SIOV metal oxide varistors
Housed (ThermoFuse) varistors, AdvanceD series
Series/Type: ETFV20
Date: April 2011
© EPCOS AG 2015. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
Construction
Round varistor element, leaded
Coating: epoxy resin, flame-retardant to UL 94 V-0
Terminals: tinned copper wire, metal compound wire
Housing: thermoplastic, flame-retardant to UL 94 V-0
Features
Wide operating voltage range 130 … 420 VRMS
Self-protected under abnormal overvoltage conditions
High-energy AdvanceD series E2
Approvals
UL
IEC
VDE
Applications
Air conditioner, refrigerator, TV, etc.
Power meter, inverter, telecom equipment, etc.
Transient voltage surge suppressors (TVSS)
Solar inverter
Delivery mode
Bulk (standard)
Typical applications
General technical data
Climatic category to IEC 60068-1 40/85/56
Operating temperature to IEC 61051 40 ... + 85 °C
Storage temperature 40 ... + 85 °C
Electric strength to IEC 61051 ≥2.5 kVRMS
Insulation resistance to IEC 61051 ≥100 MΩ
Response time < 25 ns
Housed varistors ETFV20
ThermoFuse varistors, ETFV20 series
Page 2 of 15Please read Cautions and warnings and
Important notes at the end of this document.
Electrical specifications and ordering codes
Maximum ratings (TA=85°C)
Ordering code Type
(untaped)
SIOV-
VRMS
V
VDC
V
imax
(8/20 µs)
A
Wmax
(2 ms)
J
Pmax
W
B72220T2131K101 ETFV20K130E2 130 170 10000 100 1.0
B72220T2141K101 ETFV20K140E2 140 180 10000 110 1.0
B72220T2151K101 ETFV20K150E2 150 200 10000 120 1.0
B72220T2171K101 ETFV20K175E2 175 225 10000 135 1.0
B72220T2211K101 ETFV20K210E2 210 270 10000 160 1.0
B72220T2231K101 ETFV20K230E2 230 300 10000 180 1.0
B72220T2251K101 ETFV20K250E2 250 320 10000 195 1.0
B72220T2271K101 ETFV20K275E2 275 350 10000 215 1.0
B72220T2301K101 ETFV20K300E2 300 385 10000 250 1.0
B72220T2321K101 ETFV20K320E2 320 420 10000 273 1.0
B72220T2351K101 ETFV20K350E2 350 460 10000 273 1.0
B72220T2381K101 ETFV20K385E2 385 505 10000 273 1.0
B72220T2421K101 ETFV20K420E2 420 560 10000 273 1.0
Characteristics (TA=25°C)
Ordering code Type
(untaped)
SIOV-
Vv
(1 mA)
V
∆Vv
(1 mA)
%
vc,max
(ic)
V
ic
A
Ctyp
(1 kHz)
pF
B72220T2131K101 ETFV20K130E2 205 ±10 340 100 1340
B72220T2141K101 ETFV20K140E2 220 ±10 360 100 1240
B72220T2151K101 ETFV20K150E2 240 ±10 395 100 1160
B72220T2171K101 ETFV20K175E2 270 ±10 455 100 1000
B72220T2211K101 ETFV20K210E2 330 ±10 545 100 835
B72220T2231K101 ETFV20K230E2 360 ±10 595 100 760
B72220T2251K101 ETFV20K250E2 390 ±10 650 100 700
B72220T2271K101 ETFV20K275E2 430 ±10 710 100 630
B72220T2301K101 ETFV20K300E2 470 ±10 775 100 580
B72220T2321K101 ETFV20K320E2 510 ±10 840 100 540
B72220T2351K101 ETFV20K350E2 560 ±10 910 100 500
B72220T2381K101 ETFV20K385E2 620 ±10 1025 100 450
B72220T2421K101 ETFV20K420E2 680 ±10 1120 100 420
Housed varistors ETFV20
ThermoFuse varistors, ETFV20 series
Page 3 of 15Please read Cautions and warnings and
Important notes at the end of this document.
