Electrical Component Availability Problems? Use Aggregated Sourcing Data
Would you design your board around this IC if you knew it wasn’t available? Use a search engine to check electrical component availability first. If you’ve designed a PCB and waited until the design was finished to check electrical component availability, you know the headache involved in redesigning the board around available components. With the […]
Free PCB Footprints and Schematic Symbols for Designers to Use
It isn’t so long ago that I was working through school and taking apart remotes and radios in my house to learn about different electronics. Now that I’m working in the industry, it’s easy to take for granted what is being given to me through industrial organization and standards. It never fails to rain on […]
Component Price Comparisons and Cost Selection for Design Processes
Use the right component search engine for component price comparisons during design. Your new design won’t work at all without electronic components. There are plenty of component distributors in the marketplace that compete with each other on price, lead time, and range of component selection. Component price comparisons are often an early part of the […]
Common Op-Amp ICs and Selection Guidelines
Who doesn’t have a drawer full of LM741 op-amp ICs? Every engineer will develop an intimate relationship with op-amps during their electronics courses. These are fundamental circuits in analog electronics and are used as the building blocks for high-precision power systems, amplifiers, filters, and many other devices. You probably won’t be using the same op-amps […]
Your Component Footprint Library to Find Future Footprints
Your component footprint library gets used to generate this type of stencil before manufacturing. Every new piece of electronic equipment starts as a block diagram, and turning your block diagram into a new board takes a complete set of PCB footprints. Your manufacturer will need a set of documentation to put your new board into […]
Electric Circuit Model Download: Schematics and SPICE Simulation
Each of these components needs a SPICE model if you need to perform simulations. I can’t count the number of times I’ve downloaded component data through my CAD software, only to find there was no SPICE subcircuit model attached to the component data. Circuit simulations from your schematics are a great way to verify your […]
0402 Package Footprint: Sizes and Parameters
Thin film resistor in 0402 package. In modern electronics, miniaturization continues to drive component selection and system design. As engineers pack more functionality into smaller devices like wearables, IoT sensors, and mobile phones, the physical size of passive components shrinks accordingly. Among the vast array of Surface Mount Device (SMD) packages, the 0402 package has […]
0402 封装: 电阻尺寸和参数
电子元件有着多种不同形状和尺寸，从极其复杂的接点栅格阵列元件/球栅阵列元件到简单的轴向电阻和电容，不一而足。如果您曾经接触过 SMD 元件，您可能对贴片电阻及其封装尺寸并不陌生。其中最小，但又最常使用的是 0402 电阻，它的 SMD 焊盘封装尺寸非常小。 虽然这些元件的额定功率非常小，但它们在多种设备中广泛应用，基本上涵盖了所有现代数字系统。0402 封装需要在您的 CAD 工具中进行仔细设计，才能成功完成您的 PCB 布局。以下是在 0402 封装中需要注意的事项，以及在哪里可以找到所有元件的验证封装。 0402 封装尺寸 0402 封装几乎是最小的贴片电阻封装，仅有 0201 贴片电阻封装比它小。对比更大的电阻或同类轴向电阻，0402 电阻的小尺寸使其额定功率耗散非常低。这就限制了通过这些设备的电流。下面这个表格显示了一些标准贴片电阻元件的尺寸与额定功率；不过，需要注意的是电阻的尺寸会因不同制造商而有所不同。 这些封装已高度标准化，可以轻松为其中的某个元件构建 3D CAD 模型。事实上，您的 PCB 设计软件很可能附带有常用 SMD 元件的库，包括 0402 电阻；这些库将包括简单的原理图符号、PCB 封装（符合 IPC 标准的焊盘图形）和3D CAD 模型。通用元件模型(即不特定于任何制造商)通常会使用基本的无源电路符号作为原理图符号，它们可能没有特定的 PCB 封装或 3D 模型。 创建您自己的 0402 封装 上面的表格明显揭示了：0402 封装电阻非常小! 虽然 0402 贴片电阻非常小，但您所需要的焊盘图形和元件边界框可能会相当大，这取决于您完成电路板的组装程序。事实上，由于组装和焊接的难度很大，0402 的焊盘图形显然是个众所周知的设计难点。 简而言之，对于小型电阻，如 0402 和 […]
Component Selection in Electronic System Design
My wife makes meticulous grocery shopping lists for us every week and we go to the store each weekend to restock the fridge and pantry. We know exactly what we need when mapping out each week and it causes us to spend less time wandering the aisles in the grocery store. Likewise, before you create […]
Efficiently Creating PCB Footprints: A Checklist for Your Layouts
PCB component footprints may appear simple, but they contain a huge amount of information required for assembly. Your PCB design application will need to take your footprints and create manufacturing documentation, such as assembly drawings and Gerber files. If your PCB footprints are incorrect or contain careless errors, you may find your board cannot be […]