UPH2W181MHD

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Aluminum electrolytic capacitors are probably the most commonly used form of capacitors ever created. They have been used in a variety of electronic components and applications for several decades now, and are still commonly seen in many of today’s electronic devices. The UPH2W181MHD is one type of aluminum electrolytic capacitor, and it’s application and working principles are explained below.

Design and Construction

UPH2W181MHD capacitors are constructed with two aluminum sheets that are coated with a thin layer of electrolyte, and a thin spacer between them that allows the capacitor to hold the charge. The aluminum foil layers are usually connected with a dielectric material such as an impregnated paper. The capacitors come in two main types, polar and non-polar, with the polarity of the capacitor being determined by the orientation of the connecting electrolyte. Non-polar capacitors do not need to be oriented in one direction or another, but polar capacitors must have their positive and negative terminals oriented correctly in order to function properly. This is an important detail for anyone using these capacitors in their designs.

Uses and Applications

UPH2W181MHD capacitors have a below average self-healing capability and are recommended for use in a variety of electronic items, including:

• Low power DC-DC converters
• Battery chargers
• PC boards and computers
• Portable medical equipment
• Lighting
• Consumer electronics

Characteristics

UPH2W181MHD capacitors have the following characteristics:

• Capacitance: 18µF
• Voltage: 16V.DC
• Operating Temperature: -20℃ to +85℃
• Life: 2000hrs at +85℃
• Lead wire type: Sn/Pb
• Case Style: Cylindrical
• Size: 6x10mm
• Dissipation Factor: 0.1

Working Principle

UPH2W181MHD capacitors work on the principle that when a voltage is applied between the aluminum sheets, a charge is generated between them due to the electrolyte. This is known as current leakage, and it is used to store electrical energy. When a current is drawn from the capacitor, the accumulation of electrons on one side creates a potential difference across the capacitor, allowing it to store energy until the current is shut off and the charge dissipates. In addition, aluminum electrolytic capacitors have the advantage of allowing electricity to flow in one direction while blocking electricity in the other, making them useful for controlling power in circuits by filtering or bucking the current.

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