5KP18-B Circuit Protection

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A TVS (Transient Voltage Suppressor) diode is designed to protect a device, circuit or system from surges in voltage and current that may cause electrical noise or damage. The 5KP18-B is a member of the 5KP series of TVS Diode devices from Littelfuse, Inc. This device offers protection against voltage spikes and is designed to meet ISO 7637-2 (pulse 2E) and ISO 7637-4 (pulse 5A) automotive EMC requirements.

The 5KP18-B is a two-lead, surface-mount, unidirectional TVS diode with a low working voltage of 18V. The device provides superior ESD protection, with a rated Clamping Voltage (VC) of 46V. The device is capable of handling surge current pulses of up to 200A. The 5KP18-B has high reliability and small size, making it perfect for high-density PCB design. The device is also RoHS compliant.

When a 5KP18-B is exposed to an overvoltage, the device responds and clamps current, providing protection for the application. The device is designed to trigger at a predetermined break-over voltage. This voltage is determined by the device’s internal circuitry. During a voltage surge, the 5KP18-B acts as a protection element, limiting the voltage applied to and protecting the protected device or system.

The 5KP18-B is most commonly used for automotive applications. Automotive EMC protection calls for surge suppression and transient voltage. The 5KP18-B is designed to meet demanding EMC requirements and provides protection from transients due to EFT, EMP, and other electromagnetic pulses. Additionally, the device’s low working voltage makes it suitable for a variety of automotive applications, such as electric/hybrid vehicle power supplies and fuel injection systems.

The 5KP18-B is suitable for many other applications, including appliances, power sources and other consumer electronics. In all of these applications, the protection provided by the 5KP18-B reduces stress on upstream components and ensures reliable operation. The device’s high surge current capability is also a benefit in consumer electronics, ensuring that it can handle the heavy power loads of newer devices.

The 5KP18-B is designed to work in both normal and abnormal conditions. In normal conditions, the voltage across the device is greater than the rated working voltage of the device, and the device remains off. In abnormal conditions, the device is activated and the voltage across the device is clamped at the rated Clamping Voltage (VC). The device will remain in clamp mode until the voltage returns to a safe level.

The 5KP18-B is a reliable and efficient device for protecting a wide variety of applications and systems from surge and voltage transients. The device’s low working voltage and high surge current capability make it a perfect choice for automotive EMC, as well as a wide variety of other applications. Its small package size and RoHS compliance also make it a great choice for PCB designers.

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