1/17ページ
ダウンロード(9.8Mb)
このカタログについて
ドキュメント名 | Surface Mount Hybrid Aluminum Polymer Capacitors A780 125°C |
---|---|
ドキュメント種別 | 製品カタログ |
ファイルサイズ | 9.8Mb |
取り扱い企業 | マウザー・エレクトロニクス (この企業の取り扱いカタログ一覧) |
この企業の関連カタログ
このカタログの内容
Page1
Overview、Applications、Benefits
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Overview Applications
KEMET’s A780 is a surface mount conductive KEMET’s A780 is a series of high-performance surface
polymer hybrid capacitor with outstanding electrical mount hybrid capacitors. Due to its mechanical
performance. The A780 winding is housed in a robustness, the A780 is suitable for use in mobile,
cylindrical aluminum can with a high/quality rubber automotive and aircraft installations with extremely high
deck. Low ESR is conditioned by a highly conductive demands and operation up to +125°C.
polymer (PEDOT/PSS). The polymer system creates
an electrical pathway between the anodic oxide layer
and the cathode through a mechanical separator
- paper. The A780 winding is impregnated with
liquid electrolyte that translates to the self-healing
features of the capacitor. Thanks to its mechanical
robustness, the A780 is suitable for use in mobile,
automotive and aircraft installations with operation up
to +125°C.
Benefits
• Surface mount form factor • Self-healing behaviours
• High ripple current for smaller case sizes • Outstanding electrical performance
and higher voltages • AEC-Q200 compliance
• High temperature; 125°C/3,000 hours • RoHS compliant
• Low leakage current • Halogen-Free
• High vibration resistance up to 30g
Standard Anti-Vibration
Built Into Tomorrow
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 1
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Page2
Part Number System、Ordering Options Table
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Part Number System
A 780 MS 107 M 1J LA S 030
Capacitor Capacitance Rated Voltage Electrical
Series Size Code Tolerance Packaging ESR
Class Code (pF) (VDC) Parameters
A = Aluminum Surface See First two M = ±20% 63 = 1J LA = S = Automotive Last 3 digits
Mount Hybrid Dimension digits Tape & Reel V = Automotive represent
Polymer Table represent +Anti-Vibration significant
Aluminum significant figures for
Capacitors figures for ESR values.
125°C capacitance (mΩ)
3,000 hours values. Last
digit specifies
the number
of zeros to be
added.
Ordering Options Table
Packaging Type Packaging Code
Standard Packaging Options
Tape & Reel LA
Contact KEMET for other Lead and Packaging options
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 2
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Page3
Dimensions – Millimeters
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Dimensions – Millimeters
Standard
D H
W P R
L
C
0.2 Maximum
Anti-Vibration
Size D L W H C R P
Code Nominal Tolerance Nominal Tolerance Nominal Tolerance Nominal Tolerance Nominal Tolerance Range Nominal
MS 10 ±0.5 12.2 ±0.5 10.3 ±0.2 10.3 ±0.2 11 ±0.2 0.8 – 1.1 4.6
MS
(Anti- 10 ±0.5 12.4 ±0.5 10.3 ±0.2 10.8 ±0.2 11.2 ±0.2 0.7 – 1.1 4.6
Vibration)
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 3
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Page4
Environmental Compliance、Performance Characteristics 、Compensation Factor of Ripple Current (RC) vs. Frequency
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Environmental Compliance
As an environmentally conscious company, KEMET is working continuously with improvements concerning the environmental
effects of both our capacitors and their production. In Europe (RoHS Directive) and in some other geographical areas like China,
legislation has been put in place to prevent the use of some hazardous materials, such as lead (Pb), in electronic equipment.
All products in this catalogue are produced to help our customers’ obligations to guarantee their products and fulfil these
legislative requirements. The only material of concern in our products has been lead (Pb), which has been removed from all
designs to fulfil the requirement of containing less than 0.1% of lead in any homogeneous material. KEMET will closely follow
any changes in legislation worldwide and makes any necessary changes in its products, whenever needed. Some customer
segments such as medical, military and automotive electronics may still require the use of lead in electrode coatings. To clarify
the situation and distinguish products from each other, a special symbol is used on the packaging labels for RoHS compatible
capacitors.
