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What do isolation voltage/thickness, creepage and clearance mean?

Latest Updated:10/01/2007

Question:

What are the meanings of the terms isolation voltage, creepage distance, isolation thickness, and clearance?

Answer:

These terms are defined as follows.

- Isolation voltage
It indicates the maximum value of the AC voltage that can be applied between the input pin and the output pin, expressed as a root mean square (r.m.s) value.
The measurement conditions are normally Ta = 25°C, RH = 60%, with application of the rated AC voltage between all input-side pins and all output-side pins for 1 minute.

- Creepage distance
It indicates the minimum distance between the two conductors (input pin, output pin) along the insulating material.

 

- Isolation thickness
It indicates the minimum thickness of the insulating material between the two conductors (input, output).

 

- Clearance
It indicates the minimum distance between the two conductors (input pin, output pin) in the atmosphere.


For details about the above three terms, go to the following URL.

/products/opto/photocoupler/parameter_p/index.jsp

Suitable Products
Blue-Violet Laser
Optical Sensors
Optical Storage Devices
Fiberoptic Devices
Photocouplers / Optocouplers
Solid State Relays (OCMOS FETs)