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Photocoupler insulation distances (Structural parameters)
Revised May, January 2008
December, January 2007
September, March 2006
NEC photocoupler use a double structure consisting of an inner resin with high optical transmittance between the light-emitting diode (LED) and the photo-diode, and an outer resin with high light shading effect on the outside.
| No. | Name | Description |
|---|---|---|
| 1 | Outer Creepage Distance | Shortest distance between the light emitting side pin and the light receiving side pin, along the package surface (blue line in the figure above). |
| 2 | Inner Creepage Distance | Shortest distance between the light emitting side pin and the light receiving side pin, along the boundary between the inner resin and the outer resin (dark red line in the figure above). |
| 3 | Insulator Thickness | Shortest distance between the light emitting side and the light receiving side insulated with resin. |
| 4 | Clearance (Air distance) | Space outside the resin that is the shortest distance between the light emitting side pin and the light receiving side pin. Depending on the pin shape, this distance may be the same as the outer creepage distance. |
As a result, both stable operation not influenced by external light and high sensitivity (small minimum operating input current) are achieved.
Further, with this double structure, particularly for the high-insulation type, not only is a long inner creepage distance (boundary between inner resin and outer resin) achieved, but strong adhesion is also obtained due to the use of epoxy resin for both inner and outer.
As a result, an extremely high insulation voltage is achieved, since destruction by inner creeping discharge practically does not occur.
By clicking on the packages in the following table, you can see their isolation voltage and insulation distances (structural parameters).
| NO. | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Package name | 16-pin DIP |
8-pin DIP |
6-pin SDIP |
4-pin DIP |
16-pin SSOP |
12-pin SSOP |
8-pin SSOP |
5-pin long SOP |
5-pin SOP |
4-pin SOP |
4-pin SSOP |
4-pin ultra-small flat-lead |
| Top view |  |
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Under Prepa -ration |
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