HM28-25025LF

Voltage Rating - AC:	250V
Package / Case:	Vertical, 4 PC Pin
Height (Max):	0.984" (25.00mm)
Size / Dimension:	1.181" L x 1.181" W (30.00mm x 30.00mm)
Mounting Type:	Through Hole
Features:	--
Approvals:	--
Ratings:	--
Operating Temperature:	--
Series:	HM28
Voltage Rating - DC:	--
DC Resistance (DCR) (Max):	2.6 Ohm
Current Rating (Max):	500mA
Inductance @ Frequency:	120mH @ 1kHz
Number of Lines:	2
Filter Type:	--
Part Status:	Discontinued at Digi-Key
Packaging:	Bulk

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Common Mode Chokes, also known as line filters, common-mode chokes and mains filters, are usually employed to suppress radio frequency interferences (RFI) and electromagnetic interference (EMI). The HM28-25025LF is a common mode choke designed for applications such as radio, communication and video equipment and various electronic equipment.The HM28-25025LF consists of a toroid core, wound with two conductors in either a series or parallel arrangement. The toroid can be made of a variety of materials, but ferrite is usually used in common mode chokes due to its high permeability and low loss characteristics. The ferrite material also helps reduce the amount of air gaps in the toroid core, which further increases the choking effect. The core also provides a magnetic field that acts to reduce the amount of current that circulates around the core.The exact construction and design of the HM28-25025LF greatly depend on the application. Typically, a shield is used around the choke to reduce the amount of stray fields that could leak into other electronic components. The choke is also usually wound with two separate conductors, one wound in a series and the other in a parallel arrangement, to reduce the amount of inductance in the system.The working principle of the HM28-25025LF is based on the same principle as most common mode chokes. The toroid provides an impedance pathway for current to flow in both the series and parallel configurations. This impedance pathway is proportional to the magnitude of the current flowing through the choke. As the current increases, the impedance also increases, causing the choke to become more efficient at blocking unwanted electromagnetic fields.Furthermore, the physical construction of the HM28-25025LF is such that it helps reduce the amount of stray fields that could leak into other electronic components. This is accomplished by the construction of the two separate conductors, so that the current flowing through them cancels each other out, forming an inductive loop. This inductive loop helps to form a barrier, preventing the RFI or EMI signals from being transferred into other components.The HM28-25025LF is designed for applications such as radio and communication equipment, video equipment and various electronic equipment. In these applications, the common mode choke helps to reduce the amount of interference that is caused by the outside sources. This helps to improve the overall performance of the system, as well as reduce the potential for damage to components due to interference.Overall, the HM28-25025LF is an ideal choice when it comes to suppressing unwanted RFI and EMI signals in radio, communication and video equipment. Its physical construction and working principle make it an effective tool in reducing the amount of interference in these applications, making it one of the most reliable solutions available on the market.

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