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EPCOS Product Brief 2018
SMD Varistors, CU Types for Surge Current Protection
SMD varistors, which are also
known as CU varistors, are ceramic
semiconductor components for
surge current protection in con-
sumer, industrial, automotive and
telecom applications. SMD varistors
are encapsulated components
designed for SMD mounting and
are electrically equivalent to the
SIOV-S05 leaded disk varistors (disk
diameter 5mm) in case size 3225
and SIOV-S07 (disk diameter 7mm)
in case size 4032.
The varistors cover a voltage range
from 14 to 385 V DC and are de-
signed for surge currents of between
100 and 1200 A at a standard pulse
of 8/20μs.
Depending on the type, a maximum
energy of between 300 and
23000mJ can be absorbed for
2ms. The components have a
maximum AC operating voltage of
up to 300 V
RMS
or respectively
385 V DC.
All CU varistors are RoHS-compa-
tible. Types with ≥130V
RMS
are
UL and CSA approved. They can be
operated at temperatures of up to
85°C without derating.
Features
SMD mountable varistors,
suitable for lead-free soldering
Bidirectional protection in a
single component
High surge current capability to
IEC 61000-4-5 for the telecom
series
Jump start and load dump
protection to ISO 7637, pulse 5
for automotive series
Construction
Disk varistor element with thermo-
plast encapsulation (ame-retardant
to UL 94 V-0) in case sizes 3225
and 4032.
SIOV Metal Oxide Varistors
2
© EPCOS AG 2017For further information please contact your EPCOS sales ofce.
SMD Varistors (CU Types)
General technical data
Operating temperature: –40/+85 °C
Storage temperature:
–40/+125 °C
Electrical specications and ordering codes
Maximum ratings (T
op, max
= 85 °C) Characteristics (T
A
= 25 °C)
Ordering code
Case size V
RMS
V
V
DC
V
i
max
(8/20 μs)
1 time
A
I
n
1)
(8/20 μs)
15 times
A
W
max
(2 ms)
mJ
P
max
mW
V
V
2)
(1 mA)
V
V
c,max
V
I
c
(8/20 µs)
A
B72650M0110K072 3225 11 14 100 50 300 10 18 36 1.0
B72660M0110K072 4032 11 14 250 100 800 20 18 36 2.5
B72650M0140K072 3225 14 18 100 50 400 10 22 43 1.0
B72660M0140K072 4032 14 18 250 100 900 20 22 43 2.5
B72650M0170K072 3225 17 22 100 50 500 10 27 53 1.0
B72660M0170K072 4032 17 22 250 100 1100 20 27 53 2.5
B72650M0200K072 3225 20 26 100 50 600 10 33 65 1.0
B72660M0200K072 4032 20 26 250 100 1300 20 33 65 2.5
B72650M0250K072 3225 25 31 100 50 700 10 39 77
1.0
B72660M0250K072 4032 25 31 250 100 1600 20 39 77 2.5
B72650M0300K072 3225 30 38 100 50 900 10 47 93 1.0
B72660M0300K072 4032 30 38 250 100 2000 20 47 93 2.5
B72650M0350K072 3225 35 45 100 50 1100 10 56 110 1.0
B72660M0350K072 4032 35 45 250 100 2500 20 56 110 2.5
B72650M0400K072 3225 40 56 100 50 1300 10 68 135 1.0
B72660M0400K072 4032 40 56 250 100 3000 20 68 135 2.5
B72650M0500K072 3225 50 65 400 150 1800 100 82 135 5.0
B72660M0500K072 4032 50 65 1200 500 4200 250 82 135 10.0
B72650M0600K072 3225 60 85 400 150 2200 100 100 165 5.0
B72660M0600K072 4032 60 85 1200 500 4800 250 100 165 10.0
B72650M0750K072 3225 75 100 400 150 2500 100 120 200 5.0
B72660M0750K072
4032 75 100 1200 500 5900 250 120 200 10.0
1)
Nominal discharge current I
n
according to UL 1449, 4
th
edition.
2)
∆V
V
= ±10%
Dimensional drawing
Dimensions
Chip size V
RMS
V
l
mm
w
mm
h
mm
3225 11 … 175 8.0 ±0.3 6.3 ±0.3 3.2 ±0.3
3225 230 … 300 8.0 ±0.3 6.3 ±0.3 4.5 ±0.3
4032 11 … 175 10.2 ±0.3 8.0 ±0.3 3.2 ±0.3
4032 230 … 300 10.2 ±0.3 8.0 ±0.3 4.5 ±0.3