Forums

where to find a list of ID codes on recent SMT parts?

Started by Jamie December 6, 2011
  Today at my bench, my boss wanted me to look at a simple inverter
for a panel touch screen LCD monitor. While collecting information I
found that the ID codes on the smt did not match what usually go by.

  For example I had a "2A (underscore V) 3D" on a sot23 transistor.
   The chart tells me it is a 3906 (pnp) transistor however, I found
that it is actually closer to being a fet transistor.

  Then I looked a the power transistors to the primary side of the 
inverter transformer, they were NPN types however, the "DK" Id on them
point to a chart indication they are PNP and slightly incorrect package
match.

   Does a list exist that better matches these?

Jamie


On Tue, 06 Dec 2011 17:55:04 -0500, Jamie
<jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:

> > Today at my bench, my boss wanted me to look at a simple inverter >for a panel touch screen LCD monitor. While collecting information I >found that the ID codes on the smt did not match what usually go by. > > For example I had a "2A (underscore V) 3D" on a sot23 transistor. > The chart tells me it is a 3906 (pnp) transistor however, I found >that it is actually closer to being a fet transistor. > > Then I looked a the power transistors to the primary side of the >inverter transformer, they were NPN types however, the "DK" Id on them >point to a chart indication they are PNP and slightly incorrect package >match. > > Does a list exist that better matches these?
These lists are all compiled by (different) volunteers, at different times. I don't know of a current source that attempts to be up to date. A rough compilation from bipolar lists: DK BCX42 INF pnp SOT23 gp audio pnp 125V DK 2SB798-K NEC pnp SC62 SOT89 Si pnp 2W 25V 1A 110MHzT DK 2SC4672 ROH npn SC62 SOT89 Si npn 500mW 50V 3A 210MHzT DK 2SD1628 SAN npn SC62 SOT89 Si npn 500mW 20V 5A 120MHzT DK (FE) BCV47 SIE npn SOT23 Si darl 350mW 80V 500mA 200MHz DK BCX42 INF pnp SOT23 gp audio pnp 125V comp BCX41 DK SSM3J09FU TOS ? DK SSM6P09FU TOS ? 2A 2SC5026 MAT npn SC62 SOT89 VMMMA Si npn 1W 80V 1A 120MHzT 2A 2SD1304 MAT npn SC59 SOT346 LLG Si npn 200mW 17V 100mA - 2*A 2SC5712 TOS npn SC62 SOT89 Si MMMS1W 50V 3A 150>C RL Primus server issues again
On Tue, 06 Dec 2011 17:55:04 -0500, Jamie wrote:

> > Today at my bench, my boss wanted me to look at a simple inverter > for a panel touch screen LCD monitor. While collecting information I found > that the ID codes on the smt did not match what usually go by. > > For example I had a "2A (underscore V) 3D" on a sot23 transistor. > The chart tells me it is a 3906 (pnp) transistor however, I found > that it is actually closer to being a fet transistor. > > Then I looked a the power transistors to the primary side of the > inverter transformer, they were NPN types however, the "DK" Id on them > point to a chart indication they are PNP and slightly incorrect package > match. > > Does a list exist that better matches these? >
There's no exclusivity in SMD marking codes. It's not like JEDEC registered type numbers. Manufacturers are free to use whatever code suits them, irrespective to whether another manufacturer uses the same marking on a dissimilar device. Tables of markings cannot be relied upon. -- "For a successful technology, reality must take precedence over public relations, for nature cannot be fooled." (Richard Feynman)
Fred Abse wrote:
> On Tue, 06 Dec 2011 17:55:04 -0500, Jamie wrote: > > >> Today at my bench, my boss wanted me to look at a simple inverter >>for a panel touch screen LCD monitor. While collecting information I found >>that the ID codes on the smt did not match what usually go by. >> >> For example I had a "2A (underscore V) 3D" on a sot23 transistor. >> The chart tells me it is a 3906 (pnp) transistor however, I found >>that it is actually closer to being a fet transistor. >> >> Then I looked a the power transistors to the primary side of the >>inverter transformer, they were NPN types however, the "DK" Id on them >>point to a chart indication they are PNP and slightly incorrect package >>match. >> >> Does a list exist that better matches these? >> > > > There's no exclusivity in SMD marking codes. It's not like JEDEC > registered type numbers. Manufacturers are free to use whatever code suits > them, irrespective to whether another manufacturer uses the same marking on > a dissimilar device. > > Tables of markings cannot be relied upon. >
That is obvious. ;) Jamie
On Thu, 08 Dec 2011 17:29:03 -0500, Jamie
<jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:

<snip>
>> There's no exclusivity in SMD marking codes. It's not like JEDEC >> registered type numbers. Manufacturers are free to use whatever code suits >> them, irrespective to whether another manufacturer uses the same marking on >> a dissimilar device. >> >> Tables of markings cannot be relied upon. >> >That is obvious. ;) > >Jamie
They are just advisory guidelines, based on observation and mfr's publications. Sometimes they can be revealing - one two-digit code serving for a host of multidigit catalog numbers in varying body sizes....almost a wafer ident, at times. RL