Hi For fun I need to inspect the die in a typical BC847 SOT23 plastic housing How do one decap that transistor? Cheers Klaus
Decapping a SOT23
Started by ●July 9, 2020
Reply by ●July 9, 20202020-07-09
On Thursday, July 9, 2020 at 1:14:37 PM UTC-10, klaus.k...@gmail.com wrote:> Hi > > For fun I need to inspect the die in a typical BC847 SOT23 plastic housing > > How do one decap that transistor? > > Cheers > > Klausnitric acid
Reply by ●July 9, 20202020-07-09
On Thu, 9 Jul 2020 16:14:32 -0700 (PDT), klaus.kragelund@gmail.com wrote:>Hi > >For fun I need to inspect the die in a typical BC847 SOT23 plastic housing > >How do one decap that transistor? > >Cheers > >KlausSand it down? https://www.dropbox.com/s/hnu2b7qlfw98bwq/Cree_Chip.JPG?raw=1
Reply by ●July 9, 20202020-07-09
On 2020-07-09 19:52, omnilobe@gmail.com wrote:> On Thursday, July 9, 2020 at 1:14:37 PM UTC-10, klaus.k...@gmail.com wrote: >> Hi >> >> For fun I need to inspect the die in a typical BC847 SOT23 plastic housing >> >> How do one decap that transistor? >> >> Cheers >> >> Klaus > > nitric acid >They're so cheap, though...surely one has to try using a ball-peen hammer, with or without a scalpel used as a wedge? (Pro tip: wear a face shield when doing the latter!) Klaus can try 50 of them and pick the best one in less time than it takes to assemble the opinions of SED, Youtube, etc. ;) Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Reply by ●July 9, 20202020-07-09
klaus.k...@gmail.com wrote: =======================> Hi > > For fun I need to inspect the die in a typical BC847 SOT23 plastic housing >** There is no fun in trying that idea.> How do one decap that transistor?** What "cap" ? Moulded plastic encapsulation goes all over the chip. .... Phil
Reply by ●July 9, 20202020-07-09
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Phil Allison wrote:> klaus.k...@gmail.com wrote: > >======================= >> Hi >> >> For fun I need to inspect the die in a typical BC847 SOT23 plastic housing >> > > ** There is no fun in trying that idea. > >> How do one decap that transistor? > > ** What "cap" ? > > Moulded plastic encapsulation goes all over the chip."decap" as in "decapsulate". That is, break (or dissolve, etc) the shell so that you can get at the silicon wafer inside, for whatever reason. -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE3asj+xn6fYUcweBnbWVw5UznKGAFAl8Htt8ACgkQbWVw5Uzn KGC6fhAAk4d5MR3q6fSIMuSyjnOfoV6182PqzX0kbgcG8mbEMUx4FxqTPPcxvjkk /D86u3Pj3rKp8tnqfDsHjUz2SX+kJMjEjAlpH5O1fc8qOOUyfd4hWO0S+ncINLVS h9u2Sxl0uJeNtSOGLs2Ep3HCf3FSCRMu8if4H1Vbap2uEyMNxiTfmNyISCu7Mk8F ZhSfAitLRucZxLo/DeggZMh+xSL96CSonF0rJHKRqe2Rt952ChiqiWlOhUfRivwv CxiVyN8QzS6cuGozvqsmfSIG0YKaFHOy/A2qqfp8JwPpjltEWFpObX25OjZsCSoC 0rNrlX3MrmZcESKld6B7dEclXnH4I4DHW8yPLzExJiMVBR1Wgnbyt3+TiTswSccW NeS99EsNFFGYpKBqFJeYCfAEXDKeFIwUD4f12WKbdGBkJQnAgvZAUwjQ36JuwJgm JYFk1rXAx6Y+FYO2/qRrwUP77o5F4PIFA28RBl75oAlrN9KN31A6O4/qI2Sr00vP 4UHASzi/64MA9i0S+z2SeiZARWxOc/T0uJRp6uIQ5P1MBaC8462SE3BmRDbc93Yo Orzoyhz8zs9oFwoZRsE3PT+8ON6CSHStIC85l0+f0hiQYCXw29TxxgjG5ZlsOOGk twVpLfJG7nuNlV+uQAUfOwkA1uqAmPIIfdlgf8bKyH6ncqw0o/I= =Qgrp -----END PGP SIGNATURE----- -- |_|O|_| Github: https://github.com/dpurgert |_|_|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860 |O|O|O| Former PGP: 05CA 9A50 3F2E 1335 4DC5 4AEE 8E11 DDF3 1279 A281
