149 04/02
Construction
■Cylindrical varistor element, encapsulated
■Encapsulation: thermoplast, flame-retardant to UL 94 V-0
■Termination: tinned copper alloy
Features
■High energy absorption, particularly in case of load dump
■Jump-start strength
■Stable protection level, minimum leakage current
■High resistance to cyclic temperature stress
■Good solderability
■Low inductance
■PSpice models
Taping
■Supply on 8/12-mm tape, for tape dimensions see pages 154/155,
for reel dimensions and packing units see page 157, chapter “SMD Varistors: Taping”
Type designation
Detailed description of coding system on page 39, chapter “General Technical Information”
Note: Contact EPCOS for consultancy if solvents on water-base are used for cleaning.
General technical data
Climatic category
LCT
UCT
Damp heat, steady state
(93 % r.h., 40 °C)
40/85/56
– 40
°C
+ 85
°C
56 days
in accordance with IEC 60068-1
in accordance with IEC 60068-2-3
Operating temperature – 40 … + 85 °C in accordance with CECC 42 000
Storage temperature – 40 … + 125 °C
Electric strength ³ 2,5 kVRMS in accordance with CECC 42 000
Insulation resistance ³ 1,0 GWin accordance with CECC 42 000
Response time < 10 ns
Solderability 235 °C, 2 s in accordance with IEC 60068-2-58
Resistance to soldering heat 260 °C, 10 s in accordance with IEC 60068-2-20
SIOV-CU 4032 K 14 AUTO G2
Design
Size (nominal)
Taping mode
Automotive varistor
Tolerance
of varistor voltage
Max. AC operating voltage
EPCOS metal oxide varistor
SMD Varistors
Monolithic; Automotive Series
150 04/02
Notes
■If the maximum loads specified for load dump and jump start are fully utilized, subsequent
polarity reversal of the AUTO varistors is inadmissible.
■If the load remains under the maximum ratings, polarity reversal may be admissible.
Contact EPCOS for consultancy on this kind of problem.
■Load dump or jump start can decrease the varistor voltage in load direction by max. 15 %.
■Load dump: min. time of energy input 40 ms, interval 60 s.
Maximum ratings (TA = 85 °C)
Type
SIOV-
Ordering code VRMS
V
VDC
V
imax
8/20 ms
A
Wmax
(2 ms)
J
Pmax
W
WLD
(10x)
J
12-V supply systems
CU3225K14AUTOG2 B72650M1140K072 14 16 100 0,4 0,01 6
CU4032K14AUTOG2 B72660M1140K072 14 16 250 0,9 0,02 12
CU3225K17AUTOG2 B72650M1170K072 17 20 100 0,5 0,01 6
CU4032K17AUTOG2 B72660M1170K072 17 20 250 1,1 0,02 12
24-V supply systems
CU3225K30AUTOG2 B72650M1300K072 30 34 100 0,9 0,01 6
CU4032K30AUTOG2 B72660M1300K072 30 34 250 2,0 0,02 12
Characteristics (TA = 25 °C)
Type
SIOV-
VJump
(5 min)
V
Vv
(1 mA)
V
DVv
(1 mA)
%
Max. clamping
voltage
Ctyp
(1 kHz)
nF
Derating
curve
Page
V/I char-
acteristic
Page
v
V
i
A
12-V supply systems
CU3225K14AUTOG2 25 22 ± 10 43 1,0 1,4 246 274
CU4032K14AUTOG2 25 22 ± 10 43 2,5 2,3 246 275
CU3225K17AUTOG2 30 27 ± 10 53 1,0 1,2 246 274
CU4032K17AUTOG2 30 27 ± 10 53 2,5 1,9 246 275
24-V supply systems
CU3225K30AUTOG2 50 47 ± 10 93 1,0 0,6 246 274
CU4032K30AUTOG2 50 47 ± 10 93 2,5 1,1 246 275
Monolithic; Automotive Series
SMD Varistors
151 04/02
Dimensions
Termination: tinned copper alloy
Type I
mm
b
mm
h
mm
SIOV-CU3225K14…30 8,0 ± 0,3 6,3 ± 0,3 3,2 ± 0,3
SIOV-CU4032K14…30 10,2 ± 0,3 8,0 ± 0,3 3,2 ± 0,3
Recommended solder pad layout
Type A
mm
B
mm
C
mm
D
mm
SIOV-CU3225K14…30 3,5 2,8 4,5 10,1
SIOV-CU4032K14…30 3,5 2,8 6,5 12,1
VAR0392-L
h
1,5±0,3
0,3 max.
b
h
3±0,3
Weight:
CU3225: approx. 0,5 g
CU4032: approx. 0,8 g
VAR0391-D
B B
C
D
A
A
Monolithic; Automotive Series
SMD Varistors
Herausgegeben von EPCOS AG
Unternehmenskommunikation, Postfach 80 17 09, 81617 München, DEUTSCHLAND
(
++49 89 636 09, FAX (0 89) 636-2 26 89
EPCOS AG 2002. Vervielfältigung, Veröffentlichung, Verbreitung und Verwertung dieser Broschüre und ihres Inhalts ohne aus-
drückliche Genehmigung der EPCOS AG nicht gestattet.
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troindustrie, soweit nichts anderes vereinbart wird.
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oder an unsere Vertriebsgesellschaften im Ausland. Bauelemente können aufgrund technischer Erfordernisse Gefahrstoffe ent-
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zuholen.
Published by EPCOS AG
Corporate Communications, P.O. Box 80 17 09, 81617 Munich, GERMANY
(
++49 89 636 09, FAX (0 89) 636-2 26 89
EPCOS AG 2002. Reproduction, publication and dissemination of this brochure and the information contained therein without
EPCOS’ prior express consent is prohibited.
Purchase orders are subject to the General Conditions for the Supply of Products and Services of the Electrical and Electronics
Industry recommended by the ZVEI (German Electrical and Electronic Manufacturers’ Association), unless otherwise agreed.
This brochure replaces the previous edition.
For questions on technology, prices and delivery please contact the Sales Offices of EPCOS AG or the international Representa-
tives.
Due to technical requirements components may contain dangerous substances. For information on the type in question please
also contact one of our Sales Offices.
