Thank you for your post. I found no information on pinout and only on
or two instances of specifications. Only bid sheets for companies
wanting you to buy things by the thousands. Thanks again for your
post.

On Sun, 07 Jan 2007 09:37:25 GMT, "Arfa Daily"
wrote:


"zap" wrote in message
.. .
For the SK3007A series and for transistors in general, what does the
tab or colored dot indicate in terms of pinout? The collector?
Sometimes the pinout is diagramed but I don't know if they are showing
the top perspective or the bottom perspective, which would be the
opposite.
Thank you.

A tab on a package for a standard BJT, usually indicates the emitter. A
paint dot used to indicate the collector, but this is rare now. Almost all
Japanese ( 2SA, B, C, D ) BJT's in a TO92 package have pinning of E-C-B with
the device held pins down, and the flat towards you. Same goes for the much
smaller packages that they use with a chamfered rather than half rounded
back. Unfortunately, same cannot be said for U.S. ( 2N ) series devices, or
European ( BC,BF etc ), where you will nornally need to look them up. Power
devices in all varieties of flatpack such as TO220, Isowatt etc, normally
have pinning of B-C-E, with the device held pins down, and the heat
dissipating surface or metal tab, away from you. Alternatively, the writing
towards you if you prefer to think of it that way. Any exposed metal on the
device is usually common with the collector connection. TO3 "can" type power
transistors' pins are B-E, with the device held pins up, with their offset
from the centre line, away from you. The can is the collector connection.
FETs re-write the book, so I would recommend looking them up - there are
many good free datasheet sources on the net - just Google for them. Pinouts
on schematics and data sheets, where they are just a plan view of the
device, are invariably shown from the bottom looking onto the pins or
leadouts.

Arfa