DMC961040R Discrete Semiconductor Products

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Bipolar transistors, arrays and pre-biased devices are all important elements within digital circuits. The DMC961040R pre-biased array is a great example, providing users with an array of four transistors that feature an integral biasing network. This makes the task of setting up an active loads much simpler and faster than having to bias each transistor individually. Let\'s examine what this device can do and how it works.

Types of Pre-Biased Transistor Arrays

Pre-biased transistors are typically available in two types, complementary or non-complementary. The DMC961040R is a non-complementary arrangement and has four of the same type of transistor connected in parallel. This provides the advantage of higher current density and improved power efficiency but may not be suitable for all applications due to the lack of cross-conduction protection. This means that if two of the transistors become active simultaneously they may cause each other to be unintentionally driven at the same voltage.

DMC961040R Features

The DMC961040R pre-biased array contains four n-channel MOSFET transistors with an integral biasing network and DC load resistance of 1000 ohms. This provides a steady current and voltage bias to the transistors to ensure a uniform operation. To ensure that the device’s output is protected from over-voltage and undershoot, four diodes are provided to provide a soft clipper circuit. The diodes also serve to provide a dampening effect, preventing EMF (electro-magnetic fields) from affecting the transistors. Additionally, the DMC961040R carries a guarantee of 17V breakdown with an operating temperature range of -40°C to 125°C.

Applications

Due to its compact form and anti-EMI features, the DMC961040R is ideal for power and logic applications in mobile and embedded systems. Common examples of applications that use this device are line-level switching, as used in audio pre-amps, and power-level switching, as found in power supplies, displays and audio amplifiers. It is also ideal for applications where multiple pre-biased transistors must be switched into and out of active loads.

Working Principle

The DMC961040R pre-biased array works by taking advantage of the natural differences in the on-resistances of a series of n-channel transistors in parallel. This results in the device providing an overall constant current and voltage output. The integral biasing network ensures that when a voltage is applied to one of the transistors, the voltage required to turn it on will be the same for all of them, thus providing uniform current and voltage output over the whole array.

The integral diode network provides a ‘soft clipper’ effect. This allows the device to be safely used in environments with large AC ripples or high EMI. The diodes also provide a dampening effect, which reduces the ‘ringing’ of the signal and prevents transients caused by AC components from causing EMF interference.

The combination of the integral biasing network and soft clipper protection means that the DMC961040R can be used in both high-speed power and logic applications. This versatility makes it ideal for use in embedded and mobile systems, and in applications where multiple pre-biased transistors are required.

In summary, the DMC961040R is an ideal choice for those applications where pre-biased transistor arrays and power switching are needed. The integral biasing network and diode network provide excellent protection from short-term transient events, while the uniform operation of the transistors ensures stable operation over the long term.

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