Author Topic: Transistors - die pictures  (Read 31862 times)

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Offline magic

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Re: Transistors - die pictures
« Reply #375 on: April 10, 2021, 06:22:38 am »
 

Offline Noopy

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Re: Transistors - die pictures
« Reply #376 on: April 10, 2021, 06:41:39 am »
patience
aka focus stacking :P

Yes:






37 pictures / 1GB for this one...

 :-/O 8)
 
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Offline SilverSolder

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Re: Transistors - die pictures
« Reply #377 on: April 10, 2021, 12:23:35 pm »

Are you using Photoshop for the focus stacking?
 

Offline Noopy

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Re: Transistors - die pictures
« Reply #378 on: April 10, 2021, 01:45:51 pm »
I use Photoshop but for focus stacking I use Helicon Focus: https://www.heliconsoft.com/heliconsoft-products/helicon-focus/
Works fine.  :-+
« Last Edit: April 10, 2021, 01:47:40 pm by Noopy »
 
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Offline Noopy

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Re: Transistors - die pictures
« Reply #379 on: April 15, 2021, 06:20:43 pm »


The Motorola ENI-1B seems to be a special transistor for the RF amp manufacturer ENI. It was found in a plasma generator but I can´t tell you more.  :-//
Perhaps Motorola did some binning. Perhaps they just gave it a new name.  :-//






A nice big transistor with a big heatspreader and a big die.




And a nice bondwire!  :-+ 8)




It´s a MESA-transistor.




There are more structures between base and emitter than you would expect.
We have similar structures in the conterfeit BUX22 (https://www.richis-lab.de/Bipolar09.htm), in the conterfeit BUX66 (https://www.richis-lab.de/Bipolar42.htm) and in the 3DD15D (https://www.richis-lab.de/Bipolar05.htm). I still don´t know why they integrated these structures.  :-//




Base emitter breakdown occurs at -11V and is quite uniform.
20mA




50mA




100mA




200mA




500mA


https://www.richis-lab.de/Bipolar51.htm

 :-/O
 
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Offline Noopy

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Re: Transistors - die pictures
« Reply #380 on: April 21, 2021, 12:07:25 pm »
I have added two transistors built by CDIL (Continental Device India Ltd.):




CDIL BC550C






With an edge length of 0,31mm the CDIL BC550C is a little bigger than the Philips BC550C (0,26mm x 0,27mm).




Yes, it´s a small transistor.  ;D


https://www.richis-lab.de/Bipolar39.htm






CDIL BC560C






Although pnp transistors have often worse specifications than npn transistors the CDIL BC560C has the same edge length as the CDIL BC550C.




Yes, also a small transistor.  ;D


https://www.richis-lab.de/Bipolar52.htm

 :-/O
 
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Offline exe

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Re: Transistors - die pictures
« Reply #381 on: April 21, 2021, 01:19:12 pm »
Although pnp transistors have often worse specifications than npn transistors the CDIL BC560C has the same edge length as the CDIL BC550C.

Yeah, I wonder about that, according to datasheets, their collector-base capacitances are identical. Their die geometries seem to be the same or very similar. Perhaps, they tried to make matching devices? If so, they succeeded. Or, may be, N-devices are only smaller when it comes to fets?
 

Offline Noopy

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Re: Transistors - die pictures
« Reply #382 on: April 21, 2021, 04:15:19 pm »
Although pnp transistors have often worse specifications than npn transistors the CDIL BC560C has the same edge length as the CDIL BC550C.

Yeah, I wonder about that, according to datasheets, their collector-base capacitances are identical. Their die geometries seem to be the same or very similar. Perhaps, they tried to make matching devices? If so, they succeeded. Or, may be, N-devices are only smaller when it comes to fets?


Philips BC550 and BC560 were different in size...  :-/O

Edit: It looks like the BC560 has a smaller "base contact frame" and so more active area than the BC550.
« Last Edit: April 21, 2021, 04:21:19 pm by Noopy »
 

Offline Noopy

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Re: Transistors - die pictures
« Reply #383 on: April 28, 2021, 08:11:13 am »


OC811, the first junction transistor built in the GDR.
20V / 15mA








The usual construction...










In some of the OC811 it seems like they had problems with the production quality.  :o


https://www.richis-lab.de/Bipolar53.htm

 :-/O
 
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Offline exe

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Re: Transistors - die pictures
« Reply #384 on: April 28, 2021, 11:18:57 am »
Ah, hand soldering, good ol' days :). In the USSR we had a rumor that only women were hired to do the final assembly (i.e., attaching bond wires). Also, I was told they were not allowed to open windows in the facility as that would half the yield due to impurities in the air and drafts. Do you know any anecdotes about semiconductor production back in the day?
 

Offline Noopy

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Re: Transistors - die pictures
« Reply #385 on: April 28, 2021, 02:27:59 pm »
I have heard of erratic low yields in one of the old american semiconductor companies. Most of the time everything was perfect and sometimes the yield was really low. It took them some time to realise the root cause was a farmer who from time to time sprayed herbicides. His field was located besides the factory. The chemicals made their way through the air supply and killed the devices.  :-BROKE

Offline Noopy

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Re: Transistors - die pictures
« Reply #386 on: May 04, 2021, 04:21:57 am »


ON Semiconductor BC546B. The high voltage type of the BC5xx series (65V).
...well, at least it should be a ON Semiconductor BC546B. You can´t be 100% sure. These small packages and dies give you almost no hint who is the manufacturer.
The pins are not covered with tin completely. That´s seems a little odd to me.  ???






The die is 0,33mm x 0,33mm.





ON Semiconductor BC546C. Index C gives you the highest hfe (420 - 800).






Unsurprisingly the BC546B uses the same die as the BC546C.


https://www.richis-lab.de/Bipolar54.htm

 :-/O
 
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Offline Noopy

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Re: Transistors - die pictures
« Reply #387 on: May 06, 2021, 03:25:43 am »


ON Semiconductor BC556B, the PNP type beside the B546.






Same size, same structure.  :-/O


https://www.richis-lab.de/Bipolar55.htm

 :-/O


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