Need help identifying a few SMT parts

Evan Shultz · 18th June 2010, 02:23 AM

There are a couple SMT parts I can't figure out. Can you help?

Top mark, package, notes
1. 688, SOT89, NPN
2. W3, SOT23-5, from HB-PPM of Punch 45HD daughterboard
3. DK (upper) QD (lower), SOT89 (SOT23 would be BCX42), NPN
4. W25, SOT23
5. T4, SOT23-6, may be linear voltage regulator
6. 2Z, SOT23, PNP?
7. p05, SOT23

When trying to identify parts, I usually check out SMD Halbleiter Code 0... and NXP's website. Are there other good resources?

Evan Shultz · 2nd July 2010, 03:15 PM

1. Pretty sure it's Diodes, Inc. (formerly Zetex) FCX688B.
2. ROHM (and others) FMW3.
3. Used as FET gate driver in totem pole with SOT89 BCX52-10 [which has marking AG (upper) QB (lower)].

Can anyone help identify the last 5 parts?

Or suggest good SMT marking code lookup sites?

Enzo · 3rd July 2010, 03:17 AM

Do you have a bag of loose parts? Or are they in something, and if so, WHAT? Maybe we have a schematic.

I usually find it easier to look up R101 in a schematic than to try to ID on the board.

Evan Shultz · 6th July 2010, 04:43 AM

Thanks for the reply Enzo. These parts are on PCBs for which I don't have the schematic.

#3 is on the gate driver daughterboard from a Tsunami dB1100 car amp.

8. pink (cathode end) then blue band, MELF/SOD80, 400V+ diode

How does one find color band codes for MELF/SOD80 diodes? I found this and this, but they don't have this particular color band code.

18th June 2010, 02:23 AM	#1
Evan Shultz diyAudio Member Join Date: Jun 2004 Location: California, USA	Need help identifying a few SMT parts There are a couple SMT parts I can't figure out. Can you help? Top mark, package, notes 1. 688, SOT89, NPN 2. W3, SOT23-5, from HB-PPM of Punch 45HD daughterboard 3. DK (upper) QD (lower), SOT89 (SOT23 would be BCX42), NPN 4. W25, SOT23 5. T4, SOT23-6, may be linear voltage regulator 6. 2Z, SOT23, PNP? 7. p05, SOT23 When trying to identify parts, I usually check out SMD Halbleiter Code 0... and NXP's website. Are there other good resources?

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2nd July 2010, 03:15 PM	#2
Evan Shultz diyAudio Member Join Date: Jun 2004 Location: California, USA	1. Pretty sure it's Diodes, Inc. (formerly Zetex) FCX688B. 2. ROHM (and others) FMW3. 3. Used as FET gate driver in totem pole with SOT89 BCX52-10 [which has marking AG (upper) QB (lower)]. Can anyone help identify the last 5 parts? Or suggest good SMT marking code lookup sites?

3rd July 2010, 03:17 AM	#3
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Do you have a bag of loose parts? Or are they in something, and if so, WHAT? Maybe we have a schematic. I usually find it easier to look up R101 in a schematic than to try to ID on the board.

6th July 2010, 04:43 AM	#4
Evan Shultz diyAudio Member Join Date: Jun 2004 Location: California, USA	Thanks for the reply Enzo. These parts are on PCBs for which I don't have the schematic. #3 is on the gate driver daughterboard from a Tsunami dB1100 car amp. 8. pink (cathode end) then blue band, MELF/SOD80, 400V+ diode How does one find color band codes for MELF/SOD80 diodes? I found this and this, but they don't have this particular color band code.

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