diode
Let an agent explain diodes, relay operation, types, characteristics and applications from electronics sources, describe the named types, and distinguish diodes from transistors, rectifiers as circuits, thyristors and resistors.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain diodes, relay operation, types, characteristics and applications from electronics sources, describe the named types, and distinguish diodes from transistors, rectifiers as circuits, thyristors and resistors.
A two-terminal electronic component that conducts current mainly in one direction, most commonly a semiconductor diode made from a p-n junction or a metal-semiconductor Schottky junction, with earlier forms the registry aliases name such as the vacuum diode, patented by John Ambrose Fleming in 1904, and the crystal detector or cat s whisker used in early radio, and types such as demodulation diodes, photodiodes that convert light into current, transient-voltage-suppression diodes that protect circuits from surges, Zener diodes and light-emitting diodes; diodes are used for rectification, signal detection, voltage regulation and protection. The registry lists diodes as both active and passive components, a classification that varies between sources.
What it is for: Controlling current direction in circuits.
It can be explain operation; relay types and characteristics; describe named types; relay applications.
Distinguishing features
Unidirectional conduction
Forward voltage drop
Reverse breakdown
Many specialised types
What it looks like
Small cylindrical or surface-mount components with a band marking the cathode, or glass vacuum tubes historically.
Physical character
silicon forward voltage: about 0.6-0.7 V - typical
Fleming valve patent: 1904 year
Schottky forward voltage: about 0.2-0.4 V - typical
How it is recognised
Two-terminal one-way conductor
Crystal detector, demodulation diode, transient-voltage-suppression diode, vacuum diode, semiconductor diode, photodiode
Transistors amplify and switch with three terminals; rectifiers are circuits; thyristors latch; resistors limit current in both directions
Related models
is a kind of - in registry terms
includes -
is used in -
is contrasted with -
In practice
Families and kinds
rectifier diodes
Schottky diodes
Zener and TVS diodes
photodiodes and LEDs
vacuum and crystal diodes
Standards and regulation
IEC 60747 semiconductor devices
JEDEC standards
RoHS restrictions on hazardous substances
Failure modes and hazards
Reverse polarity damage
Overheating and thermal runaway
Mains voltage shock in rectifier circuits
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What a diode is.
Science.
Definition
Definition.
Definition
Definition.
- What is a diode, and how does it differ from transistors, rectifiers, thyristors and resistors? definition
- Is someone working on mains-powered circuits, in which case they should isolate power and follow electrical safety rules? boundary
Types
Named types.
Types
Types.
- What are crystal detectors, vacuum diodes, demodulation diodes, TVS diodes and photodiodes? definition
- Which entry fits the specific type? action
Physics Physics.
Science.
P-n junction
P-n junction.
P-n junction
P-n junction.
- How does a p-n junction allow current in one direction? provenance
- Which references are standard? provenance
I-V curve
Characteristics.
I-V curve
I-V curve.
- What do forward voltage, reverse leakage and breakdown mean on an I-V curve? measurement
- Which sources are cited? provenance
History History.
Sources.
Vacuum
Fleming valve.
Vacuum
Vacuum.
- How did the Fleming valve detect radio signals? provenance
- Which entry fits Fleming valve? action
Crystal
Cat s whisker.
Crystal
Crystal.
- How did crystal detectors work in early radios? provenance
- Is the information accurate? boundary
Context Applications.
Regulation.
Power
Rectification.
Power
Power.
- How do diodes convert AC to DC in power supplies? provenance
- Which entry fits bridge rectifier? action
Protection
Surge protection.
Protection
Protection.
- How do TVS diodes protect electronics from surges and ESD? provenance
- Is the information current? boundary
What the second pass must settle
- Should the active versus passive classification be documented?
- Should photodiodes be a separate entry?
- How should datasheet parameters be linked?