Inventory

(20170326) (rev 20200524) The germanium inventory is there

So far, my silicon stocks are:

Reference	Pol.	Ft(Hz)	U(V)	I(mA)	P(mW)	hFE	Fab	Qty
BC549C	NPN	250M	30	100	625	400..800	CDIL	14500
BC550C	NPN	250M	45	100	625	400..800	CDIL	2000
BC559C	PNP	250M	30	100	625	400..800	CDIL	5000
MMBTH81	PNP	600M	20	50		60	Fairchild	9000
KSP10/ MPSH10	NPN	650M	25		350	>60	Fairchild	1500
BF970	PNP	1G	30	30			Philips	200
BF1009SZ	N-ch	1F	9	10			Infineon /Siemens	30
BFR96	NPN	3.2G	15	75				170
BFG425	NPN	3G?	4.5	30	135		NXP	200
BFS480	NPN	7G?	8	10		100 (30..200)	Infineon /Siemens	4800 (+?)
BFP420	NPN	25G	4V	60	200	60..130	Infineon /Siemens	100 (?)
2N2369A	NPN	500	15	200	360	20..120	MOT(?)	50
PMBT2369	NPN	500	15	200	250	20..120	Philips	9000

Note: Ft (transition frequency) is often misleading:

For the KSP10 it's given as the "Current Gain Bandwidth Product", the part is tested up to 100MHz only (with some plots up to 1GHz).
The BFG425 is given as a "25GHz" part but the datasheet gives data tested up to 3GHz.

Why a PNP in the middle of the NPN ? Because of Complementary ECL : it must be possible to "pack" some gates together to form a circuit with alternating polarities, save some time and gates, and power too. For example the BFS480 could be paired with the MMBTH81 (though the speed disparity might not be a great choice)

I stumbled upon a stock of 2N2369, they might as well be included in this inventory "for scientific purposes". https://hackaday.io/project/8449-hackaday-ttlers/log/177581-my-own-try-at-a-ringo9-with-2n2369a uses some of them and I tested the 5ns rise time with few efforts (it can go faster with more efforts).

Note: some BC549C are already gone to contribute to #The Cardboard Computer :-)

20200521 : added the PMBT2369 and the BFP420

Discussions

Dr. Cockroach wrote 01/06/2017 at 10:08

Hi Yann, I am going to watch this project very closely :-)

Are you sure? yes | no

Yann Guidon / YGDES wrote 01/06/2017 at 10:12

Don't hold your breath too much, it's just a "polished" version of the relay and germanium versions ;-) Hence it will come 3rd, as the germanium version is more fascinating :-D

Are you sure? yes | no

Dr. Cockroach wrote 01/06/2017 at 11:01

:-D

Are you sure? yes | no

Low-Voltage, Complementary Bipolar Logic

Discussions

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