2 layers223.5 × 147.3 mm
4 layers271.8 × 147.3 mm
SF68
scefrom/SF682A board featuring the Motorola 68000
- Size
- 271.8 × 147.3 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 130
- Nets
- 191
- Pads
- 1,472
- Tracks, vias
- 2,908, 552
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 15 Jul 2025
- Updated
- 20 Sep 2026
Overview
SF68 is an open-source printed circuit board by scefrom, from the scefrom/SF68 repository on GitHub. It is a 4-layer board of 271.8 × 147.3 mm with 130 parts on 191 nets, routed with 2,908 tracks and 552 vias.
It is built around the 74HC541D, 74HC245D and 74HC32D, with the 74HC688D, 74HC08D and 74HC14 among its other parts. Its parts include 30 ICs, 21 resistors, 16 connectors, 11 capacitors and 3 switches.
Main components
12
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, Transceivers74HC245D
SO-20-300mil-40℃~+125℃ 1 160uA 2V~6V 7.8mA 7.8mA 74HC 8 9ns@4.5V,50pF Bidirectional Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
74HC32D
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 Gates74HC688D
SOIC-20-300mil-40℃~+125℃ 0.1V 0.5V、1.35V、1.8V 1.2V、2.4V、3.2V 1.9V、4.4V、5.9V 160uA 16ns@6.0V,50pF 2V~5V SOIC-20-300mil Digital Comparators ROHSNexperiaDigital Comparators74HC08D
SOP-14-40℃~+125℃ 1.5V~4.2V 1.9V、3.7V、5.2V 100mV、400mV 2 27ns@4.5V,50pF 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 74HC Series AND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates74HC14
SOP-14-40℃~+85℃ 1.9V、3.98V、4.4V、5.48V、5.9V 100mV、260mV、260mV 20uA 25ns@4.5V,50pF 2V~6V 6 74HC Noise suppression function Schmitt trigger SOP-14 Inverters ROHSJSMSEMIInverters74HC04D
SOP-14-40℃~+125℃ 1 1.5V~4.2V 1.9V、3.7V、5.2V 100mV、400mV、400mV 14ns@6V,50pF 2V~6V 2uA 5.2mA 5.2mA 500mV~1.8V 6 74HC SOIC-14 Inverters ROHSNexperiaInverters74HC05D
SOP-14-40℃~+125℃ 1 1.5V~4.2V 15ns@6V,50pF 2V~6V 2uA 5.2mA 500mV~1.8V 6 74HC SOIC-14 Inverters ROHSNexperiaInverters
74HC139D
SO-16-40℃~+125℃ 11ns@6.0V,50pF 160uA 2/4 2V~6V 74HC Decoder Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers74HC157D
SO-16-40℃~+125℃ 10ns@6.0V,50pF 160uA 2V~6V 5.2mA 5.2mA 74HC 8/4 Multiplexer Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers74HC273D
SOIC-20-300mil-40℃~+125℃ 1 12ns 15ns@4.5V,50pF 2V~6V 3.5pF 30MHz 3ns 74HC Series 8 8uA D-Type Reset Rising Edge SO-20-300mil Flip Flops ROHSNexperiaFlip Flops74HC74D
SOIC-14-40℃~+125℃ 1 15ns 2 2V~6V 3.5pF 37ns@6V,50pF 3ns、3ns、3ns 40uA 5.2mA 5.2mA 74HC Series 82MHz Asynchronous Complementary D-Type Rising Edge Set and Reset SOIC-14 Flip Flops ROHSNexperiaFlip Flops
Parts
130| Qty | Value | Footprint | References |
|---|---|---|---|
| 27 | C_Disc_D3.0mm_W1.6mm_P7.62mm | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P7.62mm | CB10, CB12, CB13, CB17, CB18, CB19, CB20, CB21, CB22, CB23, CB24, CB25, CB26, CB27, CB28, CB29 +11 |
| 9 | 4k7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R2, R3, R5, R6, R9, R10, R13, R15, R21 |
| 7 | 74HC541 | Package_DIP:DIP-20_W7.62mm | U1, U2, U6, U7, U20, U26, U29 |
| 6 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R1, R4, R7, R8, R18, R19 |
| 6 | MountingHole_3.2mm_M3_DIN965_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | M1, M2, M3, M4, M5, M6 |
| 5 | 22pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.54mm | C1, C2, C5, C6, C7 |
| 4 | CP_Radial_D5.0mm_P2.00mm | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | CB1, CB7, CB15, CB36 |
| 4 | C_Disc_D3.0mm_W1.6mm_P2.54mm | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.54mm | CB2, CB3, CB14, CB16 |
| 3 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C9, C10, C11 |
