely tailor required operating characteristics.
600
15
current (IH
)
Conformal coating adds 1.5mm
• Options Include: Tape & Reel; Wire Forms; Lead
Spacings.
Document Number: 23089
Revision 14-May-02
www.vishay.com
15
ceramite.support@vishay.com
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