SSHB21HS-25021

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Common Mode Chokes

Common mode chokes, also known as electromagnetic interference (EMI) filters, are devices designed to reduce both the emission of interference from an electrical circuit and the susceptibility of the circuit to interference that impairs its operation. The SSHB21HS-25021 common mode choke is one such device that is designed to provide a high level of attenuation and filtering of the common mode interference emitted into the environment, as well as the sensitive electronics contained in the equipment.

Application Field

The SSHB21HS-25021 is a high performance, low profile common mode choke designed specifically for environment applications where large amounts of RF noise needs to be suppressed such as industrial, railway, medical, and telecommunication applications. It is particularly suitable for equipment in environments that are subject to lightning strikes and other high interference levels where high degree of common mode suppression is essential. This device is also ideal for use in such situations as large server rooms and other computer-based equipment.

Working Principle

The SSHB21HS-25021 common mode choke works by introducing a specific amount of inductance in the circuit. This inductance is designed to suppress the common mode noise on the power line by acting as a high pass filter at the frequency of the noise signal, and thus blocking the frequency components that constitute the noise from entering into the line. In addition, the filter also exhibits a high differential mode impedance which attenuates any differential mode noise present in the power lines.

In the SSHB21HS-25021, the primary components of the common mode choke are two inductors in series arrangement. These two inductors are designed such that when the common mode noise is present in the line, the inductance of the choke increases significantly, thus leading to increase in common mode impedance and suppressing the interference on the line. This helps protect the connected electronic devices from the EMI and ensure their proper functioning.

In addition, the SSHB21HS-25021 ensures a wide operation bandwidth, with standard on the shelf products having a bandwidth of 30MHz to 1GHz. This allows the device to effectively suppress a wide range of noise frequencies. The device also exhibits a high level of EMI attenuation with an insertion loss as low as -55dB for a frequency of 10MHz and as low as -35dB for a frequency of 1GHz.

Moreover, the SSHB21HS-25021 also offers superior resistance to reverse bias polarity. It can withstand up to 10V of reverse bias without any damage, thus making it ideal for use in high voltage surge environment.

Overall, the SSHB21HS-25021 common mode choke is designed to provide superior filtering performance and reliability in any environment which requires large amount of RF interference suppression. The device is suitable for a wide range of application such as industrial, railway, medical, and telecommunication applications and provides a high degree of common mode and differential noise suppression. It also has a wide operating bandwidth and exhibits high levels of EMI attenuation, as well as superior reverse bias resistance.

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