Film Capacitors
EMI Suppression Capacitors (MKP)
Series/Type: B32921C/D ... B32928C/D
Date: December 2016
© EPCOS AG 2016. 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.
Typical applications
X2 class for interference suppression
"Across the line" applications
Climatic
Max. operating temperature: 110 °C
Climatic category (IEC 60068-1):
40/105/56 (ENEC10)
40/110/56 (ENEC15)
Construction
Dielectric: polypropylene (MKP)
Plastic case (UL 94 V-0)
Epoxy resin sealing (UL 94 V-0)
Features
Very small dimensions
Self-healing properties
RoHS-compatible
Halogen-free capacitors available on request
Terminals
Parallel wire leads, lead-free tinned
Special lead lengths available on request
Marking
Manufacturer's logo, lot number,
date code, rated capacitance (coded),
cap. tolerance (code letter),
rated AC voltage,
series number, sub-class (X2),
dielectric code (MKP), climatic category,
passive flammability category, approvals.
Delivery mode
Bulk (untaped)
Taped (Ammo pack or reel)
For taping details, refer to chapter
"Taping and packing"
Dimensional drawings
Drawing 1
Drawing 2
Dimensions in mm
P1= 20.3 mm
Lead
spacing
±0.4
Lead
diameter
d1±0.05
Type Drawing
10 0.6 B32921 1
15 0.8 B32922 1
22.5 0.8 B32923 1
27.5 0.8 B32924 1
37.5 1.0 B32926 1/2
1)
52.5 1.2 B32928 2
1) A few individual types only
EMI suppression capacitors (MKP) B32921C/D ... B32928C/D
X2/305VAC
Page2of24Please read Cautions and warnings and
Important notes at the end of this document.
Marking Examples
C≤10 μF C>10μF
Approvals
Approval marks Standards Certificate
EN 60384-14, IEC 60384-14, Ed. 4 40010694 (approved by VDE) (C ≤10 μF)
EN 60384-14, IEC 60384-14, Ed. 4 E97863 (approved by UL)
UL 1414 / UL 1283 E97863 / E157153
CSA C22.2 No.1 / No. 8 E97863 / E157153 (approved by UL)
CQC (GB/T 14472-1998) CQC06001015331 / CQC06001016454
(C ≤10 μF)
UL 60384-14, CSA E60384-14 E97863 (approved by UL)
Notes: Effective January 2014, only for EMI supression capacitors:
– UL 60384-14 certification replaces both UL 1414 and UL 1283 standards.
– CSA C22.2 No. 1 and CSA C22.s No. 8 are replaced by CSA E60384-14.
– References like 1414, 1283 are removed from the capacitor marking
Capacitors under UL1414, UL1283 produced during or before 2013, are
accepted under UL scope.
Capacitors under CSA C22.2 No.1 / No. 8 produced during or before 2013, are
accepted under cUL scope.
B32921C/D ... B32928C/D
X2/305VAC
Page3of24Please read Cautions and warnings and
Important notes at the end of this document.
Overview of available types
Lead spacing 10 mm 15 mm 22.5 mm 27.5 mm 37.5 mm 52.5 mm
Type B32921 B32922 B32923 B32924 B32926 B32928
CR(μF)
0.010
0.022
0.033
0.047
0.068
0.10
0.15
0.22
0.33
0.47
0.68
1.0
1.5
2.2
3.3
3.9
4.7
5.6
6.8
8.2
10
15
20
25
30
B32921C/D ... B32928C/D
X2/305VAC
Page4of24Please read Cautions and warnings and
Important notes at the end of this document.
Ordering codes and packing units
Lead
spacing
mm
CR
μF
Max. dimensions
w×h×l
mm
Ordering code
(composition see
below)
Straight
terminals,
Ammo
pack
pcs./
MOQ
Straight
terminals,
Reel
pcs./
MOQ
Straight
terminals,
Untaped
pcs./
MOQ
Pins
◆Preferred type
MOQ = Minimum Order Quantity, consisting of 4 packing units.
Further intermediate capacitance values on request.
