From: David Humphreys (pcbman_at_ix.netcom.com)
Date: Fri Aug 08 2003 - 17:55:46 PDT
Ok. Time to reveal to true identity of D2.
It is a device called a 'TRANSORB'.
There seems to be some variation in the numbers reported to be marked
on the case but here is what I have:
KNP
76
GI
It is decoded this way:
GI is 'General Instruments'. They were part of General Semiconductors
and are now owned by Vishay Semiconductors.
KNP is the device type and this corresponds to TPSMB10.
This is a 10V TRANSORB. All it does is sit between power and ground
and waits for a voltage spike. It then conducts the excess voltage to
ground and it never reaches the inside of the Newton.
It is meant to protect the device from TRANSient voltages and absORB
them, geddit?
With a nominal input of 7.5V, it never conducts. If you connect an
unregulated supply > 9V, it starts to conduct and shorts out power and
ground but the supply, unlike a transient, doesn't go away and the
power supply fries the transorb.
The '76' is probably a date or line code.
PCBman
On Friday, August 8, 2003, at 03:30 AM, Johannes Wolf wrote:
> Do you have the data sheet?
> On my logic board I can CLEARLY read
> KNP
> 78
> and then something like a brand, looking like TI.
> But I am rather sure that this must be a zener.
>
> What do you mean with 615 mV? I could understand if it was 615 mW...
>
> Cheers
> Johannes
>
>
>> -----Original Message-----
>> From: newtontalk-bounce_at_newtontalk.net
>> [mailto:newtontalk-bounce_at_newtontalk.net]On Behalf Of Jeff Sheldon
>> Sent: Friday, August 08, 2003 2:47 AM
>> To: newtontalk_at_newtontalk.net
>> Subject: Re: [NTLK] newton 2100 power fried?
>
>
>> On Thu, Aug 07, 2003 at 07:25:13PM -0500, Jeff Sheldon wrote:
>>> It's a plane-jane SMD diode measuring at 615mW.
>
>> Or rather, 615mV. I didn't sleep well last night.
>
>
>> -Jeff
>> --
>> This is the NewtonTalk list - http://www.newtontalk.net/ for all
>> inquiries
>> List FAQ/Etiquette/Terms: http://www.newtontalk.net/faq.html
>> Official Newton FAQ: http://www.chuma.org/newton/faq/
>>
>
> --
> This is the NewtonTalk list - http://www.newtontalk.net/ for all
> inquiries
> List FAQ/Etiquette/Terms: http://www.newtontalk.net/faq.html
> Official Newton FAQ: http://www.chuma.org/newton/faq/
>
-- This is the NewtonTalk list - http://www.newtontalk.net/ for all inquiries List FAQ/Etiquette/Terms: http://www.newtontalk.net/faq.html Official Newton FAQ: http://www.chuma.org/newton/faq/
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