 The great search brought to you by digikey and interfruit. Thank you so much digikey every single week lady It uses our power of engineering smarts and others focus to show you how to find stuff on digikey And this is a series that we started way before the ship shortage So if you watch this from beginning to end You'll probably be able to find that thing you're looking for because everything is hard to find now It's true that when I do the chip shortage ship today, but we're using some that isn't a chip short Although I'll show this this trends thing. So I'm gonna give her head and I'll show what I've been hacking on So I've been making some more boards and two of the boards that I designed and I sent off before the holiday break and just got back Are these real-time clock breakout boards? So these are stomach UT boards with the art my two favorites RTCs, this is the PCF 8523 and this is the DS 30 to 31. This is a temperature compensated and more expensive RTC This is a three or five volts Non-compensated, but still pretty good quality, you know easy to use inexpensive Just to pop on a 32 kilohertz crystal and you're going to be on this one has the crystal built in and For real-time clocks. You really want to have a battery for battery backup I like the whole point of the RTC is that it has a battery backup and keeps track of time Even when the rest of your system is the power. So you usually have a separate Coin cell battery Let's look at that. So nice look with cell battery. So, you know, there's a couple different ways to do it There are you know pick and placeable Non-rechargeable batteries primary cells, but I do like these CR 12 20s I find these to be great little coin cells. They're extremely common You can get them kind of anywhere They're three volts. So, you know, they're they're perfect for real-time clock real-time clocks like running off of these But again, they're available and they last like seven years But if they do get damaged you can replace them unlike the ones that are sort of the PCB So I do, you know, I do kind of like Having these You know removable replaceable coin cell batteries. This is a lithium cell and you can see barely on there It's a CR 12 20. So that means it's 12 meter millimeters diameter and two millimeters thick watch out There's also 12 16 1.6 millimeters thick or like maybe even 12 12 1.2 Very thin, but they might slip out of the coin cell holder. Just make sure So you you pop it in the back like this you see there's a plus symbol here plus symbol here you match it up you push it in and I kind of like this style and design and you can always Kind of get in here and pull out The battery with your fingernail as well There's also these kinds of coin cell holders These are the kind of the two that I see the most like there's a there's more But there's the from the side ones and there's from the top ones from the top ones The battery kind of snaps in like this Which one to use well, I'll tell you if if I have side access I kind of prefer these It's just my personal preference These are a little bit thicker. They're a little bit bigger But they're not too hard to use to remove the battery You just kind of push open and the coin cell pops up But for some reason I sort of prefer these I think they're a little bit more secure Although these are also very secure, but these are two options. So let's show on the great search How to find these two coin cell holders But first up I want to show you this is from Jepler point of the cells like this case a lot of hidden gems. This is a hidden gem lead time Trends and this is very handy for you to know What are you likely to get some chips? So here's some whoa? Went down too fast some some things so one thing you'll notice I've noticed this as well Crystals, you know timing crystals the lead times are up to 42 weeks from Epson 24 weeks from Abercon in ECS and DK if they got them they're three weeks. So buy from them Ceramic capacitors, you know, also 24-week lead time till it's a little intense But still, you know, they're they're available in the market although I'm seeing, you know crystals be difficult to get Inductors, you know, not too bad 16 weeks Ribbon contacts not too bad, you know 10 weeks for from Rolex and emphanol You know some of these are a little bit longer JST which has sort of long lead times You know hard work connects Phoenix has only seven weeks Harding 4.3. So not too bad here But you're what you're gonna see the TE seems like isn't as a company is having some long lead times If they ever appear, they're always longer like headers or their headers are 24 weekly time But what you'll notice is where it gets really a little bonkers is chips down here semiconductors op-amps aren't too bad You know 20 week lead time but switching regulators. So MPS common regulator company 50 weeks microcontroller arm Cortex STM's 45 weeks and XP's 51 weeks microchips 41 weeks TI 20 weeks I