Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

TUNNEL

IEC

IEC tunnel diode: tunnel diode

A tunnel diode has a heavily doped junction whose current-voltage characteristic includes a negative differential-resistance region caused by tunnelling. This entry identifies the tunnel diode form in the publisher's IEC-context family.

Drawing use: Schematic
Application: Electronic components
Reference family: IEC / Manufacturer
Form evidence: Tunnel Diode. Autodesk IEC-60617 Symbol Preview: Semiconductor Components, HDI1_S00645 / VDI1_S00645. This identifies the publisher's library context; exact IEC graphics and database identities are not asserted.

A distinction that matters

This entry adds the tunnel diode detail to the broader tunnel diode family. A tunnel diode is distinct from a Zener diode: the useful characteristic is its negative-resistance region rather than a specified reverse breakdown clamp.

Full reference

Symbols

Diode

A diode provides a semiconductor path with documented directional conduction characteristics. The schematic must identify anode, cathode and the intended circuit function.

Drawing use: Schematic
Application: Control circuits
Reference family: IEC / Manufacturer

A distinction that matters

A diode's reverse behaviour depends on its type and rating; it is not an ideal mechanical open contact.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.