![]() ![]() There is a relationship between these 3 values and how they will impact the true capacitance for your end project. 0.1uf, etc.) - Samsung appears to be the winner most of the time we price exercise. From our last review, 0402 SMD parts are the lowest cost for despike (ie. For this reason, we always tweak the design for manufacturing including the use of resistor networks (1206) vs. The assembly fees are usually higher than the cost of the part you are placing. You will have to review the landed cost of the same to your location to see if this is a fit.Ĥ) Try to consolidate your BOM to limit the number of parts to be placed on the PCB during assembly. Last contact we have on file is: Rex ChenĮ-mail: offer true drop in and spec equivalents to the major common mode choke manufacturers at a much reduced BOM cost for USB 2.0 and USB 3.x.įYI: P/N WCM-2012-900T for USB 2.0 High Speed use We have sourced some EMI filters (common mode chokes), direct from another manufacturer for our pending USB 3.x designs and that is Kingcore (Taiwan). Socay has many models to choose from and shipping from Shenzhen is quite simple and relatively low cost. Most recent Socay contact (met with them a few weeks back in HK): Įmail them any details and spec and they can cross to their p/n with datasheet for confirmation.ģ) To kick up your design, consider the use of the EMI filters for USB 2.0 use. Suspecting the USB 2.0 device will be under $ 0.04 USD each. This way, you can always start with a local supplier (higher premium on cost due to lower volume buys) and then migrate to the T&R MOQ quantities of typically 3k pieces per T&R. Always be on the search of at least one other vendor who can offer the same footprint for same fit, form and function. As noted, the costs will be lower but for us, the small delta in cost is usually worth the extra expense so we can continue to use the same SKU on our pending USB 3.x designs.Ģ) DO NOT single source any such parts. They have higher capacitance, lower cost options with fewer channels of protection for USB 2.0 HS / LS support. Review the many public Arduino designs for ideas on USB current protection using polymer SMD fuses.Įxample of a suitable polymer fuse for USB projects:ġ) Review the SOCAY website to find a suitable USB 2.0 fit for ESD and/or EMI filter options. A more robust and faster reaction time but more expensive can be found in solid state USB load switches which offer reverse current protection and also selectable current triggers. Polymer fuses (< $ 0.20 USD from Digikey) are common here but they do derate after numerous triggers. To further enhance the designs, insert some current limit circuit or device into Vbus. (same footprint) as Littlefuse p/n SP3012-04 $0.042 USD in 3k T&R qty (MOQ), Shenzhen, CN. * suitable for USB 2.0 and USB 3.1 Gen 1 (aka USB 3.0) However, in our opinion, there are better suited parts to protect the USB interface. If D7 is stuffed then there is onboard ESD protection. ![]() The xCORE-200 eXplorerKit does offer onboard ESD protection - at least shown in the schematics.
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