Composition of ordering code
+ = Capacitance tolerance code: *** = Packaging code:
M=±20%
K=±10%
= (Closer tolerances on request)
289 = Straight terminals, Ammo pack
189 = Straight terminals, Reel
240 = Crimped down from lead spacing 10 mm to
7.5 mm, Ammo pack
140 = Crimped down from lead spacing 10 mm to
7.5 mm, Reel
255 = Crimped down from lead spacing 15 mm to
7.5 mm, Ammo pack
155 = Crimped down from lead spacing 15 mm to
7.5 mm, Reel
003 = Straight terminals, untaped
(lead length 3.2 ±0.3 mm)
000 = Straight terminals, untaped
(lead length6-1mm)
10 0.010 4.0 ×9.0 ×13.0 B32921C3103+*** ◆4000 6800 4000 2
0.022 4.0 ×9.0 ×13.0 B32921C3223+*** ◆4000 6800 4000 2
0.033 4.0 ×9.0 ×13.0 B32921C3333+*** ◆4000 6800 4000 2
0.047 5.0 ×11.0 ×13.0 B32921C3473+*** ◆3320 5200 4000 2
0.068 6.0 ×12.0 ×13.0 B32921C3683+*** 2720 4400 4000 2
0.10 6.0 ×12.0 ×13.0 B32921C3104M*** 2720 4400 4000 2
15 0.033 5.0 ×10.5 ×18.0 B32922C3333K*** 4680 5200 4000 2
0.047 5.0 ×10.5 ×18.0 B32922C3473K*** 4680 5200 4000 2
0.068 5.0 ×10.5 ×18.0 B32922C3683K*** ◆4680 5200 4000 2
0.10 5.0 ×10.5 ×18.0 B32922C3104+*** ◆4680 5200 4000 2
0.15 6.0 ×12.0 ×18.0 B32922C3154+*** ◆3840 4400 4000 2
0.22 7.0 ×12.5 ×18.0 B32922C3224+*** ◆3320 3600 4000 2
0.33 8.0 ×14.0 ×18.0 B32922C3334M*** ◆2920 3000 2000 2
0.33 8.5 ×14.5 ×18.0 B32922D3334K*** 2720 2800 2000 2
0.47 9.0 ×17.5 ×18.0 B32922C3474+*** ◆2560 2800 2000 2
0.68 11.0 ×18.5 ×18.0 B32922C3684+*** ◆2200 1200 2
B32921C/D ... B32928C/D
X2/305VAC
Page5of24Please read Cautions and warnings and
Important notes at the end of this document.
Ordering codes and packing units
Lead
spacing
mm
CR
μF
Max. dimensions
w×h×l
mm
Ordering code
(composition see
below)
Straight
terminals,
Ammo
pack
pcs./
MOQ
Straight
terminals,
Reel
pcs./
MOQ
Straight
terminals,
Untaped
pcs./
MOQ
Pins
◆Preferred type
MOQ = Minimum Order Quantity, consisting of 4 packing units.
Further intermediate capacitance values on request.
Composition of ordering code
+ = Capacitance tolerance code: *** = Packaging code:
M=±20%
K=±10%
= (Closer tolerances on request)
289 = Straight terminals, Ammo pack
189 = Straight terminals, Reel
240 = Crimped down from lead spacing 10 mm to
7.5 mm, Ammo pack
140 = Crimped down from lead spacing 10 mm to
7.5 mm, Reel
255 = Crimped down from lead spacing 15 mm to
7.5 mm, Ammo pack
155 = Crimped down from lead spacing 15 mm to
7.5 mm, Reel
003 = Straight terminals, untaped
(lead length 3.2 ±0.3 mm)
000 = Straight terminals, untaped
(lead length6-1mm)
22.5 0.22 6.0 ×15.0 ×26.5 B32923C3224+*** 2720 2800 2880 2
0.33 6.0 ×15.0 ×26.5 B32923C3334M*** 2720 2800 2880 2
0.33 7.0 ×16.0 ×26.5 B32923D3334K*** 2320 2400 2520 2
0.47 8.5 ×16.5 ×26.5 B32923C3474+*** 1920 2000 2040 2
0.68 10.5 ×16.5 ×26.5 B32923C3684+*** 1560 1600 2160 2
1.0 11.0 ×20.5 ×26.5 B32923C3105+*** ◆1480 1400 2040 2
1.5 12.0 ×22.0 ×26.5 B32923C3155M*** 1800 2
2.2 14.5 ×29.5 ×26.5 B32923C3225+*** 1040 2
27.5 0.68 11.0 ×19.0 ×31.5 B32924C3684+*** 1400 1280 2
1.0 11.0 ×19.0 ×31.5 B32924C3105+*** 1400 1280 2
1.5 12.5 ×21.5 ×31.5 B32924C3155+*** ◆1200 1120 2
2.2 14.0 ×24.5 ×31.5 B32924C3225+*** 1040 2
3.3 16.0 ×32.0 ×31.5 B32924D3335K*** 880 2
3.3 18.0 ×27.5 ×31.5 B32924C3335M*** 800 2
4.7 18.0 ×33.0 ×31.5 B32924C3475M*** 800 2
4.7 21.0 ×31.0 ×31.5 B32924D3475K*** 720 2
5.6 22.0 ×36.5 ×31.5 B32924C3565+*** 784 2
B32921C/D ... B32928C/D
X2/305VAC
Page6of24Please read Cautions and warnings and
Important notes at the end of this document.
