Free AutoCAD electron tube, crystal and delay line symbols (DWG), IEC 60617-4 and -5 style

About IEC 60617-4 and -5

IEC 60617 is the international standard for graphical symbols for diagrams. Part 4 covers passive components and part 5 semiconductors and electron tubes. This library follows the figures for the parts that the electrical library does not have: the building elements of semiconductor symbols, junction effects, a few diodes and thyristors, detectors, crystals, delay elements, tube parts and the main tubes. Large tubes such as cathode-ray tubes and the klystron, and a few figures that could not be read with certainty, are not included.

These symbols are our own drawings after the figures of the standard. They are not copied from it, and the library is not certified against it. Check them against the standard, your company standard or your customer’s legend before you rely on a shape.

Frequently asked questions

How do I draw a triode or a pentode?

Use the blocks “Triode, direct heated” or “Pentode, indirect heated”: the envelope, anode, grids with dashed lines and the cathode with its heater are already drawn. Replace the reference and fill in TYPE, HEATER_V and ANODE_V. For other tube types start from the diode or tetrode and add electrodes.

Where are the ordinary diode, thyristor and transistor symbols?

In the electrical library (IEC 60617). This library adds what it lacks: the building elements for composing semiconductor symbols, the backward and bidirectional diodes and the diode thyristors.

Can I use the symbols in commercial projects?

Yes. They are free to use and modify in your own projects, including commercial ones. They are provided as is, without warranty.

Are cathode-ray tubes and klystrons included?

No. The large tube figures are not in this library; the standard draws them as complete assemblies. You can build one from the tube parts here, for example the electrodes, the envelope and the cathodes.

Can I change a symbol or add attributes?

Yes. Open the DWG, edit a block with BEDIT to change it or add attributes, and save. To update drawings that already contain the block, run ATTSYNC or replace the block. Make a backup first: attribute values can be lost if ATTSYNC is used carelessly.

Where do I find a ready-made set of these symbols for AutoCAD?

AutoCAD itself ships only a small set of sample blocks, so a full symbol set has to come from a library. Download the ZIP on this page and open the DWG: every symbol is a block. Insert one with INSERT (Blocks palette, Libraries tab, then pick the DWG) or drag it from DesignCenter (ADCENTER). You can also download a single symbol on its own.