4 layers118 × 44 mm
4 layers118 × 60 mm
Heron clock
Austin-Hunter1/HERON12026-2027 Graduate Project HERON:
- Size
- 118 × 60 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 112
- Nets
- 51
- Pads
- 318
- Tracks, vias
- 510, 491
- Pours
- 41
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 26 Aug 2026
- Updated
- 5 Nov 2026
Overview
Heron clock is an open-source printed circuit board by Austin-Hunter1, from the Austin-Hunter1/HERON repository on GitHub. It is a 4-layer board of 118 × 60 mm with 112 parts on 51 nets, routed with 510 tracks and 491 vias.
It is built around the SN74LVC125APWR-TP, LP5907MFX-3.3/NOPB(MS) and SN74LVC1G17DBVR, with the SIT5155AI-FK-33E0-10.000000, TLV75533PDBVR-MS and CC0603KRX7R7BB104 among its other parts. Its parts include 29 capacitors, 28 resistors, 13 diodes, 10 connectors and 8 inductors. It belongs with the lEDs and displays boards of this library.
Main components
12
SN74LVC125APWR-TP
TSSOP-14-40℃~+125℃ 1 1.65V~3.6V 40uA 50mA 50mA 6ns@3.6V,15pF 74LVC Power-off isolation、Output enable、Level shifting Schmitt trigger Tri-State Unidirectional TSSOP-14 Buffers, Drivers, Receivers, Transceivers ROHSTECH PUBLICBuffers, Drivers, Receivers, Transceivers
LP5907MFX-3.3/NOPB(MS)
SOT-23-5-40℃~+125℃@(Tj) 1 180mV@(300mA) 2uA 3.3V 300mA 5.5V Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMSKSEMIVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsSN74LVC1G17DBVR
SOT-23-5-40℃~+125℃ 1 1 1.2V、1.9V、2.3V、2.4V 1.65V~5.5V 100mV、300mV、400mV、550mV 10uA 32mA 32mA 74LVC 8.3ns@5V,50pF SOT-23-5 Logic Gates ROHSTECH PUBLICLogic GatesSIT5155AI-FK-33E0-10.000000
SMD5032-10PProgrammable OscillatorsSiTimeTLV75533PDBVR-MS
SOT-23-5SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMSKSEMIUncategorised
CC0603KRX7R7BB104
0603100nF 16V X7R ±10% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMT
AISC-0805-R82J-T
SMD,2.3x1.7mm180mA 23@50MHz 250MHz 820nH ±5% SMD,2.3x1.7mm Inductors (SMD) ROHSAbraconInductors (SMD)
RMCF0603FT22R0
0603-55℃~+155℃ 100mW 22Ω 75V Thick Film Resistor ±1% ±100ppm/℃ 0603 Chip Resistor - Surface Mount ROHSStackpole Electronics (SEI)Chip Resistor - Surface Mount
TPD1E05U06DYAR
SOT-5X3-40℃~+125℃ 0.42pF 1 10V 10nA 2.5A@8/20us 40W@8/20us 5.5V 8.5V IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 TVS Unidirectional SOT-5X3 ESD and Surge Protection (TVS/ESD) ROHSTexas InstrumentsESD And Surge Protection (TVS/ESD)
RC0603JR-070RL
UncategorisedUnknown maker
TPD1E10B06DYAR
SOT-5X3-40℃~+125℃ 1 100nA 12pF 14V 5.5V 6A@8/20us 6V 90W@8/20us Bidirectional ESD IEC 61000-4-2、IEC 61000-4-5 SOT-5X3 ESD and Surge Protection (TVS/ESD) ROHSTexas InstrumentsESD And Surge Protection (TVS/ESD)AC0603FR-0710KL
0603-55℃~+155℃ 100mW 10kΩ 75V Thick Film Resistor ±1% ±100ppm/℃ 0603 Chip Resistor - Surface Mount ROHSYAGEOChip Resistor - Surface Mount
README
README.mdHERON
Cloning
This repository uses git submodules. To pull everything, including submodule contents, clone with:
git clone --recurse-submodules https://github.com/Austin-Hunter1/HERON.gitIf you already cloned without that flag, run:
git submodule update --initSubmodules
- gps-tracking-example — linked from cu-sense-lab/gps-tracking-example (upstream reference; HERON's working copy is
gnss_processing/) - gnss_processing/submodules/gnss-tools — linked from cu-sense-lab/gnss-tools, used by
gnss_processing/ - HERON_WRITING — reports and papers, linked from Austin-Hunter1/HERON_WRITING
Where things are
HERON_DEPLOY_SOFTWARE/— the flight computer and ground station software (see itsREADME.md).gnss_processing/— the post-processing tools.docs/— project documents; start withdocs/GETTING_STARTED.md.SURGE/— the 2022 predecessor project, reference only.
GNSS Processing
gnss_processing is HERON's own working copy of gps-tracking-example
(notebooks and code edits for the UAS GNSS-R tracking pipeline — reacquisition after
data-drop overflows, navigation-message decoding across a stitched run, and related
fixes) kept as a plain folder here rather than a submodule, since this project does not
have push access to cu-sense-lab/gps-tracking-example. See its own
README for what differs from upstream.
