BZX85B18-TAP

The BZX85B18-TAP is a single zener diode. With an operating temperature range of -20 to 110 °C, it is ideal for a variety of applications that require reliable and stable zener protection capabilities. The device is rated for an 18V zener voltage and a continuous power of 500mW at a 1/8W mounted on a suitable heat sink. It also features a peak operating pulse current of up to 50mA.

The BZX85B18-TAP is primarily used to provide overvoltage protection. It is used in applications where the input voltage can rise above the breakdown voltage of the diode, resulting in damage to adjacent components. The diode acts as a current limiter by providing a low resistance to any current increases up to the specified maximum current and diverting this current through the diode, away from the sensitive components. The device also serves to protect against static discharges and other transient surges.

The BZX85B18-TAP has a very low dynamic resistance and is capable of operating in both forward and reverse bias, making it suited for a variety of applications. It typically finds use in devices with long power-on time and/or high supply current, such as switching power supplies, automotive circuits, and telecommunications equipment. It is also widely used for circuit design and prototyping, in order to achieve reliable circuit protection.

The device has a simple working principle based on the ratio of forward and reverse diode current. In scenarios where the input voltage is above the breakdown voltage, the diode will conduct more forward than reverse current, and this ratio determines the amount of current that it can conduct safely. The diode also has a stabilizing effect, as the forward current combined with the reverse current forms an upper and lower limit on how much current can flow through the device, thereby limiting the maximum possible voltage.

Overall, the BZX85B18-TAP is widely used across a variety of applications due to its simple operation and reliable performance. Its low dynamic resistance, wide operating temperature range, and high pulse current rating make it ideal in applications where reliable overvoltage protection is required.