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I am wondering what the effects are of putting diodes in parallel or putting them in series. (like current capabilities, voltage capabilities etc.) Let's say I have a datasheet of a diode. What characteristics would change ? My estimation is that putting parallel would increase the current capabilities, but may have a negative effect in reverse leakage. I have no idea if I am right or how to test it, so any info on diodes in parallel or series would be great.

5 Answers

Connecting diodes in series (AK-AK -- <-- <--) will increase the forward voltage of the resultant diode.

Connecting diodes in series (AK-KA -- <--> --) will cause an open circuit until peak inverse voltage (smallest diode) is applied on total resultant.

Connecting diodes in parallel (AK/AK -- <-- + -- <--) will increase the current carrying capacity of the diode. See 'Current Sharing' document below.

Connecting diodes in parallel (AK/KA -- <-- + --> --) will not get you a resultant diode conduction in both sides.

Diodes in parallel:

Diodes are frequently connected in parallel in switching power supplies in order to share the current. Here is a document on 'Current sharing in parallel diodes'.

Thermal Runaway really depends on the diode package and the heat-sink (dissipation) that they are mounted on. The diode in my hand right now has a maximum Tj of 150 C (Vishay STPS30L60CW-N3). Provided enough dissipation in the design, the design can deliver higher current in 'diodes in parallel'.

Putting diodes in series will add the diode drops together. Reverse leakage (and capacitance) should reduce in this configuration.

In parallel, the drop will stay the same (reverse leakage and capacitance will add), but the current capability may not be much higher, due to the possibility of thermal runaway (since as a diode gets hotter it's Vf drops, then it draws more current relative to the rest, gets hotter still, and so on). You can avoid this somewhat by placing the diodes in thermal contact with each other, and/or using a small resistor in series with each.

What you say is partially true, but putting two 600v diodes in series does not result in an effective 1200v working, unless you put current balancing resistors across each diode.

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. The current capability of the diodes does not change.

Diodes in parallel with the same polarity each behave no differently than a single diode. However, due to the fact that the current into each diode is lower because of the current divider rule, each diode will have less current flowing through it, and therefore its voltage drop will be lower, as this is a characteristic of diodes. Therefore, assuming the diodes are all very similar in Vf, the overall voltage drop of the parallel combination of diodes will be lower than it would be for a single diode. Although each individual diode's current capability does not change, the parallel combination of diodes can handle more current overall, once again because of the current divider rule.

Great illustration here: http://youtu.be/ZH4fs6xkWbk

diodes in series helps for voltage drop but to add resistors across each diode is recommendable in order get the rated drop otherwise the voltage drops would be different because same current will flow through every diode whereas the diodes in parallel helps for getting the required current rating and resistors in series to each diode is recommendable

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