DMG964H50R

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DMG964H50R belongs to the class of bipolar junction transistors (BJT). It is a pre-biased transistor array which is used for various electronic and electrical applications. This article discusses the application fields and the working principle of DMG964H50R.

Application Fields and Design Features

DMG964H50R is a pre-biased BJT array, manufactured by STMicroelectronics (formerly SGS Thomson Microelectronics). It is a high-speed and low-power amplifier that consists of two NPN transistors (including biasing resistors) in a single 8-pin DIP package. It is designed for logic-level interfacing, voltage gain and audio amplification in portable applications. It supports 3.2MHz of maximum frequency with a minimum stand-off voltage of 4V.

One of the primary application fields of DMG964H50R is as a linear interface. The pre-biased array can be used for voltage buffering, power supply switching and signal conditioning in low-voltage automotive transceiver circuits. It is also used for logic-level interfacing between logic family and low power TTL inputs, providing isolation and noise immunity, which is essential to ensure signal integrity in sensitive electronics including sensors, microphones and receivers. In addition, DMG964H50R is applied in audio amplification, particularly in portable devices like handheld music players, mobile phones and other consumer electronics.

Working Principle

The pre-biased array of DM964H50R comprises two NPN transistors, each with a fixed base bias voltage of 4V, as shown in the figure below. By applying an input signal, the transistors will be turned on and off in accordance with the input voltage. The transistors will be activated when the input signal VIN is greater than 4V, and the transistor will turn off when the signal is less than 4V.

When the transistors are activated, the collector current will flow from the base to the collectors (output pins). The output voltage VOUT will be proportional to the input voltage VIN. Since DMG964H50R consists of two transistors in parallel, the output current will be doubled and the output voltage will be four times higher than the input voltage. This provides high voltage gain and improves signal to noise ratio.

In conclusion, DMG964H50R is a high-speed, low-power pre-biased amplifier designed for logic-level interfacing and audio amplification in various applications. It is able to provide high voltage gain with excellent signal isolation and noise immunity capabilities.

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