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A resistor burned in the PSU

I have a problem to read the type on this component there are placed i position TH-01
Can you help me I will be very tankfull

Henrik Zeyn
Denmark
email: heyn@eltech.dk

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'TH' is a common abbreviation for 'thermistor' and they are used to dampen surge current into a supply when first turned on.

Because their purpose in life is to be variable, you will have to get information from the manufacturer if nothing is visible any more on the part.

Typical values if it is used in this manner are ~20 ohms cold and a few ohms or less once hot.

Size determines the peak power rating and they can be very small (2-3 mm) for some applications, and up to ~ 25 mm for others.

The type used in this manner is termed 'negative temperature coefficient' as its value decreases with heat.
There is, of course, also the type that increases with heat, then a 'positive temp-co.'

Depending on the state of destruction of it, you can often get a rough estimate of its range by measuring a fragment with an ohmmeter; this will tell you only if the part is a lower or higher resistance type as they are made in the kilo-ohm range too for other uses.

If I had to guess; I would use a larger one (~20-25 mm) and a cold resistance of ~ 25 ohms at 23 degrees C and a cold resistance (this is less critical) of 2 ohms or less.

Keep in mind - this part may be a victim! While they do fail alone on occasion, you may have a shorted component that forced that part to act like a fuse.

Posted on Sep 01, 2008

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