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Identify a varistor

adrien62400

May 10, 2017
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May 10, 2017
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Hello everyone,

Could you please help me to identify a varistor on a board I have to repair ?

The mark is ZNR 7K22IU UL 48.

dfgrAk


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Thanks in advance !
 

shrtrnd

Jan 15, 2010
3,876
Joined
Jan 15, 2010
Messages
3,876
I don't have time to look it up right now, but that logo is Matsushita, which is the parent company of Panasonic.
Try Googleing that and see if you can come-up with the specs on it.
Good luck.
 

73's de Edd

Aug 21, 2015
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Aug 21, 2015
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3,613
Sir adrien62400 . . . . .

“Reading” off the parts stamped on info:

Initially there is the Matsushita family of products logo

Then the 7 relates to the ~ 7mm “slug” size of the active metal oxide element,
which directly relates to its instant power handling capacity.

Finally the 221 decodes to 22 with a final added ONE “zero” . . . .reading out as 220.
Which is the units “middle of the road” DC voltage spec of its breakdown avalanched voltage condition in which it only conducts 1 ma of current.

Digi Key referencing is used, since they carry the Bourns product which still utilizes that same numbering scheme . . . . other brands go off on a complete different tangent in their specific use of referencing.

Your part is # 15 down on this list:
http://www.bourns.com/docs/Product-Datasheets/MOV07D.pdf

Item one on this stocking list:
https://www.digikey.com/products/en/circuit-protection/tvs-varistors-movs/141?k=varistors&k=&pkeyword=varistors&pv1802=40&pv69=80&FV=fffc0076&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25

Hurrry! as they only have 1999 left . . . limit one per customer . . . . pending restocking.

Frankly I think that you are being a Don Quixote, off on a quest for the mythical hidden windmill, in your considering / suspect of this item.

If you happen to have an old tube type radio or a transformer that has a dual 120-120 VAC primary winding, I can teach you how to "fish" . . . .so that you won't be knowledge starved and will be able to evaluate units by your own testing.



73’s de Edd
 
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