Free AutoCAD flip-flop, counter and op amp symbols (DWG), IEC 60617-12 and -13 style

About IEC 60617-12 and -13

IEC 60617 is the international standard for graphical symbols for diagrams. Part 12 covers binary logic elements and part 13 analogue elements; both use rectangular symbols with qualifying symbols inside and at the connections. This library follows the figures for the general symbols and the common functional blocks. It does not contain the large device examples with a full set of pin numbers, and a few figures that could not be read with certainty were left out.

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 JK or D flip-flop?

Use the blocks “JK bistable, edge-triggered” or “D bistable, edge-triggered”. They show the inputs with the dynamic wedge, the reset input and the outputs. Add set and reset pins by copying a connection line, and replace the labels if your device uses other names.

Where are the basic AND, OR and NAND gates?

In the companion library of binary logic elements: the basic logic elements, the qualifying symbols and the dependency notation. This library continues from the compound gates, drivers, converters and functional blocks.

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 complete circuits with pin numbers included?

No. The large device examples of the standard, with a full set of pin numbers, are not in this library. Build them from the general symbols here and fill in PIN_NUMBERS and PART_NO of the element.

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.