Reusing SMD-s from junk PCB-s

Due to the small size of the components, component identification by marking alone is generally difficult if not impossible due to various standards and proprietary marking systems used by manufacturers. This is further compounded by the fact that specialised active components are commonly marked with a different unique preparatory marking that the manufacturer will not tell you (as I have found out previously).

Unless you have schematic diagrams of the UPS the parts came from you are really out of luck and better to just plain buy the transistors you need from component wholesaler or distributor. This goes double for transistors that may have been damaged during the UPS failure or during disassembly (ESD or heat damage, etc) - additionally these parts, unlike passives, are almost impossible for the average person to identify using parameter simulation and matching techniques.

Oh for a simpler time when hobby electronics didn't involve microscopes and the danger of accidentally inhaling the component under inspection.

shshshhh - i totally forgot that i have a "structured database" ::

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

L:\Documents and Settings\Rene Jams>k:

K:\>cd K:\PDF-s\_chips 8x tech\SMD

K:\PDF-s\_chips 8x tech\SMD>dir /a/o/b
(&-J3Y-!)31-119.pdf
(1AM)K(-M)MBT3904-NPN.pdf
(1Ls)BC848C-NPN.pdf
(2T1)S9012-PNP.pdf
(2TY)datasheet.pdf
(2TY)S8550LT1.pdf
(5Bp)BC807-25W-PNP.pdf
(67)BFP67_RF-NPN.pdf
(BSS139)46048(N-ch-MOSFET).pdf
(E1(U))BFS17-NPN.pdf
(J3Y)S8050LT1.pdf
(M6)2SA812-PNP.pdf
index.txt
MMBT2222A.pdf <- i ordered these from local reseller (there's no case marking i can detect - but they have a spice model listed!!!)
search-wrk-001.txt

K:\PDF-s\_chips 8x tech\SMD>

(EXPIRED ??? HOW MANY COPIES YOU WANT HERE (STUPED FORUM RULES (SOME PEOPLE HAVE ALL FUN PEEING ONTO THEIR OWN LEG (WHATSOEVER))))

shshshhh - i totally forgot that i have a "structured database" ::

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

L:\Documents and Settings\Rene Jams>k:

K:\>cd K:\PDF-s\_chips 8x tech\SMD

K:\PDF-s\_chips 8x tech\SMD>dir /a/o/b
(&-J3Y-!)31-119.pdf <- WEITRON Marking S8050:J3Y
(1AM)K(-M)MBT3904-NPN.pdf <- www.kexin.com.cn Marking 1AM
(1Ls)BC848C-NPN.pdf <- SIEMENS Marking: 1Ls
(2T1)S9012-PNP.pdf <- BL Galaxy Electrical Marking: 2T1
(2TY)datasheet.pdf <- BL Galaxy Electrical S8550 = 2TY
(2TY)S8550LT1.pdf <- SHENZHEN TUOFENG DEVICE MARKING S8550LT1=2TY
(5Bp)BC807-25W-PNP.pdf <- NXP B.V. BC807-25W Marking: 5Bp
(67)BFP67_RF-NPN.pdf <- Vishay Telefunken BFP67 Marking: 67 / BFP67R Marking: 67R / BFP67W Marking: W67
(BSS139)46048(N-ch-MOSFET).pdf <- Infineon Technologies AG marking: STs
(E1(U))BFS17-NPN.pdf <- Vishay Semiconductors BFS17 Marking: E1 / BFS17R Marking: E4 / BFS17W Marking: WE1
(J3Y)S8050LT1.pdf <- SHENZHEN TUOFENG DEVICE MARKING S8050LT1=J3Y
(M6)2SA812-PNP.pdf <- BL Galaxy Electrical M4/M5/M6/M7
index.txt
MMBT2222A.pdf <- i ordered these from local reseller (PHILIPS Mark:1P) Fairchild Semiconductor Corporation Mark:1P
search-wrk-001.txt

K:\PDF-s\_chips 8x tech\SMD>