

FIC-100A
USB IR Adapter compatible with Fluke 287 and 289 series multimeters
- Size
- 40 × 25 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 40
- Nets
- 34
- Pads
- 117
- Tracks, vias
- 167, 70
- Pours
- 72
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 24 Apr 2026
- Updated
- 29 Jul 2026
Overview
FIC-100A is an open-source printed circuit board by Reemuson, from the Reemuson/FIC-100A repository on GitHub, published under the CERN-OHL-W-2.0 licence. It is a 2-layer board of 40 × 25 mm with 40 parts on 34 nets, routed with 167 tracks and 70 vias.
It is built around the FT231XS-U, LM393ADT and USBLC6-2SC6, with the LTST-C170KGKT, T491A475K025AT and PT334-6C among its other parts. Its parts include 12 resistors, 6 capacitors, 5 diodes, 3 ICs and 1 transistor. It belongs with the sensors and measurement and interfaces and adapters boards of this library.
Main components
8FT231XS-U
SSOP-20-150mil-40℃~+85℃ 125uA 5V 8mA USB 2.0 USB to UART SSOP-20-150mil USB Converters ROHSFTDIUSB ConvertersLM393ADT
SO-8-18V~-1V、1V~18V 0℃~+70℃ 1.3us 100nA 2 2.5mA 2V~36V 2mV 36V 3nA Open-drain TTL、CMOS SO-8 Comparators ROHSSTMicroelectronicsComparatorsUSBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)LTST-C170KGKT
0805-55℃~+85℃ 130° 20mA 2V 35mcd 571nm 574nm 75mW Discrete Diode Water Clear Yellow Green 0805 LED Indication - Discrete ROHSLite-OnLED Indication - DiscreteT491A475K025AT
CASE-A-3216-18(mm)-55℃~+125℃ 25V 4.7uF 6Ω ±10% CASE-A-3216-18(mm) Tantalum Capacitors ROHSKEMETTantalum CapacitorsPT334-6C
插件,D=5mm-25℃~+85℃ 0.4V@2mA 100nA 20mA 30V 75mW 940nm NPN 插件,D=5mm Phototransistors ROHSEverlight ElectronicsPhototransistorsTSAL6100
插件,D=5mm-40℃~+85℃ 1.35V、2.2V 100mA 10° 160mW 30nm 5V 80mW/sr@IF=100mA 940nm 插件,D=5mm Infrared LED Emitters ROHSVishay IntertechnologyInfrared LED EmittersUSB4105-GF-A
SMD-40℃~+85℃ 1 12P 48V 5A Black Female Surface Mount, Right Angle Type-C USB 2.0 SMD USB Connectors ROHSGlobal Connector Technology (GCT)USB Connectors
README
README.md
FIC-100A
SPECIFICATIONS
| Parameter | Value |
|---|---|
| Dimensions | 40.0 × 25.0 mm |
PRODUCT IDENTIFICATION
Public model identifier: FIC-100A
Recommended description: USB IR Adapter compatible with selected Fluke multimeters
This project uses a simple function-based product numbering style. FIC identifies the Fluke-compatible infrared cable family, and 100A identifies this product generation.
This project is an independent, third-party design compatible with selected Fluke instruments. It is not made by, endorsed by, sponsored by, or affiliated with Fluke Corporation. Fluke is a trademark of Fluke Corporation.
DIRECTORY STRUCTURE
.
├─ Computations # Misc calculations
├─ HTML # HTML files for generated webpage
├─ Images # Pictures and renders
│
├─ kibot_resources # External resources for KiBot
│ ├─ colors # Color theme for KiCad
│ ├─ fonts # Fonts used in the project
│ ├─ scripts # External scripts used with KiBot
│ └─ templates # Templates for KiBot generated reports
│
├─ kibot_yaml # KiBot YAML config files
├─ KiRI # KiRI (PCB diff viewer) files
│
├─ lib # KiCad footprint and symbol libraries
│ ├─ 3d_models # Component 3D models
│ ├─ lib_fp # Footprint libraries
│ └─ lib_sym # Symbol libraries
│
├─ Logos # Logos
│
├─ Manufacturing # Assembly and fabrication documents
│ ├─ Assembly # Assembly documents (BoM, pos, notes)
│ │LEGAL
This repository contains open hardware design files, protected project branding, and third-party workflow content.
