constant
Damp heatIEC 60738-1Temperature of air: 40 °C
IEC 60738-1Room temperature, I
Number of cycles: 100
IEC 60738-1Storage at V
max/Top,max(Vmax
Test duration: 1000 h
Smax
; V
max
< 25%
)
< 25%
< 10%
Relative humidity of air: 93%
Duration: 56 days
Test according to IEC 60068-2-78
Rapid change
of temperature
IEC 60738-1T1= T
Number of cycles: 5
(0 V), T2= T
op,min
op,max
(0 V)
< 10%
Test duration: 30 min
Test according to IEC 60068-2-14, Test Na
VibrationIEC 60738-1Frequency range: 10 to 55 Hz
< 5%
Displacement amplitude: 0.75 mm
Test duration: 3 × 2 h
Test according to IEC 60068-2-6, Test Fc
ShockIEC 60738-1Acceleration: 390 m/s
2
< 5%
Pulse duration: 6 ms; 6 × 4000 pulses
Climatic sequenceIEC 60738-1Dry heat: T = T
op,max
(0 V)
< 10%
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
25
Important notes at the end of this document.
Page 4 of 16Please read Cautions and warnings and
Page 5
Overcurrent protection
Leaded disks, coated, 230 VC810 ... C890
Characteristics (typical) for T
PTC resistance R
PTC temperature T
PTC
versus
PTC
= 80 °C
ref
(measured at low signal voltage)
Switching time tSversus switching current I
(measured at 25 °C in still air)
PTC current I
versus PTC voltage V
PTC
(measured at 25 °C in still air)
Rated current IRversus ambient temperature T
S
(measured in still air)
PTC
A
Important notes at the end of this document.
Page 5 of 16Please read Cautions and warnings and
Page 6
Overcurrent protection
Leaded disks, coated, 230 VC810 ... C890
Characteristics (typical) for T
PTC resistance R
PTC temperature T
PTC
versus
PTC
= 80 °C
ref
(measured at low signal voltage)
Switching time tSversus switching current I
(measured at 25 °C in still air)
PTC current I
versus PTC voltage V
PTC
(measured at 25 °C in still air)
Rated current IRversus ambient temperature T
S
(measured in still air)
PTC
A
Important notes at the end of this document.
Page 6 of 16Please read Cautions and warnings and
Page 7
Overcurrent protection
Leaded disks, coated, 230 VC810 ... C890
Characteristics (typical) for T
PTC resistance R
PTC temperature T
PTC
versus
PTC
= 120 °C
ref
(measured at low signal voltage)
Switching time tSversus switching current I
(measured at 25 °C in still air)
PTC current I
versus PTC voltage V
PTC
(measured at 25 °C in still air)
Rated current IRversus ambient temperature T
S
(measured in still air)
PTC
A
Important notes at the end of this document.
Page 7 of 16Please read Cautions and warnings and
Page 8
Overcurrent protection
Leaded disks, coated, 230 VC810 ... C890
Characteristics (typical) for T
PTC resistance R
PTC temperature T
PTC
versus
PTC
= 120 °C
ref
(measured at low signal voltage)
Switching time tSversus switching current I
(measured at 25 °C in still air)
PTC current I
versus PTC voltage V
PTC
(measured at 25 °C in still air)
Rated current IRversus ambient temperature T
S
(measured in still air)
PTC
A
Important notes at the end of this document.
Page 8 of 16Please read Cautions and warnings and
Page 9
Overcurrent protection
Leaded disks, coated, 230 VC810 ... C890
Characteristics (typical) for T
PTC resistance R
PTC temperature T
PTC
versus
PTC
= 120 °C
ref
(measured at low signal voltage)
Switching time tSversus switching current I
(measured at 25 °C in still air)
PTC current I
versus PTC voltage V
PTC
(measured at 25 °C in still air)
Rated current IRversus ambient temperature T
S
(measured in still air)
PTC
A
Important notes at the end of this document.
Page 9 of 16Please read Cautions and warnings and
Page 10
Overcurrent protection
Leaded disks, coated, 230 VC810 ... C890
Characteristics (typical) for T
PTC resistance R
PTC temperature T
PTC
versus
PTC
= 130 °C
ref
(measured at low signal voltage)
Switching time tSversus switching current I
(measured at 25 °C in still air)
PTC current I
versus PTC voltage V
PTC
(measured at 25 °C in still air)
Rated current IRversus ambient temperature T
S
(measured in still air)
PTC
A
Important notes at the end of this document.
Page 10 of 16Please read Cautions and warnings and
Page 11
Overcurrent protection
Leaded disks, coated, 230 VC810 ... C890
Characteristics (typical) for T
PTC resistance R
PTC temperature T
PTC
versus
PTC
= 130 °C
ref
(measured at low signal voltage)
Switching time tSversus switching current I
(measured at 25 °C in still air)
PTC current I
versus PTC voltage V
PTC
(measured at 25 °C in still air)
Rated current IRversus ambient temperature T
S
(measured in still air)
PTC
A
Important notes at the end of this document.
Page 11 of 16Please read Cautions and warnings and
Page 12
Overcurrent protection
Leaded disks, coated, 230 VC810 ... C890
Cautions and warnings
General
EPCOS thermistors are designed for specific applications and should not be used for purposes
not identified in our specifications, application notes and data books unless otherwise agreed
with EPCOS during the design-in-phase.
Ensure suitability of thermistor through reliability testing during the design-in phase. The thermistors should be evaluated taking into consideration worst-case conditions.
Storage
Store thermistors only in original packaging. Do not open the package before storage.
