UMF21NTR Discrete Semiconductor Products

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Transistors - Bipolar (BJT) - Arrays, Pre-Biased - UMF21NTR application field and working principle

The UMF21NTR is a pre-biased array of nine bipolar junction transistors (BJTs) designed with integrated resistors and current limiting diodes configured to provide protected outputs. It is often used in applications where the output needs to be protected from voltage and current overloads. Specifically, this array can be used in the power supply, current control, and output protection circuits of general-purpose industrial, medical, and telecom machines.

The primary purpose of the UMF21NTR is to supply a steady current flow. Each transistor in the array has a bias voltage and a proper current limiting diode to provide the correct current, and these components create a homogeneous current flow through all transistors. The current limiting diodes in this array can also be set for a certain power supply voltage for the entire array.

One application area of the UMF21NTR is data communication in a wide range of industries. This array is used to provide output protection for industrial machines in order to protect the circuitry from short-circuit, over-current and under-voltage conditions. It is also used to create level shifters to buffer digital and analog signals, and as a buffer for communication ports. Additionally, UMF21NTR is used in mobile equipments, such as computers and cellular phones, because its small footprint can be used without compromising system performance.

The working principle of the UMF21NTR is based on the use of integrated resistors and current limiting diodes to provide controlled current flow. When a sufficient voltage is applied to each transistor through its dynamic VCB, current flow is established and regulated. The combination of VCB and current limiting diodes effectively protect each transistor in the array from getting over or under voltages or currents. This same protection also continues when power supplyoutput current is too low or toohigh, or if the dynamic VCBs become over or under-driven.

The UMF21NTR is also designed with an integrated thermal control system. This system provides a safe operating temperature for the array and helps to maintain stable current levels. In addition, the thermal control system also provides an adjustable maximum temperature set point, thereby helping to ensure optimal performance without compromising reliability or system safety.

In conclusion, the UMF21NTR is a versatile pre-biased array of BJTs with integrated resistors and current limiting diodes configured to supply a steady current. It is used for data communication in a wide range of different industries and applications where output protection is a must. Its integrated thermal control system helps to ensure optimal performance and system safety.

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