The LMK is complete 5V regulator fabricated on a single silicon chip. The available output current is greater than 1A. He is designed for. Order Number LMK STEEL or LMK STEEL. See NS Package Number K02A. Order Number LMK See NS Package Number K02C. 2. LMK STEEL/NOPB – Fixed LDO Voltage Regulator, V to 35V, 3mV. Add to compare. Image is Technical Datasheet: LMK STEEL/NOPB Datasheet.

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I’m testing them to make sure I’ve got the correct pinout and they work properly.

So here’s my question. For these transistors, brand new from Jameco, do these ‘s look right? For the LMK I’m not sure which is which, the data sheets only shows input emitter? Is this right for this transistor??? Honestly I’m not sure how to tell from the data sheet. Similar results with the LMK.

Again, I’m new to all this, but it doesn’t seem right. I ordered several transistors for each model lk309k they all behave the same way, which leads me to believe they are “right” Haha So are these readings what you’d expect to see from these components?

Thanks so much for your help!!!! November 19, Tekay Member Halmstad-Sweden Posts: Haha, okay, well that explains the weird readings then! Okay, well thanks very much for clarifying that! I’m going to research what the hell voltage regulators are and how they work so I don’t make a similar mistake down the road.


A voltage regulator is several transistors working together. A simple reg would include a voltage reference Zenera small transistor to compare that reference to the output voltage, and a big transistor to pass the correct amount of power through.

The regs you buy may have 40 transistors to improve action and reduce abuse little transistor are incredibly cheap. The first regs had 14 or 8 pins and may have needed an external transistor such as your 2N to handle big loads.

Today they have simplified down to 3 pins, which means they can use the same “frame” as power transistors.

LM309K Datasheet PDF

But a toaster, a radio, and a PC are all “boxes with wall-plugs”, yet not the same thing. While PCs usually don’t have bread-slots, with transistors and regulators you gotta go by the part number. That was a Clue. Transitors are simple incomplete functions lm3099k the pins have abstract names. Regulators are a specific complete function and the pin names make some sense.

LMK (NSC) PDF技术资料下载 LMK 供应信息 IC Datasheet 数据表 (1/8 页)

The Silicon diode hardly turns-on until you get 0. In old days we used Needle Meters which worked from a 1.

If forward across a diode they read about half-scale on all ranges. Today we use digital meters which mostly only use 0. As a first approximation, the diode does not turn on at all, should vatasheet OL infinity. In fact the conductance at 0. This is “too small for real work” but can be detected by many meters. Making some random assumptions about the side of diodes in a ‘, I get a number like a few million Ohms. Datashet 3Meg to 20Meg numbers are close enough. However there may be a few million Datasgeet of internal leakage in a large part.


All you really proved is that the legs are not broken-off. They could still be a break inside the plastic– a barely-not-rejected batch of plastic might have millions-Ohm leakage between pin stubs. When you study regulators you will find a couple of resistors out-to-ground. This divides the output to the same voltage as the internal reference. On some regs this is plain simple resistance, no diodes. The datashete plan for ‘ is not so simple, and I can’t identify your 3K at a glance.

LMK Datasheet(PDF) – National Semiconductor (TI)

But you buy pre-made regulators so you do not have to think about these things. If you must test: Get the polarity right!! Now measure 5V from Out to Gnd.

Note that the battery has to hold at least 7V into the part, because the minimum In-Out voltage is 1. And this still does not prove that your ‘ can carry the BIG current lm3309k you paid the big bucks for.

I understand wanting dataseet test.

However you bought adtasheet a very reputable source, reputable chips have defect rates below 1 in a million, you can just assume the parts are good until you wire them up and check ALL other possible errors. Wiring errors always exceed parts problems.