Dimensional drawings
Lead configuration
Weight
Nominal diameter
mm
VRMS
V
Weight
g
20 130 ... 420 5.2 ... 8.4
Housed varistors ETFV20
ThermoFuse varistors, ETFV20 series
Page 4 of 15Please read Cautions and warnings and
Important notes at the end of this document.
Reliability data
Test Test methods/conditions Requirement
Varistor voltage The voltage between two terminals with
the specified measuring current applied
is called VV(1 mADC @ 0.2 ... 2 s).
To meet the specified value
Clamping voltage The maximum voltage between two
terminals with the specified standard
impulse current (8/20 µs) applied.
To meet the specified value
Endurance at upper
category temperature
1000 h at UCT
After having continuously applied the
maximum allowable AC voltage at UCT
±2°C for 1000 h, the specimen shall be
stored at room temperature and normal
humidity for 1 to 2 h.
Thereafter, the change of VVshall be
measured.
|∆V/V (1 mA)| ≤10%
Surge current derating,
8/20 µs
10 surge currents (8/20 µs), unipolar,
interval 30 s, amplitude corresponding
to derating curve for 10 impulses at
20 µs
|∆V/V (1 mA)| ≤10%
(measured in direction of
surge current)
No visible damage
Surge current derating,
2 ms
10 surge currents (2 ms), unipolar,
interval 120 s, amplitude corresponding
to derating curve for 10 impulses at
2 ms
|∆V/V (1 mA)| ≤10%
(measured in direction of
surge current)
No visible damage
Electric strength IEC 61051-1, test 4.9.2
Metal balls method, 2500 VRMS, 60 s
The varistor is placed in a container
holding 1.6 ±0.2 mm diameter metal
balls such that only the terminations of
the varistor are protruding.
The specified voltage shall be applied
between both terminals of the specimen
connected together and the electrode
inserted between the metal balls.
No breakdown
Housed varistors ETFV20
ThermoFuse varistors, ETFV20 series
Page 5 of 15Please read Cautions and warnings and
Important notes at the end of this document.
Test Test methods/conditions Requirement
Climatic sequence The specimen shall be subjected to:
a) dry heat at UCT, 16 h, IEC
60068-2-2, test Ba
b) damp heat, 1st cycle:
55 °C, 93% r. H., 24 h, IEC
60068-2-30, test Db
c) cold, LCT, 2 h, IEC 60068-2-1, test
Aa
d) damp heat, additional 5 cycles:
55 °C/25 °C, 93% r. H., 24 h/cycle,
IEC 60068-2-30, test Db.
Then the specimen shall be stored at
room temperature and normal humidity
for 1 to 2 h.
Thereafter, the change of VVshall be
measured. Thereafter, insulation resis-
tance Rins shall be measured at V = 500
V.
|∆V/V (1 mA)| ≤10%
Rins ≥100 MΩ
Rapid change of
temperature
IEC 60068-2-14, test Na, LCT/UCT,
dwell time 30 min, 5 cycles
|∆V/V (1 mA)| ≤5%
No visible damage
Damp heat, steady state IEC 60068-2-78, test Ca
The specimen shall be subjected to
40 ±2°C, 90 to 95% r. H. for 56 days
without load / with 10% of the maxi-
mum continuous DC operating voltage
VDC. Then stored at room temperature
and normal humidity for 1 to 2 h.
Thereafter, the change of VVshall be
measured. Thereafter, insulation resis-
tance Rins shall be measured at V = 500
V (insulated varistors only).
|∆V/V (1 mA)| ≤10%
Rins ≥100 MΩ
Housed varistors ETFV20
ThermoFuse varistors, ETFV20 series
Page 6 of 15Please read Cautions and warnings and
Important notes at the end of this document.
