Common questions

Can two diodes be connected back to back?

Can two diodes be connected back to back?

No, two diodes connected back to back cannot be used as a transistor. A PN diode will have equal doping on both sides, but for a transistor, the base must have the least doping level and the emitter must be highly doped. Moreover, the transistor is monolithic, it cannot be constructed by connecting two diodes.

What is a back to back zener diode?

When the back-to-back arrangement of identical Zener diodes in series is connected to a DC voltage source, the following occurs: The reverse-biased diode runs in saturation, so it has the highest impedance, while the forward biased diode has the lowest impedance (due to Ohm’s law).

What happens when two diodes are connected in series?

When diodes are connected in series: The current through both the diodes remain the same and is equal to the total current flowing in the circuit. Hence the maximum current that a diode can withstand remains the same and does not change. In other words, the current-carrying capacity of the diode does not change.

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Can you use diodes in parallel?

It is not recommended to connect two diodes in parallel. Every diode has a slightly different forward voltage; even diodes with the same part number are not perfectly matched. If two diodes are connected in parallel, the one with the lower voltage drop will conduct most of the current.

Do transistors act as diodes?

Since a bipolar transistor is essentially two diodes, it can function as such. However, since bipolar transistors are not designed to be used as diodes, using them as diodes might cause a problem in terms of current and other ratings.

What is PNP diode?

The PNP transistor is a type of transistor in which one n-type material is doped with two p-type materials. Two crystal diodes are connected back-to-back in the PNP transistor. The emitter-base diode is located on the left side of the diode, while the collector-base diode is located on the right side.

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What is difference between diode and Zener diode?

A diode is a semiconductor device which conducts in one direction only. A Zener diode is a semiconductor device which conducts in forward biased as well as reversed biased. On the contrary, Zener diode is designed in a way that it can conduct in a reversed biased mode without getting damaged.

What is the difference between Zener diode and rectifier diode?

Rectifier diodes are used mainly for only allowing current/voltage to flow in one direction. Zener diodes work a little differently, they conduct in reverse and can then recover unlike rectifier diodes.

Why do we connect diodes in series?

Diodes are connected together in series to provide a constant DC voltage across the diode combination. The output voltage across the diodes remains constant in spite of changes in the load current drawn from the series combination or changes in the DC power supply voltage that feeds them.

How do diodes affect current?

A diode’s biasing affects current flow. Fundamentally, a diode is a component that permits current to flow in a single direction and blocks it in the other direction. Diodes allow current to flow in one direction without the effects of any impedance, while entirely blocking all flow of current flow in the other.

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What are ideal diodes?

An ideal diode is a diode that acts like a perfect conductor when voltage is applied forward biased and like a perfect insulator when voltage is applied reverse biased. So when positive voltage is applied across the anode to the cathode, the diode conducts forward current instantly.

Can you put two diodes in series?

Diodes in series with the same polarity each behave no differently than a single diode. The voltage drop and current capabilities of each diode remains the same. The overall voltage drop of the series combination of the diodes will be equal to the total of all of the diode voltage drops.