• Availability: VERIFIED_AVAILABLE, AVAILABLE_BUT_EXTENDED, OUT_OF_STOCK, NOT_FOUND, UNVERIFIED.
• Flux symbol: EXISTS_EXACT, SAFE_PROXY_ONLY, MISSING.
• Flux footprint: EXISTS_EXACT, GENERIC_ONLY, MISSING.
• Risk: SAFE_FOR_SCHEMATIC, BLOCKS_PCB, BLOCKS_PCBA.
• For generic passives, no exact MPN is selected because complete qualification data (including dielectric/DC-bias or pulse/current behavior where applicable) is absent. Assigning an LCSC number would be fabrication data invention.

• L1 only: Flux search found MSS1246T-683MLC, but suffix/electrical/mechanical equivalence to MSS1246T-683MLB has not been proven. It is not approved. No silent substitution.
• No alternatives are proposed for J1, U1, U10 or K1–K3 because their exact MPNs have verified LCSC listings.
• L2 cannot receive alternatives until peak/RMS switch current, allowed DCR, saturation margin, temperature rise and physical envelope are defined.

1. Verified exact LCSC targets: J1 C3197625, U1 C138714, U10 C637064 and relays C116963.
2. Exact Flux entries now found: U1, U9 and U10. They are not instantiated by this read-only phase.
3. Still blocks PCB: J1 exact JA3 library geometry, K1–K3 exact relay symbol/footprint, L1 exact MLB footprint, and L2 selection.
4. Still blocks PCBA: every generic resistor/capacitor, R9 pulse/current-sense qualification, power capacitors, and any active without a rechecked JLCPCB assembly listing at purchase time.
5. available_at_distributors or a Flux skuCount is not treated as proof of JLCPCB PCBA stock.
6. No alternative or substitution is approved. Any proposed alternative requires user approval before schematic/BOM changes.
7. Project remains BENCH_ONLY / NOT FOR FABRICATION / NOT FOR ENERGIZATION.

• No exact Flux entry was found for DX07S016JA3R1500 or LCSC C3197625; searches still return only the JA1 variant.
• Authoritative PCB source: JAE SJ122205 is the connector-only mechanical drawing and PCB land pattern for the JA3 connector. JAE SJ122206 is packaging/reel documentation and must not be used for pads, shell tabs, holes/slots, cutout, datum, orientation or PCB dimensions.
• 124019772112A (Amphenol) and USB4215-03-A (GCT) have usable Flux entries and LCSC availability, but neither is approved as mechanically interchangeable. Official drawings have not demonstrated identical connector height, shell-tab coordinates, board-edge cutout, SMT-pad coordinates and mounting-hole geometry.
• Decision: retain the approved target DX07S016JA3R1500 / C3197625; classify the JA1 entry as UNSAFE_PROXY / BLOCKS_PCB; classify the missing exact entry as J1_LIBRARY_GAP / CUSTOM_OR_IMPORTED_FOOTPRINT_REQUIRED. Do not substitute J1.

• 2.2 µH ±20%
• Isat 2.8 A minimum / 3.3 A typical at 30% inductance drop
• Irms 2.6 A minimum / 2.8 A typical at 40°C rise
• DCR 84 mΩ maximum
• 2.5 × 2.0 × 1.2 mm maximum body; recommended land A=0.70 mm, B=1.50 mm, C=2.00 mm
• Selected over Sumida 0518CDMCCDS-2R2MC because the TDK part is substantially smaller and still provides >2.5× current margin over the TPS63030 1 A switch rating. The Sumida remains a higher-current/lower-DCR alternative when efficiency or thermal margin dominates area.
• No schematic replacement performed.

• Official document mapping was clarified: JAE SJ122205 is the connector-only mechanical drawing for DX07S016JA3; SJ122206 describes the R1500 packaging/reel configuration and must not be used to create the land pattern.
• No exact JA3 Flux entry is available. Flux searches still return the JA1 variant only.
• No proposed alternate USB-C connector has demonstrated identical pads, shell-tab locations, cutout, height, orientation and datum against SJ122205.
• Creation/import must validate every pad, pin number, shell tab, hole/slot, cutout, board-edge datum, orientation and permitted PCB thickness against SJ122205, then compare the result 1:1 with the exact EasyEDA footprint for C3197625.
• Classification: UNSAFE_PROXY / J1_LIBRARY_GAP / CUSTOM_OR_IMPORTED_FOOTPRINT_REQUIRED / BLOCKS_PCB.

