I'm a newbie so I'm not sure if I'm posting this in the correct section.

I have been searching for specifications for a discontinued mosfet I need to replace, or just for an appropriate replacement.

Manufacturer: International Rectifier
Part #: SPE063
IR #: IR909X

I cannot find it. I would appreciate any help.

 

I cant find datasheet for this part, consider posting a tech
request at Infineon, OnSemi, Microsemi website asking
for a cross reference.

Regards, Dana.

 

I cant find datasheet for this part, consider posting a tech
request at Infineon, OnSemi, Microsemi website asking
for a cross reference.

Regards, Dana.

Thank you Dana.
I have posted my request on Infineon. No response from them yet!

r_mcl

 

How do you know it's an IRF part? Probably the number is an "in house" number, many companies do this so you have to go to them for repair. You may get better help if you can tell what the device your working on is and give a schematic or good picture of the circuit board.

 

What's the mosfet doing/controlling on the pcb?

 

The 909X is almost certainly a date code; the X may designate a production facility

 

How do you know it's an IRF part? Probably the number is an "in house" number, many companies do this so you have to go to them for repair. You may get better help if you can tell what the device your working on is and give a schematic or good picture of the circuit board.

It sure looks like their logo.

 

It sure looks like their logo.

But not one of their part numbers.

 

Thank you for the responses so far.

I made an assumption it was IRF based on the I <symbol> R looking like the old International Rectifiers logo.

The mosfets are from power supplies from two portable chargers. Their connections burnt out when they were accidentally dropped some time ago and I'm swapping out dead parts to see if I can get them working again.

>> What's the mosfet doing/controlling on the pcb?
My noobiness (noobiousity?, noobitude?) runs deep. I've identified and swapped parts that were either obviously burnt or giving incorrect readings. 2 capacitors, one IC, 7 resistors and one fuse later, I'm down to the last - this unidentified mosfet.

In the pic I have put in an IRF840 as a replacement but haven't hooked it up yet - still hoping I may find the exact replacement. Asking on here was going to be my final search before playing mosfet roulette.

The good news is if things go south I can replace the entire board for only $40 plus shipping , so there's that.

 

Also, considering I've had no response from Infineon Support or on their forum, the mosfet roulette option (and then the inevitable $40 replacement) is looking like the winner.
If the IRF840 actually does work I believe my life-calling is to pick lottery numbers.

 

What is the AC input voltage for the supply?

I can't tell for sure from the picture, but I'd bet it is a flyback converter. If you post a photo of the whole board I could be more certain.

Flyback converters can subject the FET to voltage well above the DC supply. In a flyback, the thing that looks like a transformer really only acts like one when you would rather it didn't. The output voltage is "reflected" back to the switch by the turns ratio of the inductor. That ratio often has no conspicuous relationship to input and output voltage - sometimes the ratio is fiddled specifically to manage the reflected voltage. An IRF840 may not have adequate voltage rating, depending on the AC input voltage.

There is also a "leakage inductance" discharge voltage spike right after the FET turns off, but it looks to me like there is a snubber to take care of that (the two power resistors standing on end, a diode on end, and presumably a capacitor I can't really see very clearly). A lot of FETs are specified to actually allow the amount of energy in the spike to cause breakdown of the body diode without damage (repetitive avalanche energy).

"My noobiness (noobiousity?, noobitude?) ..."
I also struggle with such word endings. In my opinion all three forms are cromulent, but I suspect noobitude will ultimately become the accepted form.

 

And this week's lotto numbers will be...

Nope. Didn't work. I'm buying the $40 replacement.

 

 

Try a FQP12N60C, or 2sk2082, Nfet

 

Wow what a philosophy.

A too tiny and cheap cooler that will save cents at first.
Death of the PCB is preprogrammed due to overheating.

Customer needs a completely new PCB as replacement!

The PCB clearly shows signs of overheating, and perhaps the MOSFET is just on the margin.

Btw you cant just swap a high side MOSFET. These are highly specialized parts.
Also if there was a short or burnout, the IC also very likely will be finished.

 

Definitely a flyback converter.

I'm assuming that you have verified that there is correct voltage on the large input filter capacitor. If the FET isn't switching it should be close to the peak of the AC input voltage (about 165 VDC for 120 VAC). A shorted (by far most likely failure) FET will blow the input fuse (little reddish-brown round thing near the white AC input wire).

 

What is the AC input voltage for the supply?

I can't tell for sure from the picture, but I'd bet it is a flyback converter. If you post a photo of the whole board I could be more certain.

Flyback converters can subject the FET to voltage well above the DC supply. In a flyback, the thing that looks like a transformer really only acts like one when you would rather it didn't. The output voltage is "reflected" back to the switch by the turns ratio of the inductor. That ratio often has no conspicuous relationship to input and output voltage - sometimes the ratio is fiddled specifically to manage the reflected voltage. An IRF840 may not have adequate voltage rating, depending on the AC input voltage.

There is also a "leakage inductance" discharge voltage spike right after the FET turns off, but it looks to me like there is a snubber to take care of that (the two power resistors standing on end, a diode on end, and presumably a capacitor I can't really see very clearly). A lot of FETs are specified to actually allow the amount of energy in the spike to cause breakdown of the body diode without damage (repetitive avalanche energy).

"My noobiness (noobiousity?, noobitude?) ..."
I also struggle with such word endings. In my opinion all three forms are cromulent, but I suspect noobitude will ultimately become the accepted form.

It certainly looks like a flyback. for 230V supply, the MOSFET should be at least 600V and probably somewhere around 6A - the IRF part so far mentioned may not have the current capability.