Heating elements
Metallized round disks, 230 V
A53
Applications
Home appliances
doorlock for washing machines
thermal actuators
insecticide and perfume vaporizers
Features
Silver metallization
For clamp contacting, not suitable for soldering
Self-regulating
UL approval for T
ref
= 110
°C
and 220
°C
to UL 1434 (file number E69802)
with V
max
= 140 V and V
R
= 120 V
RoHS compatible
Options
Other dimensions and ratings on request
Delivery mode
Packed in blister trays
Dimensional drawing
Dimensions in mm
General technical data
Max. operating voltage
Rated voltage
Breakdown voltage
Curvature
Operating temperature range
Operating temperature range
Operating temperature range
Tolerance of R
R
V
max
V
R
V
BD
265
230
500
< 0.2
40/+200
40/+60
40/+100
±35
VAC
VAC
V
mm
°C
°C
°C
%
(T
A
= 25
°C)
(V = 0)
T
op
(V = V
R
; T
ref
≤
60
°C)
T
op
(V = V
R
; T
ref
> 60
°C)
T
op
∆R
R
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 6
Heating elements
Metallized round disks, 230 V
A53
Electrical specifications and ordering codes
T
ref
°C
50
70
90
110
130
150
180
220
270
R
min
(V = V
R
)
Ω
1750
2)
1400
1200
960
840
700
530
640
530
T
surf 1)
(V = V
R
)
°C
90
105
120
135
155
170
200
235
275
R
R
(V
meas
≤
1.5 V)
Ω
4200
4200
4200
4200
4200
4200
4200
6000
6000
Ordering code
B59053A0050A010
B59053A0070A010
B59053A0090A010
B59053A0110A010
B59053A0130A010
B59053A0150A010
B59053A0180A010
B59053A0220A010
B59053A0270A010
Characteristics (typical)
PTC resistance R
PTC
versus
PTC temperature T
PTC
(measured at low signal voltage)
PTC resistance R
PTC
versus
PTC temperature T
PTC
(measured at low signal voltage)
1) Measured between points
2) T (R
PTC
= R
min
) < 25
°C
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 6
Heating elements
Metallized round disks, 230 V
A53
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 ther-
mistors 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 hu-
midity
≤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 opera-
tion (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.
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. Es-
pecially 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.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 4 of 6
Heating elements
Metallized round disks, 230 V
A53
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 at-
mospheric conditions. Avoid use in deoxidizing gases (chlorine gas, hydrogen sulfide gas, am-
monia 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).
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 6
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