UNR421800A Discrete Semiconductor Products

Resistor - Emitter Base (R2):	5.1 kOhms
Supplier Device Package:	NS-B1
Package / Case:	NS-B1
Mounting Type:	Through Hole
Power - Max:	300mW
Frequency - Transition:	150MHz
Current - Collector Cutoff (Max):	500nA
Vce Saturation (Max) @ Ib, Ic:	250mV @ 300µA, 10mA
DC Current Gain (hFE) (Min) @ Ic, Vce:	20 @ 5mA, 10V
Series:	--
Resistor - Base (R1):	510 Ohms
Voltage - Collector Emitter Breakdown (Max):	50V
Current - Collector (Ic) (Max):	100mA
Transistor Type:	NPN - Pre-Biased
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Box (TB)

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Introduction

The UNR421800A is a single-stage transistor with pre-biased (PNP-NPN) configuration that is designed for various applications in industrial and commercial equipment. Primarily, its purpose is to provide fast switching and improved system protection. This transistor is used in a wide range of motor control applications, such as controlling electric motors, replacing relays, and charging battery-powered systems. Design engineers can use this transistor to create an effective and reliable motor control system which is capable of withstanding high-voltage transients and inrush current.

Applications

The UNR421800A can be used in a variety of motor control applications, both in commercial and industrial applications. Some of the most common uses are in HVAC systems, resistive heating and electric motor control, as well as in electric drilling, electric welding and industrial pumps. In addition, the UNR421800A is often used in power supplies and battery charging applications, where fast switching and reliable performance are critical.

Working Principle

The UNR421800A works on the principle of transistor pre-bias. This type of transistor has two separate and distinct transistors within the same package, an NPN and a PNP. The two transistors are configured in a series and the base of each is connected to the collector of the other. This configuration has a number of advantages over more traditional transistors.First, the pre-biased transistor is extremely efficient in controlling current flow. It does this by using the base of the PNP to “pull” the current to a specific level, thus providing improved performance and reliability. Additionally, this type of transistor is also extremely fast in responding to voltage changes and sudden load conditions. It is also very effective in addressing large current surges and high-voltage transients. Additionally, the UNR421800A is designed to protect against overloads, meaning it will shut off in the event of an overcurrent or overvoltage situation. This provides an extra layer of protection against short circuit events or other faults.

Conclusion

Overall, the UNR421800A is a powerful, reliable and efficient transistor with pre-bias configuration. It can be used in a variety of motor control and power supply applications, where fast switching, improved protection, and reliable performance are essential. Design engineers can take advantage of its advanced features to create a robust and reliable system that is capable of withstanding high-voltage transients, inrush current, and overloads.

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