PTC thermistors for overcurrent
protection
Leaded disks, uncoated,
380 to 1000 V
Series/Type:
B597**
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, date code and type
designation stamped on in black
UL approval to UL 1434 with V
max
= 420 V
and V
R
= 380 V (file number E69802),
except B758
RoHS-compatible
Delivery mode
Cardboard strips (standard)
Cardboard tape reeled or in Ammo pack
on request
Dimensional drawing
Dimensions (mm)
Type
b
max
h
max
s
max
B750
12.5
16.5
7.0
B751
12.5
16.5
7.0
B752
12.5
16.5
7.0
B753
12.5
16.5
7.0
B754
12.5
16.5
7.0
B755
12.5
16.5
7.0
B758
12.5
16.5
7.0
B770
8.5
12.0
7.0
B771
8.5
12.0
7.0
B772
8.5
12.0
7.0
B773
8.5
12.0
7.0
B774
8.5
12.0
7.0
General technical data
Switching cycles
N
100
Operating temperature range
(V = 0)
T
op
40/+125
C
Operating temperature range
(V = V
max
)
T
op
0/+60
C
Overcurrent protection
Leaded disks, uncoated, 380 V to 1000 V
B750 ... B774
Page 2 of 10
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
t
s
(V
max
,
I
Smax
)
s
I
r
(V = V
max
)
typ.
mA
R
R
R
min
Ordering code
V
max
= 420 V , V
R
= 380 V , T
ref
= 120
C ,
R
R
=
25 %
B750
123
245
2.0
< 6
4.0
25
13
B59750B0120A070
B751
87
173
2.0
< 4
3.5
50
26
B59751B0120A070
B752
69
137
2.0
< 4
3.5
80
42
B59752B0120A070
B753
56
112
2.0
< 3
3.0
120
63
B59753B0120A070
B754
50
100
2.0
< 3
3.0
150
68
B59754B0120A070
B770
64
127
1.4
< 4
3.5
70
45
B59770B0120A070
B771
49
97
1.4
< 3
2.5
120
76
B59771B0120A070
B772
43
86
1.4
< 3
2.5
150
96
B59772B0120A070
V
max
= 550 V , V
R
= 500 V , T
ref
= 115
C ,
R
R
=
25 %
B755
28
55
1.4
< 3
2.0
500
230
B59755B0115A070
B774
16
32
1.0
< 2
1.5
1100
700
B59774B0115A070
V
max
= 550 V , V
R
= 500 V , T
ref
= 120
C ,
R
R
=
25 %
B773
24
48
1.0
< 3
2.0
500
320
B59773B0120A070
V
max
= 1000 V , V
R
= 1000 V , T
ref
= 110
C ,
R
R
=
33 %
B758
8
17
0.5
< 3
3.0
7500
3380
B59758B0110A070
Overcurrent protection
Leaded disks, uncoated, 380 V to 1000 V
B750 ... B774
Page 3 of 10
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, uncoated, 380 V to 1000 V
B750 ... B774
Page 4 of 10
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, uncoated, 380 V to 1000 V
B750 ... B774
Page 5 of 10
Please read Important notes and
Cautions and warnings at the end of this document.
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