Trouble identifying component

acctforjunk 20 years ago

I'm repairing a Denon DRA-375RD reciever, and have identified the faulty part. Problem is, I'm not exactly sure *what* it is. It's in a

2-lead TO-92 package, connected in series with one of the power transformer secondaries. I'm guessing it's a resettable fuse. It's electrically open, and carefully bridging it with some resistance makes the set jump to life. Seems like the circuitry wants to pull a little over 200mA through it. The component silk-screen ID is PR401, and the only markings on the package is:

N25 H

Maybe the "25" means 250mA trip? Anyone have some information? Thanks in advance.

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CATronics 20 years ago

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burbeck 20 years ago

Hi there these things are called IC protectors, sort of fuse yours is 'normal blow' 1 Amp see

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regards bob

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acctforjunk 20 years ago

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frontline 20 years ago

No reset if value is exceeded, fuse yes different faster. I am surprised to see one used at the transformer secondary they are rated at 50V designed to protect ICs but could work well for that transformer/circuit or maybe safety critical part? Jeff

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Michael A. Terrell 20 years ago

One time only, no reset. Basically, they are fuses in a plastic case that can be machine stuffed to lower assembly cost, and have the added benefit that they keep the end user from replacing the fuse.

? Michael A. Terrell Central Florida

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