Ordering codes and packing units
Lead
spacing
mm
CR
μF
Max. dimensions
w×h×l
mm
Ordering code
(composition see
below)
Straight
terminals,
Ammo
pack
pcs./
MOQ
Straight
terminals,
Reel
pcs./
MOQ
Straight
terminals,
Untaped
pcs./
MOQ
Pins
◆Preferred type
MOQ = Minimum Order Quantity, consisting of 4 packing units.
Further intermediate capacitance values on request.
Composition of ordering code
+ = Capacitance tolerance code: *** = Packaging code:
M=±20%
K=±10%
= (Closer tolerances on request)
289 = Straight terminals, Ammo pack
189 = Straight terminals, Reel
240 = Crimped down from lead spacing 10 mm to
7.5 mm, Ammo pack
140 = Crimped down from lead spacing 10 mm to
7.5 mm, Reel
255 = Crimped down from lead spacing 15 mm to
7.5 mm, Ammo pack
155 = Crimped down from lead spacing 15 mm to
7.5 mm, Reel
003 = Straight terminals, untaped
(lead length 3.2 ±0.3 mm)
000 = Straight terminals, untaped
(lead length6-1mm)
37.5 2.2 14.0 ×25.0 ×41.5 B32926C3225+*** 1380 2
3.3 16.0 ×28.5 ×41.5 B32926C3335+*** 800 2
3.9 16.0 ×28.5 ×41.5 B32926C3395+*** 800 2
4.7 18.0 ×32.5 ×41.5 B32926C3475+*** 720 2
5.6 18.0 ×32.5 ×41.5 B32926C3565+*** 720 2
6.8 20.0 ×39.5 ×41.5 B32926C3685+*** 640 2
8.2 20.0 ×39.5 ×41.5 B32926C3825+*** 640 2
10 28.0 ×42.5 ×41.5 B32926C3106+*** 440 2
15 30.0 ×45.0 ×42.0 B32926C3156M*** 400 2
15 33.0 ×48.0 ×42.0 B32926D3156+*** 180 4
52.5 20 30.0 ×45.0 ×57.5 B32928C3206+*** 280 4
25 35.0 ×50.0 ×57.5 B32928C3256+*** 108 4
30 35.0 ×50.0 ×57.5 B32928C3306M*** 108 4
B32921C/D ... B32928C/D
X2/305VAC
Page7of24Please read Cautions and warnings and
Important notes at the end of this document.
Technical data
Reference standard: IEC / UL 60384-14. All data given atT=20°C unless otherwise specified.
Max. operating temperature Top,max +110 °C
Dissipation factor tan δ(in 10-3)
at 20 °C (upper limit values)
CR≤0.1 μF 0.1μF<CR≤2.2 μF CR>2.2 μF
at 1 kHz 1.0 1.0 2.0
100 kHz 5.0
Insulation resistance Rins
or time constant τ=C
RRins
CR≤0.33 μF CR>0.33 μF
100 000 MΩ30 000 s
at 20 °C, rel. humidity ≤65%
(minimum as-delivered values)
DC test voltage 2121 V,2s(C≤10 μF) / 1312 V,2s(C>10μF)
The repetition of this DC voltage test may damage the capacitor. Special care must be taken in
case of use several capacitors in a parallel configuration.
