[TechAssist] an aside note to TT- strikes again know the souce if not listed ask
- From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 14 Jun 2003 03:18:04 +0000
Here is some info about part numbers hopefull some may find it useful for
parts sourcing:
These addresses have logos for each manufacturer the second web addresses
for the manufacturers and may be helpful for identifaction
http://www.chipdocs.com/logos/logotypes.html
http://www.engineering.uiowa.edu/~eshop/mflogo.dir/ic-id.html
The following is copyed from B&D's web site about part identifaction:
How To ID A Semiconductor
By Cary Citro, CEO B&D Enterprises
--------------------------------------------------------------------------------
In the semiconductor industry today there are many different manufacturers,
logos, case styles, and part numbers. Here is a brief overview of how to
identify a part by looking at what's marked on the device.
Transistors - Most Japanese or Korean transistors will be marked with an A,
B, C, D, J, H or K prefix followed by the part number. Japanese numbers are
prefixed with a 2S, or a 3S (even though this may or may not be marked on
the part, depending on the case style) and Korean parts with a KS, or KT
(for such makers as KEC or Samsung). Just because a part says C2316 doesn't
mean it is a 2SC2316 made by Sanken. Samsung also makes a KSC2316, which is
a different device altogether. Check the case style and the logo, if any, on
the device.
Did you know? - All Japanese semiconductor part numbers are registered to a
specific manufacturer by the EIAJ? (Electronic Industry Association of
Japan) For example Toshiba makes the 2SD1555, and therefore that part number
belongs to Toshiba only. The only time you will see D1555 on a part not made
by Toshiba is when a company not registered with the EIAJ produces them,
such as some Chinese semiconductor companies.
Did you know? - The Japanese transistor numbering system is organized so
that you can tell what type of part it is just by the number? For example
all 2SA's and 2SB's are PNP types, all 2SC's and 2SD's are NPN types, and
all 2SJ, 2SK's and 3SK's are FET types with the J's being P channel, and the
K's being N channel.
Part Number Prefixes - Both the Japanese and American manufacturers use
families of prefixes that can easily identify what the manufacturer of the
device is. For example:
CTB, CTG, CTM, and CTU prefixes = Sanken diodes
CXA, CXB, and CXK prefixes = Sony Integrated circuits
DBA, DBB, DCA, DFB, DFC, and DFD prefixes = Sanyo diodes
DTA, DTB, and DTC prefixes = Rohm transistors
ERB, ERC, ERD, ESAC, ESJA, and ESJC prefixes = Fuji diodes
FMB, FMG, FML, and FMU prefixes = Sanken diodes
FT prefixes = Fujitsu Integrated circuits
HA, HB, HC, HD, HG, HM and HS prefixes = Hitachi Integrated circuits
LA, LB, LC, and LE prefixes = Sanyo Integrated circuits
SI, STR, STRD, STRM, STRS and STRZ prefixes = Sanken Integrated circuits
SLA, SMA, and STA prefixes = Sanken transistor arrays
STK prefixes = Sanyo thick film IC's
TA, TB, TC, and TD prefixes = Toshiba Integrated circuits
UPA, UPB, UPC, and UPD prefixes = NEC Integrated circuits
VPA, VPH, VPM and VPS prefixes = Sanyo video packs
There are many more families of components made by other manufacturers. Also
these prefixes are a good general rule of thumb, not an exact science. Since
so many manufacturers of semiconductors exist there will always be
exceptions to this guideline, but for 98% or so these guidelines will be
correct. Again, check your case style, know your spec, and look for logos on
the device.
OEM? Or not OEM?
I hear this statement made many times by service people that think that
buying a semiconductor from the consumer goods division parts source, or one
of their distributors, is the only way to ensure that they get an "OEM
original device".
Let me say this," Consumer product groups of certain Japanese companies have
completely different divisions that manufacture the semiconductors." They
buy their parts from the semiconductor divisions, or their distributors. The
division that makes the TV doesn't make the semiconductor. So just because
you don't buy the device from a consumer product parts depot, or one of
their distributors, doesn't mean your not getting an original device.
The correct semiconductor manufacturer makes it and it meets published
specs, or it doesn't. Don't get me wrong, some consumer product divisions do
have semiconductors specially made, tested and sorted, programmed, or
branded with internal house or schematic numbers.
