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sci / sci.electronics.components / Re: BZX79 vs. BZX55

SubjectAuthor
* BZX79 vs. BZX55Jon Schneider
+- Re: BZX79 vs. BZX55Reinhard Zwirner
+* Re: BZX79 vs. BZX55John Robertson
|`- Re: BZX79 vs. BZX55Reinhard Zwirner
`* Re: BZX79 vs. BZX55legg
 `- Re: BZX79 vs. BZX55Reinhard Zwirner

1
Subject: BZX79 vs. BZX55
From: Jon Schneider
Newsgroups: sci.electronics.components
Date: Sun, 15 May 2022 09:21 UTC
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From: jon@jschneider.tenreversed (Jon Schneider)
Newsgroups: sci.electronics.components
Subject: BZX79 vs. BZX55
Date: Sun, 15 May 2022 10:21:47 +0100
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What is the difference between BZX79 and BZX55 (and other) series Zener
diodes ?

I've tried comparing datasheets but cannot find both series from the
same manufacturer.

Thanks,

Jon

Subject: Re: BZX79 vs. BZX55
From: Reinhard Zwirner
Newsgroups: sci.electronics.components
Date: Sun, 15 May 2022 16:42 UTC
References: 1
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From: reinhard.zwirner@t-online.de (Reinhard Zwirner)
Newsgroups: sci.electronics.components
Subject: Re: BZX79 vs. BZX55
Date: Sun, 15 May 2022 18:42:24 +0200
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Jon Schneider schrieb:
> What is the difference between BZX79 and BZX55 (and other) series Zener
> diodes ?

Wild guess: Just the manufacturer who wants to avoid that customers
having tested and thereafter implemented diodes out of his series
could switch without problems to same named types fom manufacturer B?

Bye

Reinhard

Subject: Re: BZX79 vs. BZX55
From: John Robertson
Newsgroups: sci.electronics.components
Date: Sun, 15 May 2022 20:07 UTC
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On 2022/05/15 2:21 a.m., Jon Schneider wrote:
> What is the difference between BZX79 and BZX55 (and other) series Zener
> diodes ?
>
> I've tried comparing datasheets but cannot find both series from the
> same manufacturer.
>
> Thanks,
>
> Jon

Possibly the case material? Some are glass, others are plastic...

My 1975 Motorola book says the BZX79 series are glass. I don't have a
reference book that covers the BZX55 series though.

John :-#)#

--
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Subject: Re: BZX79 vs. BZX55
From: Reinhard Zwirner
Newsgroups: sci.electronics.components
Date: Sun, 15 May 2022 22:08 UTC
References: 1 2
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From: reinhard.zwirner@t-online.de (Reinhard Zwirner)
Newsgroups: sci.electronics.components
Subject: Re: BZX79 vs. BZX55
Date: Mon, 16 May 2022 00:08:30 +0200
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John Robertson schrieb:
> On 2022/05/15 2:21 a.m., Jon Schneider wrote:
>> What is the difference between BZX79 and BZX55 (and other) series
>> Zener
>> diodes ?
>>
>> I've tried comparing datasheets but cannot find both series from the
>> same manufacturer.
>>
>> Thanks,
>>
>> Jon
>
> Possibly the case material? Some are glass, others are plastic...
>
> My 1975 Motorola book says the BZX79 series are glass. I don't have a
> reference book that covers the BZX55 series though.

TELEFUNKEN electronic
1985 Data Book

BZX55

CASE: JEDEC DO35

HTH

Reinhard

Subject: Re: BZX79 vs. BZX55
From: legg
Newsgroups: sci.electronics.components
Organization: A noiseless patient Spider
Date: Mon, 16 May 2022 13:36 UTC
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From: legg@nospam.magma.ca (legg)
Newsgroups: sci.electronics.components
Subject: Re: BZX79 vs. BZX55
Date: Mon, 16 May 2022 09:36:57 -0400
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On Sun, 15 May 2022 10:21:47 +0100, Jon Schneider
<jon@jschneider.tenreversed> wrote:

>What is the difference between BZX79 and BZX55 (and other) series Zener
>diodes ?
>
>I've tried comparing datasheets but cannot find both series from the
>same manufacturer.
>
>Thanks,
>
>Jon

From (1989) Philips:

BZX79 are available in tolerances of 5, 3, 2 and 1%.
They also have a lower specified leakage current, at low voltage.
( 1/2 to 1/4 of BZX55 ).

No practical difference - suspect mfr locations differed.

RL

Subject: Re: BZX79 vs. BZX55
From: Reinhard Zwirner
Newsgroups: sci.electronics.components
Date: Mon, 16 May 2022 20:36 UTC
References: 1 2
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From: reinhard.zwirner@t-online.de (Reinhard Zwirner)
Newsgroups: sci.electronics.components
Subject: Re: BZX79 vs. BZX55
Date: Mon, 16 May 2022 22:36:58 +0200
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legg schrieb:
> On Sun, 15 May 2022 10:21:47 +0100, Jon Schneider
> <jon@jschneider.tenreversed> wrote:
>
>> What is the difference between BZX79 and BZX55 (and other) series Zener
>> diodes ?
>>
>> I've tried comparing datasheets but cannot find both series from the
>> same manufacturer.
>>
>> Thanks,
>>
>> Jon
>
> From (1989) Philips:
>
> BZX79 are available in tolerances of 5, 3, 2 and 1%.

As are BZX55: - Mit engeren Toleranzen lieferbar (Available with
tighter tolerances).

> They also have a lower specified leakage current, at low voltage.
> ( 1/2 to 1/4 of BZX55 ).

I would say it is the other way round - see

<https://www.bilder-hochladen.net/files/big/12b4-144-1a15.jpg>

> No practical difference - suspect mfr locations differed.

Agreed - probably.

Bye,

Reinhard
[not in any way affiliated with one of the manufacturers ;-)]

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