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28C256 SOIC to 27C256 DIP

bkw777·aDIPters

28C256 SOIC to 27C256 DIP PCB layout, top view — open source board by bkw777
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About the 28C256 SOIC to 27C256 DIP PCB

28C256 SOIC to 27C256 DIP is an open source PCB design by bkw777, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 35.6 × 17.8 mm, with 4 components from 4 distinct parts.

Other key parts include the 28C256. By type, the board carries 1 IC, 1 connector, 1 jumper and 1 resistor.

It belongs with the retro computing designs in this gallery.

From the project

PCBs to plug various newer SMT parts into vintage DIP sockets. Generaly to use a newer PLCC, SOIC, or TSOP EEPROM or Flash part to replace a DIP mask ROM or UV EPROM in a vintage computer.

Most of the PCBs have holes that are intentionally too small to use standard pin headers for the DIP legs. Here is how to do the legs: https://gist.github.com/bkw777/52d85d89eeff8445cc667685d05ea94d It's less convenient than generic pin headers but the point is for the legs to be as thin as the DIP legs they are emulating so as not to damage sockets, and to have the replacement "chip" be low profile without the big isulator & shoulder block taking up space so the replacement chip fits in more places.

28C256 SOIC to 27C256 DIP, from the project README
From the project README

Main components on the 28C256 SOIC to 27C256 DIP

28C256

28C256 SOIC to 27C256 DIP bill of materials (BOM)

4 components, 4 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
28C256
U1
1
27C256 DIP LEGS
J1
1
Jumper_3_Bridged12
JP1
1
47k
R1

28C256 SOIC to 27C256 DIP design files

The KiCad project lives in the bkw777/aDIPters repository on GitHub; these links point at the commit this page was built from.

28C256 SOIC to 27C256 DIP: common questions

How big is the 28C256 SOIC to 27C256 DIP PCB?

The 28C256 SOIC to 27C256 DIP measures 35.6 × 17.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 28C256 SOIC to 27C256 DIP?

4 components, from 4 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the 28C256 SOIC to 27C256 DIP design files?

From the bkw777/aDIPters repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the 28C256 SOIC to 27C256 DIP design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which bkw777 chose for the repository.

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