SV Microwave offers the industry’s most user-friendly RF cable builder application, you can specify and order RF cable assemblies on-line and they will ship in five (5) business days! Orders can be please via credit card or purchase order.
With over 125 in-stock, standard connector types (including VITA 67 contacts) and cable combinations available, SV’s RF Cable Builder tool will construct a cable assembly part number, generate a price quote, provide mechanical and electrical specifications, and offer downloadable cable data drawings.
For your RF connectivity needs, contact Cover 2 Sales to discuss SV Microwave!
Aluminum electrolytic capacitors are used in virtually all types of circuit designs. They are commonly used as filtering devices in power supplies. The following blog post includes a number of guidelines to follow when designing with and using electrolytic capacitors. The material has been paraphrased from United Chemi-con‘s technical topics published on their web sit e here.
- Aluminum electrolytic capacitors should not be used in AC applications.
- In DC applications, always confirm the polarity. If the polarity is reversed, the circuit life will be shortened or the capacitor may be damaged. Generally, an intermittent reverse voltage of 1V DC is allowed. Capacitors used in circuits whose polarity is occasionally reversed or whose polarity is unknown require the use of bi-polar capacitors.
Choose a capacitor whose maximum specified temperature is greater than the operating temperature of the application. This will increase the life of the capacitor. If the temperature rating of the capacitor is less than the temperature of the application, the life of the capacitor will be substantially less than expected or the capacitor could fail catastrophically.
In general, for each 10 degree decrease in operating temperature the capacitor life will double. Conversely, capacitor life will be halved for each 10 degree increase in temperature as determined by the following life expectancy formula.
Lx = Lifetime at actual operating temperature Tx
Lo = Lifetime at maximum rated operating temperature
To = Maximum rated operating temperature (°C)
Tx = Actual operating temperature (°C)
Ripple Current/Load Life
The life expectancy of an aluminum capacitor is not only determined by the ambient temperature, but also by the ripple current. The ambient temperature plus the increase in temperature due to ripple current equals the operating temperature.
Do not apply a ripple current exceeding the rated maximum ripple current allowed for the capacitors as do so will result in shortened capacitor life and may result in the capacitor venting or failing catastrophically.
In many cases capacitor heating due to ripple current is more severe than ambient temperature stress. An acceleration rate of approximately 2x for each 5-10°C temperature increase due to ripple current. The following formula used to determine life expectancy:
Lx = Lifetime under actual ambient temperature and actual ripple current
Lo = Lifetime under maximum rated operating temperature and rated DC voltage with no ripple
To = Maximum rated operating temperature (°C)
Tx = Actual ambient temperature (°C)
T = Inside temperature increase (°C) by actual ripple current
K = Acceleration factor, varied from 5 to 10 by product and conditions
If the applied voltage exceeds the rated voltage of the capacitor, the capacitor may be damaged from an increase in leakage current. When using a capacitor with an AC voltage superimposed on a DC voltage, care must be exercised so that neither the peak value of the AC voltage plus the DC voltage exceeds the rated voltage nor that the minimum AC voltage plus the DC voltage inverts the polarity on the capacitor.
When capacitors are connected in series, the voltage distribution across the series may not be uniform. This is due to the normal DC leakage distribution and should be considered in the design process by using a higher rated voltage capacitor and/or using balancing resistors in parallel with each series capacitor.
General purpose aluminum electrolytic capacitors are covered with a sleeve made of polyvinyl chloride or similar material. In addition to the insulating properties, the sleeving is also used for marking. The aluminum can is not insulated from the cathode, and when the internal element needs to be electrically insulated from the can, capacitors specially designed for these insulation requirements should be used. Also, the dummy terminal is not insulated from the cathode and must not be connected electrically to the anode or cathode.
Incorrect soldering may shrink or break the sleeving of the capacitor. Please read the following information carefully before soldering:
- If the soldering iron comes in contact with the capacitor body during wiring, damage to the polyvinyl sleeve and/or case may result in defective insulation or improper protection of the capacitor element.
- When soldering a printed circuit board, care must be taken so that the soldering temperature is not too high and the wave or soldering time is not too long. Otherwise, there will be adverse effects on the electrical characteristics and the insulating sleeve of aluminum electrolytic capacitors. In the case of miniature aluminum electrolytic capacitors, no harm will occur if the soldering process is performed at less than 260°C for less than 10 seconds.
