what are these 8pin smd parts - serial interface

G

Grant

Guest
Hi there,

Got a blown serial interface board, and I'm trying to find what are
the two 8pin chips on one side of the PCB, pictured here:

http://grrr.id.au/image/mystery-serial-interface-chips.jpg

One chips has 452, 307 on two lines, the other has 300, 348 on two
lines.

I've read that the top number is last three digits of part number,
and the bottom number is YWW date code, it's reasonable that both
chips were made in 2003.

The SMD code site mentioned recently skips both numbers :(

Top of photo shows the nine pin serial connector, there's a couple
diodes, some resistors and a transistor on the board, other side of
board has some more components and a 5V regulator. Board is powered
from single supply with one wire for signaling, I have no further
idea how it works -> black box (some sort of motor controller) to
serial port.

TIA,
Grant.
 
On Sun, 01 Aug 2010 15:47:54 +1000, Grant <omg@grrr.id.au> wrote:

Hi there,

Got a blown serial interface board, and I'm trying to find what are
the two 8pin chips on one side of the PCB, pictured here:

http://grrr.id.au/image/mystery-serial-interface-chips.jpg

One chips has 452, 307 on two lines, the other has 300, 348 on two
lines.

I've read that the top number is last three digits of part number,
and the bottom number is YWW date code, it's reasonable that both
chips were made in 2003.

The SMD code site mentioned recently skips both numbers :(

Top of photo shows the nine pin serial connector, there's a couple
diodes, some resistors and a transistor on the board, other side of
board has some more components and a 5V regulator. Board is powered
from single supply with one wire for signaling, I have no further
idea how it works -> black box (some sort of motor controller) to
serial port.

TIA,
Grant.
Click to expand...
They look rather thick, so may be optoisolators.
 
On Sun, 01 Aug 2010 15:47:54 +1000, Grant <omg@grrr.id.au> wrote:

Hi there,

Got a blown serial interface board, and I'm trying to find what are
the two 8pin chips on one side of the PCB, pictured here:

http://grrr.id.au/image/mystery-serial-interface-chips.jpg

One chips has 452, 307 on two lines, the other has 300, 348 on two
lines.

I've read that the top number is last three digits of part number,
and the bottom number is YWW date code, it's reasonable that both
chips were made in 2003.

The SMD code site mentioned recently skips both numbers :(

Top of photo shows the nine pin serial connector, there's a couple
diodes, some resistors and a transistor on the board, other side of
board has some more components and a 5V regulator. Board is powered
from single supply with one wire for signaling, I have no further
idea how it works -> black box (some sort of motor controller) to
serial port.
Click to expand...
I'd guess an HCPL-0452 optocoupler for one. The connections seem to
match with the inputs and NC pins, and the Vcc/Gnd seem to make sense
with the 200/330 ohm voltage divider if there's a 5 V supply. Serial
input isolator and level translator?

The "300" is most likely from the same manufacturer, what with the
similar marking placement and style, but given the ubiquitous 300 thou
pitch form factor, there are a cubic butt-ton of parts ending in 300.

--
Rich Webb Norfolk, VA
 
On Sun, 01 Aug 2010 10:35:16 +0100, Mike Harrison <mike@whitewing.co.uk> wrote:

On Sun, 01 Aug 2010 15:47:54 +1000, Grant <omg@grrr.id.au> wrote:

Hi there,

Got a blown serial interface board, and I'm trying to find what are
the two 8pin chips on one side of the PCB, pictured here:

http://grrr.id.au/image/mystery-serial-interface-chips.jpg

One chips has 452, 307 on two lines, the other has 300, 348 on two
lines.

I've read that the top number is last three digits of part number,
and the bottom number is YWW date code, it's reasonable that both
chips were made in 2003.

The SMD code site mentioned recently skips both numbers :(

Top of photo shows the nine pin serial connector, there's a couple
diodes, some resistors and a transistor on the board, other side of
board has some more components and a 5V regulator. Board is powered
from single supply with one wire for signaling, I have no further
idea how it works -> black box (some sort of motor controller) to
serial port.

TIA,
Grant.

They look rather thick, so may be optoisolators.
Click to expand...
Yes, my first thought, but the traces don't follow pattern for the
8pin optos I checked. Tried dual transistor out, and dual hi-speed
with Vcc and Gnd on output (pins 5 - 8) side.

Grant.
 
On Sun, 01 Aug 2010 05:58:17 -0400, Rich Webb <bbew.ar@mapson.nozirev.ten> wrote:

On Sun, 01 Aug 2010 15:47:54 +1000, Grant <omg@grrr.id.au> wrote:

Hi there,

Got a blown serial interface board, and I'm trying to find what are
the two 8pin chips on one side of the PCB, pictured here:

http://grrr.id.au/image/mystery-serial-interface-chips.jpg

One chips has 452, 307 on two lines, the other has 300, 348 on two
lines.

I've read that the top number is last three digits of part number,
and the bottom number is YWW date code, it's reasonable that both
chips were made in 2003.

