Hi,
while investigating my stashes I found these three devices that I had pulled from 1970ies equipment a long time ago. The designation of the left handed one is barely visible, but clearly shows INTERSIL as the manufacturer. The one in the middle and the right handed ones show AN 122 as the designator. They've got six pins, arranged in two groups of three each. Searching through the WWW didn't help to define them, most probably 'cause they're obsolete for a very long time. Does anyone know what I have here?
Best regards!
while investigating my stashes I found these three devices that I had pulled from 1970ies equipment a long time ago. The designation of the left handed one is barely visible, but clearly shows INTERSIL as the manufacturer. The one in the middle and the right handed ones show AN 122 as the designator. They've got six pins, arranged in two groups of three each. Searching through the WWW didn't help to define them, most probably 'cause they're obsolete for a very long time. Does anyone know what I have here?
Best regards!
Attachments
Intersil was very early into MOS transistors. I've some siliconix E105 transistors that have a black case like that. DMOS they called it. From 1974. The datasheets are so far back in the attic I'd have to move 1000 lb of surplus to reach them.
Six leads might mean dual matched pair. I don't think they had thought of gate protection zener diodes then, so be careful probing.
Six leads might mean dual matched pair. I don't think they had thought of gate protection zener diodes then, so be careful probing.
In the WWW I've found Intersil transistor databooks from 1981 and 1984, but unfortunately no match 😎. Didn't think that these devices are that old that they vanished in the beginning of the 1980ies yet.
Best regards!
Best regards!
Not sure if this is the same part.
https://shop.micross.com/pdf/LSM_LS122_TO-71.pdf
http://www.linearsystems.com/lsdata..._Matched,_Monolithic_Dual,_NPN_Transistor.pdf
https://shop.micross.com/pdf/LSM_LS122_TO-71.pdf
http://www.linearsystems.com/lsdata..._Matched,_Monolithic_Dual,_NPN_Transistor.pdf
Thanks, gentlemen 😉!
lcsaszar, may I ask you where from you know that, and if you have further informations about these mystical devices? Even a schematic would be helpful.
Thanks and best regards!
lcsaszar, may I ask you where from you know that, and if you have further informations about these mystical devices? Even a schematic would be helpful.
Thanks and best regards!
Sorry for resurrecting my old thread again 🙄.
May I ask you how I can find out by measurements if these are dual BJT's, dual JFET's, dual MOSFET's or something else? Identifying a BJT might be easy, but would I possibly destroy a FET (or something else) by applying ohmmeter probes? Finally, how could I identify the pinout after having learned to know the technology?
Best regards!
May I ask you how I can find out by measurements if these are dual BJT's, dual JFET's, dual MOSFET's or something else? Identifying a BJT might be easy, but would I possibly destroy a FET (or something else) by applying ohmmeter probes? Finally, how could I identify the pinout after having learned to know the technology?
Best regards!
Apply "basics".
1) measure every pin against every another one in diode mode so you are actually measuring voltage drop when (trying to) pass about 1mA.
You may even measure current supplied by multimeter into another one set to current, say 20mA scale, and voltage applied , using 20V scale.
2) repeat but using resistance scale, say 200 ohm and 2k which is similar but keeping foltage as 200mV tops, to "avoid turning junctions on"
3) draw case and pinout and write values read, except open circuit which is presumed in many.
4) post it here so we can draw some educated guesses.
5) based on that I may suggest some simple test jigs, I do that all the time.
1) measure every pin against every another one in diode mode so you are actually measuring voltage drop when (trying to) pass about 1mA.
You may even measure current supplied by multimeter into another one set to current, say 20mA scale, and voltage applied , using 20V scale.
2) repeat but using resistance scale, say 200 ohm and 2k which is similar but keeping foltage as 200mV tops, to "avoid turning junctions on"
3) draw case and pinout and write values read, except open circuit which is presumed in many.
4) post it here so we can draw some educated guesses.
5) based on that I may suggest some simple test jigs, I do that all the time.
I have one of these: DCA75
At first I thought I just bought another gimmick that I would never use, but it's actually quite useful. Just hook up the three wires to the pins of a device and the DCA75 tells you what device it is, and which pin is what.
I have this simple tester, and some other (radioshack) transistor testers. Its a minimal investment, and it comes handy when you need to identify pins, match the gain in bjt, or idss in jfets, plus it provides other parts measurements, like capacity, resistance for unknown parts. Once you have it, you will use it all the time. I replaced battery with adapter and put it in the box.
LCR-T4 Mega328 Transistor Tester Diode Triode Capacitance ESR Meter NPN/ PNP | eBay
LCR-T4 Mega328 Transistor Tester Diode Triode Capacitance ESR Meter NPN/ PNP | eBay
Well, the tester that adason recommended just arrived the day before yesterday. Nice device, btw 😉!
It turns out that my devices are NPN transistor pairs with well matched hFE. But alas hFE is somewhat lowish with readings between 85 and 115. And I still don't know the Vce rating and noise figures. So I'd better discard them?
Best regards!
It turns out that my devices are NPN transistor pairs with well matched hFE. But alas hFE is somewhat lowish with readings between 85 and 115. And I still don't know the Vce rating and noise figures. So I'd better discard them?
Best regards!