PTC thermistors for
overcurrent protection
Leaded disks, uncoated, 380 to 1000 V
Series/Type:
Date:
B597**
September 2012
© EPCOS AG 2012. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
Overcurrent protection
Leaded disks, uncoated, 380 V to 1000 V
B750 ... B774
Applications
Overcurrent protection
Short circuit protection
Features
Lead-free terminals
Marking: Type, manufacturer's logo,
reference temperature in
°C
and date code
YYWW
UL approval to UL 1434 with V
max
= 420 V
and V
R
= 380 V (file number E69802),
except B758
VDE approval for selected types
(licence number 104843 E)
RoHS-compatible
Delivery mode
Cardboard strips (standard)
Cardboard tape reeled or in Ammo pack
on request
Dimensional drawing
Dimensions (mm)
Type
B750
B751
B752
B753
B754
B755
B758
B770
B771
B772
B773
B774
w
max
12.5
12.5
12.5
12.5
12.5
12.5
12.5
8.5
8.5
8.5
8.5
8.5
h
max
16.5
16.5
16.5
16.5
16.5
16.5
16.5
12.0
12.0
12.0
12.0
12.0
th
max
5.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
General technical data
Switching cycles
Operating temperature range
Operating temperature range
N
T
op
T
op
100
40/+125
20/+85
°C
°C
(V = 0)
(V = V
max
)
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 13
Overcurrent protection
Leaded disks, uncoated, 380 V to 1000 V
B750 ... B774
Electrical specifications and ordering codes
Type
I
R
I
S
I
Smax
t
S
(V = V
max
) (V
max
,
I
Smax
)
A
s
I
r
R
R
(typ.)
(V = V
max
)
mA
Ω
R
min
Approvals Ordering code
mA
mA
Ω
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
B59750B0120A070
B59751B0120A070
B59752B0120A070
B59753B0120A070
B59754B0120A070
B59770B0120A070
B59771B0120A070
B59772B0120A070
B59755B0115A070
B59774B0115A070
B59773B0120A070
B59758B0110A070
V
max
= 440 V, V
R
= 380 V, T
ref
= 120
°C, ∆R
R
=
±25
%
B750 123 245 4.0
<6
4.0
25
13
B751
87 173 4.0
<4
3.5
50
26
B752
69 137 4.0
<4
3.5
80
42
B753
56 112 4.0
<3
3.0
120
63
B754
50 100 4.0
<3
3.0
150
68
B770
64 127 2.8
<4
3.5
70
45
B771
49
97 2.8
<3
2.5
120
76
B772
43
86 2.8
<3
2.5
150
96
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
B774
16
32 1.0
<2
1.5
1100
700
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
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
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 13
Overcurrent protection
Leaded disks, uncoated, 380 V to 1000 V
B750 ... B774
Reliability data
Test
Electrical endurance,
cycling
Electrical endurance,
constant
Damp heat
Standard
IEC 60738-1
IEC 60738-1
IEC 60738-1
Test conditions
Room temperature, I
Smax
; V
max
Number of cycles: 100
Storage at V
max
/T
op,max
(V
max
)
Test duration: 1000 h
Temperature of air: 40
°C
Relative humidity of air: 93%
Duration: 56 days
Test according to IEC 60068-2-78
T
1
= T
op,min
(0 V), T
2
= T
op,max
(0 V)
Number of cycles: 5
Test duration: 30 min
Test according to IEC 60068-2-14, test Na
Frequency range: 10 to 55 Hz
Displacement amplitude: 0.75 mm
Test duration: 3
×
2 h
Test according to IEC 60068-2-6, test Fc
Acceleration: 390 m/s
2
Pulse duration: 6 ms; 6
×
4000 pulses
Dry heat: T = T
op,max
(0 V)
Test duration: 16 h
Damp heat first cycle
Cold: T = T
op,min
(0 V)
Test duration: 2 h
Damp heat 5 cycles
Tests performed according to
IEC 60068-2-30
∆R
25
/R
25
< 25%
< 25%
< 10%
Rapid change
of temperature
IEC 60738-1
< 10%
Vibration
IEC 60738-1
< 5%
Shock
Climatic sequence
IEC 60738-1
IEC 60738-1
< 5%
< 10%
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 4 of 13
Overcurrent protection
Leaded disks, uncoated, 380 V to 1000 V
B750 ... B774
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)
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 13
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