 All right, the great search is brought to you by digikey. Thank you digikey and Adafruit Lady to use their skills of an engineer to navigate the digikey site to find the things that you're looking for more so and ever that's the most important thing because Planet Earth ran out of parts. I know we have a lot of sand, but we don't have any Yeah, so what's the great search this week? Okay this week's great search So one of the nice things about the great search is what I do is during the week when I'm struggling with finding a part because every week there's a part that I can't get and You know me and the purchasing team we use our wits to Find alternative parts, which is it is an engineering skill You're speccing the parts one thing but then being able to find alternative spec parts is important also It's really easy to get the exact same component every time But eventually that component is not available and that's happening a lot So let's talk today about one of the most jelly bean components. We use which is the BSS Dual can you say what jelly bean is for those folks who aren't in this industry jelly jelly bean? I don't know where this came from. I picked it up from someone But jelly bean means it's a part that's so common that it's made by multiple places like a 7805 Linear regulator right very very common made by multiple companies. It's well-spec It's not a unique part like I was showing off the IS the 31 FL 3741 That's a very specific chip If anyone knows why it's called jelly bean put in the chat because this week coming up LeVar Burton's hoping hosting Jeopardy and I know this is gonna be a Electronic component history. Yeah, but if you know why it's called jelly bean are the origins of it No googling allowed because I can Google later, but um that I've heard this to yeah And I've heard bunny say it to me like I don't know I heard it from bunny like 15 years ago, so I have a feeling this is an older industry term But anyways, yeah, it'll probably be the final jelly beans basically it's the things that you sprinkle that are not You know, there's there's the Wi-Fi chip the Bluetooth chip this press of chip This is like, you know, there's only one place to get it and then there's there's jelly beans Okay, so the jelly bean part we're talking about today is the dual BSS 138 and channel MOSFET so this part as shown here we use Tens and tens of thousands like a hundred thousand a year easily because they go on to every one of our breakout as level shifters We use them to level shift I squirt see, you know pull-ups on either side Why do we do a level shifting I squirt see because? When we sell sensors a lot of sensors like 99 999 percent of sensors and devices are 3.3 volt logic and power Although, you know, we do have a couple 1.8 volt ones as well Which is important. We'll actually talk about that and I want to make sure that people can plug in their boards into an Arduino Uno or Mega or a zero or you know an ESP32 you don't know if it's gonna be five or three volts on the other side And we want to shift the I squirt see logic and nothing beats the simplicity and price of This to end channel FETs for pull-up resistors and your golden in fact, this is NXP in their kind of famous I squirt see level shifting techniques and bussines. It's like a tome a famous work You know, they show this off and they they talk about it And then the shows, you know, this is this is basically what's going on You have I squirt and either side and this does a great job and this is a rock rock rock solid design I mean I've used this hundreds of I have some breaking news Jelly bean dates from the early days of Intel and Fairchild so me conductor referring to common chips Gordon Moore may have coined the term jelly beans You know, if it's not true, you've you've totally tricked me Well, if we're gonna start misinformation Let's just start with this is a bed. This is way better than most right Okay, so So that you know, I the beats this 138 I've really liked it and I've used for it's kind of famous people use it a Lot and I like the dual Fet because you know, you need to so why not just have it in two. So this is the This is the piece it's a sought 363 it's small. It's easy to pick in place. It's you can hand solder it It's it does the job. It's great except when you cannot get any so I was on I did you key Earlier this week because we you know, we're like, okay, we need more BSS 138 Duals and so just show, you know, when you go to You know, they have some exact matches, but we want the array because we want the dual and Then if you look zero zero zero zero zero zero zero zero zero all out of stock and and like I have never seen this in my life There's always like a million of these on stock because again, they're so jelly bean. They're used everywhere Time to freak out and give up now time to use our great searching power to find an alternative and Note that this is a jelly bean beat the BSS you see it's made by MCC and diodes and next period This is the one situation where not only is that I tend to buy the next period part But all the alternative sources for the jelly bean are also out, right? So it's not like I'll just find it from another maker. We actually have to find something that has a different part number with the same functionality so let's You know, I like to use the Product attributes as a way to pick out which ones to get so let's go with active dual and channel I'm not gonna necessarily pick the logic level gate the drain to source voltage actually it's 60 Don't need that much right obviously. We're not dealing with more than a couple volts I don't want to be specific about the RDS on under current drain because again It's it's a little flexible with that But I am really picky that I want to be surface mount and I want it to be a sought 363 because that I needed to be drop in replacement So let's view similar and You got about a hundred and eighteen options since I really need to you know I need to have this and suck. I'm just gonna pick in stock immediately to pair down the options So the next question is like what of all