PTC thermistors for overcurrent
protection
Leaded disks, coated, 12 V
Series/Type:
B599*5
Date:
March 2006
EPCOS AG 2006. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
Applications
Overcurrent and short-circuit protection
Features
Lead-free terminals
Manufacturer's logo and type designation
stamped on in yellow
Low resistance
For rated currents of up to 2.1 A
High thermal stability
UL approval to UL 1434 (file number
E69802)
VDE approval (license number 104843 E)
RoHS-compatible
Options
Leadless disks and leaded disks without
coating available on request
Thermistors with diameter b
11.0 mm are
also available on tape (to IEC 60286-2)
Delivery mode
Cardboard strips (standard)
Cardboard tape reeled or in Ammo pack on
request
Dimensional drawing
Dimensions (mm)
Type
b
max
h
max
d
C935
22.0
25.5
0.6
C945
17.5
21.0
0.6
C955
13.5
17.0
0.6
C965
11.0
14.5
0.6
C975
9.0
12.5
0.6
C985
6.5
10.0
0.6
C995
4.0
7.5
0.5
General technical data
Max. operating voltage
(T
A
= 60
C)
V
max
20
VDC or VAC
Rated voltage
V
R
12
VDC or VAC
Switching cycles
N
100
Reference temperature
(typ.)
T
ref
160
C
Tolerance of R
R
R
R
25
%
Operating temperature range
(V = 0)
T
op
40/+125
C
Operating temperature range
(V = V
max
)
T
op
40/+85
C
Overcurrent protection
Leaded disks, coated, 12 V
C935 ... C995
Page 2 of 9
Please read Important notes and
Cautions and warnings at the end of this document.
Electrical specifications and ordering codes
Type
I
R
mA
I
S
mA
I
Smax
(V = V
max
)
A
I
r
(V = V
max
)
typ.
mA
I
r
(V = V
R
)
typ.
mA
R
R
R
min
Ordering code
C935
2100
4150
10.0
240
380
0.3
0.2
B59935C0160A070
C945
1500
3050
8.0
170
270
0.45
0.3
B59945C0160A070
C955
950
1900
5.5
120
190
0.8
0.5
B59955C0160A070
C965
700
1450
4.3
105
165
1.2
0.7
B59965C0160A070
C975
550
1100
3.0
85
135
1.8
1.1
B59975C0160A070
C985
300
600
1.0
65
100
4.6
2.7
B59985C0160A070
C995
150
300
0.7
40
65
13
7.8
B59995C0160A070
Overcurrent protection
Leaded disks, coated, 12 V
C935 ... C995
Page 3 of 9
Please read Important notes and
Cautions and warnings at the end of this document.
Reliability data
Test
Standard
Test conditions
R
25
/R
25
Electrical endurance,
cycling
IEC 60738-1
Room temperature, I
Smax;
V
max
Number of cycles: 100
< 25%
Electrical endurance,
constant
IEC 60738-1
Storage at V
max
/T
op
Test duration : 1000 h
< 25%
Damp heat
IEC 60738-1
Temperature of air: 40
C
Relative humidity of air: 93%
Duration: 56 days
Test according to IEC 60068-2-78
< 10%
Rapid change
of temperature
IEC 60738-1
T = T
LCT
, T = T
UCT
Number of cycles: 5
Test duration: 30 min
Test according to IEC 60068-2-14, Test Na
< 10%
Vibration
IEC 60738-1
Frequency range: 10 to 55 Hz
Displacement amplitude: 0.75 mm
Test duration: 3 2 h
Test according to IEC 60028-2-6, Test Fc
< 5%
Bump
IEC 60738-1
Pulse shape: half-sine
Acceleration: 50 g
Pulse duration: 1 ms; 6 3 pulses
Test according to IEC 60068-2-29
< 5%
Climatic sequence
IEC 60738-1
Dry heat: T = T
UCT
Test duration: 16 h
Damp heat first cycle
Cold: T = T
LCT
Test duration: 2 h
Damp heat 5 cycles
Tests performed according to
IEC 60068-2-30
< 10%
Overcurrent protection
Leaded disks, coated, 12 V
C935 ... C995
Page 4 of 9
Please read Important notes and
Cautions and warnings at the end of this document.
Characteristics (typical)
PTC resistance R
PTC
versus
PTC temperature T
PTC
(measured at low signal voltage)
PTC current I
PTC
versus PTC voltage V
PTC
(measured at 25
C in still air)
Switching time t
S
versus switching current I
S
(measured at 25
C in still air)
Rated current I
R
versus ambient temperature T
A
(measured in still air)
Overcurrent protection
Leaded disks, coated, 12 V
C935 ... C995
Page 5 of 9
Please read Important notes and
Cautions and warnings at the end of this document.
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