Reply by ●July 9, 20202020-07-09
On Thu, 9 Jul 2020 20:06:12 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:>On 2020-07-09 19:52, omnilobe@gmail.com wrote: >> On Thursday, July 9, 2020 at 1:14:37 PM UTC-10, klaus.k...@gmail.com wrote: >>> Hi >>> >>> For fun I need to inspect the die in a typical BC847 SOT23 plastic housing >>> >>> How do one decap that transistor? >>> >>> Cheers >>> >>> Klaus >> >> nitric acid >> >They're so cheap, though...surely one has to try using a ball-peen >hammer, with or without a scalpel used as a wedge? (Pro tip: wear a >face shield when doing the latter!) > >Klaus can try 50 of them and pick the best one in less time than it >takes to assemble the opinions of SED, Youtube, etc. ;) > >Cheers > >Phil HobbsSqueeze it sideways in a vice. Sometimes the package will shear apart and expose the chip.
Reply by ●July 9, 20202020-07-09
On Thursday, July 9, 2020 at 2:41:30 PM UTC-10, John Larkin wrote:> On Thu, 9 Jul 2020 20:06:12 -0400, Phil Hobbs > <pcdhSpamMeSenseless@electrooptical.net> wrote: > > >On 2020-07-09 19:52, omnilobe@gmail.com wrote: > >> On Thursday, July 9, 2020 at 1:14:37 PM UTC-10, klaus.k...@gmail.com wrote: > >>> Hi > >>> > >>> For fun I need to inspect the die in a typical BC847 SOT23 plastic housing > >>> > >>> How do one decap that transistor? > >>> > >>> Cheers > >>> > >>> Klaus > >> > >> nitric acid > >> > >They're so cheap, though...surely one has to try using a ball-peen > >hammer, with or without a scalpel used as a wedge? (Pro tip: wear a > >face shield when doing the latter!) > > > >Klaus can try 50 of them and pick the best one in less time than it > >takes to assemble the opinions of SED, Youtube, etc. ;) > > > >Cheers > > > >Phil Hobbs > > Squeeze it sideways in a vice. Sometimes the package will shear apart > and expose the chip.Use a Dremel tool to take off some of the plastic. Then add nitric acid. That does not dissolve silicon dioxide. Gold is not dissolved by nitric acid. A bare chip is revealed with no corrosion.
Reply by ●July 9, 20202020-07-09
Heat it up until the package burns away. Slowly so it doesn't popcorn. Chip apart the ashes and find the die. Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Design Website: https://www.seventransistorlabs.com/ <klaus.kragelund@gmail.com> wrote in message news:f4432002-3cec-44a0-bc6d-e5160b4f53f5o@googlegroups.com...> Hi > > For fun I need to inspect the die in a typical BC847 SOT23 plastic housing > > How do one decap that transistor? > > Cheers > > Klaus
Reply by ●July 9, 20202020-07-09
On Thursday, July 9, 2020 at 9:13:00 PM UTC-4, Tim Williams wrote:> Heat it up until the package burns away. Slowly so it doesn't popcorn. > Chip apart the ashes and find the die. > > Tim > > -- > Seven Transistor Labs, LLC > Electrical Engineering Consultation and Design > Website: https://www.seventransistorlabs.com/That is pretty much guaranteed to make a horrible smell.
