# Design and Layout **URL:** https://sierraconnect.protoexpress.com/c/design-and-layout/5.md?page=1 [Latest](https://sierraconnect.protoexpress.com/latest.md) · [Categories](https://sierraconnect.protoexpress.com/categories.md) · [Tags](https://sierraconnect.protoexpress.com/tags.md) **Page:** 2 --- ## [Why Your High-Power PCBs Fail: 3 Main Reasons](https://sierraconnect.protoexpress.com/t/why-your-high-power-pcbs-fail-3-main-reasons/4070)
**Author:** [@Mohamed\_Faheemuddin](https://sierraconnect.protoexpress.com/u/Mohamed_Faheemuddin)\ **Replies:** 0\ **Last updated:** [May 19, 2026, 4:24pm UTC](https://sierraconnect.protoexpress.com/t/why-your-high-power-pcbs-fail-3-main-reasons/4070 "2026-05-19T16:24:15Z")
Originally published at: https://www.protoexpress.com/blog/why-high-power-pcbs-fail/ High-power PCBs fail when current-induced heating, voltage stress, and mechanical strain exceed the design limits. These problems a… --- ## [How do you decide when a PCB trace needs termination?](https://sierraconnect.protoexpress.com/t/how-do-you-decide-when-a-pcb-trace-needs-termination/4064)
**Author:** [@milan](https://sierraconnect.protoexpress.com/u/milan)\ **Replies:** 2\ **Last updated:** [May 13, 2026, 2:22pm UTC](https://sierraconnect.protoexpress.com/t/how-do-you-decide-when-a-pcb-trace-needs-termination/4064 "2026-05-13T14:22:27Z")
We often see high-speed designs fail timing validation or exhibit intermittent data errors, not because the logic was wrong, but because trace reflections, ringing, or overshoot corrupted signal edges. In many cases, the… --- ## [Include Serial Number on Board](https://sierraconnect.protoexpress.com/t/include-serial-number-on-board/4045)
**Author:** [@allen.morrison](https://sierraconnect.protoexpress.com/u/allen.morrison)\ **Replies:** 6\ **Last updated:** [May 12, 2026, 7:45pm UTC](https://sierraconnect.protoexpress.com/t/include-serial-number-on-board/4045 "2026-05-12T19:45:32Z")
Howdy, How would I go about adding a unique serial number to each board in an order that Sierra Circuits fabricates? For example, on the silkscreen, I have the part number and revision and a place for the serial number… --- ## [Allowable flex limits for rigid FR-4](https://sierraconnect.protoexpress.com/t/allowable-flex-limits-for-rigid-fr-4/4013)
**Author:** [@anderson](https://sierraconnect.protoexpress.com/u/anderson)\ **Replies:** 7\ **Last updated:** [May 12, 2026, 3:34pm UTC](https://sierraconnect.protoexpress.com/t/allowable-flex-limits-for-rigid-fr-4/4013 "2026-05-12T15:34:29Z")
How much flex can a standard rigid FR-4 PCB tolerate before long-term damage occurs? I understand it depends on factors such as board thickness, layer count, and board size, but is there a thumb rule for estimating a saf… --- ## [HDI vs. Standard PCB](https://sierraconnect.protoexpress.com/t/hdi-vs-standard-pcb/4056)
**Author:** [@Mohamed\_Faheemuddin](https://sierraconnect.protoexpress.com/u/Mohamed_Faheemuddin)\ **Replies:** 0\ **Last updated:** [May 12, 2026, 11:58am UTC](https://sierraconnect.protoexpress.com/t/hdi-vs-standard-pcb/4056 "2026-05-12T11:58:38Z")
Standard and HDI PCBs differ primarily in routing capability, via technology, fabrication complexity, and miniaturization support. Conventional multilayer boards are suitable for moderate-density layouts and standard … --- ## [Protecting exposed PCB features in conformally coated designs](https://sierraconnect.protoexpress.com/t/protecting-exposed-pcb-features-in-conformally-coated-designs/4040)
**Author:** [@anderson](https://sierraconnect.protoexpress.com/u/anderson)\ **Replies:** 6\ **Last updated:** [May 11, 2026, 2:33pm UTC](https://sierraconnect.protoexpress.com/t/protecting-exposed-pcb-features-in-conformally-coated-designs/4040 "2026-05-11T14:33:58Z")
When designing a PCB for humid environments with possible condensation, conformal coating is often used for protection. However, some areas (like connectors and pogo-pin contacts) must be masked and left uncoated. How sh… --- ## [What to know if you’re getting started in RF](https://sierraconnect.protoexpress.com/t/what-to-know-if-you-re-getting-started-in-rf/3492)