Due to customer requirements, there may appear additional markings such as LF = Lead-free or LFW = Lead-free wires
on the label.
Performance Characteristics
Item Performance Characteristics
Capacitance Range 56 – 100 µF
Rated Voltage 63 VDC
Operating Temperature −55°C to +125°C
Capacitance Tolerance ±20% at 120 Hz/20°C
Life Test 3,000 hours at rated temperature (See conditions in Test Method and Performance)
I = 0.01 CV
Leakage Current
C = Rated capacitance (µF), V = Rated voltage (VDC), Voltage applied for 2 minutes at 20°C.
Compensation Factor of Ripple Current (RC) vs. Frequency
Frequency 100 Hz 400 Hz 1 kHz 10 kHz 100 kHz
Coefficient 0.19 0.35 0.45 0.80 1.00
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 4
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Page5
Test Method & Performance
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Test Method & Performance
Conditions Endurance Life Test High Temperature Storage Test
Temperature +125°C +125°C
Test Duration 3,000 hours 1,000 hours
Ripple Current Rated ripple applied No ripple current applied
Voltage Rated voltage No voltage applied
Performance The following specifications will be satisfied when the capacitor is restored to 20°C.
Capacitance Change Within ±20% of the initial value
Dissipation Factor Does not exceed 200% of the specified value
ESR Does not exceed 200% of the specified value
Leakage Current Does not exceed 200% of the specified value
Damp Heat The following specifications will be satisfied when the capacitor is restored to 20°C
after application of rated voltage for 2,500 hours at 85°C, 85% RH.
Capacitance Change Within ±20% of the initial value
Dissipation Factor Does not exceed 200% of the specified value
ESR Does not exceed 200% of the specified value
Leakage Current Does not exceed 200% of the specified value
Surge Voltage The following specifications will be satisfied when the capacitor is subjected to 1,000 cycles,
(Rated Voltage x each consisting of charge with the surge voltages specified at 105°C for 30 seconds through a
1.15(V)) protective resistor (Rc = 1 kΩ) and discharge for 5 minutes, 30 seconds.
Capacitance Change Within ±20% of the initial value
Dissipation Factor Does not exceed 150% of the specified value
ESR Does not exceed 150% of the specified value
Leakage Current Does not exceed 200% of the specified value
Resistance to
Soldering Heat Measurement for solder temperature profile at capacitor top and terminal.
Capacitance Change Within ±10% of the initial value
Dissipation Factor Does not exceed 150% of the specified value
ESR Does not exceed 150% of the specified value
Leakage Current Does not exceed 200% of the specified value
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 5
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Page6
Test Method & Performance – Anti-Vibration Version、Shelf Life & Re-Ageing
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Test Method & Performance – Anti-Vibration Version
Anti-Vibration Version
Vibration Test Specifications 1.5 mm displacement amplitude or 30 g maximum acceleration. Vibration applied
for three 4-hour sessions at 10 – 2,000 Hz (capacitor on PCB).
Capacitance Change Within ±20% of the initial value
Dissipation Factor Does not exceed 150% of the specified value
ESR Does not exceed 150% of the specified value
Leakage Current Does not exceed 200% the specified value
Shelf Life & Re-Ageing
Shelf Life
Solderability is 12 months
The capacitance, ESR and impedance of a capacitor will not change significantly after extended storage periods, however the
leakage current will slowly increase.
• This series should not be stored in high temperatures or where there is a high level of humidity.
• The suitable storage condition is +5 to +35°C and less than 75% in relative humidity.
• Do not store in damp conditions such as water, saltwater spray or oil spray.
• Do not store in an environment full of hazardous gas (hydrogen sulphide, sulphurous acid gas, nitrous acid, chlorine gas,
ammonium, etc.)
•Do not store under exposure to ozone, ultraviolet rays or radiation.
