PTC thermistors as
limit temperature sensors
Motor protection, triple sensors
Series/Type: B59300
Date: February 2012
© EPCOS AG 2012. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
Applications
Thermal protection of winding in electric
motors
Limit temperature monitoring
Features
Thermistor pellets with insulating
encapsulation in series connection
(triple sensor)
Low-resistance type, steep R/T curve
Silver-plated and PTFE-insulated AWG 26
litz wires
Characteristics for sensing temperatures
Tsense = 90 up to 160 °C
conform with DIN 44082
Color coding of litz wires to DIN 44082,
connecting wires in yellow
UL approval to UL 1434 (file number
E69802)
RoHS-compatible
Delivery mode
Bulk
Dimensional drawing
Dimensions in mm
General technical data
Max. operating voltage (TA=0...40°C) Vmax 30 V DC
Max. measuring voltage (TA=25 °C ... Tsense +23 K) Vmeas,max 7.5 V DC
Rated resistance (VPTC ≤2.5 V) RR≤300 Ω
Insulating test voltage Vins 2.5 kV AC
Thermal threshold time ta< 3 s
Operating temperature range (V ≤Vmeas,max) Top 25/ Tsense +23 °C
Operating temperature range (V = Vmax) Top 0/+40 °C
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Important notes at the end of this document.
Electrical specifications and ordering codes
Tsense
°C
R
(Tsense ∆T)
(VPTC ≤2.5 V)
Ω
R
(Tsense +∆T)
(VPTC ≤2.5 V)
Ω
R
(Tsense + 15 K)
(VPTC ≤7.5 V)
Ω
R
(Tsense + 23 K)
(VPTC ≤2.5 V)
Ω
Ordering code
∆T=±5 K
100 ≤1650 ≥3990 ≥12 k - B59300M1100A070
110 ≤1650 ≥3990 ≥12 k - B59300M1110A070
120 ≤1650 ≥3990 ≥12 k - B59300M1120A070
130 ≤1650 ≥3990 ≥12 k - B59300M1130A070
140 ≤1650 ≥3990 ≥12 k - B59300M1140A070
150 ≤1650 ≥3990 ≥12 k - B59300M1150A070
155 ≤1650 ≥3990 ≥12 k - B59300M1155A070
160 ≤1650 ≥3990 ≥12 k - B59300M1160A070
∆T=±7 K
170 ≤1710 ≥1710 - ≥30 k B59300M1170A070
180 ≤1710 ≥1710 - ≥30 k B59300M1180A070
Color coding of litz wires (to DIN 44081)
Tsense
°C
Color
100 red/red
110 brown/brown
120 grey/grey
130 blue/blue
140 white/blue
150 black/black
155 blue/black
160 blue/red
170 white/green
180 white/red
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Important notes at the end of this document.
Reliability data
Test Standard Test conditions ∆R25/R25
Electrical endurance,
cycling
IEC 60738-1 Room temperature, ISmax; Vmax
Number of cycles: 500 000
< 25%
Electrical endurance,
constant
IEC 60738-1 Storage at Vmax /Top,max (Vmax)
Test duration: 1000 h
< 25%
Damp heat IEC 60738-1 Temperature of air: 40 °C
Relative humidity of air: 93%
Duration: 56 days
Test according to IEC 60068-2-78
< 10%
Rapid change
of temperature
IEC 60738-1 T1= Top,min (0 V), T2= Top,max (0 V)
Number of cycles: 5
Test duration: 30 min
Test according to IEC 60068-2-14, test Na
< 25%
Vibration IEC 60738-1 Frequency range: 10 to 55 Hz
Displacement amplitude: 0.75 mm
Test duration: 3 ×2 h
Test according to IEC 60068-2-6, test Fc
< 5%
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Important notes at the end of this document.
Characteristics (typical)
PTC resistance RPTC versus PTC temperature TPTC
(measured at low signal voltage)
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Important notes at the end of this document.
Characteristics (typical)
PTC resistance RPTC versus PTC temperature TPTC
(measured at low signal voltage)
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Important notes at the end of this document.
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 the following period after delivery:
Through-hole devices (housed and leaded PTCs): 24 months
Motor protection sensors, glass-encapsulated sensors and probe assemblies: 24 months
Telecom pair and quattro protectors (TPP, TQP): 24 months
Leadless PTC thermistors for pressure contacting: 12 months
Leadless PTC thermistors for soldering: 6 months
SMDs in EIA sizes 3225 and 4032, and for PTCs with metal tags: 24 months
SMDs in EIA sizes 0402, 0603, 0805 and 1210: 12 months
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.
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Important notes at the end of this document.
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.
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).
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Important notes at the end of this document.
Symbols and terms
A Area
C Capacitance
Cth Heat capacity
f Frequency
I Current
Imax Maximum current
IRRated current
Ires Residual current
IPTC PTC current
IrResidual currrent
Ir,oil Residual currrent in oil (for level sensors)
Ir,air Residual currrent in air (for level sensors)
IRMS Root-mean-square value of current
ISSwitching current
ISmax Maximum switching current
LCT Lower category temperature
N Number (integer)
NcOperating cycles at Vmax, charging of capacitor
NfSwitching cycles at Vmax, failure mode
P Power
P25 Maximum power at 25 °C
Pel Electrical power
Pdiss Dissipation power
RGGenerator internal resistance
Rmin Minimum resistance
RRRated resistance
∆RRTolerance of RR
RPParallel resistance
RPTC PTC resistance
Rref Reference resistance
RSSeries resistance
R25 Resistance at 25 °C
R25,match Resistance matching per reel/ packing unit at 25 °C
∆R25 Tolerance of R25
T Temperature
t Time
TAAmbient temperature
taThermal threshold time
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TCFerroelectric Curie temperature
tESettling time (for level sensors)
TRRated temperature
Tsense Sensing temperature
Top Operating temperature
TPTC PTC temperature
tRResponse time
Tref Reference temperature
TRmin Temperature at minimum resistance
tSSwitching time
Tsurf Surface temperature
UCT Upper category temperature
V or Vel Voltage (with subscript only for distinction from volume)
Vc(max) Maximum DC charge voltage of the surge generator
VF,max Maximum voltage applied at fault conditions in protection mode
VRMS Root-mean-square value of voltage
VBD Breakdown voltage
Vins Insulation test voltage
Vlink,max Maximum link voltage
Vmax Maximum operating voltage
Vmax,dyn Maximum dynamic (short-time) operating voltage
Vmeas Measuring voltage
Vmeas,max Maximum measuring voltage
VRRated voltage
VPTC Voltage drop across a PTC thermistor
αTemperature coefficient
∆Tolerance, change
δth Dissipation factor
τth 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.
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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-
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aforementioned does not apply in the case of individual agreements deviating from the fore-
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Important notes
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