Ceramic transient voltage suppressors
SMD multilayer transient voltage suppressors for
telecom applications
Series/Type:
Date:
November 2010
© EPCOS AG 2010. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
Multilayer varistors (MLVs)
Telecom series
EPCOS type designation system for telecom series
CT
Construction:
CT Single chip with nickel
barrier termination (AgNiSn)
Case size:
1812
Tolerance for the varistor voltage:
K Standard tolerance :
±10%
S Special tolerance
Maximum RMS operating voltage (V
RMS
):
60 60 V
75 75 V
95 95 V
115 115 V
Special tolerance for the varistor voltage:
Standard tolerance
A Special tolerance
Telecom series
Taping mode:
G2 Taped, 330-mm reel, 13''
1812
K
75
TELE
G2
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 30
Multilayer varistors (MLVs)
Telecom series
Features
High surge voltage capability up to 2 kV for
10/700 µs (acc. to German telecom administration
standards)
High surge load capability acc. to IEC 61000-4-5
Matched to line conditions with or without
superimposed ringing voltages
RoHS-compatible
Suitable for lead-free soldering
PSpice models available
Applications
Transient protection for:
Line cards in switching exchange systems
Terminal devices such as telephones, fax,
modems
xDSL, PBX, DECT lines
Design
Multilayer technology
Lack of plastic or epoxy encapsulation for
flammability rating better than UL 94 V-0
Termination (see “Soldering directions”):
CT types with nickel barrier terminations (AgNiSn),
recommended for lead-free reflow and wave
soldering, and compatible with tin/lead solder.
V/I characteristics and derating curves
V/I and derating curves are attached to the data sheet.
The curves are sorted by V
RMS
and then by case size,
which is included in the type designation.
General technical data
Maximum RMS operating voltage
Maximum DC operating voltage
Maximum surge current
Maximum clamping voltage
Operating temperature
Storage temperature
Single chip
Internal circuit
Available case size:
EIA
1812
Metric
4532
V
RMS,max
V
DC,max
(10 pulses, 10/700 µs) I
surge,max
(8/20 µs)
V
clamp,max
T
op
LCT/UCT
60 ... 115
85 ... 150
45
200 ... 360
40/+85
40/+125
V
V
A
V
°C
°C
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 30
Multilayer varistors (MLVs)
Telecom series
Temperature derating
Climatic category:
40/+85
°C
Electrical specifications and ordering codes
Maximum ratings (T
op,max
= 85
°C)
Type
Ordering code
V
RMS,max
V
DC,max
I
surge,max
(10 pulses,
10/700 µs)
V
V
A
60
85
45
75
100
45
95
125
45
115
150
45
I
surge,max
W
max
P
diss,max
(8/20 µs) (2 ms) (2 ms)
A
400
400
250
250
mJ
2200
2500
2800
3200
mW
15
15
15
15
CT1812S60AG2
CT1812K75TELEG2
CT1812S95AG2
CT1812K115TELEG2
B72580T0600S172
B72580T6750K072
B72580T0950S172
B72580T6111K072
Characteristics (T
A
= 25
°C)
Type
V
V
(1 mA)
V
100
120
150
180
∆V
V
%
+19/ 1
±10
+20/0
±10
V
clamp,max
V
200
250
270
360
I
clamp
(8/20 µs)
A
45
45
45
45
C
typ
(1 kHz, 1 V)
pF
400
320
250
200
CT1812S60AG2
CT1812K75TELEG2
CT1812S95AG2
CT1812K115TELEG2
Notes
In addition to the telecom varistors listed above, all varistors of the standard series can be used
for telecom applications if the selection criteria are considered.
These telecom varistors in multilayer technology are not suitable for the operation on AC
mains.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 4 of 30
Multilayer varistors (MLVs)
Telecom series
Dimensional drawing
Dimensions in mm
Case size
EIA / mm
l
w
h
k
1812 / 4532 4.5
±0.40
3.20
±0.30
2.5 max. 0.25 ... 1.00
Recommended solder pad layout
Dimensions in mm
Case size
EIA / mm
1812 / 4532
A
3.60
B
1.50
C
3.00
Delivery mode
EIA case size Taping
1812
1812
1812
1812
Blister
Blister
Blister
Blister
Reel size
mm
330
330
330
330
Packing unit
pcs.
4000
3000
3000
4000
Type
CT1812K75TELEG2
CT1812K115TELEG2
CT1812S95AG2
CT1812S60AG2
Ordering code
B72580T6750K072
B72580T6111K072
B72580T0950S172
B72580T0600S172
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 30
