B1161UCRP

Series:	Battrax®
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Voltage - Clamping:	Adjustable
Technology:	Mixed Technology
Number of Circuits:	1
Applications:	SLIC
Mounting Type:	Surface Mount
Package / Case:	6-SMD, Gull Wing
Supplier Device Package:	MS-013

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B1161UCRP Application Field and Working Principle

TVS - Mixed Technology is a way of creating and protecting electronic equipment, typically used in high power and high voltage environments. The B1161UCRP (also known as the Un-idirectional Crowbar Protection Circuit) is an example of a Mixed Technology product designed to protect a single power channel against potential high voltage spikes caused by a short circuit, transient, or lightning. In this article, we’ll discuss the application field of this device as well as its working principle.

Application Field

The B1161UCRP is a passive device and is not considered to be a semiconductor switch. As such, it is typically used in situations when semiconductor-based switches are not recommended because of their high switching power requirements, high peak currents, and slow response times. The B1161UCRP is often used in environments with high power demand (e.g. power supplies), where the current loads are high and voltage magnitude can vary. It is also seen in other scenarios, such as in electric vehicles, solar panels, LED lighting systems, and beyond.

Working Principle

The basic working principle of the B1161UCRP is quite simple. The device consists of four components: an internal instantaneous Zener diode, an internal resistance of about 470Ω, an external resistance, and a single output terminal. The Zener diode is responsible for short circuits and transients; it acts as a temporary safety barrier, protecting the power line during surges. The 470Ω resistor is used to sense current and set the trip point. The external resistor is used to customize the trip point according to the expected conditions.When a short circuit, transient, or lightning event occurrs, the instantaneous Zener diode conducts and the 470Ω resistor senses the current. This causes the voltage across the 470Ω resistor to rise, eventually exceeding the trip point voltage and triggering the turn-on of the B1161UCRP. The device then connects the output terminal to the ground, supplying the protection circuit with a low impedance path and ensuring the current doesn’t flow through the protected power channel.

Conclusion

The B1161UCRP is a Mixed Technology device designed to protect power channels against high voltage spikes caused by short circuits, transients, and lightning events. Its application field is wide, from power supplies to electric vehicles, LED lighting systems, and beyond. The device works by utilizing an internal instantaneous Zener diode, an internal 470Ω resistor, and an external resistor to sense current and set the trip point at which the device triggers and provides protection.

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