RB085B-40TL Discrete Semiconductor Products

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Diodes - Rectifiers - Arrays, the phrase itself consists of three categories of gadgets, each of which plays a role in the manipulation of electrical current. The RB085B-40TL belongs to the family of Rectifiers; a component which can either block or allow current in a circuit depending on the direction of the current it is fed. Before understanding its application field and working principle, it is important to outline the basics of a diode, rectifiers and its array form.

Diode
A diode is a two-terminal electronic component which acts like a one-way switch when it comes to the flow of electrical current. When the positive terminal or anode of the diode is fed with current, the electrons begin to flow in the direction of the negative terminal or cathode providing an uninterrupted flow of current. However, when the current is directed from the negative terminal to the positive terminal, the diode blocks the current, prohibiting it from flowing in the opposite direction. This phenomena is attributed to the structure of the diode, consisting of two layers of semi-conductive material (usually silicon) and a junction between, collectively known as a depletion layer. The diode is an important component in electrical circuitry and it is most commonly used to protect electrical and electronic devices from damage as a result of reverse polarity.

Rectifier
Rectifier is a type of diode which acts as a current controlling device and allows controlled current flow in one direction. They are used in circuits which require the current to be unidirectional. There are two main types of rectifiers, the half-wave rectifier and the full-wave rectifier. The half-wave rectifier is a circuit in which only one half (positive or negative) of the sinusoidal input voltage is passed to the output. It is a simple and economic design but the efficiency of the rectification is only 50%. The full-wave rectifier is a circuit which sends both the positive and negative halves of the AC voltage to the output. This type of rectifier more efficient than the half-wave rectifier (77.5%) but requires two rectifiers and two additional components such as transformers and resistors.

Rectifier Array
A rectifier array or bridge rectifier is an integrated form of the rectifier in which multiple diodes and resistors are combined to form a single package. These components are pre-connected in such a way that the current is directed through them in a one-way direction. The main advantage of a rectifier array is that multiple rectifiers can be combined in a single package, thereby saving space, which in turn reduces cost and complexity. The disadvantage of a rectifier array is that the power dissipation capacity is limited.

RB085B-40TL
The RB085B-40TL is a type of rectifier array and it is specifically a Dual Common Cathode Shottky Barrier Array. It is a 4-pin package with 4 diodes internally connected in a symmetrical bridge circuit. The RB085B-40TL allows current to flow in one direction, while blocking it in the opposite direction.

Application Field
The RB085B-40TL is a relatively low power rectifier array and its applications generally lie in consumer electronics such as televisions, DVD players, A/V receivers and other similar portable electronic devices. The RB085B-40TL is also used in multiplexers, signal buffers and other circuits which require a one-way current flow.

Working Principle
The working principle of the RB085B-40TL is based on the rectification properties of the diodes. When current is fed to the anode of one of the diodes, it passes through the other diodes in the package and flows in a one-way direction to the cathode of the RB085B-40TL. This prevents any current from flowing in the opposite direction. In this way, the RB085B-40TL acts as a one-way current controlling gate.

The RB085B-40TL is a useful rectifier array for consumer electronics and many other applications which require one-directional current flow. It has the advantage of being a very compact form of rectification with 4 diodes in a single package. The working principle of the RB085B-40TL is based on the rectification properties of diodes, allowing the controlled current flow in one direction.

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