IRFI540N install orientation and lack of availability

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IRFI540N install orientation and lack of availability

Postby NE5U » 21 Nov 2017 22:50

Q6 and Q7 are somewhat unobtanium. I found some allegedly NOS for sale on eBay but that's always a crap shoot. That said, the crooked logo on the supplied transistors makes them suspect as well. The scarcity of these parts does not bode well for future repairs. Is there a substitute?

The silkscreen shows the tab is away from the edge the board yet the rear panel has what appears to be a place to heat sink the MOSFETS. Which way are they supposed to be installed?
73 NE5U
Mike

“I have never been lost, but I will admit to being confused for several weeks”
- Daniel Boone
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Re: IRFI540N install orientation and lack of availability

Postby NE5U » 21 Nov 2017 23:23

I found all of the documents so I can answer the orientation question. As you would expect, the MOSFET is attached to the back panel.
73 NE5U
Mike

“I have never been lost, but I will admit to being confused for several weeks”
- Daniel Boone
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NE5U
 
Posts: 14
Joined: 20 Apr 2017 12:46
Location: USA


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