Sometimes you must deal with the consumer divisions to get a custom part,
there's no way around it. But, buying a component that is a standard device
can be done anywhere as long as you get a device that is not re-branded,
pulled, or a cheap imitation. STR-S6301 is a Sanken device, period. Buying
from a consumer product division verses a non-consumer product source is
irrelevant. You either get a Sanken IC, or you do not. To say that one
source is "OEM" when another source is "generic" is redundant. The part
meets Sanken specification, or it does not. In a case like the STR-S6301
there are very little chances of getting a fake device because the IC is
difficult to produce, unlike a H.O.T., which can be readily faked. The same
can be said of the Sanyo STK series. These also would be very difficult to
fake.
It is up to you as to where you source your semiconductors, but always be
sure to use a source that will guarantee their parts to be new and
originally manufactured by the correct semiconductor makers. I hope this
information is of assistance to you and if you have further semiconductor
questions, please don't hesitate to call our engineering department at
814-757-8300.
Cary Citro, General Manager
B&D Enterprises
Main & Liberty St.
PO Box 460
Russell, PA 16345
--------------------------------------------------------------------------------
I have found B&D makes a good point.... knowing the part source. The real
question is: Is the part you are buying from the original EIA/ EIAJ register
of the number or a copy. Ask...
Peter OLiver
Tucson Radio TV
From: Paul <dntwntv@xxxxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: TT- strikes again
Date: Fri, 13 Jun 2003 17:57:53 -0700 (PDT)
Hep me understand. What is a fake part? How do you differentiate between a
"fake" and a generic? My understanding of fake has been, something that
looks real but is not. Are the "fake" parts, not real parts? Generic parts
have a generic P/N.s What do fake parts have? Paul
gulftech@xxxxxxxx wrote:Well stated, Tony.
Most of us have thousand of dollars of inventory. When I get low on a
part or find a part I don't stock, I order them. Rarely order just one,
just for high-cost items. Even if you know when and where a part is
ordered, it may be many months later when you find it defective. You may
use three of one particular part in one week and not need another of the
same for a year.
Ken Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL 32563
850-934-8324 (Voice) 850-932-0819 (Fax)
On Fri, 13 Jun 2003 17:37:35 -0500 "tony saracco"
writes:
> Yes Larry I did order generics, but I did not order fakes. Trouble
> with
> returning them is they have been in inventory for several months and
> have
> more than likely exceed the warr period. That's the trouble with
> inventory
> parts, they may not be used for some time before you find you have a
> prob
> with them. Now all my parts are tracked by when and where they came
> from.
>
> Tony Saracco
> TCS ELECTRONICS
> Elgin , IL 60120
> 847-695-1928
> tcselectronics@xxxxxxxxxxxxxxxx
> ----- Original Message -----
> From: "Larry E."
> To:
> Sent: Friday, June 13, 2003 4:55 PM
> Subject: [TechAssist] Re: TT- strikes again
>
>
> > Tony, you do realize that the "TT-STK`s" are generic right? Why
> didn`t
> you
> > just order an original Panasonic STK730-020 from Tritronics? Call
> Tritronics
> > and ask for Kevin Harris he`ll make good on the parts if their
> defective,
> Larry E
> > Larry Eastman
> > American TV & Electronics
> > Crystal River, Fl. 34428
> >
> > tony saracco wrote:
> >
> > > Well found another TT- component that is a fake. The
> TT-STK730-020 does
> not work. I used several to repair a Panasonic 32" with each failing
> after 1
> hour . The regulator would get very hot after several minuets of
> operation
> and thermally kill itself. The component looks almost identical to an
> original but the plastic casing is uniform as opposed to slight
> irregularities in the original. the fake is several grams lighter in
> weight
> than the original and you can feel the difference by holding in your
> hand.
> Another difference is the fake is more hollow sounding if tapped on
> a table
> than the original which seems more solid. After installing an
> original from
> Electronica ,the set has worked fine and the regulator is slightly
> warm to
> the touch after 10 minuets of operation. Case closed.
> > > Tony Saracco
> > > TCS ELECTRONICS
> > > Elgin , IL 60120
> > > 847-695-1928
> > > tcselectronics@xxxxxxxxxxxxxxxx
> > >
>
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Central TV&Video
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