- The primary hardware licence is the CERN Open Hardware Licence Version 2 - Weakly Reciprocal (
CERN-OHL-W-2.0). SeeLICENSE. - Project-specific scope notes, branding exclusions, compatibility wording, non-affiliation wording, and safety notes are in
NOTICE.md. - Third-party copyright and licence notices are preserved in
THIRD_PARTY_NOTICES.md.
This project is an independent, third-party design compatible with selected Fluke instruments. It is not made by, endorsed by, sponsored by, or affiliated with Fluke Corporation. Fluke is a trademark of Fluke Corporation.
This is a hardware/electronics project. Anyone building, modifying, testing, selling, or using the design is responsible for verifying isolation, creepage and clearance, electrical safety, regulatory compliance, and fitness for purpose.
Parts
40| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100n | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C5 |
| 4 | MOUNT_M2.5 | MountingHole:MountingHole_2.7mm_M2.5_ISO7380_Pad | H1, H2, H3, H4 |
| 3 | 4.7k | Resistor_SMD:R_0603_1608Metric | R1, R2, R5 |
| 3 | FIDUCIAL | Fiducial:Fiducial_1mm_Mask2mm | FID1, FID2, FID3 |
| 3 | LED | LED_SMD:LED_0805_2012Metric | D3, D4, D5 |
| 2 | 27 | Resistor_SMD:R_0603_1608Metric | R8, R9 |
| 2 | 270 | Resistor_SMD:R_0603_1608Metric | R10, R11 |
| 2 | 5.11k | Resistor_SMD:R_0603_1608Metric | R6, R7 |
| 1 | +3V3 | RD-Testpoints:TestPoint_Pad_D1.0mm | TP2 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 10n | Capacitor_SMD:C_0603_1608Metric | C4 |
| 1 | 220 | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 4.7u | Capacitor_Tantalum_SMD:CP_EIA-3216-18_Kemet-A | C6 |
| 1 | 619 | Resistor_SMD:R_0603_1608Metric | R12 |
| 1 | BLM18KG601BH1D | Inductor_SMD:L_0603_1608Metric | FB1 |
| 1 | BOARD_STACKUP_MARKER | RD-Symbols-Silkscreen:STACKUP_ID_2L_SML | ID1 |
| 1 | FT231XS-U | Package_SO:SSOP-20_3.9x8.7mm_P0.635mm | U3 |
| 1 | GND | RD-Testpoints:TestPoint_Pad_1.0x1.0mm | TP1 |
| 1 | LM393 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | PT334-6C | LED_THT:LED_D5.0mm_Clear | Q1 |
| 1 | TSAL6100 | LED_THT:LED_D5.0mm_IRBlack | D2 |
| 1 | TVS | Diode_SMD:D_SMB | D1 |
| 1 | USB4105-GF-A | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U2 |
| 1 | VUSB | Jumper:SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mm | JP1 |
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Questions
How big is the FIC-100A PCB?
It measures 40 × 25 mm and has 2 copper layers, 1.6 mm thick.
What parts does the FIC-100A use?
40 parts, built around the FT231XS-U, LM393ADT, USBLC6-2SC6 and LTST-C170KGKT. 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 FIC-100A KiCad files?
From the Reemuson/FIC-100A repository on GitHub, at the commit this page was made from: the board is FIC-100A.kicad_pcb and its schematic Block Diagram.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the FIC-100A design in my own project?
Its repository publishes it under the CERN-OHL-W-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).