Parts
112| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 100nF | Capacitor_SMD:C_0603_1608Metric | C2, C8, C10, C12, C16, C20, C24, C28, C29 |
| 8 | 270pF | Capacitor_SMD:C_0603_1608Metric | C13, C15, C17, C19, C21, C23, C25, C27 |
| 8 | 294R | Resistor_SMD:R_0603_1608Metric | R6, R8, R10, R12, R14, R16, R18, R20 |
| 8 | 820nH | Inductor_SMD:L_0805_2012Metric | L1, L2, L3, L4, L5, L6, L7, L8 |
| 6 | M3 | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4, H5, H6 |
| 5 | 22R | Resistor_SMD:R_0603_1608Metric | R3, R25, R26, R27, R28 |
| 5 | TPD1E05U06 | Diode_SMD:D_SOD-523 | D8, D10, D11, D12, D13 |
| 4 | 0R | Resistor_SMD:R_0603_1608Metric | R5, R9, R13, R17 |
| 4 | 17.4R | Resistor_SMD:R_0603_1608Metric | R7, R11, R15, R19 |
| 4 | 470pF | Capacitor_SMD:C_0603_1608Metric | C14, C18, C22, C26 |
| 4 | TPD1E10B06 | Diode_SMD:D_SOD-523 | D4, D5, D6, D7 |
| 3 | 10k | Resistor_SMD:R_0603_1608Metric | R2, R4, R21 |
| 3 | 10uF | Capacitor_SMD:C_0805_2012Metric | C1, C7, C9 |
| 3 | 1uF | Capacitor_SMD:C_0603_1608Metric | C3, C5, C11 |
| 3 | Fiducial | Fiducial:Fiducial_1mm_Mask2mm | FID1, FID2, FID3 |
| 2 | 1k | Resistor_SMD:R_0603_1608Metric | R1, R24 |
| 2 | 2.2uF | Capacitor_SMD:C_0603_1608Metric | C4, C6 |
| 1 | +3V3_CLK | TestPoint:TestPoint_Pad_D1.5mm | TP3 |
| 1 | +3V3_OSC | TestPoint:TestPoint_Pad_D1.5mm | TP2 |
| 1 | 100R | Resistor_SMD:R_0603_1608Metric | R22 |
| 1 | 49.9R | Resistor_SMD:R_0603_1608Metric | R23 |
| 1 | 500mA | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | 5V_IN | Connector_JST:JST_XH_S2B-XH-A-1_1x02_P2.50mm_Horizontal | J1 |
| 1 | BLM18PG221 | Inductor_SMD:L_0603_1608Metric | FB1 |
| 1 | CLK10_IN | TestPoint:TestPoint_Pad_D1.5mm | TP4 |
| 1 | GND | TestPoint:TestPoint_Pad_D1.5mm | TP7 |
| 1 | GRN PWR | LED_SMD:LED_0603_1608Metric | D3 |
| 1 | LMK1C1104PWR | Package_SO:TSSOP-8_4.4x3mm_P0.65mm | U4 |
| 1 | LP5907MFX-3.3/NOPB | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | OSC_OE | TestPoint:TestPoint_Pad_D1.5mm | TP5 |
| 1 | PPS_B200_1 | HERON_Clock:SMP_Amphenol_SMP-MSSB-PCT10T_Vertical_Float | J9 |
| 1 | PPS_B200_2 | HERON_Clock:SMP_Amphenol_SMP-MSSB-PCT10T_Vertical_Float | J10 |
| 1 | PPS_B210_1 | HERON_Clock:SMP_Amphenol_SMP-MSSB-PCT10T_Vertical_Float | J7 |
| 1 | PPS_B210_2 | HERON_Clock:SMP_Amphenol_SMP-MSSB-PCT10T_Vertical_Float | J8 |
| 1 | PPS_BUF | TestPoint:TestPoint_Pad_D1.5mm | TP6 |
| 1 | PPS_IN | Connector_Coaxial:SMA_Amphenol_132134_Vertical | J2 |
| 1 | REF_B200_1 | HERON_Clock:SMP_Amphenol_SMP-MSSB-PCT10T_Vertical_Float | J5 |
| 1 | REF_B200_2 | HERON_Clock:SMP_Amphenol_SMP-MSSB-PCT10T_Vertical_Float | J6 |
| 1 | REF_B210_1 | HERON_Clock:SMP_Amphenol_SMP-MSSB-PCT10T_Vertical_Float | J3 |
| 1 | REF_B210_2 | HERON_Clock:SMP_Amphenol_SMP-MSSB-PCT10T_Vertical_Float | J4 |
| 1 | SMF5.0A | Diode_SMD:D_SOD-123F | D1 |
| 1 | SN74LVC125APWR | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U6 |
| 1 | SN74LVC1G17DBVR | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | SS1030HEWS | HERON_Clock:D_SOD-323HE_Panjit | D2 |
| 1 | SiT5155AI-FK-33E0-10.000000 | HERON_Clock:SiTime_SiT5155_5.0x3.2mm_10L | U3 |
| 1 | TLV75533PDBVR | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | VIN_5V | TestPoint:TestPoint_Pad_D1.5mm | TP1 |
| 1 | YEL PPS | LED_SMD:LED_0603_1608Metric | D9 |
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Questions
How big is the Heron clock PCB?
It measures 118 × 60 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Heron clock use?
112 parts, built around the SN74LVC125APWR-TP, LP5907MFX-3.3/NOPB(MS), SN74LVC1G17DBVR and SIT5155AI-FK-33E0-10.000000. 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 Heron clock KiCad files?
From the Austin-Hunter1/HERON repository on GitHub, at the commit this page was made from: the board is Hardware/clock_board_revD/project/heron_clock.kicad_pcb and its schematic Hardware/clock_board/project/heron_clock.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Heron clock design in my own project?
Its repository states no licence, so its author keeps all rights: ask Austin-Hunter1 before reusing the design.