2 layers47.5 × 27 mm
2 layers70 × 120.3 mm
Micro
ray33ee/DCT- Size
- 70 × 120.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 187
- Nets
- 203
- Pads
- 582
- Tracks, vias
- 1,029, 625
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 22 Nov 2024
- Updated
- 21 Jul 2025
Overview
Micro is an open-source printed circuit board by ray33ee, from the ray33ee/DCT repository on GitHub. It is a 2-layer board of 70 × 120.3 mm with 187 parts on 203 nets, routed with 1,029 tracks and 625 vias.
It is built around the PMBT2222A, BSS138 and S9012, with the CJ2301 among its other parts. Its parts include 109 resistors, 68 transistors, 5 capacitors, 3 ICs and 1 connector.
Main components
4
PMBT2222A
SOT-231 NPN 10nA 1V 200mW 300 300MHz 40V 600mA 6V NPN SOT-23 Bipolar (BJT) ROHSPAKERBipolar (BJT)BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETsS9012
SOT-23-55℃~+150℃ 1 PNP 100nA 25V 300MHz 300mW 400 500mA 5V 600mV PNP SOT-23 Bipolar (BJT) ROHSFOSANBipolar (BJT)CJ2301
SOT-23-55℃~+150℃ 1 P-Channel 142mΩ@2.5V 1V 2.3A 20V 400mW 405pF 55pF 75pF P-Channel SOT-23 MOSFETs ROHSJiangsu Changjing Electronics Technology (CJ)MOSFETs
Parts
187| Qty | Value | Footprint | References |
|---|---|---|---|
| 48 | 2.7k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R3, R17, R21, R22, R23, R27, R28, R29, R33, R34, R35, R39, R100, R101, R105, R106 +32 |
| 32 | 10k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R4, R5, R18, R19, R24, R25, R30, R31, R36, R37, R42, R43, R48, R49, R102, R103 +16 |
| 32 | PMBT2222A | Package_TO_SOT_SMD:SOT-23_Handsoldering | Q1, Q10, Q11, Q14, Q15, Q18, Q19, Q22, Q23, Q26, Q27, Q30, Q31, Q34, Q35, Q38 +16 |
| 16 | 5.6k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R6, R20, R26, R32, R38, R44, R50, R56, R62, R68, R74, R80, R86, R92, R98, R104 |
| 16 | BSS138 | Package_TO_SOT_SMD:SOT-23_Handsoldering | Q2, Q8, Q12, Q16, Q20, Q24, Q28, Q32, Q36, Q40, Q44, Q48, Q52, Q56, Q60, Q64 |
| 16 | S9012 | Package_TO_SOT_SMD:SOT-23_Handsoldering | Q3, Q9, Q13, Q17, Q21, Q25, Q29, Q33, Q37, Q41, Q45, Q49, Q53, Q57, Q61, Q65 |
| 3 | 0.1µF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1, C4, C5 |
| 3 | 1K | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R11 |
| 2 | 2k2 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R9, R109 |
| 2 | CJ2301 | Package_TO_SOT_SMD:SOT-23 | Q6, Q67 |
| 2 | MCP23017_SO | Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm | U2, U3 |
| 2 | PMBT2222A | Package_TO_SOT_SMD:SOT-23 | Q5, Q68 |
| 2 | R | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R107, R108 |
| 1 | 1 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R14 |
| 1 | 100µF | Capacitor_SMD:CP_Elec_6.3x7.7 | C2 |
| 1 | 150µH | Inductor_THT:L_Axial_L11.0mm_D4.5mm_P15.24mm_Horizontal_Fastron_MECC | L1 |
| 1 | 16-pin ZIF Socket | Library:ZIF-16 | J1 |
| 1 | 18k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R12 |
| 1 | 22µF | Capacitor_SMD:CP_Elec_6.3x5.4 | C3 |
| 1 | 33k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R13 |
| 1 | 36k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R15 |
| 1 | 68k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R16 |
| 1 | 820 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R10 |
| 1 | NUCLEO-G474RE | Library:G474 | U1 |
Questions
How big is the Micro PCB?
It measures 70 × 120.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Micro use?
187 parts, built around the PMBT2222A, BSS138, S9012 and CJ2301. 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 Micro KiCad files?
From the ray33ee/DCT repository on GitHub, at the commit this page was made from: the board is schematics/micro/micro.kicad_pcb and its schematic schematics/PSU/PSU.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Micro design in my own project?
Its repository states no licence, so its author keeps all rights: ask ray33ee before reusing the design.
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