As a rule, NO!
The main reason is thermal runaway:
When you warm up a diode, its "conductance" at any particular voltage increases.
(The Shockley diode equation gives the exact equation).
Even with two identical diodes in parallel, if the temperature of one diode was even slightly hotter than the other diode, more of the current would go through the hotter one. The one with more current would heat up more rapidly, lowering its conductance even more, and after a short time the hotter diode is hogging most of the current.
The final effect is that a diode will carry almost all the current, while the other stays almost unused.
There are a variety of things that cause two diodes to *not* be identical, which only speeds up the thermal runaway.
*the unavoidable imbalance between the two diodes voltage drops.
*(with an AC signal): the diode with slightly faster turn-on time will absorb more turn-on loss
*(with an AC signal): the diode with slightly slower turn-off time will absorb more turn-off loss
There is an obvious exception: use identical diodes, with exactly the same electrical and themal chracteristics. Individually selected diodes with voltage drop matched to less that one mV, and carefully assembled for thermal matching, may carry the same current, so effectively double the rating.
It is a very unstable condition, like keeping a coin vertical on a table.
Another arrangement is to add current sharing resistors in series to each diode, at least 0.3/0.4 V of additional voltage drop is required, so is a very unefficient solution.
Considering high frequency signals (as in switching power supply) adds even more problems, so the answer is always: use just one diode, leave the task of paralleling only to very skilled people dealing with such high currents that no single diode in the market can withstand.
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In a 2 dimensional plain they would have to be parallel in order to have no common point; in a 3 dimensional field they do not have to be parallel.
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Mainly diodes that handle a fair amount of power. When diodes are constructed in a "bridge", it usually means someone is trying to rectify AC to DC voltage in what is considered a "full wave". Both sides of the sine wave + and - are utilized to change the AC current into DC. Typically power diodes are used in this fashion. Crystal diodes or other types will not work in a bridge circuit as they cannot handle the amperage or wattage that typically is wanted. Power diodes are usually ones that handle 1 amp or more of current. Some power diodes can handle 60 amps or more if properly constructed in a heat sink dependent upon their ratings.
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