of these things are important Well RDS on is something that you care about when you're dealing with a power transistor We have a lot of current passing through because the RDS on determines the voltage drop across the The drain and source in this case. It's logic level shifting. So I don't you know I wish I could actually hide You know this and say like I don't even want to look at this option I don't care about that also current. There's almost no current passing through here. This is a logic level This is you know milliamp. Maybe when the it gets pulled down almost nothing So You know power max the temperature a lot of these things actually not important But there is one thing that is important which is the VGS Why? because when you look at here this voltage Especially for the low voltage you should be able to turn this on and off Based on the lowest voltage that you will encounter on the bus So if you're doing 3 volt to 5 volt you just have to make sure that the VGS is You know greater than 3 volts because you just want to be turned on and off I like that a little bit lower than just on the edge even though it's the max in case you're you know Your power supply droops and it's not exactly 3.3 and it's 3 so you want it to have a little bit lower So maybe 2.6 volts However, we use these transistors also to logic level shift 1.8 volts like the SGP 30 Gas sensor a couple other sensors. We use our 1.8 volt. We have 2.6 volt logic There's a couple not a lot but enough that I want to make sure that I don't mess things up for them because Believe me. I have accidentally placed a two-end 7,002 Dual-fet and it will did not work on low voltage Level shift. I think it was at 7,002. I don't know the exact number But basically it didn't have a low enough VGS it did turn on voltage was too high. It didn't turn on and off So what do you want to do is make sure it doesn't you know the the bss 138 Did you key? I don't know. Yeah, look up the part number You know we go to the point when we show stuff on Desk of lady to we make sure we purchase it before we talk about it Yeah, I already buy but you'll see like why are you showing this off? There's only 5,000 stuff yet because I already bought like we're we learn we learned our lesson my lesson mistakes were made Lessons were learned. That's it. It's a new segment. So we're not doing it this week because it's a box But um the new segment is called mistakes for made lessons are learned So this will help all of you out there thinking you need to be perfect. You don't just be honest Okay, so this this what I'd like to bet the bss 138 is it has this VGS you see here 1.6 volts You don't have to be exactly 1.6, but you want it you want it less than 1.8 And a little bit less than 1.8 and you'll notice that actually there's nothing here. That's exactly 1.6 That's why you don't want to be I didn't click that off because it's like it just can't be larger than 1.6 So let's let's select everything less than that and You know, I don't really care about the VDS or anything here and nothing else here is that important to be honest Um, and then when you go down here, we actually have a couple options again, you know, but these are all in stock You'll know that None of them have hundreds of thousands in stock because I kind of purchased a bunch of them But they all have the same package and here's the good news All these have the same pinout the dual-fet pinout is a standard pinout like they they are symmetric and equivalent So yes, I'll check the datasheet, but you can in this case just trust me already looked it up So what I did was, you know, I only really care about price in this case because you know the specifications are that important And so actually found the alternative which was an NX 138, which is actually I like the look of that Right VSS 130 ends in the NX 138. This is kind of a good feeling about it It matches the specs, but I also like it when they reuse the part numbers It's a little bit of a hint kind of telling you like this is going to be Similar as a drop-in replacement. So, um, this is the part. So this is you know, there's there's still some in stock I didn't buy them all Did buy a couple So that we can keep making our breakouts because it's it's you know, I need I really need to have a dual-fet Every single one of our breakouts everyone for stem IQ T points. So they do have a question about it So sir pull-up resistance on the board. I assume I don't need to add them. You know, we put very weak pull-ups 10k, which is good for you know, 100 kilohertz I squared C if you want to run one megahertz I would recommend adding another one, but 10k is a nice balance of You're not gonna hang your I squared C bus a little ground at 100 kilohertz or 400 kilohertz Which is like kind of you know, what most default buses when that but also if you put multiple of them in parallel You know because you plug in I squared C multiple QT boards You can plug, you know up to five of them and then you'll still only have a 2k pull-up You know, it that's what it'll look like to the host which is the standard pull-up size So what I'd like is you can put like five to ten and the host will get overburdened by the pull-up So that 10k I'm like a 10k kind of girl. All right, someone has I think this might be a future Yeah, great search or it's a general question. Yeah, I'm not quite sure it says how did you use piezo piezo electric actuators for? replacement parts for in-body image stabilized cameras. Oh Goodness, those are gonna be really custom I really think what you should do is is try to I would actually go on eBay to be honest and see if you can find Yeah, that's also camera repair. I think that's in the camera repair category Different it's a different thing, but you want to find people who are throwing away Cameras was like broken lenses or broken mainboards, and then you can maybe recycle That the piezo actually about like oh, yeah, that's I feel like there's an industry around this that I don't know about It's it's custom-ating piezo is super custom. All right, so that's the great search. Thanks everybody