# IEC PNP phototransistor: photosensitive pnp transistor

Canonical URL: https://eloragrid.ai/symbols/iec-pnp-phototransistor-photosensitive-pnp-transistor
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: PNP PHOTO
Drawing use: Schematic
Reference families: IEC, Manufacturer

## Symbol convention

Convention: IEC
Form: 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.

PNP phototransistor form: Photosensitive PNP Transistor.

## In plain English

### What does IEC PNP phototransistor: photosensitive pnp transistor mean?

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.

### A simple example

A light-sensitive input stage can feed a conditioning circuit without a separately driven base connection. Check the emitter and collector assignments before following the measurement current. 

### What the drawings help you do

A PNP phototransistor is different from a photodiode: its transistor action adds current gain, with different speed and bias requirements.

### This particular reference

PNP phototransistor form: Photosensitive PNP Transistor. 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.

### Terms

- Terminal: An identified point where a conductor connects.
- Signal: Electrical information passed between devices, rather than necessarily the main power supply.
- Rating: A value stating the conditions for which equipment is specified.

Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference
A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.

- [AutoCAD Electrical: Semiconductor components](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-AC954072-7314-4682-88AF-38160D61E9A2.htm)


## What it represents

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.
A light-sensitive input stage can feed a conditioning circuit without a separately driven base connection. Check the emitter and collector assignments before following the measurement current. 
A PNP phototransistor is different from a photodiode: its transistor action adds current gain, with different speed and bias requirements.

## How to read it

- A light-sensitive input stage can feed a conditioning circuit without a separately driven base connection. Check the emitter and collector assignments before following the measurement current.
- A PNP phototransistor is different from a photodiode: its transistor action adds current gain, with different speed and bias requirements.

## Information to show or reference

- Identify terminal polarity and the required bias region.
- Reference the selected component characteristics and package pinout.
- Show the surrounding bias and signal-conditioning network.

## Important distinction

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.

## Facts

- Drawing form: Photosensitive PNP Transistor
- Public vendor block names: HDV1B6 / VDV1B6. Autodesk identifiers, not standards database IDs.
- Drawing purpose: PNP phototransistor
- Graphic scope: Independently authored educational illustration; not certified standard geometry, a terminal pinout or a product footprint.

## Public references

- [AutoCAD Electrical: Semiconductor components](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-AC954072-7314-4682-88AF-38160D61E9A2.htm) — Autodesk. Public Semiconductor Components table explicitly lists HDV1B6 / VDV1B6 with this operating or connection form. Vendor graphics are linked, not copied.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.