Passive flammability category B
Maximum continuous DC voltage VDC 630 V
Maximum continuous AC voltage VAC 310 V (50/60 Hz)
Rated AC voltage (IEC 60384-14) 305 V (50/60 Hz)
Operating AC voltage Vop at high
temperature
TA≤110 °C Vop =V
AC (continuously)
TA≤110 °C Vop = 1.25 VAC (1000 h)
Damp heat test 56 days / 40 °C / 93% relative humidity
Limit values after damp heat test Capacitance change ΔC/C≤5%
Dissipation factor change Δtan δ≤5.10-3 (at 1 kHz)
≤1.0 10-3 (at 10 kHz)
Insulation resistance Rins or
time constant τ=C
RRins
≥50% of minimum
as-delivered values
B32921C/D ... B32928C/D
X2/305VAC
Page8of24Please read Cautions and warnings and
Important notes at the end of this document.
Pulse handling capability
"dV/dt" represents the maximum permissible voltage change per unit of time for non-sinusoidal
voltages, expressed in V/μs.
"k0" represents the maximum permissible pulse characteristic of the waveform applied to the
capacitor, expressed in V2/μs.
Note:
The values of dV/dt and k0provided below must not be exceeded in order to avoid damaging the
capacitor.
dV/dt and k0values
Lead spacing 10 mm 15 mm 22.5 mm 27.5 mm 37.5 mm 52.5 mm
dV/dt in V/μs 475 340 170 120 80 50
k0in V2/μs 408500 292400 146200 103200 68800 43200
Impedance Z versus frequency f
(typical values)
B32921C/D ... B32928C/D
X2/305VAC
Page9of24Please read Cautions and warnings and
Important notes at the end of this document.
Permissible AC current IRMS versus frequency f
(for sinusoidal waveforms TA≤90 °C and ΔESR < 100% from receipt condition)
Lead spacing 10 mm Lead spacing 15 mm
Lead spacing 22.5 mm Lead spacing 27.5 mm
B32921C/D ... B32928C/D
X2/305VAC
Page 10 of 24Please read Cautions and warnings and
Important notes at the end of this document.
Permissible AC current IRMS versus frequency f
(for sinusoidal waveforms TA≤90 °C and ΔESR < 100% from receipt condition)
Lead spacing 37.5 mm Lead spacing 52.5 mm
B32921C/D ... B32928C/D
X2/305VAC
Page 11 of 24Please read Cautions and warnings and
Important notes at the end of this document.
Testing and Standards
Test Reference Conditions of test Performance requirements
Electrical
Parameters
IEC 60384-14 Voltage Proof:
Between terminals:
4.3 ×VR(DC), 1 min
Terminals and enclosure:
2V
R+1500VAC
Insulation resistance, RINS
Capacitance, C
Dissipation factor, tan δ
Within specified limits
Robustness
of termina-
tions
IEC 60068-2-21 Tensile strength (test Ua1) Capacitance and tan δ
within specified limits
Wire diameter Tensile
force
0.5 < d1≤0.8 mm
0.8 < d1≤1.25 mm
10 N
20 N
Resistance to
soldering
heat
IEC 60068-2-20,
test Tb,
method 1A
Solder bath temperature at
260 ±5°C, immersion for
10 seconds
ΔC/C0≤5%
tan δwithin specified limits
Rapid
change of
temperature
IEC 60384-14 TA= lower category temperature
TB= upper category temperature
Five cycles, duration t = 30 min.
No visible damage
|ΔC/C0|≤5%
tan δwithin specified limits
Damp Heat
Steady State
IEC 60384-14 Test Ca
40 °C / 93% RH / 56 days
No visible damage
|ΔC/C0|≤5%
|Δtan δ|≤0.008 for C ≤1μF
|Δtan δ|≤0.005 forC>1μF
Voltage proof
RINS ≥50% of initial limit
Impulse test
Endurance
IEC 60384-14 3 impulses
TB/ 1.25 VR/ 1000 hours,
1000 Vrms for 0.1 s every hour
No visible damage
|ΔC/C0|≤10%
|Δtan δ|≤0.008 for C ≤1μF
|Δtan δ|≤0.005 forC>1μF
Voltage proof
RINS ≥50% of initial limit
Passive
flammability
IEC 60384-14 Flame applied for a period of
time depending on capacitor
volume
B
Active
flammability
IEC 60384-14 20 discharges at 2.5 kV + VRThe cheesecloth shall not
burn with a flame
B32921C/D ... B32928C/D
X2/305VAC
Page 12 of 24Please read Cautions and warnings and
Important notes at the end of this document.
