Supercapacitor Part Review
Worked for 8 mins 55 sec
Created a project doc
BCAP0360 P270 S18 Part Review
Date: 2026-07-21 Official datasheet found and set on the part project:
Set the Datasheet URL to the official Maxwell PDF and completed the part review in BCAP0360 P270 S18 Part Review.
Key flags: metadata is broadly correct, but the symbol is under-specified—no polarity, no pin descriptions, and all four terminals are
Unspecified; the two blank mechanical terminals must be clearly isolated/NC per datasheet. The footprint body diameter looks plausible, but pad polarity mapping and drill/hole geometry need verification before publishing or ordering.
Fix the symbol so it clearly labels positive, negative, and the two isolated mechanical terminals.
Thought for 7 sec
I’ll update the four terminal definitions so the symbol explicitly shows +, −, and two isolated mechanical/NC support terminals, then verify the properties.
Worked for 2 mins 2 sec
Updated and verified the symbol terminal properties:
- Pin 1:
Positive terminal (+), Passive - Pin 3:
Negative terminal (-), Passive - Pins 2 and 4:
Isolated mechanical support terminal - do not connect, Not Connected
Open item: the footprint pad-to-datasheet mechanical mapping and drill size still need separate verification if you want this part fully publish-ready.
Fix footprint and review
Verify pad mapping
Adjust drill geometry
Run component review
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BCAP0360 P270 S18 Part Review
Date: 2026-07-21
Datasheet
Official datasheet found and set on the part project:
- URL: https://maxwell.com/wp-content/uploads/2021/08/2.7V-360F_ds_3001963-EN.6_20200908.pdf
- Document: Maxwell
3001963-EN.6, 2.7 V 360 F Ultracapacitor Cell
Current Flux Part Metadata
Table
| Field | Current value | Review |
|---|---|---|
| Project / part name | BCAP0360 P270 S18 | Matches datasheet model. |
| Manufacturer Part Number | BCAP0360 P270 S18 | Matches datasheet Maxwell model number. |
| Manufacturer | Maxwell Technologies | Matches datasheet publisher. |
| Part Type | Super-cap Capacitor | Appropriate for EDLC / ultracapacitor. |
| Designator Prefix | C | Appropriate for capacitor. |
| Datasheet URL | Official Maxwell PDF | Added during this review. |
| Package / footprint name | BCAP0360_35X35_NCP | Plausible for 35 mm snap-in can, but pad mapping needs verification. |
| Pin count | 4 | Matches observed footprint/pin-count concept: 2 electrical terminals plus 2 blank mechanical terminals. |
Datasheet Key Specs
Table
| Parameter | Datasheet value |
|---|---|
| Rated voltage | 2.7 VDC |
| Surge voltage | 2.85 VDC, non-repetitive, max 1 s |
| Rated capacitance | 360 F |
| Initial capacitance range | 360 F to 432 F |
| Typical initial capacitance | 375 F |
| Rated max initial DC ESR | 3.2 mΩ |
| Typical initial DC ESR | 2.9 mΩ |
| Maximum leakage current | 0.75 mA after 72 h at rated voltage and 25 °C |
| Maximum non-repetitive peak current | 220 A |
| Usable continuous current, BOL, ΔT = 15 °C | 23 A |
| Usable continuous current, BOL, ΔT = 40 °C | 38 A |
| Operating temperature at 2.7 V | -40 °C to +65 °C |
| Extended operation derated to 2.3 V | -40 °C to +85 °C |
| Projected DC life at 25 °C, rated voltage | 10 years |
| Cycle life at 25 °C | 500,000 cycles |
| Shelf life | 4 years, uncharged at 25 °C, ≤50% RH |
| Certifications / compliance | UL 810A, RoHS, REACH |
| Nominal mass | 71.4 g |
Mechanical / Footprint Specs from Datasheet
Table
| Parameter | Datasheet value |
|---|---|
| Length / height, L | 63.0 mm ±1.0 |
| Diameter, D | 35.0 mm +1.0 |
| Terminal thickness, t | 1.5 mm ±0.1 |
| H | 5.6 mm ±1.0 |
| A | 22.5 mm ±0.1 |
| B | 19.5 mm ±0.1 |
| C | 5.6 mm ±0.1 |
Important datasheet warning:
The blank terminals are provided for mechanical support only. The corresponding PCB patterns must be isolated from positive and negative terminals. Failure to isolate the blank terminals may result in malfunction of the product.
