Pico W Part Audit
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SC0918 Part Audit
Date: 2026-07-23 | Field | Current / observed value | Datasheet / official source check |
Completed the SC0918 audit and created the detailed report here: SC0918 Part Audit. I found and set the official Raspberry Pi Pico W datasheet URL, confirmed the symbol’s 53-terminal pin mapping is mostly correct, and flagged a critical footprint issue: the copper pads appear ~1000× too small/clustered while the outline is full-size.
Open items:
- Footprint needs correction before use in a real PCB.
- Pin descriptions are mostly missing, especially alternate functions and TP4/TP5 warnings.
- I filed an internal Flux part-quality report for the footprint issue.
Suggested next steps:
- Fix the SC0918 footprint pad scale and mechanical keepouts.
- Add detailed terminal descriptions/aliases from the Pico W pinout.
- Update pin types for 3V3, USB shield pads, and ADC_VREF.
- Re-run the audit after footprint edits.
Fix footprint and pins
Fix footprint scale
Add pin descriptions
Correct pin types
Verify after edits
Refine this doc
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SC0918 Part Audit
Date: 2026-07-23
Part identity and metadata
Table
| Field | Current / observed value | Datasheet / official source check |
|---|---|---|
| MPN | SC0918 | Official Raspberry Pi Pico W ordering code is SC0918 (datasheet OCR also renders it as SCO918 in one table; context confirms SC0918). |
| Manufacturer | Raspberry Pi | Matches official Raspberry Pi Pico W documentation. |
| Product | Raspberry Pi Pico W | Matches SC0918. |
| Part type | Library entry reports blank/part project context shows Evaluation Board in indexed metadata | Should be Raspberry Pi Pico W microcontroller board / module / evaluation board. |
| Description | 2.1 Manufacturer Recommendations 3.6mm Raspberry Pi | Too terse/unclear; should describe Raspberry Pi Pico W RP2040 wireless microcontroller board. |
| Terminal count | 53 | Matches: 40 main header pins + 4 USB shell pads A-D + 3 SWD/debug pads E/F/G + 6 test points TP1-TP6. |
| Datasheet URL | Set during this audit | Official URL used: https://pip-assets.raspberrypi.com/categories/686-raspberry-pi-pico-w/documents/RP-008312-DS-2-pico-w-datasheet.pdf |
| Supporting official pinout | Not a property | https://pip-assets.raspberrypi.com/categories/686-raspberry-pi-pico-w/documents/RP-008315-DS-1-PicoW-A4-Pinout.pdf |
Key datasheet specs
- Board/module: Raspberry Pi Pico W, RP2040-based microcontroller board with 2.4 GHz wireless.
- PCB body: 51 mm x 21 mm x 1 mm; micro-USB connector overhangs top edge.
- Main interface: 40 pins on 2.54 mm / 0.1 in pitch, dual castellated/through-hole style, 1 mm holes on the module.
- Exposed GPIO: 26 GPIO; GP0-GP22 digital, GP26-GP28 digital/ADC inputs.
- Logic/GPIO voltage: fixed 3.3 V.
- VBUS: nominal 5 V, 5 V +/-10%.
- VSYS: 1.8 V to 5.5 V system input.
- 3V3 output: generated by on-board SMPS; recommended external load under 300 mA.
- Operating temperature: -20 C to +70 C including self-heating.
- Mounting holes on module: 4 x 2.1 mm +/-0.05 mm drilled mounting holes.
- Antenna keepout/cutout: 14 mm x 9 mm; place antenna at board edge and avoid nearby/underlying material or metal enclosure.
