A784MW157M1JLAV015 KEMET | Alldatasheet
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Technical content
1© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Built Into Tomorrow Benefits
- Surface mount form factor
- High ripple current up to 2.5Arms at 150°C
- High temperature; 150°C up to 1,000 hours
- Low leakage current (Typically no re-ageing required)
- High vibration resistance up to 30g
- Self-healing behaviors
- Outstanding electrical performance
- AEC-Q200 compliance
- RoHS compliant
- Halogen-Free Overview KEMET’s A784 is a surface mount conductive polymer hybrid capacitor with outstanding electrical performance. The A784 winding is housed in a cylindrical aluminum can with a high/quality rubber deck. Low ESR is conditioned by a highly conductive polymer (PEDOT/PSS). The polymer system creates an electrical pathway between the anodic oxide layer and the cathode through a mechanical separator -paper. The A784 winding is impregnated with liquid electrolyte that translates to the self-healing features of the capacitor. Thanks to its mechanical robustness, the A784 is suitable for use in mobile, automotive and aircraft installations with operation up to +150°C.
Applications
KEMET’s A784 is a series of high-performance surface mount hybrid capacitors. Due to its mechanical robustness, the A784 is suitable for use in mobile, automotive and aircraft installations with extremely high demands and operation up to +150°C. Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Anti-Vibration Standard
2© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Part Number System A 784 MW 157 M 1J LA V 015 Capacitor Class Series Size Code Capacitance Code (pF) Tolerance Rated Voltage (VDC) Packaging Electrical Parameters ESR A = Aluminum Surface Mount Hybrid Polymer Aluminum Capacitors 150°C 1,000 hours See Dimension Table First two digits represent significant figures for capacitance values. Last digit specifies the number of zeros to be added. M = ±20% 25 = 1E 35 = 1V 50 = 1H 63 = 1J LA = Tape & Reel S = Automotive V = Automotive +Anti-Vibration Last 3 digits represent significant figures for ESR values. (mΩ) Ordering Options Table Packaging Type Packaging Code Standard Packaging Options Tape & Reel LA Contact KEMET for other Lead and Packaging options
3© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Dimensions – Standard – Millimeters Standard L W D H C R
0.2 Maximum
P Size Code D L W H C R P J K Nominal Tolerance Nominal Tolerance Nominal Tolerance Nominal Tolerance Nominal Tolerance Range Nominal Nominal Nominal
4© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Dimensions – Anti-Vibration – Millimeters Anti-Vibration K J Size Code D L W H C R P J K Nominal Tolerance Nominal Tolerance Nominal Tolerance Nominal Tolerance Nominal Tolerance Range Nominal Nominal Nominal MS (Anti- Vibration) MW (Anti- Vibration)
5© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Environmental Compliance All Part Number in this datasheet are Reach and RoHS compliant and Halogen-Free. 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 100 – 560 µF Rated Voltage 25 – 63 VDC Operating Temperature −55°C to +150°C Capacitance Tolerance ±20% at 120 Hz/20°C Life Test 1,000 hours at rated temperature (See conditions in Test Method and Performance) Leakage Current I = 0.01 CV C = Rated capacitance (µF), V = Rated voltage (VDC), Voltage applied for 2 minutes at 20°C. Compensation Factor of Ripple Current (RC) vs. Frequency Frequecy correction factor for permissible ripple current should be calculated following IAC, f / IAC, 100 kHz : Rated Voltage (V) Frequency 100 Hz 200 Hz 500 Hz 1 kHz 5 kHz 10 kHZ 50 kHz 100 kHz 25 and 35 Coefficient
6© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Test Method & Performance Conditions Endurance Life Test High Temperature Storage Test Temperature +150°C +150°C Test Duration 1,000 hours at rated temperature (See conditions in Test Method and Performance) 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 ±30% 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 the specified value Does not exceed the specified value after Voltage treatment (Re-age procedure) 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 the specified value Surge Voltage (Rated Voltage x 1.15( V )) The following specifications will be satisfied when the capacitor is subjected to 1,000 cycles, each consisting of charge with the surge voltages specified at 150°C for 30 seconds through a 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 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 the specified value
7© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Test Method & Performance – Anti-Vibration Version Anti-Vibration Version Only 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 the specified value Shelf Life & Re-Ageing Shelf Life Solderability is 12 months after manufacturing date. The capacitance, ESR and impedance of a capacitor will not change significantly after extended storage periods, however the leakage current will slowly increase.
