2 layers130 × 80 mm
4 layers15.8 × 39.8 mm
BUF802-probe
steinkohl/active-probe2GHz active FET probe build around the BUF802
- Size
- 15.8 × 39.8 mm
- Copper layers
- 4
- Thickness
- 1.58 mm
- Parts
- 54
- Nets
- 29
- Pads
- 192
- Tracks, vias
- 190, 82
- Pours
- 67
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 4 May 2026
- Updated
- 4 May 2026
Overview
BUF802-probe is an open-source printed circuit board by steinkohl, from the steinkohl/active-probe repository on GitHub. It is a 4-layer board of 15.8 × 39.8 mm with 54 parts on 29 nets, routed with 190 tracks and 82 vias.
It is built around the OPA140AID and BAT54. Its parts include 25 capacitors, 18 resistors, 5 connectors, 4 ICs and 1 diode. It belongs with the sensors and measurement boards and the FPGA and CPLD boards of this library.
Main components
2
OPA140AID
SOIC-8-18V~-2.25V、2.25V~18V -40℃~+125℃ 1 1.8mA 10pA 10pA 11MHz 120uV 140dB 1uV/℃ 20V/us 36mA 4.5V~36V 5.1nV/√Hz@1kHz Rail-to-rail output Reverse-phase input protection SOIC-8 Precision Op Amps ROHSTexas InstrumentsPrecision Op Amps
BAT54
SOT-23200mA 2uA@25V 30V 800mV@100mA Independent SOT-23 Schottky Diodes ROHSFOSANSchottky Diodes
README
README.mdactive-probe
2GHz active FET probe build around the BUF802. Schematic is copied from https://github.com/jmwilson/oshw-active-probe
Parts
54| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 10n | Capacitor_SMD:C_0402_1005Metric | C7, C8, C9, C20, C21, C24, C25 |
| 4 | 100n | probe-lib:CAPC0816X55N | C18, C19, C22, C23 |
| 4 | 4u7 | Capacitor_SMD:C_0805_2012Metric | C10, C11, C12, C13 |
| 3 | Conn_01x01 | Connector_Wire:SolderWirePad_1x01_SMD_1x2mm | J1, J2, J3 |
| 2 | 100n | Capacitor_SMD:C_0603_1608Metric | C16, C17 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric | R12, R13 |
| 2 | 22u | Capacitor_Tantalum_SMD:CP_EIA-3528-21_Kemet-B | C14, C15 |
| 1 | 100R | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 100p | Capacitor_SMD:C_0402_1005Metric | C5 |
| 1 | 10M0 | Resistor_SMD:R_0402_1005Metric | R7 |
| 1 | 10k0 | Resistor_SMD:R_0402_1005Metric | R10 |
| 1 | 10k2 | Resistor_SMD:R_0402_1005Metric | R16 |
| 1 | 17k8 | Resistor_SMD:R_0402_1005Metric | R9 |
| 1 | 18k | Resistor_SMD:R_0402_1005Metric | R17 |
| 1 | 1M60 | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | 1M91 | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | 1k | probe-lib:TRIM_PVG3A | RV1 |
| 1 | 1p1 | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | 1p3 | Capacitor_SMD:C_0402_1005Metric | C2 |
| 1 | 1u | Capacitor_SMD:C_0805_2012Metric | C6 |
| 1 | 330p | Capacitor_SMD:C_0402_1005Metric | C3 |
| 1 | 41k2 | Resistor_SMD:R_0402_1005Metric | R15 |
| 1 | 422k | Resistor_SMD:R_0402_1005Metric | R3 |
| 1 | 47p | Capacitor_SMD:C_0402_1005Metric | C4 |
| 1 | 49R9 | Resistor_SMD:R_0402_1005Metric | R14 |
| 1 | 51k0 | Resistor_SMD:R_0402_1005Metric | R11 |
| 1 | 5k60 | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | 66K5 | Resistor_SMD:R_0402_1005Metric | R6 |
| 1 | 68 | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 91k | Resistor_SMD:R_0402_1005Metric | R18 |
| 1 | BAT54 | Package_TO_SOT_SMD:SOT-23 | D1 |
| 1 | BUF802 | Package_DFN_QFN:VQFN-16-1EP_3x3mm_P0.5mm_EP1.68x1.68mm | U1 |
| 1 | Conn_01x02 | Connector_Wire:SolderWire-0.25sqmm_1x02_P4.2mm_D0.65mm_OD1.7mm | J4 |
| 1 | LTC3261 | Package_SO:MSOP-12-1EP_3x4.039mm_P0.65mm_EP1.651x2.845mm_ThermalVias | U4 |
| 1 | OPA140 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | Out | probe-lib:LINX_CONSMA001-SMD-G-T | J6 |
| 1 | TPS7A39 | Package_SON:Texas_DSC0010J_ThermalVias | U3 |
Questions
How big is the BUF802-probe PCB?
It measures 15.8 × 39.8 mm and has 4 copper layers, 1.58 mm thick.
What parts does the BUF802-probe use?
54 parts, built around the OPA140AID and BAT54. 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 BUF802-probe KiCad files?
From the steinkohl/active-probe repository on GitHub, at the commit this page was made from: the board is BUF802-probe/BUF802-probe.kicad_pcb and its schematic BUF802-probe/BUF802-probe.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the BUF802-probe design in my own project?
Its repository states no licence, so its author keeps all rights: ask steinkohl before reusing the design.
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