2 layers245.1 × 160 mm
8-Bit CPU 32k
slu4coder/Minimal-64x4-Home-Computer
My DIY TTL home computer with VGA and PS/2 and 4x the processing power of a Commodore C64 or Apple II.
139 parts326
Overview
The 74HC166D is a shift Register made by MDD in a SOP-16L package with 16 pins. SOP-16L Shift Registers ROHS.
PCBKit's library has its KiCad symbol (74xx:74LS166, from KiCad's library) and its footprint (Package_SO:SO-16_3.9x9.9mm_P1.27mm, from KiCad's library), ready for a KiCad board. 2,420 are in stock at JLCPCB (part C55059168). 30 open-source boards in 22 repositories on GitHub use it.
Symbol
Footprint
Parameters
2- Input Type
- StandardCMOS
- Resolution
- 8
Order codes
1- 74HC166DLCSC C55059168
Pinout
16| Pin | Name | Type |
|---|---|---|
| 1 | Ds | Input |
| 2 | A | Input |
| 3 | B | Input |
| 4 | C | Input |
| 5 | D | Input |
| 6 | CE | Input |
| 7 | Clk | Input |
| 8 | GND | Power in |
| 9 | Clr | Input |
| 10 | E | Input |
| 11 | F | Input |
| 12 | G | Input |
| 13 | Qh | Output |
| 14 | H | Input |
| 15 | PE | Input |
| 16 | VCC | Power in |
Open-source boards using it
All 30- 2 layers229.9 × 111.8 mm
- 2 layers306.1 × 130.2 mm
8-Bit CPU 32k
slu4coder/Minimal-64-Home-Computer
Legacy: Full TTL-only home computer with VGA and PS/2 and twice the processing power of a Commodore 64
132 parts94 - 2 layers62.9 × 50.8 mm
ArduinoPC
slu4coder/Minimal-Terminal
UPDATE 2026: Minimal UART Terminal with 50 x 30 characters VGA output and PS/2 keyboard
27 parts80 - 2 layers167 × 115 mm
- 2 layers188.3 × 114.3 mm
6502 Computer
The-Invent0r/6502-Computer-PCB
These are the PCB files for the modified BE6502 computer I put together.
34 parts31 - 2 layers177.8 × 130.8 mm
- 2 layers170.2 × 78.7 mm
ROsiM
hkzlab/ROsiM
ROsiM is a ROM simulator/emulator, supporting up to 512k/16bit ROMs
93 parts11GPL-3.0
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<iframe src="https://pcbkit.io/embed/parts/mdd/74HC166D" title="74HC166D in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/mdd/74HC166D.jpg" alt="74HC166D" width="1200" height="900">[](https://pcbkit.io/parts/mdd/74HC166D)Questions
Is there a KiCad symbol and footprint for the 74HC166D?
Yes. The symbol is 74xx:74LS166 and the footprint Package_SO:SO-16_3.9x9.9mm_P1.27mm, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the 74HC166D?
SOP-16L, with 16 pins. Its footprint is drawn on this page.
Where can I order the 74HC166D?
JLCPCB lists it as part C55059168, with 2,420 in stock; the sellers' links on this page open their listings.
What can replace the 74HC166D?
Parts like it in the library: the 74HC165D by Nexperia, the 74HC4094D by Nexperia, the 74HC595D-Q100 by Nexperia and the EM74HC166D by EnergyMath. Check their datasheets: a part that fits the footprint may still differ in its ratings.
Which open-source boards use the 74HC166D?
30 boards in 22 repositories on GitHub; the most starred are listed on this page, with their KiCad files.
Parts like it
8
74HC165D
SO-16-40℃~+125℃ 1 28ns@6V,50pF 2V~6V 35MHz 500mW 74HC 8 Parallel or Serial to Serial SOIC-16 Shift Registers ROHSNexperiaShift Registers74HC4094D
SO-16-40℃~+125℃ 1 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOIC-16 Shift Registers ROHSNexperiaShift Registers74HC595D-Q100
SO-16-40℃~+125℃ 1 100MHz 15ns@6V,50pF 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SO-16 Shift Registers ROHSNexperiaShift RegistersEM74HC166D
SOP-16LSOP-16L Shift Registers ROHSEnergyMathShift RegistersEM74HC594D
SOP-16LSOP-16L Shift Registers ROHSEnergyMathShift RegistersHTC74HC595S-R
SOP-16-40℃~+125℃ 1 2V~6V 35MHz 35mA 500mW 74HC 8 Push-Pull SOP-16 Shift Registers ROHSHITENXShift Registers74HC595D-HX
SOP-16SOP-16 Shift Registers ROHSZHHXDZShift RegistersSTPIC6D595M
SO-16-40℃~+125℃ 1 100mA 1087mW 4.5V~5.5V 8 90ns@5V,30pF Open-drain Serial-to-Serial or Parallel SO-16 Shift Registers ROHSSTMicroelectronicsShift Registers