Mounting guidelines
1 Soldering
1.1 Solderability of leads
The solderability of terminal leads is tested to IEC 60068-2-20, test Ta, method 1.
Before a solderability test is carried out, terminals are subjected to accelerated ageing (to
IEC 60068-2-2, test Ba: 4 h exposure to dry heat at 155 °C). Since the ageing temperature is far
higher than the upper category temperature of the capacitors, the terminal wires should be cut off
from the capacitor before the ageing procedure to prevent the solderability being impaired by the
products of any capacitor decomposition that might occur.
Solder bath temperature 235 ±5°C
Soldering time 2.0 ±0.5 s
Immersion depth 2.0 +0/0.5 mm from capacitor body or seating plane
Evaluation criteria:
Visual inspection Wetting of wire surface by new solder ≥90%, free-flowing solder
1.2 Resistance to soldering heat
Resistance to soldering heat is tested to IEC 60068-2-20, test Tb, method 1A.
Conditions:
Series Solder bath temperature Soldering time
MKT boxed (except 2.5 ×6.5 ×7.2 mm)
coated
uncoated (lead spacing > 10 mm)
260 ±5°C 10 ±1s
MFP
MKP (lead spacing > 7.5 mm)
MKT boxed (case 2.5 ×6.5 ×7.2 mm) 5±1s
MKP
MKT
(lead spacing ≤7.5 mm)
uncoated (lead spacing ≤10 mm)
insulated (B32559)
<4s
recommended soldering
profile for MKT uncoated
(lead spacing ≤10 mm) and
insulated (B32559)
B32921C/D ... B32928C/D
X2/305VAC
Page 13 of 24Please read Cautions and warnings and
Important notes at the end of this document.
Immersion depth 2.0 +0/0.5 mm from capacitor body or seating plane
Shield Heat-absorbing board, (1.5 ±0.5) mm thick, between capacitor
body and liquid solder
Evaluation criteria:
Visual inspection No visible damage
ΔC/C0
2% for MKT/MKP/MFP
5% for EMI suppression capacitors
tan δAs specified in sectional specification
B32921C/D ... B32928C/D
X2/305VAC
Page 14 of 24Please read Cautions and warnings and
Important notes at the end of this document.
1.3 General notes on soldering
Permissible heat exposure loads on film capacitors are primarily characterized by the upper cate-
gory temperature Tmax. Long exposure to temperatures above this type-related temperature limit
can lead to changes in the plastic dielectric and thus change irreversibly a capacitor's electrical
characteristics. For short exposures (as in practical soldering processes) the heat load (and thus
the possible effects on a capacitor) will also depend on other factors like:
Pre-heating temperature and time
Forced cooling immediately after soldering
Terminal characteristics:
diameter, length, thermal resistance, special configurations (e.g. crimping)
Height of capacitor above solder bath
Shadowing by neighboring components
Additional heating due to heat dissipation by neighboring components
Use of solder-resist coatings
The overheating associated with some of these factors can usually be reduced by suitable coun-
termeasures. For example, if a pre-heating step cannot be avoided, an additional or reinforced
cooling process may possibly have to be included.
EPCOS recommendations
As a reference, the recommended wave soldering profile for our film capacitors is as follows:
B32921C/D ... B32928C/D
X2/305VAC
Page 15 of 24Please read Cautions and warnings and
Important notes at the end of this document.
Body temperature should follow the description below:
MKP capacitor
During pre-heating: Tp≤110 °C
During soldering: Ts≤120 °C, ts≤45 s
MKT capacitor
During pre-heating: Tp≤125 °C
During soldering: Ts≤160 °C, ts≤45 s
When SMD components are used together with leaded ones, the film capacitors should not pass
into the SMD adhesive curing oven. The leaded components should be assembled after the SMD
curing step.
Leaded film capacitors are not suitable for reflow soldering.
In order to ensure proper conditions for manual or selective soldering, the body temperature of
the capacitor (Ts) must be ≤120 °C.
