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

PNP PHOTO

IEC

IEC PNP phototransistor: photosensitive pnp transistor

A PNP phototransistor uses incident light to control a PNP transistor current path. The emitter arrow and supply orientation distinguish it from the NPN form. This entry identifies the photosensitive pnp transistor form in the publisher's IEC-context family.

Drawing use: Schematic
Application: Electronic components
Reference family: IEC / Manufacturer
Form evidence: Photosensitive PNP Transistor. Autodesk IEC-60617 Symbol Preview: Semiconductor Components, HDV1B6 / VDV1B6. This identifies the publisher's library context; exact IEC graphics and database identities are not asserted.

A distinction that matters

This entry adds the photosensitive pnp transistor detail to the broader PNP phototransistor family. A PNP phototransistor is different from a photodiode: its transistor action adds current gain, with different speed and bias requirements.

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.