JHCOILS lists transformer bobbin references for EE, PQ, POT, EFD and ETD core families. Select by the dimensioned drawing, winding window and terminal layout; the family name alone is not enough to confirm fit.
Check the core opening, usable winding width, flange dimensions, overall height, pin pitch and pin numbering. Show the PCB footprint and lead exits so the bobbin can be reviewed in the assembled transformer rather than as an isolated plastic part.
Bobbin drawings may specify thermoplastics such as PA/nylon, PET or PBT, or a thermoset such as phenolic. Confirm the exact resin grade, reinforcement, temperature data and molding specification for the selected part.
A material family name does not establish a flame rating or an insulation-system approval. Request the relevant grade document, rated thickness and applicable test evidence when these are purchasing requirements. Also specify horizontal or vertical mounting, number of winding chambers and pin arrangement.
EE Series Transformer Bobbins
For an EE bobbin, check the center-leg opening, flange spacing and pin layout against the selected core set and PCB. Use the chart as a starting point and request the current drawing for the chosen size.
| Products | Datasheet | Product Code | Description | Ask for sample |
|---|---|---|---|---|
 |  Check it | EE01 | E12.5 Vertical 5+5 Transformer BOBBIN | Contact Us |
 Enlarge | Check it | EE02 | E105.55 Horizontal 4+4 Ferrite BOBBIN | Contact Us |
 Enlarge | Check it | EE03 | E13610 Vertical 5+5 BOBBIN | Contact Us |
 Enlarge | Check it | EE04 | E25106 Vertical 3+3 BOBBIN | Contact Us |
 Enlarge | Check it | EE05 | E331413 Vertical 17+17 BOBBIN | Contact Us |
 | Check it | EE06 | E331413 Vertical 18+18 Transformer BOBBIN | Contact Us |
PQ Series Transformer Bobbins
For a PQ assembly, compare the core opening and winding window as well as the terminal footprint. Confirm that the bobbin and core share the same dimensional reference.
| Products | Datasheet | Product Code | Description | Ask for sample |
|---|---|---|---|---|
 | Check it | PQ01 | PQ2016 Vertical 6+8 transformer bobbin | Contact Us |
 | Check it | PQ02 | PQ2020 Vertical 6+8 transformer bobbin | Contact Us |
 | Check it | PQ03 | PQ3220 Vertical 6+6 transformer bobbin | Contact Us |
 | Check it | PQ04 | PQ3225 Vertical 6+6 transformer bobbin | Contact Us |
 | Check it | PQ05 | PQ3535 Vertical 6+6 transformer bobbin | Contact Us |
 | Check it | PQ06 | PQ4040 Vertical 6+6 transformer bobbin | Contact Us |
 | Check it | PQ07 | PQ5050 Vertical 6+6 transformer bobbin | Contact Us |
POT Series Transformer Bobbins
For a POT core, verify the bobbin fits inside the complete core set and that the lead exits clear the core and mounting hardware. Specify the winding chambers and pin orientation.
| Products | Datasheet | Product Code | Description | Ask for sample |
|---|---|---|---|---|
 | Check it | POT01 | POT40 Vertical 6+6 BOBBIN | Contact Us |
 | Check it | POT02 | POT3019 Vertical 5+5 BOBBIN | Contact Us |
 | Check it | POT03 | POT3314 Vertical 5+5 BOBBIN | Contact Us |
EFD Series Transformer Bobbins
For an EFD bobbin, check assembled height, insulation distances, winding build and pin accessibility. Resin grade, flame rating and dielectric test requirements must be confirmed for the exact part; the chart does not establish a universal voltage rating.
| Products | Datasheet | Product Code | Description | Ask for sample |
|---|---|---|---|---|
 | Check it | EFD01 | EFD157.54.6 Horizontal 4+5 BOBBIN | Contact Us |
 | Check it | EFDT02 | EFD2512.59 Horizontal 5+5 BOBBIN | Contact Us |
 | Check it | EFD03 | EFD20106.6 Horizontal 5+5 BOBBIN | Contact Us |
 | Check it | EFD04 | EFD25259 Horizontal 5+5 BOBBIN | |
 | Check it | EFD05 | EFD30159 Horizontal 6+6 BOBBIN |
ETD Series Transformer Bobbins
For an ETD bobbin, provide winding build, terminal current requirements, mounting layout and insulation boundaries. Suitability for an industrial, automotive or power-conversion product requires review of the complete transformer specification.
| Products | Datasheet | Product Code | Description | Ask for sample |
|---|---|---|---|---|
 | Check it | ETD01 | ETD291510 Vertical 7+7 BOBBIN | Contact Us |
 | Check it | ETD02 | ETD341711 Horizontal 7+7 BOBBIN | Contact Us |
 | Check it | ETD03 | ETD492516 Horizontal 10+10 BOBBIN | Contact Us |
 | Check it | ETD04 | ETD542719 Horizontal 11+11 BOBBIN | Contact Us |
 | Check it | ETD05 | ETD593122 Horizontal 12+12 BOBBIN | Contact Us |
 | Check it | ETD06 | ETD593122 Horizontal 13+13 PET BOBBIN | Contact Us |
Insulation and Winding Requirements
Mark the primary and secondary winding positions, barriers, margins, creepage and clearance requirements on the drawing. State the insulation system and test procedure expected for the finished transformer. Bobbin geometry and resin documentation are inputs to that review, not a substitute for assembly validation.
Send the bobbin code, dimensioned drawing, matching ferrite core reference and pin schedule. If the scope includes winding and lead preparation, review bobbin-wound coil manufacturing and specify the acceptance requirements for the finished component.
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