Schematic symbol cross-check
Pin mapping
The 40 main terminals match the official Pico W physical pin order:
Table
| Pin range | Result |
|---|---|
| 1-20 | GP0, GP1, GND, GP2, GP3, GP4, GP5, GND, GP6, GP7, GP8, GP9, GND, GP10, GP11, GP12, GP13, GND, GP14, GP15 — matches official pinout. |
| 21-40 | GP16, GP17, GND, GP18, GP19, GP20, GP21, GND, GP22, RUN, GP26, GP27, AGND, GP28, ADC_VREF, 3V3, 3V3_EN, GND, VSYS, VBUS — matches official pinout, except the symbol names pin 36 3V3_OUT rather than official 3V3 / 3V3(OUT). |
| A-D | USB shell pads — present. |
| E/F/G | SWCLK, GND, SWDIO debug pads — present and match official debug header functions. |
| TP1-TP6 | TP1_GND, TP2_USB_DM, TP3_USB_DP, TP4_WL_GPIO1/SMPS_PS, TP5_WL_GPIO0/LED, TP6_BOOTSEL — present and match datasheet test point functions. |
Symbol/pin-description findings
- No explicit
Pin Descriptionproperties were found on the terminals; the terminal designators encode the primary names/functions, but alternate functions and warnings are not captured as descriptions. 3V3_OUTshould ideally be renamed or described as3V3/3V3(OUT)to match Raspberry Pi naming.- Pin 36
3V3_OUTis currently typedPower In; datasheet describes this as the generated 3.3 V supply output for external circuitry, soPower Out/power-source semantics would be more accurate. ADC_VREFis markedPower In; it is normally a filtered ADC reference/supply node and can be externally driven for a better reference. This is acceptable only if documented; otherwise an analog-reference/passive style would be clearer.- USB shield pads A-D are marked
Power In; a passive/shield/ground/mechanical type would better reflect function. - TP4 is typed
Not Connected, which aligns with the datasheet warning “do not use”, but the reason should be captured inPin Description. - TP5 is typed
Output, which is directionally reasonable, but the datasheet warning should be captured: it is not recommended and only swings from 0 V to the LED forward voltage. - GP26-GP28 should include ADC0/ADC1/ADC2 aliases in descriptions; GP0-GP22 could include UART/I2C/SPI/PWM alternate-function notes if this part is intended to be richly documented.
Footprint cross-check
Matches
- Footprint asset present:
MODULE_SC0918.kicad_mod. - 3D model asset present:
SC0918.step. - Symbol/thumbnail asset present:
SC0918 SC0918 Symbol.svg. - Pad count is 53, matching all expected electrical/contact pads.
- Silkscreen/outline geometry includes a Pico-sized body outline around 21 mm x 51 mm and an antenna keepout/cutout drawing around 14 mm x 9 mm.
- Main pin naming/order appears to match the official Pico W pinout.
Footprint mismatches / risks
- Critical footprint scale issue: pad coordinates and sizes reported by the layout tree are ~1000x too small compared with the silkscreen/body geometry. Example: main pad positions report around
x = +/-0.00969,y = +/-0.02413, size around0.0016, where a usable footprint should be around +/-9.69 mm, +/-24.13 mm, and ~1.6 mm-class pads. This makes the actual copper pads effectively microscopic/clustered near the origin even though the silkscreen outline is full scale. - No explicit mounting-hole nodes were found, despite the datasheet identifying four 2.1 mm +/-0.05 mm mounting holes on the Pico W. If this footprint is meant to model full mechanical mating, those should be added or intentionally documented as omitted.
- The antenna keepout appears as drawn outline/silkscreen geometry, not as an enforced copper/component keepout rule. For board reuse, it should be an actual keepout/cutout constraint.
- The datasheet recommends paste stencil zones 163% larger than the SMT footprint. Paste apertures were not visible in the inspected layout data, so paste compliance could not be verified.
- The current footprint appears to model an SMT carrier footprint, not a through-hole DIP footprint. That is acceptable only if the intended use is reflow mounting the Pico W as a module; the part description should say so.
Actions performed
- Found the official Raspberry Pi Product Information Portal datasheet for SC0918 / Raspberry Pi Pico W.
- Set the datasheet URL to the official Raspberry Pi PDF so datasheet queries now resolve for this part project.
- Filed an internal Flux part-quality report for the critical footprint pad scale mismatch and missing/unenforced mechanical features.
Recommended fixes
- Fix the footprint pad scale: convert pad coordinates/sizes to real millimetres while preserving the correct 21 mm x 51 mm outline.
- Add/verify real copper/component keepout for the 14 mm x 9 mm antenna area.
- Add or explicitly document the four 2.1 mm mounting holes.
- Add
Pin Descriptionproperties for each terminal, especially ADC aliases, power pin behavior, TP4/TP5 warnings, and SWD notes. - Adjust pin types for
3V3_OUT, USB shell pads, and possiblyADC_VREF. - Improve metadata: set a clearer description and part type such as Raspberry Pi Pico W RP2040 wireless microcontroller board / SMT module.
Part identity and metadata
Key datasheet specs
Schematic symbol cross-check
Pin mapping
Symbol/pin-description findings
Footprint cross-check
Matches
Footprint mismatches / risks
Actions performed
Recommended fixes