• TDK part data: 2.2 µH ±20%; DCR 84 mΩ max.; Isat 2.8 A minimum at 30% L drop; Itemp/Irms 2.6 A minimum at 40°C rise; −40°C to +125°C including self-heating; body 2.5 × 2.0 × 1.2 mm; land pattern 2.9 × 2.0 mm overall with 0.7 mm pads and 1.5 mm inner spacing.
• TPS63030: 2.4 MHz typical switching; 0.9–1.3 A average switch-current limit; TI requires the inductor saturation rating to be at least 20% above the calculated peak current for the actual minimum VIN, VOUT and IOUT.
• The TDK ratings provide strong apparent margin, but the project has not fixed maximum AirTag output current or minimum loaded cell voltage. Therefore the TI peak-current equation cannot be closed.
• The existing 0805 footprint is invalid for this part and must not be retained.
• Classification: PENDING_APPROVAL; no schematic change authorized until VIN(min), VOUT and IOUT(max) are fixed and the 20% Isat margin is calculated.

• 0.100 Ω, ±0.1%, 1 W, 2512, ±15 ppm/°C, −55°C to +170°C; molded alloy current-sense construction.
• Manufacturer drawing distinguishes current terminals and voltage-sampling ends, supporting a Kelvin-style PCB layout.
• Exact pulse/short-time-overload limit could not be reliably extracted, and LM5069 inrush/fault energy is not yet defined.
• Classification: PENDING_APPROVAL; requires VIN, output capacitance, inrush interval, fault timing and pulse-energy validation.

• C5 GRM21BR61E106KA73L / C84416: 10 µF ±10%, 25 V, X5R, 0805, reported available. Pending Murata DC-bias proof of ≥1 µF effective on SYS.
• C10 GRM32ER72A225KA35L / C86054: 2.2 µF ±10%, 100 V, X7R, 1210, reported available. Pending effective capacitance at actual VIN and transient margin.
• C12 GRM32ER71E226KE15L / C21397: 22 µF ±10%, 25 V, X7R, 1210, reported available. Pending effective capacitance/ripple check at RX_5V.
• C13 GCM21BR70J106KE22L / C126230: 10 µF ±10%, 6.3 V, X7R, 0805, reported available. Pending effective capacitance at maximum cell voltage.
• C14/C15 GRM21BZ70J226ME44K / C20879542: 22 µF ±20%, 6.3 V, X7R, 0805; reported out of stock and therefore not approved.
• Classification: all remain PENDING_APPROVAL; none may be applied until DC-bias curves and required effective capacitance are documented.

• AIRTAG_3V0 maximum load: 150 mA
• Minimum cell voltage: 2.5 V
• Assumed converter efficiency: 90%
• TPS63030 minimum switching frequency used: 2.2 MHz
• Calculated inductor peak current: approximately 0.243 A
• TI-required 20% saturation margin: approximately 0.292 A minimum Isat
• TDK ratings: Isat 2.8 A minimum, Irms 2.6 A minimum, DCR 84 mΩ maximum, 2.2 µH ±20%, body 2.5 × 2.0 × 1.2 mm
• Isat margin: approximately 9.6× over the calculated TI requirement

• Current schematic L2 remains generic 2.2 µH with pin 1 on AIRTAG_BUCK_L1 and pin 2 on AIRTAG_BUCK_L2.
• The old 0805 footprint is not approved for the TDK part.
• Required next action: authorize a coordinated L2 schematic replacement plus the minimum unavoidable PCB-element footprint replacement, without placement or routing changes beyond that component.

• C5 GRM21BR61E106KA73L / C84416 is APPROVED_FOR_SCHEMATIC; Murata DC-bias data indicates approximately 5.0–5.5 µF effective at 4.2 V, above the required 1 µF effective minimum.
• R9 remains PENDING_APPROVAL / BLOCKS_PCBA until LM5069 fault pulse energy and overload duration are defined.
• C10, C12, C13, C2, C4, C6, C8 and C9 remain pending because exact effective capacitance at their operating bias or regulator minimum requirement is not fully demonstrated.
• C14/C15 exact 6.3 V X7R option GRM21BZ70J226ME44K / C20879542 is out of stock. The available 10 V X7R candidate GRM21BZ71A226ME15L / C907991 remains pending DC-bias verification.
• No schematic, PCB or BOM component was changed.