The SMD code site mentioned recently skips both numbers :(

Top of photo shows the nine pin serial connector, there's a couple
diodes, some resistors and a transistor on the board, other side of
board has some more components and a 5V regulator. Board is powered
from single supply with one wire for signaling, I have no further
idea how it works -> black box (some sort of motor controller) to
serial port.

I'd guess an HCPL-0452 optocoupler for one. The connections seem to
match with the inputs and NC pins, and the Vcc/Gnd seem to make sense
with the 200/330 ohm voltage divider if there's a 5 V supply. Serial
input isolator and level translator?
Click to expand...
Thanks! Yep, just checked the datasheet, looks very likely :)

Yes, it's a 5V supply, a blown 78L05 is on other side of PCB.
The "300" is most likely from the same manufacturer, what with the
similar marking placement and style, but given the ubiquitous 300 thou
pitch form factor, there are a cubic butt-ton of parts ending in 300.
Click to expand...
That's the problem I had, sites I searched refused to do a proper *300
search and returned all sorts of unrelated stuff. Maybe now I can narrow
down to the two manufacturers I found with a datasheet, Fairchild and
Agilent.

Thanks,
Grant.
 
On Sun, 01 Aug 2010 05:58:17 -0400, Rich Webb <bbew.ar@mapson.nozirev.ten> wrote:

On Sun, 01 Aug 2010 15:47:54 +1000, Grant <omg@grrr.id.au> wrote:

Hi there,

Got a blown serial interface board, and I'm trying to find what are
the two 8pin chips on one side of the PCB, pictured here:

http://grrr.id.au/image/mystery-serial-interface-chips.jpg

One chips has 452, 307 on two lines, the other has 300, 348 on two
lines.

I've read that the top number is last three digits of part number,
and the bottom number is YWW date code, it's reasonable that both
chips were made in 2003.

The SMD code site mentioned recently skips both numbers :(

Top of photo shows the nine pin serial connector, there's a couple
diodes, some resistors and a transistor on the board, other side of
board has some more components and a 5V regulator. Board is powered
from single supply with one wire for signaling, I have no further
idea how it works -> black box (some sort of motor controller) to
serial port.

I'd guess an HCPL-0452 optocoupler for one. The connections seem to
match with the inputs and NC pins, and the Vcc/Gnd seem to make sense
with the 200/330 ohm voltage divider if there's a 5 V supply. Serial
input isolator and level translator?

The "300" is most likely from the same manufacturer, what with the
similar marking placement and style, but given the ubiquitous 300 thou
pitch form factor, there are a cubic butt-ton of parts ending in 300.
Click to expand...
HCPL-0300 or HCPL-2300 seems likely? Low input current opto-coupler.

Another couple views:

http://grrr.id.au/image/mystery-serial-interface-chips2.jpg
http://grrr.id.au/image/mystery-serial-interface-chips3.jpg

Grant.
 
On Sun, 01 Aug 2010 20:28:47 +1000, Grant <omg@grrr.id.au> wrote:

On Sun, 01 Aug 2010 05:58:17 -0400, Rich Webb <bbew.ar@mapson.nozirev.ten> wrote:

The "300" is most likely from the same manufacturer, what with the
similar marking placement and style, but given the ubiquitous 300 thou
pitch form factor, there are a cubic butt-ton of parts ending in 300.

That's the problem I had, sites I searched refused to do a proper *300
search and returned all sorts of unrelated stuff. Maybe now I can narrow
down to the two manufacturers I found with a datasheet, Fairchild and
Agilent.
Click to expand...
Perhaps an HCPL-3000, which is motor controller interface/driver and so
it matches with the application. Hard to tell from the picture, though.
In that shot, it looks like pin 7 (which would be Gnd) is floating, so
maybe not.

--
Rich Webb Norfolk, VA
 
On Sun, 01 Aug 2010 20:51:46 +1000, Grant <omg@grrr.id.au> wrote:


HCPL-0300 or HCPL-2300 seems likely? Low input current opto-coupler.

Another couple views:

http://grrr.id.au/image/mystery-serial-interface-chips2.jpg
http://grrr.id.au/image/mystery-serial-interface-chips3.jpg
Click to expand...
Yep, that seems to match the footprint. Pin 7 on the HCPL-x300 has an
internal pull-up so leaving it NC on the board would fit.

--
Rich Webb Norfolk, VA
 
On Sun, 01 Aug 2010 07:49:42 -0400, Rich Webb <bbew.ar@mapson.nozirev.ten> wrote:

On Sun, 01 Aug 2010 20:51:46 +1000, Grant <omg@grrr.id.au> wrote:


HCPL-0300 or HCPL-2300 seems likely? Low input current opto-coupler.

Another couple views:

http://grrr.id.au/image/mystery-serial-interface-chips2.jpg
http://grrr.id.au/image/mystery-serial-interface-chips3.jpg

Yep, that seems to match the footprint. Pin 7 on the HCPL-x300 has an
internal pull-up so leaving it NC on the board would fit.
Click to expand...
Thanks for checking the footprints. Really appreciate it :)

When I repair the thing I'll add some protective components so
withstands the abuse that busted it this time.

Grant.
 
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