Who can identify this component? "PTI200" or "PT1200" (TI) - Page 1
Forum section: electronics / repair

author: Greybeard
author_rank: Frequent Contributor
timestamp: June 27, 2021, 03:13:41 pm
content: Who can identify this component?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?

author: fzabkar
author_rank: Super Contributor
timestamp: June 29, 2021, 03:25:45 am
content: The date code appears to be 928. Would that be week 28 of 1989, 1999, 2009, or 2019?

author: Greybeard
author_rank: Frequent Contributor
timestamp: June 29, 2021, 09:24:50 pm
content: Quote from: fzabkar on June 29, 2021, 03:25:45 amSorry, I don't know, but it's definitely not 2019.Why is it relevant?

author: fzabkar
author_rank: Super Contributor
timestamp: June 29, 2021, 09:38:51 pm
content: Quote from: Greybeard on June 29, 2021, 09:24:50 pmYou can look up old TI databooks.https://mirrorservice.org/sites/www.bitsavers.org/components/ti/_dataBooks/

author: Greybeard
author_rank: Frequent Contributor
timestamp: June 30, 2021, 09:55:33 pm
content: Quote from: fzabkarNice logic, memory, uC and linear IC data resource, but I could not find a transistor data book from TI...

author: PJMOR
author_rank: Newbie
timestamp: November 02, 2022, 10:28:25 pm
content: 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.

author: Greybeard
author_rank: Frequent Contributor
timestamp: January 04, 2023, 11:35:33 am
content: Quote from: PJMOR on November 02, 2022, 10:28:25 pmI think my measured diode check results do not confirm your assumption:Quote from: Greybeard on June 27, 2021, 03:13:41 pmProbably 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.

author: asis
author_rank: Frequent Contributor
timestamp: January 04, 2023, 02:16:30 pm
content: Maybe this is the version (case size &) of the letters "D" or "O"?

author: Greybeard
author_rank: Frequent Contributor
timestamp: January 04, 2023, 07:55:55 pm
content: Quote from: asis on January 04, 2023, 02:16:30 pmI didn't get the point you mean.What you mentioned is just the case dimensions...New result of myTIP120 (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+R2pin 2 to pin 3: open (vice versa:0.53V) = (parasitic?) CE-diodeThat meets the TIP120 spec/schematic but not my initial measuredPT1200values.PT1200pin 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.

author: pcprogrammer
author_rank: Super Contributor
timestamp: January 04, 2023, 08:07:38 pm
content: Quote from: asis on January 04, 2023, 02:16:30 pmI 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.

author: Greybeard
author_rank: Frequent Contributor
timestamp: January 04, 2023, 08:09:34 pm
content: Quote from: pcprogrammer on January 04, 2023, 08:07:38 pmOk I understand.But I've checked "TP120" before without success...