 All right, this week's Ion MPI is brought to you by Bornz. That's the product we're doing. And did you key, of course, because that's where we're going to show you where to get this. Lady Aida, what is the new product of the week this week? Okay, so this week's Ion MPI is from Bornz, and they have an awesome logo, as you can see. Just love that little, like, twist on the R. It's like bangs. We actually featured Bornz like a month, a month and a half ago for their dual concentric glittery encoder. So but it's, you know, sometimes you get lucky, you come up like a month or two later. So this week we're showing off the Bornz, let me get the exact part number. Well this is the MF-LSMF200 slash 24X SMD PPTC fuse. Basically it's these really high-powered, polymetric, PTCs, which are positive temperature coefficient fuses. I love this rendering. They do even kind of look like that. There's kind of cool gold and black color. And they're basically high-voltage, high-current fuses that are resettable so you can use them in your design. Even if you're using a lot of current, like for big LED or motor type projects, there's ones in this fuse series I think that go above 35 volts and 6 amps. So it's quite a lot for a PTC fuse. So these come in a family. This is the, the whole series is called the MF-LSM-MF series, the PTC resettable fuses. And you can see here it's just the top of the chart. The chart's quite long. All of them have really good testing, really good quality. Bornz has been making fuses and PTC fuses for a while. They're not tiny, but they're low-profile and they're easy to pick in place with a big range of Vmax, which is the voltage to expect. I-Hold, which is the current that you can pass through safely at a given temperature. And I-Trip, which is usually about twice or ish, you know, one and a half, one and twice as much as I-Hold. And that's when the fuse will trip. And by trip, I mean it will open up and disconnect both sides. So normally it's closed, the current goes through. Current goes above a certain amount that could integrate a short or some sort of failure inside. It opens up and protects the circuitry from damage. This is from a really great video that we'll show a clip of later from Digikey. They did a really great video about NTC and PTC thermistors. And so they actually showed that there's two kinds of thermistors, the Solister. And I actually had never heard of the Solister. Not a Solicitor, which is kind of like a British lawyer, I think, but a Solister. And Solisters you see are PTCs, but they have like a steady rise up. And those are tends to be used for, you know, measuring temperature because you see a very linear relationship between temperature and resistance. And so if you know the resistance, you can easily calculate the temperature. Whereas the switching type PTC, which is the kind of use and fuses, you can see it actually, I didn't know this, the resistance actually drops a little bit with temperature until it hits Tc, which is the Curie temp. When it hits Tc, the resistance, you can see it spikes up really high. And that basically opens up the circuit. So it's this nice graphic again from Digikey shows. Low resistance when temperature is cold. High resistance when temperature is warm. And what's neat is as it cools down, it can go back to low temperature, low resistance. This is unlike most fuses. Got this pick from Flickr, the credit's going to be in the text because they got cut off. But you see here the fuse, when it blows normally like a wire fuse, it doesn't reheal. It's blown once. You have to replace it. And usually there's easily replaceable fuse. You can pop it out. It's not soldered onto the board. But with these, they heal themselves or self-healing because as the current, the short goes away, the circuit is open, the PTC will slowly cool down. And then it'll re-close again, basically re-trying later. I do want to mention, Borns does have some one-time fuses that are circuit mountable, like surface mountable. So just watch out. These are like, I think they're called like one-shots or something. But these are the PTC ones I'm talking about. And you may be familiar because we have these on a lot of our boards. These are some green generic ones that we have on our Metro. We use them to protect the USB port. This is like a 5 volt, 500 milliamp or 1 amp fuse. And that's why you, for a lot of modern electronics, if they suddenly stop working, sometimes if you unplug it and wait a few minutes and plug it back in, it will work because you give a chance for that PTC to cool down again, which is great. So one thing to think about is, okay, as more current's flowing through, the temperature is up and then it pops open. It does mean that the trip and hold temperature will vary with the ambient operating temperature. And to keep in mind, if this is inside a machine or robot that's very hot because there's a lot of heat emanating from a motor or a motor driver, just be aware you'll have to de-rate. So you might have to pick, you know, you don't want the heat to add to the, you add that to the TC, temperature carry, and now, you know, you're tripping a lot earlier than expected. So you might, if you normally would want a 2 amp fuse, maybe a 3 amp, because you're de-rating by 50%. So just keep that in mind when you're, especially if you're doing robotics or LEDs with a power supply or temperature, because there's self-heating from the circuitry itself. So Digikey has, like, thousands and thousands in stock, which is great because I always love to do an INMPI where you can get the thing. So go to Digikey. I just picked the first one, which I think is this 24 volts, 4 amp one. And I can quickly show it on the overhead so people have an idea of the size, and we can show the video. Boom. Okay, so let me get so close. So this is just a strip of 3, so you see they come on cut tape. And let me just carefully peel away. And yeah, you can see it's kind of got a ceramic-y outside. It's got these really cool lines on the inside, big gold pads for lots of current transfer, but otherwise a great looking. And for the amount of current that this passes, amount of voltage, not too big. So usually PTCs were known for maybe an amp or so at the most, but now you can do up to 6 amps easily with these surface-mountable fuses. All right, let's play the video. PTC or positive temperature coefficient thermistors are made of materials that increase resistance in response to a rise in temperature, while a decrease in temperature decreases their resistance. These are typically placed in series with a circuit, as inline, resettable fuses to protect against overcurrent situations. Here, when the overcurrent situation occurs, the temperature rapidly spikes, causing the thermistors' resistance to increase as well, reducing the current that is allowed through. There are two varieties of PTC thermistors. The first is a silicon-based thermistor called a silister, which has temperature characteristics that follow a linear temperature curve with resistance gradually rising as the temperature rises. These are not very common, but do exist. The second is a switching type. These behave like an NTC thermistor until they cross a temperature barrier called the curie point or curie temperature. The curie temperature is a defined temperature trip point at which certain materials lose their permanent magnetic properties, which in short affects the device by creating barriers when it reaches the curie temperature to allow the resistance to increase.