Test Test methods/conditions Requirement
Solderability IEC 60068-2-20, test Ta,
method 1 with modified conditions for
lead-free solder alloys: 245 °C, 3 s:
After dipping the terminals to a depth of
approximately 3 mm from the body in a
soldering bath of 245 °C for 3 s, the
terminals shall be visually examined.
The inspection shall be
carried out under adequate
light with normal eyesight or
with the assistance of a
magnifier capable of giving
a magnification of 4 to
10 times. The dipped
surface shall be covered
with a smooth and bright
solder coating with no more
than small amounts of
scattered imperfections
such as pinholes or
un-wetted or de-wetted
areas. These imperfections
shall not be concentrated in
one area.
Resistance to soldering
heat
IEC 60068-2-20, test Tb, method 1A,
260 °C, 10 s:
Each lead shall be dipped into a solder
bath having a temperature of 260 ±5°C
to a point 2.0 to 2.5 mm from the body
of the specimen, be held there for
10 ±1 s and then be stored at room
temperature and normal humidity for
1 to 2 h.
The change of VVshall be measured
and the specimen shall be visually
examined.
|∆V/V (1 mA)| ≤5%
No visible damage
Tensile strength IEC 60068-2-21, test Ua1
After gradually applying the force
specified below and keeping the unit
fixed for 10 s, the terminal shall be
visually examined for any damage.
Force for wire diameter:
0.6 mm = 10 N
0.8 mm = 10 N
1.0 mm = 20 N
|∆V/V (1 mA)| ≤5%
No break of solder joint,
no wire break
Housed varistors ETFV20
ThermoFuse varistors, ETFV20 series
Page 7 of 15Please read Cautions and warnings and
Important notes at the end of this document.
Test Test methods/conditions Requirement
Vibration IEC 60068-2-6, test Fc, method B4 |∆V/V (1 mA)| ≤5%
No visible damage
Frequency range:
Amplitude:
Duration:
Pulse:
10 … 55 Hz
0.75 mm or 98 m/s2
6h(3·2h)
sine wave
After repeatedly applying a single
harmonic vibration according to the
table above.
The change of VVshall be measured
and the specimen shall be visually
examined.
Bump IEC 60068-2-29, test Eb |∆V/V (1 mA)| ≤5%
No visible damage
Pulse duration:
Max. acceleration:
Number of bumps:
Pulse:
6 ms
400 m/s2
4000
half sine
Fire hazard IEC 60695-11-5 (needle flame test)
Severity: vertical 10 s
5 s max.
Housed varistors ETFV20
ThermoFuse varistors, ETFV20 series
Page 8 of 15Please read Cautions and warnings and
Important notes at the end of this document.
Test Test methods/conditions Requirement
Abnormal overvoltage test The device is designed to meet the
limited current abnormal overvoltage
condition, outlined in section 39.4 of UL
1449, 3rd edition.
Detailed test voltage applied onto the
device for different types as in the
following table:
Type Device
rating
V
Test
voltage
V
ETFV20K130E2 130 260
ETFV20K140E2 140 280
ETFV20K150E2 150 300
ETFV20K175E2 175 350
ETFV20K210E2 210 420
ETFV20K230E2 230 415
ETFV20K250E2 250 500
ETFV20K275E2 275 480
ETFV20K300E2 300 600
ETFV20K320E2 320 600
ETFV20K350E2 350 600
ETFV20K385E2 385 600
ETFV20K420E2 420 600
Any of these phenomena
shall not be observed, or
this specimen will be judged
as failed part:
1. Emission of flame, molten
metal, glowing or flaming
particles through any
openings (pre-existed or
created as a result of the
test) in the product.
2. Charring, glowing, or
flaming of the supporting
surface, tissue paper, or
cheesecloth.
3. Ignition of the enclosure.
4. Creation of any openings
in the enclosure that
result in accessibility of
live parts, when
evaluated in accordance
with accessibility of live
parts test in section 58.2
of UL1449, 3rd edition.
