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'''Functional analog''' may refer to:
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{{split|Functional analog (electronic)|Functionoal analog (chemistry)}}
'''Functional analogs''' (or '''functional analogues''') are entities (models, representations or compounds)
that can be replaced, to fulfill the same function.
When the entities in question are formally represented by [[black boxes]], the concept of ''analog'' is related to "same behaviour": they take the same output sequence when submitted to the same input sequence.
* [[Functional analog (chemistry)]], chemical compounds that have similar physical, chemical, biochemical, or pharmacological properties
== Systems engineering==
* [[Functional analog (electronic)]], electronic entities that can be interchanged to fulfill the same function
[[Image:Thevenin equivalent.png|frame|right|Any ''black box'' containing resistances only, with voltage and current sources, can be replaced to a [[Thévenin's theorem|Thévenin equivalent circuit]], to show the same behavior.]]
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[[Analogical models]] are used in a method of representing a ‘[[open systems|target system]]’ by another, more understandable or analysable system.
Two systems have '''analog functions''' (see illustration) if the [[black box]] representation of both can be the same.
== Chemistry==
'''Functional analogs''' are [[chemical compound|compounds]] that have similar [[physics|physical]], [[chemistry|chemical]], [[biochemistry|biochemical]], or [[pharmacology|pharmacological]] properties. An example of a functional analog (and structural analog) is [[morphine]] and [[heroin]]. Functional analogs are not necessarily also [[structural analog]]s with a similar [[chemical structure]]. Examples are classes of [[drug]]s that have a similar mechanism of action.
== See also ==
* [[Black boxes]]
* [[Structural analog]]
[[Category:Chemical nomenclature]]
[[de:Analogon (Chemie)]]
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