2 layers114.9 × 76 mm
Protected power entry
absmach/synth
Open-source circuit compiler for engineers and AI agents
84 parts29Apache-2.0
2 layers42.8 × 50.5 mm
CatFlapV2
ifreislich/CatFlap- Size
- 42.8 × 50.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 53
- Nets
- 65
- Pads
- 215
- Tracks, vias
- 291, 63
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20230913)
- Created
- 20 Nov 2023
- Updated
- 29 Jun 2026
Overview
CatFlapV2 is an open-source printed circuit board by ifreislich, from the ifreislich/CatFlap repository on GitHub, published under the BSD-2-Clause licence. It is a 2-layer board of 42.8 × 50.5 mm with 53 parts on 65 nets, routed with 291 tracks and 63 vias.
It is built around the 74LS125DC, CP2102N-A01-GQFN28R and ESP-12E, with the MP2307DN-LF-Z, 1N4148W and AO3400 among its other parts. Its parts include 20 resistors, 13 capacitors, 7 connectors, 4 ICs and 3 diodes. It belongs with the ESP8266 boards of this library.
Main components
874LS125DC
-0℃~+70℃ 1 10ns@5.5V,50pF 15mA 18mA 24mA 4 4.5V~5.5V 74LS Power-off isolation、Output enable Tri-State Unidirectional - Buffers, Drivers, Receivers, TransceiversTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
CP2102N-A01-GQFN28R
QFN-28-EP(5x5)-40℃~+85℃ 13.7mA 195uA 3Mbps 3V~3.6V Transceiver USB 2.0 QFN-28-EP(5x5) USB Converters ROHSSilicon LabsUSB Converters
ESP-12E
SMD,24x16mm-20℃~+70℃ -90dBm 16dBm 170mA 2.4GHz 3V~3.6V 56mA 802.11b/g/n ESP8266 Chip On-board PCB Antenna Over-the-air (OTA) update UART、SPI、I2C SMD,24x16mm WiFi Modules ROHSAi-ThinkerWiFi Modules
MP2307DN-LF-Z
SOIC-8N-EP-150mil-40℃~+85℃ 1 340kHz 3A 4.75V~23V 925mV~20V Adjustable Buck Buck Built-in Yes SOIC-8N-EP-150mil DC-DC Converters ROHSMonolithic Power SystemsDC-DC Converters
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching Diodes
AO3400
SOT-23-55℃~+150℃ 1 N-channel 1.05nF 1.4V 1.5W 28mΩ@10V 30V 5.8A 77pF N-Channel SOT-23 MOSFETs ROHSGOODWORKMOSFETs
B140-E3
SMA(DO-214AC)-65℃~+150℃ 1 Independent 1A 200uA@40V 30A 40V 520mV@1A SMA(DO-214AC) Schottky Diodes ROHSVishay IntertechnologySchottky Diodes
UMH3N
SOT-363-55℃~+150℃ 0.5uA 100 100mA 150mW 2 NPN (Pre-Biased) 250MHz 300mV 50V 5V 6.11kΩ NPN SOT-363 Digital Transistors ROHSJiangsu Changjing Electronics Technology (CJ)Digital Transistors
Parts
53| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 10k | Resistor_SMD:R_0603_1608Metric | R2, R4, R8, R11, R12, R16, R18, R20 |
| 6 | 1k | Resistor_SMD:R_0603_1608Metric | R1, R3, R5, R15, R17, R19 |
| 3 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C9, C12, C13 |
| 3 | 10uF | Capacitor_SMD:C_0805_2012Metric | C1, C2, C10 |
| 2 | 1K | Resistor_SMD:R_0603_1608Metric | R13, R14 |
| 2 | 1N4148W | Diode_SMD:D_SOD-523 | D1, D3 |
| 2 | 22uF | Capacitor_SMD:C_0805_2012Metric | C7, C8 |
| 2 | AO3400 | Package_TO_SOT_SMD:SOT-23 | Q1, Q3 |
| 2 | MountingHole | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2 |
| 2 | Solenoid | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J3, J7 |
| 1 | 0.47uF | Capacitor_SMD:C_0805_2012Metric | C4 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 10nf | Capacitor_SMD:C_0805_2012Metric | C5 |
| 1 | 10uH | Inductor_SMD:L_7.3x7.3_H3.5 | L1 |
| 1 | 180k | Resistor_SMD:R_0805_2012Metric | R10 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C11 |
| 1 | 1uF | Capacitor_SMD:C_0805_2012Metric | C6 |
| 1 | 30k1 | Resistor_SMD:R_0805_2012Metric | R9 |
| 1 | 4k02 | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | 74LS125 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | 8.2nF | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | B140-E3 | Diode_SMD:D_SMA | D2 |
| 1 | Barrel_Jack_Switch | Connector_BarrelJack:BarrelJack_Horizontal | J1 |
| 1 | CP2102N-A01-GQFN28 | Package_DFN_QFN:QFN-28-1EP_5x5mm_P0.5mm_EP3.35x3.35mm | U3 |
| 1 | Door | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J5 |
| 1 | ESP-12E | RF_Module:ESP-12E | U4 |
| 1 | Egress | Connector_JST:JST_PH_B4B-PH-K_1x04_P2.00mm_Vertical | J6 |
| 1 | Ingress | Connector_JST:JST_PH_B4B-PH-K_1x04_P2.00mm_Vertical | J2 |
| 1 | MP2307DN-LF-Z | Package_SO:HSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.1mm | U2 |
| 1 | UMH3N | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q2 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Wuerth_614105150721_Vertical_CircularHoles | J4 |
Questions
How big is the CatFlapV2 PCB?
It measures 42.8 × 50.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the CatFlapV2 use?
53 parts, built around the 74LS125DC, CP2102N-A01-GQFN28R, ESP-12E and MP2307DN-LF-Z. 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 CatFlapV2 KiCad files?
From the ifreislich/CatFlap repository on GitHub, at the commit this page was made from: the board is PCB/CatFlapV2.kicad_pcb and its schematic PCB/CatFlapV2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the CatFlapV2 design in my own project?
Its repository publishes it under the BSD-2-Clause licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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