EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: Greybeard on June 27, 2021, 03:13:41 pm
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Who can identify this component?
(https://www.eevblog.com/forum/repair/who-can-identify-this-component-pti200-or-pt1200-(ti)/?action=dlattach;attach=1231102;image)
Result of diode check:
pin 1 to pin 2: 0.6V (vice versa: open)
pin 1 to pin 3: 0.6V (vice versa: open)
pin 2 to pin 3: open (vice versa: open)
Obviously there is a sequence of n-p-n junctions, so probably it's an NPN transistor.
I could not find a data sheet for a "PTI200" or "PT1200", can anybody help?
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The date code appears to be 928. Would that be week 28 of 1989, 1999, 2009, or 2019?
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The date code appears to be 928. Would that be week 28 of 1989, 1999, 2009, or 2019?
Sorry, I don't know, but it's definitely not 2019.
Why is it relevant?
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The date code appears to be 928. Would that be week 28 of 1989, 1999, 2009, or 2019?
Sorry, I don't know, but it's definitely not 2019.
Why is it relevant?
You can look up old TI databooks.
https://mirrorservice.org/sites/www.bitsavers.org/components/ti/_dataBooks/ (https://mirrorservice.org/sites/www.bitsavers.org/components/ti/_dataBooks/)
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You can look up old TI databooks.
https://mirrorservice.org/sites/www.bitsavers.org/components/ti/_dataBooks/ (https://mirrorservice.org/sites/www.bitsavers.org/components/ti/_dataBooks/)
Nice logic, memory, uC and linear IC data resource, but I could not find a transistor data book from TI...
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I apologize in advance for reviving this old thread, but I believe this will help future people coming across this thread in search of the same information as me or the OP.
I came across a similar "PT1200" component which also tested like an NPN in the instrument cluster from my 1989 Volvo 740. As this was the only place on the internet that I could find referring to it, I contacted Texas Instruments requesting a datasheet or even just a description of what it was. They don't have a datasheet for it, but after reviewing the circuit diagram out of which this component came from, the engineer team that responded to my support ticket was pretty confident that it is actually a TIP120 Darlington NPN, with a "customer-specific marking".
Hope this helps future confused people about the origins or identity of the PT1200.
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I ... was pretty confident that it is actually a TIP120 Darlington NPN, with a "customer-specific marking".
(https://www.eevblog.com/forum/repair/who-can-identify-this-component-pti200-or-pt1200-(ti)/?action=dlattach;attach=1680625;image)
I think my measured diode check results do not confirm your assumption:
Result of diode check:
pin 1 to pin 2: 0.6V (vice versa: open)
pin 1 to pin 3: 0.6V (vice versa: open)
pin 2 to pin 3: open (vice versa: open)
Probably I have some TIP 120/121 in my stock.
When I'm back home, I try to compare it with the PT1200 at the curve tracer.
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Maybe this is the version (case size &) of the letters "D" or "O"?
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Maybe this is the version (case size &) of the letters "D" or "O"?
I didn't get the point you mean. :-//
What you mentioned is just the case dimensions...
New result of my TIP120 (TI) diode check:
pin 1 to pin 2: 0.60V (vice versa: open)
pin 1 to pin 3: 0.81V (vice versa: open) = two B-E junctions in series // R1+R2
pin 2 to pin 3: open (vice versa: 0.53V) = (parasitic?) CE-diode
That meets the TIP120 spec/schematic but not my initial measured PT1200 values.
PT1200 pin 1 to pin 3: 0.6V (vice versa: open) indicates it is a "normal" NPN, not a darlington.
So I'm almost sure, my PT1200 is not an OEM/customer version of TIP120.
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Maybe this is the version (case size &) of the letters "D" or "O"?
I think he meant that the last token on the marking is either a D or an O. I myself think it is a D, so TP120D, but could not find any reference on the web for it either.
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Maybe this is the version (case size &) of the letters "D" or "O"?
I think he meant that the last token on the marking is either a D or an O. I myself think it is a D, so TP120D, but could not find any reference on the web for it either.
Ok I understand.
But I've checked "TP120" before without success...