Note:
UCT = Upper category temperature
LCT = Lower category temperature
Rins = Insulation resistance
Housed varistors ETFV20
ThermoFuse varistors, ETFV20 series
Page 9 of 15Please read Cautions and warnings and
Important notes at the end of this document.
v/i characteristics
v = f (i) for explanation of the characteristics refer to "General technical information", chapter 1.6.3
A = Leakage current, B = Protection level } for worst-case varistor tolerances
SIOV-ETFV20 ... E2
Housed varistors ETFV20
ThermoFuse varistors, ETFV20 series
Page 10 of 15Please read Cautions and warnings and
Important notes at the end of this document.
Derating curves
Maximum surge current imax = f (tr, pulse train)
For explanation of the derating curves refer to "General technical information", section 1.8.1
SIOV-ETFV20 ... E2
Housed varistors ETFV20
ThermoFuse varistors, ETFV20 series
Page 11 of 15Please read Cautions and warnings and
Important notes at the end of this document.
Cautions and warnings
General
1. EPCOS metal oxide varistors are designed for specific applications and should not be used
for purposes not identified in our specifications, application notes and data books unless oth-
erwise agreed with EPCOS during the design-in-phase.
2. Ensure suitability of SIOVs through reliability testing during the design-in phase. SIOVs
should be evaluated taking into consideration worst-case conditions.
3. For applications of SIOVs in line-to-ground circuits based on various international and local
standards there are restrictions existing or additional safety measures required.
Storage
1. Store SIOVs only in original packaging. Do not open the package before storage.
2. Storage conditions in original packaging:
Storage temperature: 25 °C ... +45 °C,
Relative humidity: <75% annual average,
<95% on maximum 30 days a year.
Dew precipitation: is to be avoided.
3. Avoid contamination of an SIOV's during storage, handling and processing.
4. Avoid storage of SIOVs in harmful environments that can affect the function during long-term
operation (examples given under operation precautions).
5. The SIOV type series should be soldered within the time specified:
SIOV-S, -Q, -LS, -B, -SFS 24 months
ETFV 12 months.
Handling
1. SIOVs must not be dropped.
2. Components must not be touched with bare hands. Gloves are recommended.
3. Avoid contamination of the surface of SIOV electrodes during handling, be careful of the
sharp edge of SIOV electrodes.
Soldering (where applicable)
1. Use rosin-type flux or non-activated flux.
2. Insufficient preheating may cause ceramic cracks.
3. Rapid cooling by dipping in solvent is not recommended.
4. Complete removal of flux is recommended.
Housed varistors ETFV20
ThermoFuse varistors, ETFV20 series
Page 12 of 15Please read Cautions and warnings and
Important notes at the end of this document.
Mounting
1. Potting, sealing or adhesive compounds can produce chemical reactions in the SIOV ceramic
that will degrade the component’s electrical characteristics.
2. Overloading SIOVs may result in ruptured packages and expulsion of hot materials. For this
reason SIOVs should be physically shielded from adjacent components.
Operation
1. Use SIOVs only within the specified temperature operating range.
2. Use SIOVs only within the specified voltage and current ranges.
3. Environmental conditions must not harm SIOVs. Use SIOVs only in normal atmospheric con-
ditions. Avoid use in deoxidizing gases (chlorine gas, hydrogen sulfide gas, ammonia gas,
sulfuric acid gas etc), corrosive agents, humid or salty conditions.Contact with any liquids and
solvents should be prevented.
Housed varistors ETFV20
ThermoFuse varistors, ETFV20 series
Page 13 of 15Please read Cautions and warnings and
Important notes at the end of this document.
