4 layers130 × 110 mm
4 layers100 × 65 mm
Si5351AVFO
etherkit/Si5351AVFOAfter any schematic change, run tools/exportdocs.sh (needs KiCad 10 kicad-cli). It rewrites docs/Si5351AVFOschematic.pdf, the netlist, SVGs and docs/erc.rpt.
- Size
- 100 × 65 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 140
- Nets
- 89
- Pads
- 513
- Tracks, vias
- 714, 407
- Pours
- 18
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 23 Oct 2026
- Updated
- 28 Oct 2026
Overview
Si5351AVFO is an open-source printed circuit board by etherkit, from the etherkit/Si5351AVFO repository on GitHub. It is a 4-layer board of 100 × 65 mm with 140 parts on 89 nets, routed with 714 tracks and 407 vias.
It is built around the ATTINY3226-SU, CP2102N-A02-GQFN24R and LP2985-33DBV, with the SI5351A-B-GT, CC0805KRX7R9BB104 and CL21A475KAQNNNE among its other parts. Its parts include 52 capacitors, 29 resistors, 9 inductors, 5 ICs and 5 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
12
ATTINY3226-SU
SOIC-20-300mil1.8V~5.5V 12bit 18 20MHz 32KB AVR SOIC-20-300mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
CP2102N-A02-GQFN24R
QFN-24-EP(4x4)-40℃~+85℃@(Ta) 1.3uA 3V~3.6V 9.5mA USB 2.0 USB to UART QFN-24-EP(4x4) USB Converters ROHSSilicon LabsUSB Converters
LP2985-33DBV
SOT-23-5-40℃~+125℃@(Tj) 1 150mA 16V 3.3V 30uVrms 45dB@(1kHz) 575mV@(150mA) 850uA Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown、Enable control、Noise bypass terminal Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
SI5351A-B-GT
MSOP-10-40℃~+85℃ 1.71V~3.6V 200MHz 3 I2C MSOP-10 Clock Generators, PLLs, Frequency Synthesizers ROHSSilicon LabsClock Generators, PLLs, Frequency Synthesizers
CC0805KRX7R9BB104
0805100nF 50V X7R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMTCL21A475KAQNNNE
080525V 4.7uF X5R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
LQW2UASR15F00L
1008150nH 580mA 700mΩ Unshielded Inductor ±1% 1008 Power Inductors ROHSMurataPower Inductors
CC0603KRX7R9BB104
0603100nF 50V X7R ±10% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMTLQW2UASR10G0CL
1008100nH 560mΩ 650mA Wire-wound inductor ±2% 1008 Power Inductors ROHSMurataPower InductorsCL21B105KBFNNNE
08051uF 50V X7R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMTCC0603FRNPO9BN200
060320pF 50V NP0 ±1% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMTCC0603FRNPO9BN330
060333pF 50V NP0 ±1% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMT
README
README.mdSi5351AVFO
Si5351A VFO board for the Si5351 Field Manual (Chapter 6).
Regenerating docs
After any schematic change, run tools/export_docs.sh (needs KiCad 10 kicad-cli).
It rewrites docs/Si5351AVFO_schematic.pdf, the netlist, SVGs and docs/erc.rpt.
Parts
140| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | 100n | Capacitor_SMD:C_0805_2012Metric | C2, C4, C5, C6, C14, C15, C17, C18, C19, C20, C21, C25, C28, C100, C120, C140 +1 |
| 13 | 10k | Resistor_SMD:R_0805_2012Metric | R12, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25 |
| 6 | NC | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP102, JP103, JP122, JP123, JP142, JP143 |
| 6 | NO | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP104, JP105, JP124, JP125, JP144, JP145 |
| 5 | 4.7u | Capacitor_SMD:C_0805_2012Metric | C3, C9, C16, C22, C23 |
| 4 | 150n | Inductor_SMD:L_1008_2520Metric | L2, L3, L5, L6 |
| 4 | M3 | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 3 | 0 | Resistor_SMD:R_0402_1005Metric | R100, R120, R140 |
| 3 | 120 | Resistor_SMD:R_0805_2012Metric | R101, R121, R141 |
| 3 | Fiducial | Fiducial:Fiducial_1mm_Mask2mm | FID1, FID2, FID3 |
| 2 | 100n | Capacitor_SMD:C_0603_1608Metric | C10, C13 |
| 2 | 100n | Inductor_SMD:L_1008_2520Metric | L1, L4 |
| 2 | 1k | Resistor_SMD:R_0603_1608Metric | R9, R29 |
| 2 | 1u | Capacitor_SMD:C_0805_2012Metric | C1, C7 |
| 2 | 20p | Capacitor_SMD:C_0603_1608Metric | C106, C126 |
| 2 | 33p | Capacitor_SMD:C_0603_1608Metric | C101, C121 |