Current Symbol Review
The current schematic symbol is represented by four Terminal components numbered 1 through 4:
Table
| Pin | Current properties | Review |
|---|---|---|
| 1 | Pin Number 1, Pin Type Unspecified | Missing polarity / function. |
| 2 | Pin Number 2, Pin Type Unspecified | Missing polarity / function. |
| 3 | Pin Number 3, Pin Type Unspecified | Missing polarity / function. |
| 4 | Pin Number 4, Pin Type Unspecified | Missing polarity / function. |
Symbol mismatches / risks
- Polarity is not represented. This is a polarized ultracapacitor, but the schematic symbol has no
+/-terminal descriptions. - Blank mechanical terminals are not identified. The datasheet explicitly requires blank terminals to be isolated from positive and negative terminals, but the symbol presents all four terminals as unspecified electrical pins.
- Pin Type is
Unspecifiedon all pins. Electrical terminals should be intentionally typed, and blank support terminals should be clearly marked as NC/mechanical/isolate where supported. - Pin descriptions are missing. The part should identify one positive terminal, one negative terminal, and two blank mechanical support terminals.
Current Footprint Review
Imported footprint:
BCAP0360_35X35_NCP.kicad_mod, through-hole.Observed KiCad pad geometry:
Table
| Pad | Shape | Center (mm) | Pad size | Drill |
|---|---|---|---|---|
| 1 | Rect | (0, 0) | 2.0574 mm × 2.0574 mm | 1.5494 mm |
| 2 | Circle | (-8.443748, -4.875) | 2.0574 mm × 2.0574 mm | 1.5494 mm |
| 3 | Circle | (-16.887496, 0) | 2.0574 mm × 2.0574 mm | 1.5494 mm |
| 4 | Circle | (-8.443748, 14.625001) | 2.0574 mm × 2.0574 mm | 1.5494 mm |
Observed outline/marking:
- Fab circle radius: 17.5 mm, matching 35 mm nominal can diameter.
- Silk circle radius: 17.63 mm, slightly outside the nominal body.
- Plus marker appears near pad 1.
- Courtyard is octagonal and surrounds the 35 mm can outline.
Footprint items that look consistent
- Body diameter: 35 mm diameter is represented by the 17.5 mm fab circle.
- Package type: Through-hole snap-in style is consistent with datasheet/distributor information.
- One spacing match: Pad 2 to pad 4 vertical spacing is 19.500001 mm, matching datasheet dimension B = 19.5 mm.
- Polarity marker present: The footprint includes a plus marker near pad 1.
Footprint mismatches / risks
- Electrical meaning of pads is not reviewable from the symbol. The footprint suggests pad 1 may be positive due to the nearby plus marker, but the schematic pin 1 has no description or polarity.
- Blank pads are ordinary through-hole pads. This is only acceptable if the corresponding schematic pins are clearly NC/mechanical and remain isolated. Current symbol does not make that clear.
- Drill size appears tight. Drill = 1.5494 mm versus datasheet terminal thickness t = 1.5 mm ±0.1. At max terminal thickness, 1.6 mm, this hole would be undersized. The datasheet extract did not provide an explicit recommended PCB finished-hole or slot size, so this should be verified before publishing/ordering.
- Dimension A = 22.5 mm is not obvious from observed pad centers. Body diameter and B = 19.5 mm are represented, but the mapping of A/B/C to the full 4-pad layout should be checked against the mechanical drawing image.
- Terminal shape may need confirmation. Datasheet gives tab thickness
t, which can imply flat snap-in terminals; round drilled holes may or may not be sufficient depending on the actual terminal geometry and recommended land pattern.
Component Review Checks
Flux component review checks were queried and no component-review check results were returned at the time of review.
Verdict
The part metadata and datasheet association are now correct, and the body outline of the footprint appears plausible for a 35 mm snap-in ultracapacitor. However, the part should be considered not fully review-clean until the symbol and footprint terminal semantics are fixed/verified.
Recommended Fixes
- Update the schematic symbol so pins are explicitly described as:
- Positive terminal
- Negative terminal
- Blank mechanical support terminal — isolate / NC
- Blank mechanical support terminal — isolate / NC
- Confirm the Maxwell mechanical drawing’s pin numbering and ensure footprint pad numbers map correctly to positive, negative, and blank terminals.
- Mark blank support terminals as NC/mechanical/isolate in the part data where supported.
- Verify or adjust drill/hole/slot geometry for 1.5 mm ±0.1 snap-in terminals; the current 1.5494 mm drill appears marginal.
- Re-run/review component checks after symbol terminal descriptions and footprint pad semantics are corrected.
Datasheet
Current Flux Part Metadata
Datasheet Key Specs
Mechanical / Footprint Specs from Datasheet
Current Symbol Review
Symbol mismatches / risks
Current Footprint Review
Footprint items that look consistent
Footprint mismatches / risks
Component Review Checks
Verdict
Recommended Fixes