**Author:** [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\ **Replies:** 1\ **Last updated:** [May 7, 2026, 2:31pm UTC](https://sierraconnect.protoexpress.com/t/what-to-know-if-you-re-getting-started-in-rf/3492 "2026-05-07T14:31:26Z")
When it comes to RF engineering, some building blocks are absolutely essential. In the latest Trace Talks, Neil Jarvis highlighted one of the most important: amplifiers. What makes them cornerstone compone… --- ## [How do you maintain signal integrity in IPC class 3 PCB designs?](https://sierraconnect.protoexpress.com/t/how-do-you-maintain-signal-integrity-in-ipc-class-3-pcb-designs/4044)
**Author:** [@Pooja\_Mitra](https://sierraconnect.protoexpress.com/u/Pooja_Mitra)\ **Replies:** 2\ **Last updated:** [May 6, 2026, 1:42pm UTC](https://sierraconnect.protoexpress.com/t/how-do-you-maintain-signal-integrity-in-ipc-class-3-pcb-designs/4044 "2026-05-06T13:42:03Z")
We often see IPC class 3 PCBs used in aerospace, medical, and defense applications experience unexpected system failures during validation, not because the design was functionally wrong, but because signal integrity (SI)… --- ## [How do you validate high-speed PCB performance after layout?](https://sierraconnect.protoexpress.com/t/how-do-you-validate-high-speed-pcb-performance-after-layout/4025)
**Author:** [@PoulomiG](https://sierraconnect.protoexpress.com/u/PoulomiG)\ **Replies:** 2\ **Last updated:** [April 29, 2026, 3:22pm UTC](https://sierraconnect.protoexpress.com/t/how-do-you-validate-high-speed-pcb-performance-after-layout/4025 "2026-04-29T15:22:12Z")
We often see high-speed boards that look correct in layout reviews but still fail due to unexpected signal loss, reflections, or timing issues. This usually starts showing up in designs using PCIe, USB 3.x, HDMI, Ethern… --- ## [7 PCB Layout Design Tips for Power Electronics](https://sierraconnect.protoexpress.com/t/7-pcb-layout-design-tips-for-power-electronics/2853)
**Author:** [@Pooja\_Mitra](https://sierraconnect.protoexpress.com/u/Pooja_Mitra)\ **Replies:** 2\ **Last updated:** [April 27, 2026, 6:50pm UTC](https://sierraconnect.protoexpress.com/t/7-pcb-layout-design-tips-for-power-electronics/2853 "2026-04-27T18:50:50Z")
Originally published at: https://www.protoexpress.com/blog/pcb-layout-design-tips-for-power-electronics/ Designing PCBs for power electronics can be challenging due to the interconnected nature of electrical and ther… --- ## [How do you design vias for reliable PCB performance?](https://sierraconnect.protoexpress.com/t/how-do-you-design-vias-for-reliable-pcb-performance/4010)
**Author:** [@Pooja\_Mitra](https://sierraconnect.protoexpress.com/u/Pooja_Mitra)\ **Replies:** 2\ **Last updated:** [April 22, 2026, 2:31pm UTC](https://sierraconnect.protoexpress.com/t/how-do-you-design-vias-for-reliable-pcb-performance/4010 "2026-04-22T14:31:24Z")
We often see via-related issues during layout and DFM reviews because vias are frequently chosen for routing convenience. A via may look like a simple plated hole, but it can directly impact: Manufacturability … --- ## [Heatsink placement strategies for power devices](https://sierraconnect.protoexpress.com/t/heatsink-placement-strategies-for-power-devices/3988)
**Author:** [@Rilley](https://sierraconnect.protoexpress.com/u/Rilley)\ **Replies:** 6\ **Last updated:** [April 21, 2026, 3:34pm UTC](https://sierraconnect.protoexpress.com/t/heatsink-placement-strategies-for-power-devices/3988 "2026-04-21T15:34:14Z")
When designing power modules with SMD components, what is the preferred approach for heat dissipation: placing a heatsink on the top (directly on the component) or on the bottom side of the PCB? Given that many SMD devic… --- ## [CAN Bus PCB Routing – Two Nodes with Unequal Distance to Single Connector](https://sierraconnect.protoexpress.com/t/can-bus-pcb-routing-two-nodes-with-unequal-distance-to-single-connector/3985)