One recommended condition for manual soldering is that the tip of the soldering iron should
be < 360 °C and the soldering contact time should be no longer than 3 seconds.
For uncoated MKT capacitors with lead spacings ≤10 mm (B32560/B32561) the following mea-
sures are recommended:
pre-heating to not more than 110 °C in the preheater phase
rapid cooling after soldering
Please refer to EPCOS Film Capacitor Data Book in case more details are needed.
B32921C/D ... B32928C/D
X2/305VAC
Page 16 of 24Please read Cautions and warnings and
Important notes at the end of this document.
Application note for the different possible X1 / X2 positions
In series with the powerline
(i.e. capacitive power supply)
Typical Applications:
Power meters
ECUs for white goods and household
appliances
Different sensor applications
Severe ambient conditions
In parallel with the powerline
Typical Applications:
Standard X2 are used parallel over the mains for
reducing electromagnetic interferences coming
from the grid. For such purposes they must meet
the applicable EMC directives and standards.
Basic circuit Basic circuit
Required features
High capacitance stability over the lifetime
Narrow tolerances for a controlled current
supply
Required features
Standard safety approvals
(ENEC, UL, CSA, CQC)
High pulse load capability
Withstand surge voltages
Recommended EPCOS product series
B3293* (305 V AC) heavy duty with
EN approval for X2 (UL Q1/2010)
B3265* MKP series
standard MKP capacitor without safety
approvals
B3267*L MKP series
standard MKP capacitor without safety
approvals
B3292*H/J (305 V AC), severe ambient
condition, approved as X2
Recommended EPCOS product series
B3292*C/D (305 V AC)
standard series, approved as X2
B3291* (330 V AC), approved as X1
B3291* (530 V AC), approved as X1
B3292*H/J (305 V AC), severe ambient
condition, approved as X2
B32921C/D ... B32928C/D
X2/305VAC
Page 17 of 24Please read Cautions and warnings and
Important notes at the end of this document.
Cautions and warnings
Do not exceed the upper category temperature (UCT).
Do not apply any mechanical stress to the capacitor terminals.
Avoid any compressive, tensile or flexural stress.
Do not move the capacitor after it has been soldered to the PC board.
Do not pick up the PC board by the soldered capacitor.
Do not place the capacitor on a PC board whose PTH hole spacing differs from the specified
lead spacing.
Do not exceed the specified time or temperature limits during soldering.
Avoid external energy inputs, such as fire or electricity.
Avoid overload of the capacitors.
The table below summarizes the safety instructions that must always be observed. A detailed de-
scription can be found in the relevant sections of the chapters "General technical information" and
"Mounting guidelines".
Topic Safety information Reference chapter
"General technical
information"
Storage
conditions
Make sure that capacitors are stored within the specified
range of time, temperature and humidity conditions.
4.5
"Storage conditions"
Flammability Avoid external energy, such as fire or electricity (passive
flammability), avoid overload of the capacitors (active
flammability) and consider the flammability of materials.
5.3
"Flammability"
Resistance to
vibration
Do not exceed the tested ability to withstand vibration.
The capacitors are tested to IEC 60068-2-6.
EPCOS offers film capacitors specially designed for
operation under more severe vibration regimes such as
those found in automotive applications. Consult our
catalog "Film Capacitors for Automotive Electronics".
5.2
"Resistance to
vibration"
Topic Safety information Reference chapter
"Mounting guidelines"
Soldering Do not exceed the specified time or temperature limits
during soldering.
1 "Soldering"
Cleaning Use only suitable solvents for cleaning capacitors. 2 "Cleaning"
Embedding of
capacitors in
finished
assemblies
When embedding finished circuit assemblies in plastic
resins, chemical and thermal influences must be taken
into account.
Caution: Consult us first, if you also wish to embed other
uncoated component types!
3 "Embedding of
capacitors in finished
assemblies"
B32921C/D ... B32928C/D
X2/305VAC
Page 18 of 24Please read Cautions and warnings and
Important notes at the end of this document.
Design of EMI Capacitors
EPCOS EMI capacitors use polypropylene (PP) film metalized with a thin layer of Zinc (Zn).
The following key points have made this design suitable to IEC/UL testing, holding a minimum
size.