- During soldering, the sleeve may melt or break if it comes in contact with the circuit board traces. To avoid this problem, do not locate circuit board traces under the capacitor body.
- The sleeving may be melted by solder which migrates up through the terminal holes in the circuit board. To avoid this problem, the same application as stated in item 3 is recommended.
- When soldering adjacent components to the capacitor, preheated lead wires or terminals may tear the capacitor sleeve if these terminals come in contact with the capacitor sleeve. Therefore, mount the capacitors carefully so that the adjacent components’ terminals or lead wires do not come in contact with the sleeve, particularly when mounting on through-hole circuit boards.
For surface mounting capacitors, the reflow soldering conditions are specified in the Surface Mount section of United Chemi-Con’s catalog.
If you have any questions about electrolytic capacitors, please contact Cover 2 Sales for assistance!
TDK-Lambda recently launched the CUS100ME series of AC-DC 100W power supplies. The series a ideal for B-rated and BF-rated medical equipment. Industrial (ITE) versions are also available. With C lass I and II (no earth ground connection) operation, the CUS100ME series meets both class B radiated and conducted emissions.
CUS100ME supplies are available with 12V, 15V, 18V, 24V, 28V, 36V and 48V outputs and they operates from an 85V to 264V universal AC input, Operating efficiencies up to 94% are achievable. It can be operated in convection, conduction, or foreced air cooling applications.
The open frame version is in the industry-standard 2″ x 4″ footprint. The CUS100ME is also available in a U-channel configuration. Cover or top fan options are also available.
All the power supplies are certified to IEC/EN/ES/CSA 60601-1, IEC/EN/UL/CSA 62368-1 and IEC/EN/UL/CSA 60950-1 with CE marking for the Low Voltage, EMC and RoHS Directives. CUS100ME units that meet IEC 61010-1 and EN 60355-1 are also available. Both Class I and Class II versions are compliant to EN 55011-B and EN 55032-B (radiated and conducted) and meet the EN 61000-3-2 harmonics, IEC 60601-1-2 Edition 4 and IEC 61000-4 immunity standards.
Product warranty is five years.
TDK Lambda is the leading manufacturer of medical and industrial power supplies worldwide. If you are working on a medical or industrial electronic design, the CUS100ME might be ideal for you!
Contact Cover 2 Sales to discuss your medical power supply requirements!
Grayhill designs and manufacturers intuitive human interface solutions that make life simpler, safer and more efficient. Standard products include optical encoders, rotary switches, keypads, joysticks and pushbuttons; all with finely tuned haptics. Grayhill specializes in creating ergonomic panels and product shells that integrate various interface technologies, including displays, touch technology and motion sensing.
Since their founding in 1943, Grayhill has been committed to providing top-quality human interface solutions for a wide range of applications. They were the first in their field to achieve ISO 9001 certification. More recently, Grayhll was among the first to be certified to the SAE AS9100 Revision D Quality Management System (QMS) for defense organizations. Grayhill is known for premium grade components and reliability. In-house electrical, mechanical, and environmental testing labs are keys in ensuring top quality products.
Grayhill also specializes in creating solutions that integrate multiple interface technologies, including displays, their own HMI components, and gesture-recognizing multi-touch technology.
SV Microwave is committed to providing the latest technologies to solve military and aerospace interconnect needs. Their high-density, high-frequency, push-on product portfolio offers ideal solutions to misalignment and tolerance stack-up challenges. And they are completely intermateable and interoperable with other industry-standard push-on interfaces. Designed for military, aerospace, space-flight, naval/marine and other high-reliability applications, these devices are the ideal solution for RF, microwave, and high-speed digital connectivity SV Microwave’s push-on connector offering includes:
- SMP (DC to 40GHz)
- SMPM (DC to 65GHz)
- SMPS (DC to 100GHz)
- PCB connectors, cable connectors, cable assemblies
- Single and multi-port solutions
- Full-detent and smooth bore options
Many of these standard solutions are readily available through SV’s extensive distribution network. SV Microwave is open to discussing custom connectivity solutions as well.