Window area, leakage inductance, copper loss and how tall the finished part sits on your board are all set before a single turn is wound. Seven geometries, each making a different trade.
EEThe default. Widest window for its size, easy to wind, cheap to tool.
EIE half plus a flat I bar. Lower cost, slightly higher stray field.
EFDFlat, low-profile section. For designs where board height is the constraint.
ETDRound centre limb. Shorter mean turn length, so lower copper loss at power.
PQRound limb in a square footprint. Best window-to-volume ratio of the set.
RMNearly closed pot. Strong self-shielding where EMI is the binding limit.
Core geometries in section · winding window shown in copper
Specification
Published figures describe the standard build. Every part is wound to order — send your exact requirement and we will confirm the specification on the quotation.
Core
EE20/5
Pins
10
Orientation
Vertical
Mounting
THT
Bobbin Material
Phenolic
Typical applications
EE, EI, EER, ETD, EFD, PQ and RM core ferrite transformers for switch-mode power supplies, converters and inverters. Wound to your turns ratio, inductance and isolation requirements.