Breadboarding an SOT-89
Nothing much, just a wee little hack I did to check some components I saved from an old board were still working. I'd recommend using purpose-built boards and adapters for more expensive things.
This bodged method was just a quick, easy way for me to test out some less expensive (free) components.
Here is a "11DE" from what I can tell. All of the SMD dictionaries I've tried can't actually give me a more meaningful part number from this abbreviation. However, from looking at where in the circuit it lied, I was able to deduce it was likely some form of voltage regulator.
I dived into my pigtails jar and bent up three leads for the thing. Bending and soldering the leads took all of about 2 minutes.
On the board
I was then able to plug the thing into breadboard. In the first picture, it is difficult to see since SOT-89 packages are only about 2x4 mm, but off in the top left corner is the so-called "11DE" device. It blends in with the black IC clip under it, but it's to the left of the yellow and orange jumpers. Trust me.
Seems like a 3.3 V regulator from what I can tell. Something interesting to note is that it doesn't appear to require an external load in order to regulate. I was able to completely remove my external 1 k resistor and it kept at 3.3 V, regardless of input. This might be a fluke, or it might actually have this taken care of internally.
For what it's worth, the pinout:
____ __/____\__ | | 1: Ground | 1 1 | 2, Tab: Input | D E | 3: 3.3 V Out |__________| || || || 1 2 3
Like I said, I was unable to find a meaningful part name, let alone a datasheet for this thing, so I have no idea as to the maximum input voltage and dissipation. All I know is that it will run to at least 12 VDC input as this is what it was doing in the piece of computer equipment it came from.
Here is a bit of a better look at the jig I use for holding stuff like this under my microscope. I have too many neodymium hard drive magnets lying around doing nothing, so they find use holding screws and making things (tweezers in this case) magnetic so they can hold things.
I also keep a small plastic mirror behind in order to help soften and reduce any shadows from the ring light.