If a capacitor has been stored for more than 12 months under these conditions and it shows increased leakage current,
then a treatment by voltage application is recommended. The Capacitor should be soldered within 7 days after unpack.
MSL Rating 2A
Re-age Procedure
Apply the rated DC voltage to the capacitor at 125°C for a period of 120 minutes through a 1 kΩ series resistor.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 6
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Page7
Table 1 – Ratings & Part Number Reference 、Installing
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Table 1 – Ratings & Part Number Reference
Rated Surge Rated ESR Dissipation Ripple Ripple Ripple
Voltage Voltage Capacitance Factor Current1 Current Current Leakage Case Case
Maximum2 Maximum2 Current Size KEMET Part Number Size
100 kHz 100 kHz 20°C
(VDC) (VDC) 120 Hz 20°C 20°C 120 Hz 20°C 125°C 100 kHz 100 kHz 2 minute D x L Represents Part Anti-Vibration D x L (mm)
(µF) 105°C (mA) 125°C (mA) (mm) Number Options Version Anti-
(mΩ) (mA) (µA) Vibration
63 72.45 56 30 0.08 1,500 5,500 3,700 35.3 10 × 12.2 A780MS566M1JLAS030 A780MS566M1JLAV030 10 × 12.4
63 72.45 100 30 0.08 1,500 5,500 3,700 63.0 10 × 12.2 A780MS107M1JLAS030 A780MS107M1JLAV030 10 × 12.4
1 Capacitor mounted on PCB, Lop: 3,000 hours
2 Capacitor mounted with low thermal resistance path (heat-sink), Lop: 2,000 hours
KEMET technology allows to achieve enhanced ripple performance by adding a heat sink solution. This component acts as a dissipator of generated
heat, granting effective cooling of the capacitor system. (Contact KEMET Aluminium Innovation Center for details and recommendations)
Installing
Hybrid Polymer Aluminum Capacitors are prone to a change in leakage current due to thermal stress during soldering. The
leakage current may increase after soldering or reflow soldering. Therefore, verify the suitability for use in circuits sensitive
to leakage current.
A general principle is that lower temperature operation results in a longer, useful life of the capacitor. For this reason, it
should be ensured that electrolytic capacitors are placed away from heat-emitting components. Adequate space should be
allowed between components for cooling air to circulate, especially when high ripple current loads are applied. In any case,
the maximum rated temperature must not be exceeded.
• Do not deform the case of capacitors or use capacitors with a deformed case.
• Verify that the connections of the capacitors are able to insert on the board without excessive mechanical force.
Excessive force during insertion, as well as after soldering may cause terminal damage and affect the
electrical performance.
• Ensure electrical insulation between the capacitor case, negative terminal, positive terminal and PCB.
• If the capacitors require mounting through additional means, the recommended mounting accessories shall be used.
• Verify the correct polarization of the capacitor on the board.
KEMET recommends, to ensure that the voltage across each capacitor does not exceed its rated voltage.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 7
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Page8
Temperature Stability Characteristics、Expected Life Calculation Chart
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Temperature Stability Characteristics
Hybrid Polymer Aluminum Capacitors allow high ripple currents for smaller case sizes and higher voltage comparing with
standard electrolytics. The presence of conductive polymer and electrolyte allows for higher temperature robustness and a
more stable product performance.
Temperature Stability Characteristics
Hybrid Versus Electrolytic Ripple Test
45
40
35
30
25
20
15 Hybrid
10 Electrolytic
5
0
0 500 1,000 1,500 2,000 2,500
Time/s
DC Life Formula
Expected DC operational life (Lop, in k hours) can be calculated in accordance to the following equation:
Lop=27×2((85-T)/15)
Where:
Lop: Life at maximum permissible operating temperature with rated operating voltage applied (k hour).
