74HC18
About the 74HC18 PCB
74HC18 is an open source PCB design by baleshwarece-jpg, published on GitHub. It is a 2-layer board measuring 51.5 × 30 mm, with 21 components from 6 distinct parts.
Other key parts include the 74HC138. By type, the board carries 8 diodes, 8 resistors, 3 connectors, 1 IC and 1 crystal.
It belongs with the dev boards & breakouts designs in this gallery.
From the project
30-Days-PCB-Design-Challenge
Day 28 / 30 — 30-Day PCB Design Challenge
A breakout board for the 74HC138, a 3-to-8 line decoder/demultiplexer commonly used to extend a microcontroller's limited GPIO count into multiple chip-select lines for SPI peripherals, address decoding in memory-mapped designs, or driving up to 8 mutually-exclusive outputs from a 3-bit binary code.
Many projects reach a point where a microcontroller runs out of dedicated chip-select or enable lines before it runs out of other I/O — a common case being multiple SPI devices on a shared bus, each needing its own CS line. Wiring 8 separate GPIOs as…
Main components on the 74HC18
74HC18 bill of materials (BOM)
21 components, 6 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74HC138 | DIP-16_W10.16mm_LongPads | U1 |
| 1 | Conn_01x08_Pin | PinSocket_1x08_P2.54mm_Vertical | Y7 |
| 2 | Conn_01x03_Pin | PinSocket_1x03_P2.54mm_Vertical | J1, J2 |
| 1 | Conn_01x02_Pin | PinHeader_1x02_P2.54mm_Vertical | J4 |
| 8 | LED | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2, D3, D4, D5, D6, D7, D8, D9 |
| 8 | R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4, R5, R6, R7, R8 |
74HC18 design files
The KiCad project lives in the baleshwarece-jpg/PCB_PROJECTS repository on GitHub; these links point at the commit this page was built from.
74HC18: common questions
How big is the 74HC18 PCB?
The 74HC18 measures 51.5 × 30 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the 74HC18?
21 components, from 6 distinct parts. The full bill of materials is listed on this page.
Where can I download the 74HC18 design files?
From the baleshwarece-jpg/PCB_PROJECTS repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the 74HC18 design in my own project?
The repository has no license, so all rights stay with baleshwarece-jpg. Use it as a reference, and ask the author before reusing the design.
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