2 layers77.5 × 50.8 mm
2 layers77.5 × 50.8 mm
Isr
0x007E/isrShift Register Development Board
- Size
- 77.5 × 50.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 91
- Nets
- 75
- Pads
- 268
- Tracks, vias
- 303, 117
- Pours
- 12
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 27 Oct 2026
- Updated
- 5 Nov 2026
Overview
Isr is an open-source printed circuit board by 0x007E, from the 0x007E/isr repository on GitHub. It is a 2-layer board of 77.5 × 50.8 mm with 91 parts on 75 nets, routed with 303 tracks and 117 vias.
It is built around the MMBFJ113, AO3400A and BAT43, with the BUK7880-55A-VB among its other parts. Its parts include 26 resistors, 20 transistors, 14 diodes, 12 connectors and 6 capacitors.
Main components
4
MMBFJ113
SOT-23-55℃~+150℃ 1 N-channel 100Ω 350mW 500mV、3V N-Channel SOT-23 JFETs ROHSonsemiMOSFETsAO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
BAT43
DO-204AH-65℃~+125℃ 1 Independent 1V@0.2A 200mA 30V 4A 500nA@25V DO-204AH Schottky Diodes ROHSSTMicroelectronicsSchottky Diodes
BUK7880-55A-VB
SOT-223-55℃~+150℃ 1 N-channel 100pF 120pF 2.5V 22nC@10V 4.5A 60V 76mΩ@10V、85mΩ@4.5V 810pF N-Channel SOT-223 MOSFETs ROHSVBsemi ElecMOSFETs
README
README.md
ISR - Input Shift Register Development Board
The ISR is a board with an HEF4021B or any other compatible shift-register that meets the pin requirements. The board itself can be driven from 5 to 15V. The board offers the possibility to shift parallel input signals to a serial output clocked by buttons or an external signal from any other logic board.
| Experience | Level |
|---|---|
| Soldering |
Downloads
| Type | File | Description |
|---|---|---|
| Schematic | pdf / cadlab | Schematic files |
| Board | pdf / cadlab | Board file |
| Drill | Drill file | |
| BoM | xlsx / html | Bill of Material as Excel/interactive HTML |
| PCB | zip / tar | KiCAD/Gerber/BoM/Drill files |
| Mechanical | zip / tar | FreeCAD/Housing and PCB (STEP/STL) files |
Hardware
The pcb is created with KiCAD. All files are built with github actions so that they are ready for a production environment.
PCB
The circuit board is populated on both sides (Top, Bottom). The best way for soldering the SMD components is within a vapor phase soldering system and for the THT components with a standard soldering system.
Top Layer
Bottom Layer
Additional Information
| Type | Link | Description |
|---|---|---|
| HEF4021B | 8-bit static shift register |
R. GAECHTER
Parts
91| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 270 | Resistor_SMD:R_1206_3216Metric | R17, R18, R19, R20, R21, R22, R23, R24, R25, R26 |
| 10 | MMBFJ113 | Package_TO_SOT_SMD:SOT-23 | Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q18, Q20 |
| 9 | AO3400A | Package_TO_SOT_SMD:SOT-23-3 | Q10, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q19 |
| 8 | 27R | Resistor_SMD:R_1206_3216Metric | R7, R8, R9, R10, R11, R12, R13, R14 |
| 6 | Conn_02x02_Counter_Clockwise | Connector_PinSocket_2.54mm:PinSocket_2x02_P2.54mm_Vertical | J4, J5, J6, J7, J8, J9 |
| 5 | 100n | Capacitor_SMD:C_1206_3216Metric | C2, C3, C4, C5, C6 |
| 5 | 4k7 | Resistor_SMD:R_1206_3216Metric | R3, R4, R5, R6, R15 |
| 5 | Green | LED_SMD:LED_1206_3216Metric | D0, D1, D2, D3, D4 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_Pad | H1, H2, H3, H4 |
| 3 | BAT43 | Diode_SMD:D_MiniMELF | D9, D11, D12 |
| 3 | Red | LED_SMD:LED_1206_3216Metric | D7, D8, D13 |
| 2 | 10k | Resistor_SMD:R_1206_3216Metric | R2, R16 |
| 2 | Conn_01x10_Socket | Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical | J1, J3 |
| 2 | SW_SPST | Button_Switch_SMD:SW_SPST_PTS645 | SW1, SW2 |
| 2 | Yellow | LED_SMD:LED_1206_3216Metric | D5, D6 |
| 1 | 10u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C1 |
| 1 | 1k | Resistor_SMD:R_1206_3216Metric | R1 |
| 1 | 40106 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U2 |
| 1 | 4011 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | 4021 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U3 |
| 1 | BUK7880-55A | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | Q1 |
| 1 | BZ5V1 | Diode_SMD:D_MiniMELF | D10 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | Conn_01x02_Socket | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J10 |
| 1 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J11 |
| 1 | Conn_01x08_Pin | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J14 |
| 1 | ESD | Symbol:ESD-Logo_6.6x6mm_SilkScreen | FID1 |
| 1 | OH | Symbol:OSHW-Logo_5.7x6mm_SilkScreen | FID3 |
| 1 | QR | Images:QR_0x007e | FID4 |
| 1 | Waste | Symbol:WEEE-Logo_4.2x6mm_SilkScreen | FID2 |
Questions
How big is the Isr PCB?
It measures 77.5 × 50.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Isr use?
91 parts, built around the MMBFJ113, AO3400A, BAT43 and BUK7880-55A-VB. 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 Isr KiCad files?
From the 0x007E/isr repository on GitHub, at the commit this page was made from: the board is pcb/ISR.kicad_pcb and its schematic pcb/ISR.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Isr design in my own project?
Its repository states no licence, so its author keeps all rights: ask 0x007E before reusing the design.
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