2 layers100 × 100 mm
2 layers100 × 100 mm
HC MemoryBoard
nasu8151/HC48Schematics and board of HC4 E (E means "for Education").
- Size
- 100 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 607
- Nets
- 78
- Pads
- 850
- Tracks, vias
- 754, 61
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 15 Jan 2025
- Updated
- 20 Aug 2026
Overview
HC MemoryBoard is an open-source printed circuit board by nasu8151, from the nasu8151/HC4 repository on GitHub. It is a 2-layer board of 100 × 100 mm with 607 parts on 78 nets, routed with 754 tracks and 61 vias.
It is built around the 74HC541D, 74HC138 and 74HC30S, with the 74HC32D and HM62256BLP-7 among its other parts. Its parts include 7 connectors, 5 ICs and 1 switch.
Main components
5
74HC541D
SO-20-300mil-40℃~+125℃ 1 12ns@4.5V,50pF 160uA 2V~6V 7.8mA 7.8mA 74HC 8 Output enable Tri-State Unidirectional SO-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
74HC138
SOP-160℃~+70℃ 24ns@5.0V,16pF 2V~6V 3/8 5.2mA 5.2mA 5uA 74HC Decoder Reverse function Single Supply SOP-16 Signal Switches, Multiplexers, Decoders ROHSGRSignal Switches, Multiplexers, Decoders
74HC30S
SOP-140℃~+60℃ 1 1.5V~4.2V 1.9V~5.9V 100mV 25ns@5.0V,15pF 2V~6V 5.2mA 5.2mA 5.5uA 500mV~1.8V 74HC Series 8 NAND Gate Push-pull SOP-14 Logic Gates ROHSGRLogic Gates74HC32D
SOP-14-40℃~+125℃ 1.5V~4.2V 1.9V、4.4V、5.9V 100mV、400mV、400mV 2 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 6ns@6V,50pF 74HC Series OR Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates
HM62256BLP-7
DIP28DIP28 New Arrivals ROHSHITUncategorised
README
HC4_KiCad_EE/README.mdParts
607| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 0.1u | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | CP1, CP2, CP3, CP4, CP5 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2, J6, J7 |
| 2 | Conn_01x08_Pin | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J3, J5 |
| 2 | Expantion_Connector | Connector_PinHeader_2.54mm:PinHeader_2x20_P2.54mm_Vertical | J1, J4 |
| 1 | 10k | Resistor_THT:R_Array_SIP9 | RN1 |
| 1 | 74HC138 | Package_DIP:DIP-16_W7.62mm | IC3 |
| 1 | 74HC30 | Package_DIP:DIP-14_W7.62mm | IC2 |
| 1 | 74HC32 | Package_DIP:DIP-14_W7.62mm | IC4 |
| 1 | 74HC541 | Package_DIP:DIP-20_W7.62mm | IC5 |
| 1 | Conn_02x17_Counter_Clockwise | Connector_PinHeader_2.54mm:PinHeader_2x17_P2.54mm_Vertical | JP1 |
| 1 | HM62256BLP | Package_DIP:DIP-28_W15.24mm | IC1 |
| 1 | Jumper_2_Bridged | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP2 |
| 1 | LOGO | LOGO | G*** |
| 1 | SW_DIP_x08 | Button_Switch_THT:SW_DIP_SPSTx08_Slide_9.78x22.5mm_W7.62mm_P2.54mm | SW1 |
| 1 | ~{IRQ} | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | TP1 |
The 27 most common of 607 parts.
More from nasu8151/HC4
2- 2 layers100 × 100 mm
Similar boards
- 2 layers315 × 147.4 mm
SteuereinheitBackgammonMoM
stonedDiscord/Automatenplatinen
Reverse engineerte Hardware aus deutschen Spielautomaten.
50 parts5BSD-2-Clause - 2 layers213.1 × 129 mm
- 2 layers
BreadBin
c0pperdragon/BreadBin
A CPU made of 7400 logic on breadboards - inside a bread bin ;-)
45 parts18 - 2 layers299.7 × 198.1 mm
Cisc-8
nailed-barnacle/Cisc-8-ttl-processor
A cut-down version of the 8080 processor using HCTTL and including a discrete ALU and instruction decoder
319 parts1MIT - 2 layers180 × 67.5 mm
- 2 layers131.9 × 164.6 mm
- 2 layers165 × 135 mm
- 2 layers142.2 × 99.1 mm
Questions
How big is the HC MemoryBoard PCB?
It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the HC MemoryBoard use?
607 parts, built around the 74HC541D, 74HC138, 74HC30S and 74HC32D. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the HC MemoryBoard KiCad files?
From the nasu8151/HC4 repository on GitHub, at the commit this page was made from: the board is HC_MemoryBoard/HC_MemoryBoard.kicad_pcb and its schematic HC4_KiCad/HC4_KiCad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the HC MemoryBoard design in my own project?
Its repository states no licence, so its author keeps all rights: ask nasu8151 before reusing the design.