| 2 | 39p | Capacitor_SMD:C_0603_1608Metric | C105, C125 |
| 2 | 4.7k | Resistor_SMD:R_0805_2012Metric | R27, R28 |
| 2 | 4.7u | Capacitor_SMD:C_0603_1608Metric | C11, C12 |
| 2 | 43p | Capacitor_SMD:C_0603_1608Metric | C104, C124 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | 68n | Inductor_SMD:L_1008_2520Metric | L8, L9 |
| 2 | 75p | Capacitor_SMD:C_0603_1608Metric | C102, C122 |
| 2 | 82p | Capacitor_SMD:C_0603_1608Metric | C103, C123 |
| 2 | 9.1p | Capacitor_SMD:C_0603_1608Metric | C107, C127 |
| 2 | BLM18PG221 | Inductor_SMD:L_0603_1608Metric | FB1, FB2 |
| 2 | GND | TestPoint:TestPoint_Pad_D1.5mm | TP1, TP2 |
| 2 | LP2985-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U1, U5 |
| 1 | +3V3D | TestPoint:TestPoint_Pad_D1.5mm | TP4 |
| 1 | +3V3_CLK | TestPoint:TestPoint_Pad_D1.5mm | TP5 |
| 1 | +3V3_OLED | TestPoint:TestPoint_Pad_D1.5mm | TP6 |
| 1 | +5V | TestPoint:TestPoint_Pad_D1.5mm | TP3 |
| 1 | 10 | Resistor_SMD:R_0805_2012Metric | R5 |
| 1 | 100n | Capacitor_SMD:C_0402_1005Metric | C26 |
| 1 | 10u | Capacitor_SMD:C_0805_2012Metric | C27 |
| 1 | 16p | Capacitor_SMD:C_0603_1608Metric | C145 |
| 1 | 18p | Capacitor_SMD:C_0603_1608Metric | C144 |
| 1 | 1N5711W | Diode_SMD:D_SOD-123 | D4 |
| 1 | 2.0p | Capacitor_SMD:C_0603_1608Metric | C147 |
| 1 | 22.1k | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 22u | Capacitor_SMD:C_1206_3216Metric | C24 |
| 1 | 24p | Capacitor_SMD:C_0603_1608Metric | C142 |
| 1 | 25MHz TCXO | Oscillator:Oscillator_SMD_SeikoEpson_SG8002CE-4Pin_3.2x2.5mm | X1 |
| 1 | 3.6p | Capacitor_SMD:C_0603_1608Metric | C141 |
| 1 | 30p | Capacitor_SMD:C_0603_1608Metric | C143 |
| 1 | 33n | Inductor_SMD:L_1008_2520Metric | L7 |
| 1 | 47.5k | Resistor_SMD:R_0603_1608Metric | R8 |
| 1 | 470 | Resistor_SMD:R_0603_1608Metric | R13 |
| 1 | 5.6p | Capacitor_SMD:C_0603_1608Metric | C146 |
| 1 | ATtiny3226-SU | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | U4 |
| 1 | CP2102N-A02-GQFN24 | Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm | U3 |
| 1 | EC11E18244A5 | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW1 |
| 1 | I2C_SCL | TestPoint:TestPoint_Pad_D1.5mm | TP7 |
| 1 | I2C_SDA | TestPoint:TestPoint_Pad_D1.5mm | TP8 |
| 1 | Logo_Open_Hardware_Small | EtherkitKicadLibrary:OSHWLogo4mm | LOGO2 |
| 1 | OLED_1.3in_SH1106_SPI_7pin | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | DS1 |
| 1 | RF_FENCE | EtherkitKicadLibrary:RF_Fence_42x33.5mm | SH1 |
| 1 | SMA CLK0 | EtherkitKicadLibrary:SMA-ENDLAUNCH | J2 |
| 1 | SMA CLK1 | EtherkitKicadLibrary:SMA-ENDLAUNCH | J3 |
| 1 | SMA CLK2 | EtherkitKicadLibrary:SMA-ENDLAUNCH | J4 |
| 1 | SOFT1 | EtherkitKicadLibrary:SW_Push_6x6mm_SMD_KH-6X6X11H-STM | SW2 |
| 1 | SOFT2 | EtherkitKicadLibrary:SW_Push_6x6mm_SMD_KH-6X6X11H-STM | SW3 |
| 1 | SOFT3 | EtherkitKicadLibrary:SW_Push_6x6mm_SMD_KH-6X6X11H-STM | SW4 |
| 1 | SP0503BAHT | Package_TO_SOT_SMD:SOT-143 | D1 |
| 1 | Si5351A-B-GT | Package_SO:MSOP-10_3x3mm_P0.5mm | U2 |
| 1 | UPDI | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J5 |
| 1 | USB_C_Receptacle | Connector_USB:USB_C_Receptacle_HCTL_HC-TYPE-C-16P-01A | J1 |
| 1 | Val** | EtherkitKicadLibrary:EtherkitLogoSmall | LOGO1 |
Questions
How big is the Si5351AVFO PCB?
It measures 100 × 65 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Si5351AVFO use?
140 parts, built around the ATTINY3226-SU, CP2102N-A02-GQFN24R, LP2985-33DBV and SI5351A-B-GT. 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 Si5351AVFO KiCad files?
From the etherkit/Si5351AVFO repository on GitHub, at the commit this page was made from: the board is PCB/Si5351AVFO.kicad_pcb and its schematic PCB/Si5351AVFO.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Si5351AVFO design in my own project?
Its repository states no licence, so its author keeps all rights: ask etherkit before reusing the design.
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