Symbols and terms
Symbol Term
C Capacitance
Ctyp Typical capacitance
i Current
icCurrent at which Vc, max is measured
Ileak Leakage current
imax Maximum surge current (also termed peak current)
Imax Maximum discharge current to IEC 61643-1
Inom Nominal discharge current to IEC 61643-1
LCT Lower category temperature
Ltyp Typical inductance
Pmax Maximum average power dissipation
Rins Insulation resistance
Rmin Minimum resistance
TAAmbient temperature
trDuration of equivalent rectangular wave
UCT Upper category temperature
v Voltage
Vclamp Clamping voltage
vc, max Maximum clamping voltage at specified current ic
VDC DC operating voltage
Vjump Maximum jump start voltage
vmax Maximum voltage
Vop Operating voltage
VRMS AC operating voltage, root-mean-square value
VRMS, op, max Root-mean-square value of max. DC operating voltage incl. ripple current
Vsurge Super imposed surge voltage
VVVaristor voltage
∆VVTolerance of varistor voltage
WLD Maximum load dump
Wmax Maximum energy absorption
Lead spacing
All dimensions are given in mm.
The commas used in numerical values denote decimal points.
Housed varistors ETFV20
ThermoFuse varistors, ETFV20 series
Page 14 of 15Please read Cautions and warnings and
Important notes at the end of this document.
The following applies to all products named in this publication:
1. Some parts of this publication contain statements about the suitability of our products for
certain areas of application. These statements are based on our knowledge of typical re-
quirements that are often placed on our products in the areas of application concerned. We
nevertheless expressly point out that such statements cannot be regarded as binding
statements about the suitability of our products for a particular customer application.
As a rule, EPCOS is either unfamiliar with individual customer applications or less familiar
with them than the customers themselves. For these reasons, it is always ultimately incum-
bent on the customer to check and decide whether an EPCOS product with the properties de-
scribed in the product specification is suitable for use in a particular customer application.
2. We also point out that in individual cases, a malfunction of electronic components or
failure before the end of their usual service life cannot be completely ruled out in the
current state of the art, even if they are operated as specified. In customer applications
requiring a very high level of operational safety and especially in customer applications in
which the malfunction or failure of an electronic component could endanger human life or
health (e.g. in accident prevention or lifesaving systems), it must therefore be ensured by
means of suitable design of the customer application or other action taken by the customer
(e.g. installation of protective circuitry or redundancy) that no injury or damage is sustained by
third parties in the event of malfunction or failure of an electronic component.
3. The warnings, cautions and product-specific notes must be observed.
4. In order to satisfy certain technical requirements, some of the products described in this
publication may contain substances subject to restrictions in certain jurisdictions (e.g.
because they are classed as hazardous). Useful information on this will be found in our Ma-
terial Data Sheets on the Internet (www.epcos.com/material). Should you have any more de-
tailed questions, please contact our sales offices.
5. We constantly strive to improve our products. Consequently, the products described in this
publication may change from time to time. The same is true of the corresponding product
specifications. Please check therefore to what extent product descriptions and specifications
contained in this publication are still applicable before or when you place an order. We also
reserve the right to discontinue production and delivery of products. Consequently, we
cannot guarantee that all products named in this publication will always be available. The
aforementioned does not apply in the case of individual agreements deviating from the fore-
going for customer-specific products.
6. Unless otherwise agreed in individual contracts, all orders are subject to the current ver-
sion of the "General Terms of Delivery for Products and Services in the Electrical In-
dustry" published by the German Electrical and Electronics Industry Association
(ZVEI).
7. The trade names EPCOS, BAOKE, Alu-X, CeraDiode, CSMP, CSSP, CTVS, DeltaCap,
DigiSiMic, DSSP, FormFit, MiniBlue, MiniCell, MKK, MKD, MLSC, MotorCap, PCC,
PhaseCap, PhaseCube, PhaseMod, PhiCap, SIFERRIT, SIFI, SIKOREL, SilverCap,
SIMDAD, SiMic, SIMID, SineFormer, SIOV, SIP5D, SIP5K, ThermoFuse, WindCap are trade-
marks registered or pending in Europe and in other countries. Further information will be
found on the Internet at www.epcos.com/trademarks.
Important notes
Page 15 of 15