Storage conditions in original packaging: storage temperature 25 °C ... +45 °C, relative humidity ≤75% annual mean, maximum 95%, dew precipitation is inadmissible.
Avoid contamination of thermistors surface during storage, handling and processing.
Avoid storage of thermistor in harmful environment with effect on function on long-term operation (examples given under operation precautions).
Use thermistor within 6 months after delivery.
Handling
PTCs must not be dropped. Chip-offs must not be caused during handling of PTCs.
Components must not be touched with bare hands. Gloves are recommended.
Avoid contamination of thermistor surface during handling.
Soldering (where applicable)
Use rosin-type flux or non-activated flux.
Insufficient preheating may cause ceramic cracks.
Rapid cooling by dipping in solvent is not recommended.
Complete removal of flux is recommended.
Standard PTC heaters are not suitable for soldering.
Important notes at the end of this document.
Page 12 of 16Please read Cautions and warnings and
Page 13
Overcurrent protection
Leaded disks, coated, 230 VC810 ... C890
Mounting
Electrode must not be scratched before/during/after the mounting process.
Contacts and housing used for assembly with thermistor have to be clean before mounting. Especially grease or oil must be removed.
When PTC thermistors are encapsulated with sealing material, the precautions given in chapter
"Mounting instructions", "Sealing and potting" must be observed.
When the thermistor is mounted, there must not be any foreign body between the electrode of
the thermistor and the clamping contact.
The minimum force of the clamping contacts pressing against the PTC must be 10 N.
During operation, the thermistor’s surface temperature can be very high. Ensure that adjacent
components are placed at a sufficient distance from the thermistor to allow for proper cooling at
the thermistors.
Ensure that adjacent materials are designed for operation at temperatures comparable to the
surface temperature of thermistor. Be sure that surrounding parts and materials can withstand
this temperature.
Avoid contamination of thermistor surface during processing.
Operation
Use thermistors only within the specified temperature operating range.
Use thermistors only within the specified voltage and current ranges.
Environmental conditions must not harm the thermistors. Use thermistors only in normal atmospheric conditions. 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.
Be sure to provide an appropriate fail-safe function to prevent secondary product damage
caused by abnormal function (e.g. use VDR for limitation of overvoltage condition).
Important notes at the end of this document.
Page 13 of 16Please read Cautions and warnings and
Page 14
Overcurrent protection
Leaded disks, coated, 230 VC810 ... C890
Symbols and terms
AArea
C
th
Heat capacity
fFrequency
ICurrent
I
I
I
I
I
I
I
I
I
max
R
PTC
r
r,oil
r,air
RMS
S
Smax
Maximum current
Rated current
PTC current
Residual currrent
Residual currrent in oil (for level sensors)
Residual currrent in air (for level sensors)
Root-mean-square value of current
Switching current
Maximum switching current
LCTLower category temperature
NNumber (integer)
N
c
N
f
Operating cycles at V
Switching cycles at V
, charging of capacitor
max
, failure mode
max
PPower
P
25
P
el
P
diss
R
min
R
R
∆R
R
P
R
PTC
R
ref
R
S
R
25
R
25,match
∆R
R
25
Maximum power at 25 °C
Electrical power
Dissipation power
Minimum resistance
Rated resistance
Tolerance of R
R
Parallel resistance
PTC resistance
Reference resistance
Series resistance
Resistance at 25 °C
Resistance matching per reel/ packing unit at 25 °C
Tolerance of R
25
TTemperature
tTime
T
A
t
a
T
C
Ambient temperature
Thermal threshold time
Ferroelectric Curie temperature
Important notes at the end of this document.
Page 14 of 16Please read Cautions and warnings and
Page 15
Overcurrent protection
Leaded disks, coated, 230 VC810 ... C890
t
E
T
R
T
sense
T
op
T
PTC
t
R
T
ref
T
Rmin
t
S
T
surf
Settling time (for level sensors)
Rated temperature
Sensing temperature
Operating temperature
PTC temperature
Response time
Reference temperature
Temperature at minimum resistance
Switching time
Surface temperature
UCTUpper category temperature
V or V
V
RMS
V
BD
V
ins
V
link,max
V
max
V
max,dyn
V
meas
V
meas,max
V
R
V
PTC
Voltage (with subscript only for distinction from volume)
el
Root-mean-square value of voltage
Breakdown voltage
Insulation test voltage
Maximum link voltage
Maximum operating voltage
Maximum dynamic (short-time) operating voltage
Measuring voltage
Maximum measuring voltage
Rated voltage
Voltage drop across a PTC thermistor
αTemperature coefficient
∆Tolerance, change
δ
th
τ
th
Dissipation factor
Thermal cooling time constant
λFailure rate
Lead spacing (in mm)
Abbreviations / Notes
Surface-mount devices
* To be replaced by a number in ordering codes, type designations etc.
+ To be replaced by a letter
All dimensions are given in mm.
The commas used in numerical values denote decimal points.
Important notes at the end of this document.
Page 15 of 16Please read Cautions and warnings and
Page 16
Important notes
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 bindingstatements 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 incumbent on the customer to check and decide whether an EPCOS product with the properties described 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 detailed 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 foregoing 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 Industry" published by the German Electrical and Electronics Industry Association
(ZVEI).
MLSC, MotorCap, PCC, PhaseCap, PhaseMod, SIFERRIT, SIFI, SIKOREL, SilverCap,
SIMDAD, SIMID, SineFormer, SIOV, SIP5D, SIP5K, ThermoFuse, WindCap are trademarksregistered or pending in Europe and in other countries. Further information will be found on
the Internet at www.epcos.com/trademarks.
Page 16 of 16
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