think that's that's a little it depends though, right because TI doesn't make that many Cortex chips. I think they make mostly MSP for 30s and then Xilinx You know 52 weeks. So you're gonna see really long lead time still for semiconductors This is good to test also they have company so, you know common companies if you look at, you know, micro Chip you can look at their 8-bit micros 40 weeks arms again 41 weeks E prompts 40 weeks 32 bits 40 weeks FPGA is 20 weeks. So yeah, you want FPGA is good to go Looks like TI actually is not too bad 14 to 20 weeks and all devices also not too bad ST, you know, everyone knows that the ST microcontrollers right now are just impossible to get so It doesn't look like it's going to get much better for the next 30 40 weeks So hopefully find some alternatives or maybe you've got some stock Okay, so but back to coin cell holders. So look let's look at coin cell Holder because that's what we're we're here for So you can get You know, you can get Batteries as well even though this is like search for holders. Don't forget you can also get your batteries here Although no, you can't ship them air. You'll ship ground. So just be aware of that Dressel has a little like happy family here. Yay Yeah, I'm taller than you you can't have this battery. I know what's teasing the person looks like it's a little mean All sorts of batteries, but let's go back to but again, what I like about the CR 12 20s You can actually get them at a grocery store. They're that common. All right. So clips and contacts All right, so the first thing you'll want to do is of course, let's only get active ones and We're gonna look for the ones for our CR 12 20. Don't forget the 12 is the 12 millimeters diameter so let's look for 12 millimeter diameter Coin holders, which is battery cell size You can see that. Okay. Let's go down 10 11.6 12 12.5. I'm gonna grab 11.6 12 and 12.5 You know, I don't ever see a 12.5 millimeter battery, but you know, you never know maybe that holder can can have both types All right, so we have about 65 options left and you can see, you know, we're starting to see some of the ones This this is a two-hole one and this is again that surface mount one One thing I know is that coin cell holders is like they're kind of jelly bean if you like this style again the top Pressing style you can get them from like 10 different fabrication companies Let's go for the surface mount because we want to be pick and place of all and then You can Select different companies there's Battery series again. There is a little bit of a difference between there's the 12 16s 12 20 and 12 25 that's the thickness. It may affect your holder. So just be aware They're not necessary. I have been bit by I got a holder and it was for 12 25 I tried to put a 12 16 and just like slid right out. So just be aware of that Okay, so there's a couple different kinds again There's this snap top kind a couple different companies make them. They're very common There's also this kind. There's also a sort of snap top type And this one which is like really big Look a little bit like a spaceship, but I rather like the I really do like these bent metal ones Links and MPD both make ones with a smaller tabs, but I really like the chunky tabs Also, you can get ones with little holders We're probably wondering why would you ever want that little plastic piece if you want to hold two batteries in? You can't have metal that will contact the outside because it'll short the middle battery together So you have to have something protecting it if you think about it, you know the outer ring is a Pole right it's not like a double-a battery where like you have it on the ends and so you have the batteries next to each other They're not going to short with these if you have a bunch of batteries stacked up and the metal is against the side It'll short the batteries together So you you would need that plastic piece if you had multiple batteries and then there's some simple ones These I don't like these as much. These are a little bit too simple because there's no mechanical, you know Thing holding them together again. I like these because they've got that stop. You're the battery can't push Too far back So let's look at ones that are in stock and let's sort by price and It's my favorite the atom tech. So this is the one. I like this is the one you saw on the overhead Thank you. And these come in 20 millimeter size and like maybe 24 millimeter They come in various sizes, but for real-time clocks. I really like these. It can't be the price 10 cents for a battery holder and super easy to solder super easy to pick in place and that they're really near indestructible I've never seen them break, you know, unless they get completely smashed They'll hold your battery in place for a very long time and it's very hard for the battery to shake loose So this is my pick for the research coin cell battery holders, and that's research