As for most parts, if you order more than just a few pcs, LCSC is the cheapest source of these components (however, you need to consider the rather expensive shipping costs).
Here’s some SMA connectors I’ve used:
Note that I don’t use them in typical RF applications, so I don’t have any information on impedance matching or accuracy etc.
The 74HC4051 and its variants such as the CD74HC4051 have an input called INH or ~E depending on the manufacturer.
Typically you should hard-connect this pin to GND in order to always enable the multiplexer.
Whenever you want to disable the multiplexer (i.e. none of the inputs is connected to the output, connect this pin to Vcc temporarily.
Source: This NXP datasheet, section 7.
LCSC offers the SHOU HAN MSK12CO2-SZ microswitch for about 0,023€/pc @ 1kpc. One of the disadvantages of this switch is that even though it is a pure SMD (no through soldering required), it is shipping as bulk in a bag and not as tape. Therefore, it is not suitable for all commercial assembly lines and needs to be assembled manually.
But at least it is cheap – that is, if you buy enough stuff to justify the high LCSC shipping costs.
The KiCAD footprint for this switch is Button_Switch_SMD:SW_SPDT_PCM12. Even though it’s a different switch than the C&K PCM12, it’s mostly compatible footprint-wise – even though the drill sizes are very slightly off, the footprint works well.
This switch is likely rated to DC12V, 50mA (listed as such on the LCSC website). However, from the datasheet, the exact rating is unclear, it mostly covers the test conditions
If you are looking for an alternative suitable for automated assembly, take a look at the SK-3296S-01-L1 which comes as a taped reel. It is almost 35% more expensive but given that it’s still just 0,031€/pc @1kpc and given that you’re likely not a chinese electronics designer in extreme mass manufacturing, the price is hardly worth thinking about.
It is exactly compatible footprint-wise with the C&K PCM12, so the KiCAD Button_Switch_SMD:SW_SPDT_PCM12 works even better.
This switch is rated at DC12V, 50mA.
This is the MK-13C03-G010 which is rated at 6V 1A or 12V 0.5A. This type of current rating with voltage is related to arcing when breaking the contact.
It is priced around 0,11€/pc @1kpc.
This one is compatible with the C&K PCM13 (but rated at higher current), so use the Button_Switch_SMD:SW_SPDT_PCM13
As for most components, LCSC has the best prices if you want to order more than just a few MOSFETs (due to the high shipping fees)
These are mostly SOT23-3, so the don’t provide good power dissipation. These are mostly used for switching voltages on and off and not for linear applications.
As for most parts, if you order more than just a few, LCSC is the cheapest source of these components (however, you need to consider the rather expensive shipping costs).
The prices given are for budgetary purposes only.
On the MAX11200EEE+ and the MAX112100EEE+, bit 3 of the command byte is named IMPD but this bit is never described in detail in the datasheet.
The meaning of this bit is Immediate power-down. When you set it to 1, the IC will switch to power-down mode. This is evidenced by the power-down example in Table 8 in the datasheet.
The MAX11200EEE+ and the MAX112100EEE+ operate using SPI Mode 0. Therefore, CPHA=0 & CPOL=0.
For more information, see the datasheet.
Generally, SMD ferrites of a given size are characterized by:
100 MHz)100 Ω @ 100 MHz) do not filter EMI that well, but also distort your data signals less. Use them for high speed signals above 1 MHz1kΩ @ 100 MHz, filter EMI really well but will distort any high speed signal. Use them for low speed signals below 1 MHz0.1A of current rating to be able to handle soft short circuits20% is typically fine)As with most passive parts, LCSC generally has the lowest pricing if you buy a bunch of parts.
Keep in mind the expensive shipping, but since they are often 50 times cheaper (!) than other distributors, it might be worth it even if just ordering a reel of ferrites.
This section contains cheap SMD ferrite beads for < 1A current rating.
Low impedance (<= 500Ω):
0.0019€/[email protected] = 7.60€/reelHigh impedance (>= 500Ω):
0.0026€/[email protected] = 10.40€/reel0.0027€/[email protected] = 10.80€/reel0.0044€/[email protected] = 17.60€/reel0.01264€/[email protected] = 50.56€/reel0.0181€/pc = 72.40€/reelThis section contains cheap SMD ferrite beads for > 1A current rating.
Low impedance (<= 500Ω):
0.006€/[email protected] = 24. 00€/reel0.0086€/[email protected] = 34.40€/reelHigh impedance (>= 500Ω):
0.0088€/[email protected] = 35.20€/reel0.0095€/[email protected] = 38.00€/reelI generally use the LTV-356T optocoupler (phototransistor output) for general purpose applications. It has a smaller footprint than most DIP-derived SMD optocouplers and a thinner package. Its pin pitch is 2.54mm whereas the center-distance between the pads is 6.5mm. It it rated
It is available:
0,12€/[email protected]0,056€/[email protected]The LTV-356T has the advantage of being available from different sources in large quantities. However, you can get a pin-compatible variant LTV-356T-C which is only rated for 35V on the output:
0,0404€/[email protected]At LCSC, you can also get the half-width OR-3H7B-TP-Gwith a pin pitch of only 1.27mm for 0,0424€/[email protected]
Typically, 1% thick film resistors are used as general purpose SMD resistors. Most of these are spec’d with a 100ppm/°C temperature coefficient.
From all the “normal” distributors, in my experience LCSC has by far the cheapest resistors – around 3€ per reel (5000pcs) of 0603 resistors. Note, however, that they charge around 35€ of shipping to Germany. So you have to buy a lot of resistors in order to compensate for the expensive shipping. However, you can also order other components on LCSC (they’re usually quite cheap, especially for passives and other standard components).
0.0006€/pc = 3€/reel0.0006€/pc = 3€/reel0.0006€/pc = 3€/reel0.0006€/pc = 3€/reel0.0006€/pc = 3€/reel0.0006€/pc = 3€/reel0.0006€/pc = 3€/reel0.0006€/pc = 3€/reel
You can find 3D models as 3D-PDF for JST XH connectors on the JST website.
However, in order to obtain STEP or IGES models, you have to look on the jst-mfg.com site.
LCSC is typically the cheapest vendor for buying reels. Note, however, that the shipping fee is rather expensive (around 35€ to Germany), so it will only be worth the saving if you order larger quantities of components.
10nF 0603 50V: 4000pcs of Yageo CC0603KRX7R9BB103 for 5,20€100nF 0603 50V: 4000pcs of CCTC TCC0603X7R104K500CT for 4,80€LCSC has a really cheap all-metal push button for only 0.0129€/pc @50pc
It works with the KiCAD 6.0
Button_Switch_SMD:SW_SPST_TL3342
footprint and the KiCAD 6.0
Switch:SW_Push
symbol.
You can find the 3D models on the Taiyo Yuden website.