T: Ambient operating temperature (ºC). Recommended to use the formula for the range 85ºC to 125ºC.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 8
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Temperature/ oC
Page9
Stability of ESR across Frequency Range、Landing Pad – Millimeters
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Operational Life
Operational life (Lop1) of a Polymer Hybrid V-Chip mounted on a Printed Circuit Board (PCB) at temperature Ta and ripple
current IAC applied can be converted from the diagram:
PCB (I (1)
RAC = 1.5 A)
1.4
1.2
1
0.8
0.6
0.4
0.2
0
50 75 100 125 150
T (°
a C)
Operational life (Lop2), when using a low thermal resistance path, at terminal temperature Tt and ripple current IAC applied,
can be converted from the diagram:
Heat Sink ( I (2)
RAC = 3.7 A)
1.4
1.2
1
0.8
0.6
0.4
0.2
0
75 100 125 150
TT (°C)
I (1)
RAC and I (2)
RAC correspond to maximum Ripple Current specified for each case and should be consulted in Table 1 of
datasheet A780 series. The dashed lines correspond to the maximum ripple current allowed for each case. As an example,
135°C on terminal does not allow to apply Ripple Current more than corresponds to IAC/I (2)
RAC =0.8.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 9
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
I (2) °
AC/IRAC (125 C)
I (1) °
AC/IRAC (125 C)
Page10
Marking、Construction
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Electrical Parameters across Frequency Range
Due to the conductive polymer and electrolyte, Hybrid Aluminum Polymer Capacitors feature higher conductivity. Therefore,
ESR and Impedance of these capacitors are significantly lower than that of a standard electrolytic capacitor at higher
frequencies. This allows an Hybrid Aluminum Polymer capacitor to replace several standard electrolytic capacitors, reducing
the number of components and maximizing board space.
ESR Versus Frequency Impedance Versus Frequency
10,000
100,000
Hybrid
1,000 10,000
Electrolytic
100 1,000
10 Hybrid 100
Electrolytic 10
1
3.E+01 3.E+02 3.E+03 3.E+04 3.E+05 1
Frequency/Hz 10 100 1,000 10,000 100,000 1,000,000
Frequency (Hz)
Landing Pad – Millimeters
Diameter A B C
10 4.5 4.4 2.2
C 10
(Anti-Vibration) 4.5 4.4 4.6
Units in mm
B A B
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 10
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
ESR/mΩ
Impedance (mΩ)
Page11
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Marking
Date Code*
1st Digits = Rated Voltage
Letter = Year Code T = 2020
st
Trademark Series Final Digits = Week of the Year 01 = 1 week of the Year to
52 = 52nd week of the Year
Date Code* Year Code
(Last 3 Digits)
T 2020
Rated Capacitance (µF) U 2021
Voltage
(VDC) V 2022
W 2023
X 2024
Y 2025
Z 2026
Construction
Aluminum Can
Liquid Electrolyte Detailed Cross Section
Lead Rubber Seal
Terminal Tabs Terminal Tab
Rubber Seal Margin
Aluminum Can
Paper Spacer with
Conductive Polymer
(First Layer)
Paper Spacer with Lead (+)
Conductive Polymer
(Third Layer)
Anode Aluminum Foil,
Etched, Covered with Cathode Aluminum
Aluminum Oxide Foil, Etched Lead (−)
(Second Layer) (Fourth Layer)
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 11
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Page12
Re-Flow Soldering
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Re-Flow Soldering
The soldering conditions should be within the specified conditions below:
• Do not dip the capacitors body into the melted solder.
• Flux should only be applied to the capacitors terminals.
• Vapour heat transfer systems are not recommended. The system should be thermal, such as infra-red radiation or hot
blast.
• Observe the soldering conditions as shown below.
• Do not exceed these limits and avoid repeated reflowing.