- 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 containing gases such as 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. MSL 1 rating according to IPC/JEDEC-J-STD-020. 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.
8© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Table 1 – Ratings & Part Number Reference Rated Voltage Surge Voltage Rated Capacitance ESR Dissipation Factor Ripple Current 1 Ripple Current 2 Leakage Current Case Size KEMET Part Number Case Size (VDC) (VDC) 120 Hz 20°C (µF) 100 kHz 20°C (mΩ) 120 Hz 20°C 100 kHz 125°C (mA) 100 kHz 150°C (mA) 20°C 2 min (µA) D x L (mm) Standard Version Anti-Vibration Version D x L (mm) Anti- Vibration 35 40.25 560 13 0.12 3,900 2,500 196 10 × 16.5 A784MW567M1VLAS013 A784MW567M1VLAV013 10 × 16.7 50 57.50 150 26 0.10 2,700 1,700 75 10 × 12.2 A784MS157M1HLAS026 A784MS157M1HLAV026 10 × 12.4 63 72.45 100 28 0.08 2,600 1,700 63 10 × 12.2 A784MS107M1JLAS028 A784MS107M1JLAV028 10 × 12.4
1 Capacitor mounted on PCB, Lop: 4,000 hours
2 Capacitor mounted on PCB, Lop: 1,000 hours
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. Depending on the nature of the circuit, it may be recommended to follow the re-aging procedure before application. 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 Hybrid Polymer Aluminum 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.
9© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Electrical Parameters across Frequency Range A784MW567M1VLAV013 100 1,000 10,000 100,000 10 100 1,000 10,000 100,000 1,000,000 Z and ESR (mΩ) Frequency (Hz) Typical Z and ESR (f,T) 560uF/35V A784MW567M1VLAV013 -55ºC Z 25 ºC Z 15 0ºC Z -55ºC E SR 25 ºC ESR 15 0ºC ES R 100 200 300 400 500 600 100 1,000 10,000 100,000 C (µF) Frequency (Hz) Typical C (f,T) 560uF/35V A784MW567M1VLAV013 -55ºC 25 ºC 15 0ºC A784MW157M1JLAV015 100 1,000 10,000 100,000 10 100 1,000 10,000 100,000 1,000,000 Z and ESR (mΩ) Frequency (Hz) Typical Z and ESR (f,T) - 150µF/63V A784MW157M1JLAV015 -55ºC Z 25ºC Z 150ºC Z -55ºC ESR 25ºC ESR 150ºC ESR 100 150 200 100 1,000 10,000 100,000 C (µF) Frequency (Hz) Typical C (f,T) - 150µF/63V A784MW157M1JLAV015 -55ºC 25ºC 150ºC
10© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Operational Life Typical capacitance and ESR curves of Polymer Hybrid V-Chip mounted on a standard Printed Circuit Board (PCB) at rated temperature TR and with rated ripple current IRAC applied: 0 500 1,000 1,500 Cap (20oC, 120 Hz), µF time, hrs. IAC=IRAC, TA=TR 0 500 1,000 1,500 ESR (20oC, 100kHz), mΩ time, hrs. IAC=IRAC, TA=TR 2xESR specified value ESR specified value
11© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 DC Life Formula Expected DC operational life (LOp, in k hour) can be calculated in accordance to the following equations: LOp = 6,000 × 10((125-T)/33) for TA lower or equal to 110°C LOp = 7,500 × 10((125-T)/42) for TA higher than 110°C Where: LOp: Life at maximum permissible operating temperature with rated operating voltage applied (k hour). Maximum LOp = 200 kh. TA: Ambient operating temperature (°C). Operational Life Operational Life (LOp) of a Polymer Hybrid V-Chip mounted on a Printed Circuit Board (PCB) at ambient temperature TA and ripple current IAC applied, can be converted from the diagram: 0.2 0.4 0.6 0.8 1.2 1.4 1.6 80 90 100 110 120 130 140 150 160 IAC/IRAC(150oC) TA , oC PCB (IRAC MAX )
12© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Landing Pad – Millimeters B A B C Diameter A B C 10 4.5 4.4 2.2 (Anti-Vibration) 4.5 4.4 4.6 Units in mm Marking Date Code* 1st Digits = Rated Voltage Letter = Year Code V = 2022 Final Digits = Week of the Year 01 = 1st week of the Year to 52 = 52nd week of the Year Year Code V 2022 W 2023 X 2024 Y 2025 Z 2026 A 2027 B 2028 Trademark Series Rated Voltage (VDC) Capacitance (µF) Date Code* (Last 3 Digits) Negative Polarity Marking
13© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Construction Detailed Cross Section Margin Rubber Seal Terminal Tabs Liquid Electrolyte Lead Terminal Tab Aluminum Can Anode Aluminum Foil, Etched, Covered with Aluminum Oxide (Second Layer) Cathode Aluminum Foil, Etched (Fourth Layer) Paper Spacer with Conductive Polymer (First Layer) Paper Spacer with Conductive Polymer (Third Layer) Rubber Seal Aluminum Can Lead (+) Lead (−)
14© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 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 ts tL td tp Reflow Number Temperature (°C) 150 – 180 ≥ 217 ≥ 230 260 1 250 1 or 2 Time (seconds) 60 – 120 ≤ 50 ≤ 40 ≤ 5 - Temperature Time ts td tp tL Peak 230 °C 217 °C 180 °C 150 °C
15© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Lead Taping & Packaging ØdØD 3±1 Size Code Diameter (mm) Length (mm) Reel Reel Quantity Box Quantityd (mm) D (mm) W1 (mm) ±3 ±2 ±2 MS 10 12.2 100 380 24 400 2,400 MW 10 16.5 100 380 24 250 1,500 MS (Anti-Vibration) 10 12.4 100 380 24 400 2,400 MW (Anti-Vibration) 10 16.7 100 380 24 250 1,500
16© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Taping for Automatic Insertion Machines Polarity – W±0.3 F±0.1 1.75±0.1 2.0±0.1 P±0.1 B0±0.2 T2±0.2 –0.0Ø1.5+0.1 Size Code D x L W P F B1 B0 T2
17© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 Lead line Rubber Case Anode foil Cathode foil Separator TerminalFloor Assembling Polymerization Slitting Winding Welding Chemical Treatment Forming Marking Aging Inspection V-chip forming and marking Packing Construction Data The manufacturing process begins with the anode foil being electrochemically etched to increase the surface area and then ‘formed’ to produce the aluminum oxide layer. Both the anode and cathode foils are then interleaved with absorbent paper and wound into a cylinder. During the winding process, aluminum tabs are attached to each foil to provide the electrical contact. The deck, complete with terminals, is attached to the tabs and then folded down to rest on top of the winding. The complete winding is impregnated with a conductive polymer electrolyte before being housed in a suitable container, usually an aluminum can, and sealed. Throughout the process, all materials inside the housing must be maintained at the highest purity and be compatible with the electrolyte. Each capacitor is aged and tested before being packed. The purpose of aging is to repair any damage in the oxide layer and thus reduce the leakage current to a very low level. Aging is normally carried out at the rated temperature of the capacitor and is accomplished by applying voltage to the device while carefully controlling the supply current. The process may take several hours to complete. Damage to the oxide layer can occur due to a variety of reasons:
- Slitting of the anode foil after forming
- Attaching the tabs to the anode foil
- Minor mechanical damage caused during winding
18© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 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 RESUL T 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.
19© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 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, 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.
20© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4120_A784 • 12/6/2022 Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com Surface Mount Hybrid Aluminum Polymer Capacitors A784, 150°C, Hybrid Polymer V-Chip, AEC-Q200 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 indicated or that other measures may not be required. KEMET is a registered trademark of KEMET Electronics Corporation.