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Part Audit Report
Identification
  • MPN: FA2898-ALD
  • Manufacturer: Coilcraft
  • Part type: Surface-mount flyback transformer
  • Application: 25 W Power-over-Ethernet supply using TI LM5072
  • Pin count: 12
  • Official datasheet: https://www.coilcraft.com/getmedia/0f1e71a9-8c8b-4257-9751-ce7cb42acf29/fa2677.pdf
  • Package property: Not explicitly populated; custom assets are FA2898_COC.kicad_mod and FA2898_COC.step.
  • Description property: Not explicitly populated.
The final D suffix is the packaging code for a 13-inch machine-ready reel (175 pieces). It does not change the electrical or mechanical component geometry.
Key Datasheet Specifications

Table

ParameterValue
Intended input range18–57 V
Main output5 V, 5 A
Auxiliary output11 V, 20 mA
Power25 W
Switching frequency250 kHz
Primary inductance50 µH ±10%
Minimum inductance at 2.9 A40.8 µH
Maximum primary DCR26 mΩ
Maximum secondary DCR4.0 mΩ
Maximum auxiliary DCR315 mΩ
Maximum leakage inductance1.05 µH
Primary:secondary turns ratio1:0.18
Primary:auxiliary turns ratio1:0.41
Isolation1500 Vrms primary/auxiliary to secondary
Ambient temperature−40°C to +125°C
Body envelope30.00 × 20.57 × 11.43 mm max
Terminal pitch3.0 mm
Datasheet Pin / Winding Map

Table

PinsFunction
1–4Primary winding section
2–3Primary winding section
5–6Auxiliary winding
12–7Secondary winding section
11–8Secondary winding section
10–9Secondary winding section
Required PCB paralleling for the rated application:
  • Primary: 1 + 2, and 3 + 4
  • Secondary: 10 + 11 + 12, and 7 + 8 + 9
  • Auxiliary remains on 5–6
Cross-Check Results
Metadata
  • Pass: MPN matches FA2898-ALD.
  • Pass after update: Official Coilcraft datasheet URL is now set.
  • Pass after update: Manufacturer is set to Coilcraft and Part Type to Transformer.
  • Mismatch / missing: No explicit package property.
  • Mismatch / missing: No explicit functional description property.
Schematic Symbol
  • Pass: 12 terminals are present and numbered 1–12.
  • Major mismatch: The rendered symbol is only a rectangular box with numbered pins. It contains no transformer windings, polarity dots, isolation barrier, or primary/secondary/auxiliary grouping.
  • Mismatch: Every pin name is only its number; all pin descriptions and electrical types are unspecified.
  • Risk: A schematic user cannot infer which pins form each winding or which ends must be paralleled with matching polarity. This can cause incorrect winding connections.
Recommended descriptions:

Table

PinRecommended description
1Primary winding A, undotted end
2Primary winding B, undotted end
3Primary winding B, dotted end
4Primary winding A, dotted end
5Auxiliary winding end
6Auxiliary winding end
7Secondary winding A, undotted end
8Secondary winding B, undotted end
9Secondary winding C, undotted end
10Secondary winding C, dotted end
11Secondary winding B, dotted end
12Secondary winding A, dotted end
Footprint
  • Pass: 12 pads exist, numbered 1–12.
  • Pass: Pad pitch is 3.0 mm and row arrangement/pin numbering are consistent with the mechanical drawing.
  • Likely mismatch: Existing copper pads are approximately 2.743 × 0.762 mm. The Coilcraft recommended land pattern indicates approximately 3.30 × 1.27 mm lands. Existing pads are therefore about 17% shorter and 40% narrower than the recommended lands.
  • Risk: Reduced solder fillet area and lower assembly tolerance; footprint should be corrected before production.
  • Note: The pad row center geometry appears consistent with the package drawing; the concern is pad size, not pad count or pitch.
Overall Assessment
The part identity and 12-pin numbering are correct, and the official datasheet is now attached. However, the current symbol is not a meaningful transformer symbol, terminal descriptions are absent, and the footprint pads appear undersized relative to Coilcraft’s recommended land pattern. The part should not be treated as production-ready until the symbol and footprint are corrected and re-verified against the datasheet drawing.

  • Identification

  • Key Datasheet Specifications

  • Datasheet Pin / Winding Map

  • Cross-Check Results

  • Metadata

  • Schematic Symbol

  • Footprint

  • Overall Assessment