Time Period Preheating T1 T2 T3
Φ < 8 Φ ≥ 8
Temperature (°C) 150 – 180 ≥ 200 ≤ 230 ≤ 260 ≤ 240
Time (seconds) 60 – 180 ≤ 50 ≤ 40 ≤ 40
Reflow can be performed per the above parameters up to 2x
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 12
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Page13
Lead Taping & Packaging、Taping for Automatic Insertion Machines
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Lead Taping & Packaging
Reel
Size Code Diameter (mm) Length (mm) A B Reel Quantity Box Quantity
±0.5 ±0.2
MS 10 12.2 26 30 400 2,400
MS (Anti-Vibration) 10 12.4 26 30 400 2,400
Taping for Automatic Insertion Machines
D x L W P F B1 B0 T2
Size Code
Tolerance ±0.3 ±0.1 ±0.1 ±0.2 ±0.2 ±0.2
MS 10 x 12.2 24.0 16.0 11.5 10.7 10.7 13.1
MS (Anti-Vbration) 10 x 12.4 24.0 16.0 11.5 11.2 10.7 12.7
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 13
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Page14
Construction Data
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Construction Data
The manufacturing process begins with the anode foil being
electrochemically etched to increase the surface area and Polymerization
then ‘formed’ to produce the aluminum oxide layer. Both the
anode and cathode foils are then interleaved with absorbent Slitting
paper and wound into a cylinder. During the winding process,
aluminum tabs are attached to each foil to provide the Winding
electrical contact.
Welding
The deck, complete with terminals, is attached to the tabs
and then folded down to rest on top of the winding. The Chemical Treatment
complete winding is impregnated with a conductive polymer
electrolyte before being housed in a suitable container, Forming
usually an aluminum can, and sealed. Throughout the
process, all materials inside the housing must be maintained Assembling
at the highest purity and be compatible with the electrolyte.
Marking
Each capacitor is aged and tested before being packed.
The purpose of aging is to repair any damage in the oxide Aging
layer and thus reduce the leakage current to a very low level.
Aging is normally carried out at the rated temperature of the V-chip formin g and
capacitor and is accomplished by applying voltage to the marking
device while carefully controlling the supply current. The
process may take several hours to complete. Damage to the Inspection
oxide layer can occur due to a variety of reasons:
Packing
• Slitting of the anode foil after forming
• Attaching the tabs to the anode foil
• Minor mechanical damage caused during winding
Floor Terminal
Lead line
Rubber
Case
Anode foil
Cathode foil
Separator
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 14
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Page15
Product Safety
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Product Safety
THESE NOTES SHOULD BE READ IN CONJUNCTION WITH THE PRODUCT DATA SHEET. FAILURE TO OBSERVE THE RATINGS
AND THE INFORMATION ON THIS SHEET MAY RESULT IN A SAFETY HAZARD.
Warning
When potential lethal voltages e.g. 30 VAC (RMS) or 60 VDC are applied to the terminals of this product, the use of a
hazard warning label is recommended.
1. Electrolyte
Hybrid aluminum polymer electrolytic capacitors contain polymer and electrolyte, which can be hazardous.
1.1 Safety Precautions
In the event of gas venting, avoid contact and inhalation. Wash the affected area with hot water. Use rubber gloves to avoid
skin contact. Any contact with the eyes should be liberally irrigated with water and medical advice sought.
2. Intrinsic Properties
2.1 Operating
DC capacitors are polar devices and will operate safely only if correctly connected. Reversing the connections will result
in high leakage currents which could subsequently cause short circuit failure and possibly explosion and fire. Correctly
polarized operation may result in the above failure modes if:
• The surge voltage is exceeded
• The ambient temperature is too high
• Excessive ripple currents are applied
2.2 Non-Operating
Excessive torque or soldering heat may affect the performance of the capacitor or damage the sealing. Electric shock may
result if capacitors are not discharged.
3. Disposal
Aluminum electrolytic capacitors are consignable waste under the Special Waste Regulations 1996 (Statutory Instrument
1996 No 972), which complies with the EC Hazardous Waste Directive – Directive 91/689/EEC. The electrolyte should
therefore be treated as a hazardous waste and advice should be sought from the local office of the Environmental Agency
regarding its disposal.
Due to the construction of an aluminum electrolytic capacitors, high temperature incineration may cause the component to
explode due to build-up of internal pressure. In addition, incineration may also cause the emission of noxious fumes.
KEMET strongly recommends that if there are any doubts regarding the disposal of conductive polymer aluminum solid
electrolytic capacitors, that advice be sought from the local regulating authority.
