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Old 14th Mar 2018, 11:44 am   #1
tri-comp
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Default Request for Data on ON5233 DPAK FET

I need to replace a shorted-out ON5233 FET but I'm unable to find any data on the web for this part.
Most likely manufactured by NXP even if they have absolutely no info available on their site for the thing.
In the past I've used UK company Littlediode with some success as a source of obsolete parts but they're not able to help this time.
Can anyone here please share data or ANY info in fact on this part ?
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Old 14th Mar 2018, 2:04 pm   #2
Boater Sam
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Default Re: Request for Data on ON5233 DPAK FET

If you cannot find any reference to this part number then it is likely that no one here will either.

What is it part of?
Is the number off the part or the service sheet?
What does it do?
What voltages and current is it subjected to?
Do you have a part circuit diagram we could study and work out what would replace it?
Or is it a safety related part you need a direct replacement for?

FETs are not one of my knowledge bases I'm afraid.
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Old 14th Mar 2018, 2:16 pm   #3
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Default Re: Request for Data on ON5233 DPAK FET

I have a copy of the VRT comparison table published by ECA Electronic. Unfortunately it is a 1999 copy and the ONs stop at ON4542. Perhaps someone here has a later edition and can give you an equivalent. Later editions were also distributed on CD.
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Old 14th Mar 2018, 8:06 pm   #4
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Arrow Re: Request for Data on ON5233 DPAK FET

This might help:

https://www.mouser.co.uk/ProductDeta...w%2flI4iGcMQ==

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Old 14th Mar 2018, 9:11 pm   #5
WME_bill
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Default Re: Request for Data on ON5233 DPAK FET

Part Number ON5233. That sequence makes me think of the Philips in house type numbers used for specially selected items in their own test equipment.
If you can reply to Boater Sam's questions, then I think we could make considerable progress.
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Old 14th Mar 2018, 9:22 pm   #6
tri-comp
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Default Re: Request for Data on ON5233 DPAK FET

The FET is part of an Opel ECU about 10 years old, no schematics.
I desoldered another, working ON5233 from the board and checked it with a cheap transistor-tester I got off eBay.
It was identified as a N-Channel Enhancement mode FET with a Gate Treshold Voltage of 3,14V and an input Capacitance of about 1,7nF.
The latter may be a bit high. The meter is also made for measuring capacitance and usually gets it right when calibrated to allow for stray capacitance, but when measuring FET's I believe it shows about twice the real capacitance for some reason.
With this info I have decided to replace the defective FET with a ST D10NF10 DPAK/TO252 which measures not precisely on the spot but close enough I believe.
(Half the input Capacitance and a Treshold voltage of 3,84V)
Tomorrow the controller goes back into the Opel and I'll know.
So will you.

I've attached an EOL list from NXP showing all kinds of ON-prefix devices.
Of course it doesn't show the ON5233. They have more EOL lists and I've checked quite many of them.
Absolutely NO mention of the ON5233. Maybe it was made to order from Opel ?
Attached Files
File Type: pdf _NXP EOL DN60a_2007-12-31.pdf (39.0 KB, 8 views)
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Old 28th Mar 2018, 6:16 am   #7
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Default Re: Request for Data on ON5233 DPAK FET

Went past the garage yesterday to ask for any status on the Opel ECU-repair.
It turns out the Opel is still not working, starter not kicking in.
I had a chance to check the replacement FET I mounted and it's OK.
Something caused the original FET to short-out but apparently it's not a permanent problem/short or maybe it was caused by the repairstaff placing the disassembled ECU, PCB right down on the car chassis as I found it when I arrived. Sure the chassis is painted and therefore insulated but really !!!
I accepted the defeat and left a whole lot wiser. I don't think I'll spend any more time in the future attempting repairs on ECU's.
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Old 28th Mar 2018, 11:50 am   #8
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Default Re: Request for Data on ON5233 DPAK FET

Have a look for electric power steering FETS.
They have a big gate making the capacitance high but make up for it with a very low on resistance.
All the big makers do them in both N ana P gate.
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Old 28th Mar 2018, 10:34 pm   #9
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Default Re: Request for Data on ON5233 DPAK FET

I believe this is just what I used.
The ST D10NF10 I used has a Rds(on) max. of 0,13 Ohm.
This should be adequately low to control any solenoid or relay imho.
Combined wiring and multi-connector resistance between the FET and whatever it's controlling should be much higher.
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Old 28th Mar 2018, 11:40 pm   #10
kevinaston1
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Default Re: Request for Data on ON5233 DPAK FET

I have a feeling that this is one of those obscure FET's used on television sustain and drive boards.

If you know anyone who works in the TV service industry, and has an account with ASWO, they would be able to check this out for you, and possibly suggest a suitable replacement.

Regards.

Kevin
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Old 29th Mar 2018, 12:32 am   #11
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Default Re: Request for Data on ON5233 DPAK FET

I would guess that you are looking for something along the lines of a starter solenoid driver.
Farnell is not on line tonight but all the same RS have an example for you to look at.
https://uk.rs-online.com/web/p/mosfe...stors/7904609/
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Old 31st Mar 2018, 8:36 pm   #12
tri-comp
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Default Re: Request for Data on ON5233 DPAK FET

Quote:
Originally Posted by kevinaston1 View Post
If you know anyone who works in the TV service industry, and has an account with ASWO, they would be able to check this out for you, and possibly suggest a suitable replacement.
Thank You Kevin,

I actually have an ASWO acc't of my own and it was the first place I looked.
I used to be a Radio & Television repair tech, but those days are long gone.
To make a living I'm now using my repair skills to repair various sorts of electronics in industry and automotive relations. It's really not that different; bad cap's are all over the place

And I did look through RS-Components and didn't find any info for an exact replacement.
However, I believe the FET I choose is OK for the purpose which could easily be solenoid/relay drive. There's most likely other issues with the ECU. The PCB was heavily covered with corrosion from water leaking through the multi-connectors. I removed what was in sight but it's impossible to get at whatever corrosion hides under the PCB multi-connectors.
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