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Diodes - Zener - Single

CMSZ5222B TR is a single Zener diode applicable for voltage regulating, surge and ESD protection, clamping and other applications. It operates at a single voltage which is independent of its current. The application field of CMSZ5222B TR includes electric and electronic equipment, automotive system and other applications which require protection against overvoltage.

Working Principle of CMSZ5222B TR

A Zener diode is a unique kind of diode that contains a PN junction with heavily doped regions on both sides of the junction. The high dopant levels increase the intrinsic electric field, which is the field created by the junction between the two materials. When a forward bias is applied to the diode, electrons in the n-side and holes in the p-side combine. When an electric field is applied to the junction that is greater than the intrinsic electric field, the junction’s barrier potential decreases, allowing an increased current flow.

When Zener diode is reverse-biased, electrons flow from the p-side to the n-side and this flow is restricted by the potential barrier. When the barrier potential is exceeded by the external electric field, a process known as Zener breakdown takes place and the internal electric field is inversely proportional to the current.

CMSZ5222B TR is a “Transfer-Rectifier” (TR) diode. It is used to suppress electrical noise and other unstable characteristics generated from the capacitor in power supplies and other sensitive electronic systems. A TR diode has a greater reverse junction breakdown voltage than a normal generic type Zener diode. This allows it to become less resistive to an applied electric field before breakdown occurs.

Due to its high voltage, low capacitance and greater surge current rating, CMSZ5222B TR can be used as a single clamping device that can provide both current and ESD protection, often eliminating the need for two components. It is mainly employed to suppress noise produced by AC line disturbances and switching transients from the power supply. It can also be used to limit over-voltage produced by the power-supply along with the recovery of the clamps.

Applications of CMSZ5222B TR

CMSZ5222B TR can be used for a variety of applications, such as:

• Voltage regulating
• Surge and ESD protection
• Clamping
• Power-supply noise suppressors
• Power supply over-voltage suppressors
• Transient voltage suppressors
• Light emitters (e.g. LED)
• Metering and measuring instruments
• Power supply protection systems
• Dynamic RAM, logic gates and other semiconductor devices
• Telecommunication systems
• Satellite communication systems
• Automobiles
• Television and radio antennae

Conclusion

CMSZ5222B TR is a versatile and powerful single Zener diode applicable for a wide range of applications in electric and electronic equipment, automotive systems and other over-voltage protection systems. It is different from other Zener diodes as it offers a greater reverse junction breakdown voltage than a generic type Zener diode, thus can better suppress noise generated by AC and switching transients, or suppress over-voltage produced by the power-supply. 

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