In addition, KEMET would like to request that users of aluminum electrolytic capacitors respect the needs of the environment
and, wherever possible, recover as much of the materials as possible, i.e., aluminum.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 15
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Page16
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
Product Safety cont.
4. Unsafe Use
Most failures are of a passive nature and do not represent a safety hazard. A hazard may, however, arise if this failure causes
a dangerous malfunction of the equipment in which the capacitor is employed. Circuits should be designed to fail safe under
the normal modes of failure.
The usual failure mode is an increase in leakage current or short circuit. Other possible modes are decrease of capacitance,
increase in dissipation factor (and impedance) or an open circuit. Capacitors should be used in a well-ventilated enclosure or
cabinet.
5. Mounting
Care should be taken when mounting by clamp, that any safety vent in the can is not covered.
6. Fumigation
In many countries throughout the world it is now common practice to fumigate shipments of products in order to control
insect infestation, particularly when wooden packaging is used. Currently, methyl bromide is widely used as a fumigant,
which can penetrate cardboard packing and polymer bags and, therefore, come into direct contact with equipment or
components contained within.
If aluminum electrolytic capacitors become exposed to methyl bromide, then corrosion may occur, depending upon the
concentration and exposure time to the chemical.
This failure mode can affect all types of KEMET aluminum electrolytic capacitors. Methyl bromide can penetrate the seals of
aluminum electrolytic capacitors and cause internal corrosion of the anode connection, resulting in the component becoming
open circuit. The rate of corrosion will depend upon the level of exposure to methyl bromide as well as the subsequent
operating conditions, such as voltage and temperature. It may take months or, in some cases, several years before the
component becomes open circuit.
7. Dielectric Absorption
A phenomenon known as the dielectric absorption can cause aluminum electrolytic capacitors to recharge themselves. The
phenomenon is well known but impossible to predict with any great accuracy, so potentially any electrolytic product could be
affected. Thus, a capacitor that has been charged and then completely discharged, will appear to recharge itself if left open
circuit; this will manifest itself as a small voltage across the terminals of the capacitor. Generally, the voltages seen are less
than 20 VDC, however, higher voltages have on occasion been reported.
In order to avoid any problems caused by this voltage, KEMET recommends that capacitors be discharged before connecting
to the terminals.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 16
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Page17
KEMET Electronics Corporation Sales Offices、Disclaimer
Surface Mount Hybrid Aluminum Polymer Capacitors
A780 125°C
KEMET Electronics Corporation Sales Offi ces
For a complete list of our global sales offi ces, please visit www.kemet.com/sales.
Disclaimer
All product specifi cations, statements, information and data (collectively, the “Information”) in this datasheet are subject to change. The customer is responsible for
checking and verifying the extent to which the Information contained in this publication is applicable to an order at the time the order is placed. All Information given
herein is believed to be accurate and reliable, but it is presented without guarantee, warranty, or responsibility of any kind, expressed or implied.
Statements of suitability for certain applications are based on KEMET Electronics Corporation’s (“KEMET”) knowledge of typical operating conditions for such
applications, but are not intended to constitute – and KEMET specifi cally disclaims – any warranty concerning suitability for a specifi c customer application or use.
The Information is intended for use only by customers who have the requisite experience and capability to determine the correct products for their application. Any
technical advice inferred from this Information or otherwise provided by KEMET with reference to the use of KEMET’s products is given gratis, and KEMET assumes
no obligation or liability for the advice given or results obtained.
Although KEMET designs and manufactures its products to the most stringent quality and safety standards, given the current state of the art, isolated component
failures may still occur. Accordingly, customer applications which require a high degree of reliability or safety should employ suitable designs or other safeguards
(such as installation of protective circuitry or redundancies) in order to ensure that the failure of an electrical component does not result in a risk of personal injury
or property damage.
Although all product–related warnings, cautions and notes must be observed, the customer should not assume that all safety measures are indicted or that other
measures may not be required.
KEMET is a registered trademark of KEMET Electronics Corporation.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4098_A780 • 9/25/2020 17
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com