| 3 | 74HC32 | Package_DIP:DIP-14_W7.62mm | U19, U21, U23 |
| 3 | 74HC688 | Package_DIP:DIP-20_W7.62mm | U12, U15, U18 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R17, R20 |
| 2 | 28C256 | Package_DIP:DIP-28_W15.24mm | U4, U5 |
| 2 | 2k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R12, R14 |
| 2 | 74HC08 | Package_DIP:DIP-14_W7.62mm | U25, U28 |
| 2 | 74HC14 | Package_DIP:DIP-14_W7.62mm | U27, U30 |
| 2 | 74HC245 | Package_DIP:DIP-20_W7.62mm | U3, U8 |
| 2 | AS7C164A | Package_DIP:DIP-28_W7.62mm | U9, U10 |
| 1 | 100nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.54mm | C3 |
| 1 | 100uF | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C4 |
| 1 | 14k7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R16 |
| 1 | 20k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R11 |
| 1 | 220pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.54mm | C8 |
| 1 | 5k | Potentiometer_THT:Potentiometer_Bourns_3386P_Vertical | RV1 |
| 1 | 68HC000P10 | Package_DIP:DIP-64_W22.86mm | U11 |
| 1 | 74HC04 | Package_DIP:DIP-14_W7.62mm | U17 |
| 1 | 74HC05 | Package_DIP:DIP-14_W7.62mm | U22 |
| 1 | 74HC139 | Package_DIP:DIP-16_W7.62mm | U16 |
| 1 | 74HC157 | Package_DIP:DIP-16_W7.62mm | U13 |
| 1 | 74HC273 | Package_DIP:DIP-20_W7.62mm | U24 |
| 1 | 74HC74 | Package_DIP:DIP-14_W7.62mm | U14 |
| 1 | CP_Radial_D8.0mm_P3.50mm | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | CB11 |
| 1 | CXO_DIP8 | Oscillator:Oscillator_DIP-8 | X1 |
| 1 | Jumper_3_Bridged12 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 1 | LED_Filled | LED_THT:LED_D5.0mm_Horizontal_O3.81mm_Z3.0mm | D1 |
| 1 | LOGO | LOGO | G*** |
| 1 | Q_NPN_CBE | Package_TO_SOT_THT:TO-92 | Q1 |
| 1 | perslot1a | Connector_TE-Connectivity:55308437 | J4 |
| 1 | perslot1b | Connector_PCBEdge:55308432 | J13 |
| 1 | perslot2a | Connector_TE-Connectivity:55308437 | J3 |
| 1 | perslot2b | Connector_PCBEdge:55308432 | J12 |
| 1 | perslot3a | Connector_TE-Connectivity:55308437 | J2 |
| 1 | perslot3b | Connector_PCBEdge:55308432 | J11 |
| 1 | perslot4a | Connector_TE-Connectivity:55308437 | J1 |
| 1 | perslot4b | Connector_PCBEdge:55308432 | J10 |
| 1 | perslot5a | Connector_IDC:IDC-Header_2x30_P2.54mm_Horizontal | J8 |
| 1 | perslot5b | Connector_IDC:IDC-Header_2x15_P2.54mm_Horizontal | J15 |
| 1 | pwrjack | Connector_BarrelJack:BarrelJack_Horizontal | J14 |
| 1 | pwrsw | Button_Switch_THT:800CSP1B6M6QE | SW1 |
| 1 | ramslot1 | Connector_TE-Connectivity:55308437 | J5 |
| 1 | ramslot2 | Connector_TE-Connectivity:55308437 | J6 |
| 1 | ramslot3 | Connector_TE-Connectivity:55308437 | J7 |
| 1 | ramslot4 | Connector_TE-Connectivity:55308437 | J9 |
| 1 | ressw | Button_Switch_THT:800SP9B6M6RE | SW2 |
| 1 | romdrd | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP2 |
| 1 | stprobe | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J16 |
| 1 | timersw | Button_Switch_THT:SW_DIP_SPSTx01_Slide_9.78x4.72mm_W7.62mm_P2.54mm | SW3 |
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Questions
How big is the SF68 PCB?
It measures 271.8 × 147.3 mm and has 4 copper layers, 1.6 mm thick.
What parts does the SF68 use?
130 parts, built around the 74HC541D, 74HC245D, 74HC32D and 74HC688D. 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 SF68 KiCad files?
From the scefrom/SF68 repository on GitHub, at the commit this page was made from: the board is SF68.kicad_pcb and its schematic SF68.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SF68 design in my own project?
Its repository states no licence, so its author keeps all rights: ask scefrom before reusing the design.