4 layers48 × 87 mm
2 layers48 × 87 mm
Pack clips
AmbireTech/ice4Ambire Ice: secure Safe-focused hardware wallet
- Size
- 48 × 87 mm
- Copper layers
- 2
- Thickness
- 1 mm
- Parts
- 2
- Nets
- 2
- Pads
- 2
- Tracks, vias
- 0, 0
- Routed
- Not yet
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 16 Oct 2026
- Updated
- 4 Nov 2026
Overview
Pack clips is an open-source printed circuit board by AmbireTech, from the AmbireTech/ice repository on GitHub. It is a 2-layer board of 48 × 87 mm with 2 parts on 2 nets.
It is built around the MY-AAA-19-J and MY-AAA-20-J.
Main components
2README
board/experiments/README.mdPlacement experiments
Candidates for the next pass. board/wallet.kicad_pcb stays the board.
Merged (2026-10-17): the radio gate beside the airgap switch, below, is now on
the board (commit 8b8eda3). The files here are the record of how it was judged.
| File | What it is |
|---|---|
radio-gate-west.kicad_pcb | The board with the radio gate (NOR, load switch and their parts) moved next to the airgap switch, block wiring redone. Ready for hand routing like the main board. |
radio-gate-west-autorouted.kicad_pcb | That candidate, autorouted to the end. A measure of how easy it is to route, not a board to keep. |
main-autorouted.kicad_pcb | The main board autorouted the same way, for comparison. |
Result (2026-10-17)
Same autorouter run on both. It repeats itself to within about 0.1 % on the same input, so a 10 % difference comes from the placement. Blocks were pre-routed in both; no GND via beside any GND pad; pours stitched.
| Copper the autorouter had to add | Front / back | Signal vias | Detours and wiggles flagged | Left unconnected | |
|---|---|---|---|---|---|
| Main board | 1395 mm | 867 / 528 mm | 104 | 20 | 0 |
| Radio gate by the airgap switch | 1260 mm (−10 %) | 811 / 449 mm | 99 | 22 | 3 → 1 after fixes |
Why it helps: the radio gate takes AIRGAP from the switch and feeds RADIO_3V3 to the radio. In its old north-west corner, both lines ran 30–40 mm down the west side. Next to the switch, both are a few millimetres.
Open in the candidate:
- One 3.3 V link (the load switch's CT capacitor and the airgap pull-up, 2.7 mm) needs a hand trace: no via fits there.
- RADIO_OFF still comes from the MCU's south side. Moving it to a west pin was tried and made the camera escape worse, so it was not kept.
Rejected variants:
- AIRGAP_SENSE moved to a west MCU pin: more detours in the camera bus.
- The UART translator re-oriented: no legal spot in its strip at any rotation.
Rebuild or try another variant with scripts/placeVariant.py and judge it with
scripts/routeGauge.py.
Parts
2| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | MY-AAA-19-J | wallet:Battery_AAA_Clip_MYOUNG_MY-AAA-19-J | BT_N |
| 1 | MY-AAA-20-J | wallet:Battery_AAA_Clip_MYOUNG_MY-AAA-20-J | BT_P |
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Questions
How big is the Pack clips PCB?
It measures 48 × 87 mm and has 2 copper layers, 1 mm thick.
What parts does the Pack clips use?
2 parts, built around the MY-AAA-19-J and MY-AAA-20-J. 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 Pack clips KiCad files?
From the AmbireTech/ice repository on GitHub, at the commit this page was made from: the board is enclosure/pack_clips.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pack clips design in my own project?
Its repository states no licence, so its author keeps all rights: ask AmbireTech before reusing the design.