Attachment Review

Thought for 3 mins 39 sec
Thought for 40 sec
Reading "SKA60 mechanical drawing pin configuration bottom view dimensions pin spacing pins 1 2 3 4 5 6 7 8" in MEAN-WELL-SKA60-DATA-SHEET-4ba0cd0a-0105-408b-a92a-39b3b91888ca.pdf.
Thought for 7 sec
Read MEAN-WELL-SKA60-DATA-SHEET-4ba0cd0a-0105-408b-a92a-39b3b91888ca.pdf.
Thought for 18 sec — Updating component footprint
Found 1 results for Mean Well SKA60 mechanical drawing pin coordinates 8 pin 2x2 DC DC converter SKA60.
Read SKA60-SPEC.PDF.
B

beedo

see the mechanical specification and pin config

2026-07-13 16_32_21-MEAN WELL SKA60 DATA SHEET.pdf - Adobe Acrobat (64-bit).png

flux

Yes — I see it: the SKA60 uses a non-uniform 8-pin bottom-view pattern, not a simple 5.08mm grid. I’ll check the current U1 footprint against those coordinates and record/fix the footprint risk.

flux

Updated U1 to match the attached SKA60 mechanical spec: the footprint now uses the non-uniform bottom-view 8-pin pattern and 1.3mm drilled / 2.2mm pads for the 1.0mm pins.
Open items:
  • The published custom part may still need the same footprint correction; I applied overrides in this project layout.
  • DRC still reports airwires because routing has not been done yet.
Documented here: PCB Layout Notes.
Fix part, route, review
Fix custom part
Route the board
Run full DRC
Explain pin pattern
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Files

Schematic

Layout

Preview

F2
F5
F4
U1
F3
J2
J5
J4
F1
J3
J1
Q1
D3
F1 P2 - Q1 D
R1 P2 - D1 2
J1 P1 - F1 P1
R2 P2 - D2 2
F1 P2 - Q1 D
J1 P1 - F1 P1
C2
Capacitance
100uF
F4 OUT - J4 P1
U1 +R.S - C2 P1
F3 OUT - J3 P1
U1 +R.S - C2 P1
U1 +R.S - C2 P1
Q1 S - D4 C
F5 OUT - J5 P1
F4 OUT - J4 P1
F2 OUT - J2 P1
F3 OUT - J3 P1
U1 +R.S - C2 P1
C1
Capacitance
1uF
R3
Resistance
100kΩ
R2
Resistance
1kΩ
Q1 S - D4 C
F4 IN - F5 IN
U1 +R.S - C2 P1
Q1 G - D4 A
R2 P2 - D2 2
Q1 S - D4 C
F2 OUT - J2 P1
Q1 S - D4 C
D2
F1 P2 - Q1 D
R1
Resistance
2.2kΩ
Q1 S - D4 C
F4 IN - F5 IN
R1 P2 - D1 2
C3
Capacitance
1uF
F5 OUT - J5 P1
D4
D1
Q1 G - D4 A
Q1 S - D4 C
Q1 G - D4 A
MH2
GND
GND
D3 A - R3 P2
U1 -R.S - C2 P2
MH4
U1 -R.S - C2 P2
U1 -R.S - C2 P2
U1 -R.S - C2 P2
D1 1 - D2 1
D1 1 - D2 1
D3 A - R3 P2
GND
U1 -R.S - C2 P2
GND
MH3
U1 -R.S - C2 P2
MH1
Schematic Design Notes
Current Schematic Status
  • Main schematic capture is complete for the requested power-distribution architecture.
  • Electrical checks currently show no open schematic ERC warnings/errors for floating pins, no-connects, pin-to-pin conflicts, power pins, single-pin nets, or undriven nets.
  • PCB DRC airwire/overlap errors are expected at this stage because no PCB placement/routing has been performed yet.
Implemented Blocks
  • J1: 24V DC input, Phoenix Contact 1803277 / MC 1,5/ 2-G-3,81, 3.81mm pitch, right-angle pluggable header.
  • F1: 5x20mm PCB fuse holder for a 4A slow-blow cartridge fuse.
  • F2: RUEF200 30V-class 2A-hold PTC for the 24V pass-through output branch.
  • J2: protected 24V output terminal block.
  • U1: Mean Well SKA60B-12 24V input to 12V/5A isolated DC-DC module.
  • F3/F4: Littelfuse 16R160B radial PTCs for 12V OUT 1 and OUT 2.
  • F5: Littelfuse 16R185B radial PTC for 12V OUT 3.
  • J3/J4/J5: protected 12V output terminal blocks.
  • C1: 1uF/50V ceramic across 24V input near U1.
  • C2: 100uF/25V electrolytic across the 12V rail near U1.
  • C3: 1uF/25V ceramic across the 12V rail near U1.
  • D1/R1: 24V green indicator LED with 2.2kΩ, 0.5W resistor.
  • D2/R2: 12V green indicator LED with 1kΩ resistor.
  • MH1-MH4: 3.2mm non-copper NPTH mounting holes for M3 screws.
Net Assignments

Table

NetFunctionCurrent Class
24V_IN_RAWJ1 positive input before fuse5A board-copper target
24V_FUSEDFused 24V bus after F1 feeding U1, F2, C1, and D1/R14A fuse-limited nominal
24V_OUTF2-protected 24V output to J22A branch
12VU1 output rail feeding C2/C3, D2/R2, and F3/F4/F55A max
12V_OUT1F3-protected 12V output to J31.6A nominal PTC hold
12V_OUT2F4-protected 12V output to J41.6A nominal PTC hold
12V_OUT3F5-protected 12V output to J51.85A nominal PTC hold
GNDCommon negative; input and output negatives intentionally tied5A return target
Datasheet-Backed Custom Parts Created
Engineering Notes and Risks
  • A 16V PTC is not suitable on the 24V pass-through branch, so the 24V branch uses a 30V-class RUEF200 instead.
  • The 16R160B and 16R185B 12V branch PTCs have room-temperature hold-current ratings. Their hold current must be derated for 60°C enclosed ambient.
  • The third 12V branch uses 16R185B because the exact Littelfuse USBR 2.0A radial 16V value was not available in the sourced USBR table. If true 2.0A continuous hold at 60°C is required, the part should be revisited.
  • The 4A slow-blow input fuse may be marginal if the SKA60B-12 is near 60W output and the 24V pass-through branch is loaded simultaneously, especially near the module's 18V minimum input where converter input current rises.
  • The SKA60B-12 output capacitance is 100uF + 1uF locally, below the stated 220uF external capacitance limit. Downstream load capacitance should also be considered.
  • No reverse-polarity protection or TVS/transient clamp has been added yet; field wiring and long 24V leads may justify adding these before layout release.
  • Common negative is intentional and defeats downstream isolation benefits of the SKA60B-12.
  • Layout must use pours/wide copper, avoid narrow neck-downs around connectors/fuse/PTCs, and keep PTCs thermally separated from U1.
  • Current DRC airwire/overlap findings are expected until placement and routing are performed.

  • Current Schematic Status

  • Implemented Blocks

  • Net Assignments

  • Datasheet-Backed Custom Parts Created

  • Engineering Notes and Risks