Equivalent mosfet ? (TPCP8106 and TPC8125)

[corrize]

Hello, I need to replace a P channel mosfet TPCP8106 used as voltage comparator on the power board, and it is not available.
I found TPC8125, it's seems similar (P channel, same box, same pins) but can you check if the specs are equivalents pls ? I think yes but I'm not sure.

See pictures (or links of datasheets if needed).

Original mosfet (TPCP8106) datasheet
https://pdf1.alldatasheet.com/datash.../TPCP8106.html

New candidate (TPC8125) datasheet
https://pdf1.alldatasheet.com/datash...A/TPC8125.html

[corrize]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

Maybe a closest one ? TPC8129. This one has dynamic specs very similar (that the previous one didn't have).

https://cdn.badcaps-static.com/pdfs/...a83e5352d1.pdf

I add : this mosfet is on the power board, and works at 12v max (on battery). It seems used as protection, in static mode but not sure.

[eccerr0r]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

Knowing the as actual application is quite important as well as the circuit. As a reverse protection device, it/both are probably fine. As a switching transistor, the latter is probably a better swap. As a comparator, substitution is very dicey and even identical transistors may not work...

[corrize]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

What do you mean as « comparator » pls ? As comparator, I think comparing for prevent overvoltage or something like this. And not as logical signals comparator use. The board is this one (see picture pls), it's a power board and hub wich provide differents voltages (there is a 3v5v chip) look the larges tracks coming from large white connector (12v power input). The mosfet is just after. So in protection use ?

[eccerr0r]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

When i say comparator I mean it's used in a well balanced circuit to compare two arbitrary voltages. power mosfets are typically not used in this method but it's possible.

As far as I can tell from your circuit this is not a comparator and as a low frequency power switch and is probably one of the least critical applications to get matching characteristics.

[corrize]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

Ok, it's clear now, I know what I should order, thanks for the help.

[corrize]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

Hello, the mosfet was dead (checked : shorted) and I replaced it, and the board has the same issue. But a fuse burned and not the mosfet. But I can’t find any short circuit on the board, it is weird. I will probably open another thread for the board issue.

Here, I have a new component to identify on this board : this « blue » one, it’s a BGA chip with 8x8 balls, marked « 23250 ».
This board come from a DLSL camera, the board has some switching power supply, with coils, and this chip probably is a switching one. I can’t identify it. I found a chip MIC23250, but it is not good.

I found a similar chip marked 23251 on the other same DSLR board.
Do you know what is this chip pls ?

[jiroy]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

According to Wikipedia :

"Micrel was a global manufacturer of integrated circuits focusing on the networking and consumer markets. Microchip Technology announced the signing of a definitive agreement to acquire Micrel for $14.00 a share on May 7, 2015. The price per share represented a 3% premium over Micrel's closing stock price on May 6, 2015 and a 30% premium at the close on August 7, 2014. The total equity value was about $839M. The completion of the acquisition was announced on August 3, 2015 with 98.5% of Micrel shares that voted approving the merger. "

So I guess you have a problem of a discontinued product with no support anymore . I can assume anyway that 23250 and similar are hard to find .

[corrize]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

Thanks for reply, it's not a Micrel chip, the MIC23250 look like by the name, but it is not a BGA one. The chip to identify (on picture) is a BGA one.
A BGA chip with marking code 23250 or 23251 I found nothing on the web.

Edit : sorry, forgot to post the picture... It's the blue chip.

[jiroy]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

Thanks for reply, it's not a Micrel chip, the MIC23250 look like by the name, but it is not a BGA one. The chip to identify (on picture) is a BGA one.
A BGA chip with marking code 23250 or 23251 I found nothing on the web.

Edit : sorry, forgot to post the picture... It's the blue chip.

Okay . I'll see what I can find among my backups books references ..

[jiroy]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

All my researches indicate that this chipset is a variant of an old product made once by Micrel , and later released by other companies in different packages , and yet , also discontinued by those companies . The only available version now is from Renesas R2A23250BM and other variants , but no schematics or specs to be find other than being mentioned to sale on Alibaba and/or some really suspicious sites , but all with the same result , no specs to show ... Renesas even , in their site , do not recognize the chipset as theirs ...So guess it's discontinued too .

[corrize]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

OK, thanks for the help, I’m convinced it is not so old, I found a website wich list the Nikon DSLR with this chip inside. And there is the Nikon Z6 and Z7, made in 2018. I checked with a picture of Z6 board and it is present.
https://photo-parts.com.ua/parts/dbphp.php?part=23250

In the column, this website indicate : « Power manager, PWM controller » but it can be wrong, because there is some other various chips and for this one, there is no link to datasheet.

[jiroy]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

OK, thanks for the help, I'm convinced it is not so old, I found a website wich list the Nikon DSLR with this chip inside. And there is the Nikon Z6 and Z7, made in 2018. I checked with a picture of Z6 board and it is present.
https://photo-parts.com.ua/parts/dbphp.php?part=23250

In the column, this website indicate : « Power manager, PWM controller » but it can be wrong, because there is some other various chips and for this one, there is no link to datasheet.

The one in your cam isn't old , yes . But guess whose making it ? , that's the problem . The original one is some package made by Micrel and discontinued by Micron or sold to Renesas that deny anything about it and that probably no one can find anymore , and some companies took the advantage of the original design and made it in many different packages , and most of those are discrete , least to say ..

My only advice here , be careful to order anything from suspicious sites , and if you know which company your cam is , let them the repair ..

[corrize]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

Yes, I can’t really identify it, so I can’t buy it. If I really need it, I will find another faulty Nikon for donnor board.

[jiroy]

Re: Equivalent mosfet ? (TPCP8106 and TPC8125)

Yes, I can't really identify it, so I can't buy it. If I really need it, I will find another faulty Nikon for donnor board.

That's the right thing to do .. I had lot of similar problems and donor , broken , or any other defect causes can rescue ..