Transformer Symbol Audit

A

adrian95

Review all available part information (MPN, package, pin count, description, properties). If no datasheet URL is already set, search the web for the official datasheet and update the part's Datasheet property with the URL. Then cross-check the schematic symbol, footprint, and pin descriptions against the datasheet. Summarize key specs and flag any mismatches.

flux

I’ll audit the part metadata, source the official datasheet if needed, update the Datasheet property, then verify the symbol, footprint, and pin descriptions against it.

flux

The audit found a serious symbol issue: pin 2 is shown as a primary connection but is unused in the official winding diagram. I’m doing a final read-back of the stored metadata and pin mapping before closing the review.

flux

Audit complete for Würth Elektronik Midcom 750811611, an EFD20 SMT, 12-pad WE‑OLEFD transformer. The existing Datasheet property was already populated, so it was not changed; the official datasheet is https://www.we-online.com/components/products/datasheet/750811611.pdf.
  • Key specs: 800 µH ±10% primary, 68–100 kHz, dual 5 V/2 A outputs, 1.4 A typical saturation current, 27 µH max leakage, 4500 VAC primary-to-secondary isolation, −40°C to +125°C.
  • Critical mismatch: pin 2 is NC in the official winding diagram but is labeled PRI_2 in the symbol. Actual windings are primary 1–3, auxiliary 4–6 and 4–5, and secondaries 7–10 and 8–11; pins 2, 9, and 12 are unused.
  • Pin descriptions, electrical types, winding graphics, and polarity dots are missing. The footprint’s 12 pads, 3 mm pitch, and overall dimensions appear plausible, but its asset is incorrectly named 7508116312, lacks an explicit courtyard, and the 3D alignment was not fully verifiable.
  • The project description’s 5 V/1.75 A outputs differ from the datasheet’s typical 5 V/2 A rating.
Disposition: not safe to use as-is until the symbol pin mapping, winding relationships, and polarity are corrected.
Fix and verify part
Correct symbol pins
Add pin metadata
Verify polarity dots
Check footprint details
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Files

Pins

Symbol

Layout

3D View

Name
Pin #
Type
Part Type
Terminal Order
PRI_1
1
Unspecified
Terminal
PRI_2
2
Unspecified
Terminal
PRI_3
3
Unspecified
Terminal
AUX_1
4
Unspecified
Terminal
AUX_2
5
Unspecified
Terminal
AUX_3
6
Unspecified
Terminal
SEC_1
7
Unspecified
Terminal
SEC_2
8
Unspecified
Terminal
NC_1
9
Unspecified
Terminal
SEC_3
10
Unspecified
Terminal
SEC_4
11
Unspecified
Terminal
NC_2
12
Unspecified
Terminal

750811611