Overvoltage AC capability with very high temperature Endurance test of IEC60384-14
(4th edition) / UL60384-14 (2nd edition) must be performed at 1.25 ×VRat maximum tempera-
ture, during 1000 hours, with a capacitance drift less than 10%.
Higher breakdown voltage withstanding if compared to other film metallizations, like Aluminum.
IEC60384-14 (4th edition) / UL60384-14 (2nd edition) establishes high voltage tests performed
at 4.3 ×VR1 minute, impulse testing at 2500 V for C= 1 μF and active flammability tests.
Damp heat steady state: 40 °C/ 93% RH / 56 days. (without voltage or current load)
Effect of humidity on capacitance stability
Long contact of a film capacitor with humidity can produce irreversible effects. Direct contact with
liquid water or excess exposure to high ambient humidity or dew will eventually remove the film
metallization and thus destroy the capacitor. Plastic boxed capacitors must be properly tested in
the final application at the worst expected conditions of temperature and humidity in order to
check if any parameter drift may provoke a circuit malfunction.
In case of penetration of humidity through the film, the layer of Zinc can be degraded, specially
under AC operation (change of polarity), accelerated by the temperature, provoking an increment
of the serial resistance of the electrode and eventually a reduction of the capacitance value.
For DC operation, the parameter drift is much less.
Plastic boxes and resins can not protect 100% against humidity. Metal enclosures, resin potting or
coatings or similar measures by customers in their applications will offer additional protection
against humidity penetration.
Display of ordering codes for EPCOS products
The ordering code for one and the same product can be represented differently in data sheets,
data books, other publications and the website of EPCOS, or in order-related documents such as
shipping notes, order confirmations and product labels. The varying representations of the or-
dering codes are due to different processes employed and do not affect the specifications
of the respective products. Detailed information can be found on the Internet under
www.epcos.com/orderingcodes.
B32921C/D ... B32928C/D
X2/305VAC
Page 19 of 24Please read Cautions and warnings and
Important notes at the end of this document.
Symbols and terms
Symbol English German
αHeat transfer coefficient Wärmeübergangszahl
αCTemperature coefficient of capacitance Temperaturkoeffizient der Kapazität
ACapacitor surface area Kondensatoroberfläche
βCHumidity coefficient of capacitance Feuchtekoeffizient der Kapazität
CCapacitance Kapazität
CRRated capacitance Nennkapazität
ΔCAbsolute capacitance change Absolute Kapazitätsänderung
ΔC/C Relative capacitance change (relative
deviation of actual value)
Relative Kapazitätsänderung (relative
Abweichung vom Ist-Wert)
ΔC/CRCapacitance tolerance (relative deviation
from rated capacitance)
Kapazitätstoleranz (relative Abweichung
vom Nennwert)
dt Time differential Differentielle Zeit
ΔtTime interval Zeitintervall
ΔTAbsolute temperature change
(self-heating)
Absolute Temperaturänderung
(Selbsterwärmung)
Δtan δAbsolute change of dissipation factor Absolute Änderung des Verlustfaktors
ΔVAbsolute voltage change Absolute Spannungsänderung
dV/dt Time differential of voltage function (rate
of voltage rise)
Differentielle Spannungsänderung
(Spannungsflankensteilheit)
ΔV/ΔtVoltage change per time interval Spannungsänderung pro Zeitintervall
EActivation energy for diffusion Aktivierungsenergie zur Diffusion
ESL Self-inductance Eigeninduktivität
ESR Equivalent series resistance Ersatz-Serienwiderstand
fFrequency Frequenz
f1Frequency limit for reducing permissible
AC voltage due to thermal limits
Grenzfrequenz für thermisch bedingte
Reduzierung der zulässigen
Wechselspannung
f2Frequency limit for reducing permissible
AC voltage due to current limit
Grenzfrequenz für strombedingte
Reduzierung der zulässigen
Wechselspannung
frResonant frequency Resonanzfrequenz
FDThermal acceleration factor for diffusion Therm. Beschleunigungsfaktor zur
Diffusion
FTDerating factor Deratingfaktor
iCurrent (peak) Stromspitze
ICCategory current (max. continuous
current)
Kategoriestrom (max. Dauerstrom)
B32921C/D ... B32928C/D
X2/305VAC
Page 20 of 24Please read Cautions and warnings and
Important notes at the end of this document.
