6 layers48 × 40 mm
4 layers48 × 32 mm
Cutdown
UMDBPP/TerminatorFlight termination device
- Size
- 48 × 32 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 56
- Nets
- 27
- Pads
- 188
- Tracks, vias
- 303, 166
- Pours
- 168
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 29 Jul 2023
- Updated
- 7 Sep 2026
Overview
Cutdown is an open-source printed circuit board by UMDBPP, from the UMDBPP/Terminator repository on GitHub. It is a 4-layer board of 48 × 32 mm with 56 parts on 27 nets, routed with 303 tracks and 166 vias.
It is built around the TLV172IDCK. Its parts include 15 resistors, 13 capacitors, 4 ICs, 3 connectors and 3 inductors.
Main components
1README
README.mdTerminator
A flight termination device for BPP.
T1100 - Current Revision
Much the same as T1000 but simpler and more complete.
T1000
Shipman's ENEE499L project. The digital portion integrates a STM32L4, GPS, P/T Sensor, FRAM, and SX1262 Radio. This should provide quite a bit of flexibility in a small package while consuming minimal power. The digital board interfaces with a cutdown board which performs hot-wire termination like many other designs. However, this board is really just a barebones buck converter power stage that will be controlled by the digital board. This should provide increased flexiblity and efficiency over other implementations while also allowing T1000 to terminate even 550 paracord.
Parts
56| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 10uF | Capacitor_SMD:C_1206_3216Metric | C6, C7, C8, C9, C13, C14 |
| 4 | MountingHole_Pad | Mounting_Wuerth:Mounting_Wuerth_WA-SMSI-M2_H2mm_9774020243 | H5, H6, H7, H8 |
| 3 | 10k | Resistor_SMD:R_0402_1005Metric | R5, R7, R10 |
| 3 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_DIN965_Pad | H2, H3, H4 |
| 3 | TestPoint | TestPoint:TestPoint_Keystone_5000-5004_Miniature | TP2, TP3, TP4 |
| 2 | 100m | Capacitor_SMD:C_0603_1608Metric | R1, R2 |
| 2 | 10uF | Capacitor_SMD:C_0805_2012Metric | C3, C4 |
| 2 | 15uF | Capacitor_SMD:C_1206_3216Metric | C1, C5 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric | R13, R14 |
| 2 | 3.3uH | Inductor_SMD:L_1210_3225Metric | L1, L2 |
| 2 | 30k | Resistor_SMD:R_0402_1005Metric | R12, R15 |
| 2 | 5m | Resistor_SMD:R_2512_6332Metric | R6, R11 |
| 2 | Conn_01x01_Pin | Mounting_Wuerth:Mounting_Wuerth_WA-SMSI-M2_H2mm_9774020243 | J3, J4 |
| 2 | NMOS | BPP_Lib:CSD17307Q5A | Q1, Q2 |
| 2 | TLV172IDCK | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U3, U4 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP5, TP6 |
| 1 | 1.4k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R8 |
| 1 | 1.5uH | BPP_Lib:IHLP2020CZER1R5M8A | L3 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric | C2 |
| 1 | 14k | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | 1S | Connector_AMASS:AMASS_XT30U-F_1x02_P5.0mm_Vertical | BT1 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C10 |
| 1 | 39.2k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R9 |
| 1 | 72.9k | Resistor_SMD:R_0402_1005Metric | R3 |
| 1 | 8nF | Capacitor_SMD:C_0603_1608Metric | C11 |
| 1 | Conn_01x07_Socket | BPP_Lib:Molex_ 1718570007 | J1 |
| 1 | D_Schottky_Small | Diode_SMD:D_SOD-123F | D1 |
| 1 | LOGO | BPP_Lib:scissors-art | G*** |
| 1 | LTC1751 | Package_SO:MSOP-8_3x3mm_P0.65mm | U1 |
| 1 | LTC7061IMSE-WTRPBF | Package_SO:MSOP-12-1EP_3x4mm_P0.65mm_EP1.65x2.85mm | U2 |
The 55 most common of 56 parts.
Questions
How big is the Cutdown PCB?
It measures 48 × 32 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Cutdown use?
56 parts, built around the TLV172IDCK. 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 Cutdown KiCad files?
From the UMDBPP/Terminator repository on GitHub, at the commit this page was made from: the board is Hardware/T1100/Cutdown_Power/cutdown/cutdown.kicad_pcb and its schematic Hardware/T1000/Cutdown_Power/cutdown/cutdown.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Cutdown design in my own project?
Its repository states no licence, so its author keeps all rights: ask UMDBPP before reusing the design.
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