SMD component codes

[John Popelish]

Does anyone have a link to a list of SMD component codes? I am trying
to identify what I think is a dual RF transistor in what looks like a
SOT-23-6 package with an S169 code etched into it.

I can find lots of codes, not in catalogs, but only by calling up
individual data sheets.

 

[Homer.Simpson]

John Popelish said

Does anyone have a link to a list of SMD component codes? I am
trying to identify what I think is a dual RF transistor in what
looks like a SOT-23-6 package with an S169 code etched into it.

I can find lots of codes, not in catalogs, but only by calling up
individual data sheets.

http://www.tkb-4u.com/code/smdcode/indexsmdcode.php

http://www.marsport.demon.co.uk/smd/mainframe.htm

http://info.electronicwerkstatt.de/bereiche/bauteile/smd/smd_aktiv/1.
html

hth

 

[John Popelish]

Homer.Simpson wrote:

John Popelish said


Does anyone have a link to a list of SMD component codes? I am
trying to identify what I think is a dual RF transistor in what
looks like a SOT-23-6 package with an S169 code etched into it.

I can find lots of codes, not in catalogs, but only by calling up
individual data sheets.



http://www.tkb-4u.com/code/smdcode/indexsmdcode.php

http://www.marsport.demon.co.uk/smd/mainframe.htm

http://info.electronicwerkstatt.de/bereiche/bauteile/smd/smd_aktiv/1.
html

I didn't find my part, but I have bookmarked these sites for future
use. Thanks.

 

[Pooh Bear]

John Popelish wrote:

Does anyone have a link to a list of SMD component codes? I am trying
to identify what I think is a dual RF transistor in what looks like a
SOT-23-6 package with an S169 code etched into it.

I can find lots of codes, not in catalogs, but only by calling up
individual data sheets.

There's precious little space to put a component code on SOT23.

I always refer to the data sheet. It's often just one letter and one
numeral. Not much help if you don't have the schematic.

Graham

 

[Boris Mohar]

I didn't find my part, but I have bookmarked these sites for future
use. Thanks.

Maybe here

http://matthieu.benoit.free.fr/cms.htm



Regards,

Boris Mohar

Got Knock? - see:
Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca

 

[John Popelish]

Boris Mohar wrote:

Maybe here

http://matthieu.benoit.free.fr/cms.htm

Another good one for the files.

But on further examination, I am beginning to think the device is
something more complicated and proprietary than a couple of
transistors. I think it is a dual antenna switch (transmit and
receive). It is connected between the antennas on a 2.4 G Hz WAN
board. I probably can't get them even if I can identify them. Sigh.

 

[Joerg]

Hello John,

But on further examination, I am beginning to think the device is
something more complicated and proprietary than a couple of
transistors. I think it is a dual antenna switch (transmit and
receive). It is connected between the antennas on a 2.4 G Hz WAN
board. I probably can't get them even if I can identify them. Sigh.

Could it be an arrangement of PIN diodes?

Regards, Joerg

http://www.analogconsultants.com

 

[Greg Neff]

On Mon, 02 May 2005 19:16:08 -0400, John Popelish <jpopelish@rica.net>
wrote:

Does anyone have a link to a list of SMD component codes? I am trying
to identify what I think is a dual RF transistor in what looks like a
SOT-23-6 package with an S169 code etched into it.

I can find lots of codes, not in catalogs, but only by calling up
individual data sheets.

Nope, no link. Two things to consider:

1) Are you sure it's S169 and not 691S?

2) The last character (or two) may be a date code.

Our inventory control system includes the part marking of each
approved component (where applicable), so that the parts that we use
can be identified and the markings can be searched. Unfortunately,
this doesn't help you.

<rant>
SMD part markings is a major pet peeve of mine. There are many cases
where the markings are not specified, even in the data sheet. This is
especially true for logic families. When I put a new part in our
database I often have to wait to get a sample to see how the part is
marked so that I can enter that data. To make matters worse I have
seen cases where the markings don't match the format specified in the
data sheet, which means that we have to chase after the manufacturer
for clarification.

While I'm ranting, it drives me nuts that some manufacturers are using
the same part numbers for both lead and lead-free finishes. They
publish dates at which the finish will change, but now we have to use
date codes to identify which parts are which. We are still trying to
figure out how to modify our inventory control system to deal with
this, to ensure that parts don't get mixed up. Like, what happens if
we need lead-free, and a disti sends us parts with an older date code?
Will the disti let us return them? And what then? What happens to
our production schedule when these old parts arrive and we suddenly
realize that we have to buy newer parts elsewhere? Didn't anyone
*think*?

And then there are things like Vishay formerly BC Components formerly
Philips resistors. At least two different part numbers for the same
thing, plus a NAFTA part number that does not appear in any data
sheet, together multiplied by the number of packaging and lead length
options. What a nightmare.
</rant>

================================

Greg Neff
VP Engineering
*Microsym* Computers Inc.
greg@guesswhichwordgoeshere.com

 

[John Popelish]

Robert Kent wrote:

Close. I expect it is a Skyworks AS169-73 SPDT switch, most likely used
to select between antennas based on signal strength.

Here's a schematic for a Prism2 WLAN card reference implementation
which uses two of these chips, one for antenna discrimination and one
for TX/RX switching:

https://gullfoss2.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=134594&native_or_pdf=pdf

I think you may be right, The layout is right and the component
values I can read match this schematic.

Credit where credit is due, here's the page where I found the above
link:

http://www.lincomatic.com/wireless/usr2410.html

Here is a datasheet for the part:

http://www.alldatasheet.com/datasheet-pdf/view/ALPHA/AS169-73.html

And what have we here, but a company offering samples and small sale
quantities of Skyworks's current RF switch product line
(disclaimer--never dealt with these guys):

https://www.cdistore.com/skyworks/switch.aspx

The AS169-73 is not listed but you might be able to substitute a part
with similar specs, such as the AS193-73.

Thank you very much. This is the info I was looking for.