Symbol English German
IRMS (Sinusoidal) alternating current,
root-mean-square value
(Sinusförmiger) Wechselstrom
izCapacitance drift Inkonstanz der Kapazität
k0Pulse characteristic Impulskennwert
LSSeries inductance Serieninduktivität
λFailure rate Ausfallrate
λ0Constant failure rate during useful
service life
Konstante Ausfallrate in der
Nutzungsphase
λtest Failure rate, determined by tests Experimentell ermittelte Ausfallrate
Pdiss Dissipated power Abgegebene Verlustleistung
Pgen Generated power Erzeugte Verlustleistung
QHeat energy Wärmeenergie
ρDensity of water vapor in air Dichte von Wasserdampf in Luft
RUniversal molar constant for gases Allg. Molarkonstante für Gas
ROhmic resistance of discharge circuit Ohmscher Widerstand des
Entladekreises
RiInternal resistance Innenwiderstand
Rins Insulation resistance Isolationswiderstand
RPParallel resistance Parallelwiderstand
RSSeries resistance Serienwiderstand
Sseverity (humidity test) Schärfegrad (Feuchtetest)
tTime Zeit
TTemperature Temperatur
τTime constant Zeitkonstante
tan δDissipation factor Verlustfaktor
tan δDDielectric component of dissipation
factor
Dielektrischer Anteil des Verlustfaktors
tan δPParallel component of dissipation factor Parallelanteil des Verlfustfaktors
tan δSSeries component of dissipation factor Serienanteil des Verlustfaktors
TATemperature of the air surrounding the
component
Temperatur der Luft, die das Bauteil
umgibt
Tmax Upper category temperature Obere Kategorietemperatur
Tmin Lower category temperature Untere Kategorietemperatur
tOL Operating life at operating temperature
and voltage
Betriebszeit bei Betriebstemperatur und
-spannung
Top Operating temperature, TA+ΔT Beriebstemperatur, TA+ΔT
TRRated temperature Nenntemperatur
Tref Reference temperature Referenztemperatur
tSL Reference service life Referenz-Lebensdauer
B32921C/D ... B32928C/D
X2/305VAC
Page 21 of 24Please read Cautions and warnings and
Important notes at the end of this document.
Symbol English German
VAC AC voltage Wechselspannung
VCCategory voltage Kategoriespannung
VC,RMS Category AC voltage (Sinusförmige)
Kategorie-Wechselspannung
VCD Corona-discharge onset voltage Teilentlade-Einsatzspannung
Vch Charging voltage Ladespannung
VDC DC voltage Gleichspannung
VFB Fly-back capacitor voltage Spannung (Flyback)
ViInput voltage Eingangsspannung
VoOutput voltage Ausgangssspannung
Vop Operating voltage Betriebsspannung
VpPeak pulse voltage Impuls-Spitzenspannung
Vpp Peak-to-peak voltage Impedance Spannungshub
VRRated voltage Nennspannung
RAmplitude of rated AC voltage Amplitude der Nenn-Wechselspannung
VRMS (Sinusoidal) alternating voltage,
root-mean-square value
(Sinusförmige) Wechselspannung
VSC S-correction voltage Spannung bei Anwendung "S-correction"
Vsn Snubber capacitor voltage Spannung bei Anwendung
"Beschaltung"
ZImpedance Scheinwiderstand
Lead spacing Rastermaß
B32921C/D ... B32928C/D
X2/305VAC
Page 22 of 24Please 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).
Important notes
Page 23 of 24
7. The trade names EPCOS, CeraDiode, CeraLink, CeraPad, CeraPlas, CSMP, CSSP, CTVS,
DeltaCap, DigiSiMic, DSSP, ExoCore, FilterCap, FormFit, LeaXield, MiniBlue, MiniCell, MKD,
MKK, MotorCap, PCC, PhaseCap, PhaseCube, PhaseMod, PhiCap, PQSine, SIFERRIT,
SIFI, SIKOREL, SilverCap, SIMDAD, SiMic, SIMID, SineFormer, SIOV, SIP5D, SIP5K, TFAP,
ThermoFuse, WindCap are trademarks registered or pending in Europe and in other coun-
tries. Further information will be found on the Internet at www.epcos.com/trademarks.
Important notes
Page 24 of 24
