SMBJ350

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The SMBJ350 device is a uni-directional, bi-directional, or two uni-directional voltage suppressor diode, offering a very low capacitance and high peak power rating. It is a highly versatile two-terminal diode that can withstand high pulse power while also allowing very efficient clamping of high-voltage, short duration transients. The diode is packaged in a variety of standard packages including standard SMA, SMB, and SMC sizes, as well as an array of surface mount packages. This diode is widely used in a variety of applications including telecommunications, military, medical, automotive, and consumer electronics.

In terms of application fields, the SMBJ350 device can be found in various commercial, automotive, and consumer electronic applications. Email servers and routers, which have high-speed communications lines, should take advantage of this diode’s low capacitance (which minimizes crosstalk to an acceptable level) and power handling capabilities (widely used to suppress voltage transients). Furthermore, this diode is widely used in high-voltage environment, especially in high-power loads like UPS systems and inverters. It is also an ideal choice for automobiles, as its low capacitance and low profile helps minimize inductance in very tight spaces. Moreover, consumer electronics can make use of its high peak rating of 400 W, allowing it to be used for applications such as surge protection, over-voltage protection, and ESD protection.

In terms of working principle, the SMBJ350 device is a transient voltage suppressor diode based on Silicon Avalanche Diode (SAD) technology. This diode’s construction consists of a heavily doped PN junction with a highly resistive junction and low capacitance layer which ensure instantaneous clamping of high-voltage short-duration signals. The diode operates by clamping the voltage when the forward junction threshold voltage is exceeded by applying a voltage across the device. The magnitude of the clamped voltage is proportional to the applied voltage and is limited by the stand-off voltage, usually rated 5 kV to 400 V. This diode is able to supply both clamping and a low capacitance path to adjacent circuitry.

In conclusion, the SMBJ350 device is a two-terminal diode capable of withstanding high pulse power and a variety of operations including clamping of high-voltage transients, protection against surge, overvoltage, and ESD. It is suitable for various applications fields including telecom, military, medical, and automotive, with its highly versatile and robust design.

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