**Author:** [@shyammarimuthu123](https://sierraconnect.protoexpress.com/u/shyammarimuthu123)\ **Replies:** 9\ **Last updated:** [April 18, 2026, 4:14am UTC](https://sierraconnect.protoexpress.com/t/can-bus-pcb-routing-two-nodes-with-unequal-distance-to-single-connector/3985 "2026-04-18T04:14:44Z")
Hi Friends, I am working on a PCB design with the following CAN architecture: Two MCUs on the same board Each MCU has its own CAN transceiver Both transceivers are connected to a common CANH and CANL connector … --- ## [How do you manage propagation delay and timing mismatches in your PCB designs?](https://sierraconnect.protoexpress.com/t/how-do-you-manage-propagation-delay-and-timing-mismatches-in-your-pcb-designs/3994)
**Author:** [@Mohamed\_Faheemuddin](https://sierraconnect.protoexpress.com/u/Mohamed_Faheemuddin)\ **Replies:** 2\ **Last updated:** [April 15, 2026, 2:07pm UTC](https://sierraconnect.protoexpress.com/t/how-do-you-manage-propagation-delay-and-timing-mismatches-in-your-pcb-designs/3994 "2026-04-15T14:07:47Z")
We often see timing-related issues during high-speed design review. This usually becomes critical when working with interfaces like DDR5, PCIe, HDMI, Ethernet, or USB, where timing skew and signal synchronization are tig… --- ## [AC Dimmer (FL5150) Controlled by Low-Power MCU – Grounding and Isolation](https://sierraconnect.protoexpress.com/t/ac-dimmer-fl5150-controlled-by-low-power-mcu-grounding-and-isolation/3949)
**Author:** [@rayansayedpd](https://sierraconnect.protoexpress.com/u/rayansayedpd)\ **Replies:** 1\ **Last updated:** [April 14, 2026, 2:26pm UTC](https://sierraconnect.protoexpress.com/t/ac-dimmer-fl5150-controlled-by-low-power-mcu-grounding-and-isolation/3949 "2026-04-14T14:26:22Z")
I am trying to design an AC dimmer using the FL5150, based on the datasheet reference circuit. I want to control it using a 3.3V MCU: PWM → for dimming control GPIO → for mode selection My main doubts 1. Groun… --- ## [7 Best Practices to Manage EMI in your PCBs](https://sierraconnect.protoexpress.com/t/7-best-practices-to-manage-emi-in-your-pcbs/3989)
**Author:** [@Mohamed\_Faheemuddin](https://sierraconnect.protoexpress.com/u/Mohamed_Faheemuddin)\ **Replies:** 0\ **Last updated:** [April 14, 2026, 1:33pm UTC](https://sierraconnect.protoexpress.com/t/7-best-practices-to-manage-emi-in-your-pcbs/3989 "2026-04-14T13:33:34Z")
Electromagnetic interference (EMI) is one of the most common causes of product failure during compliance testing. It often originates from design decisions made early in the PCB layout stage, such as stack-up, routing… --- ## [Current sharing across layers in PCB design](https://sierraconnect.protoexpress.com/t/current-sharing-across-layers-in-pcb-design/3950)
**Author:** [@mark](https://sierraconnect.protoexpress.com/u/mark)\ **Replies:** 8\ **Last updated:** [April 10, 2026, 7:15pm UTC](https://sierraconnect.protoexpress.com/t/current-sharing-across-layers-in-pcb-design/3950 "2026-04-10T19:15:06Z")
For a 14A current path, is it acceptable to route through vias, or is it better to split the current across wider traces on multiple layers (for example, 120 mil on top and 120 mil on bottom)? --- ## [How do you decide the placement of decoupling capacitors in your layout?](https://sierraconnect.protoexpress.com/t/how-do-you-decide-the-placement-of-decoupling-capacitors-in-your-layout/3955)
**Author:** [@Sushmitha](https://sierraconnect.protoexpress.com/u/Sushmitha)\ **Replies:** 2\ **Last updated:** [April 1, 2026, 1:27pm UTC](https://sierraconnect.protoexpress.com/t/how-do-you-decide-the-placement-of-decoupling-capacitors-in-your-layout/3955 "2026-04-01T13:27:33Z")
We often see placement issues with decoupling capacitors during layout and DFM reviews, especially on high-speed and dense boards. I wanted to start a discussion on how designers approach decap placement to avoid power i… --- ## [Trace width for aerospace PCBs](https://sierraconnect.protoexpress.com/t/trace-width-for-aerospace-pcbs/3873)
**Author:** [@mark](https://sierraconnect.protoexpress.com/u/mark)\ **Replies:** 8\ **Last updated:** [March 27, 2026, 2:40pm UTC](https://sierraconnect.protoexpress.com/t/trace-width-for-aerospace-pcbs/3873 "2026-03-27T14:40:35Z")
How do we determine appropriate trace width and spacing values for aerospace PCBs? --- ## [How to Design PCBs for Data Centers and AI Servers](https://sierraconnect.protoexpress.com/t/how-to-design-pcbs-for-data-centers-and-ai-servers/3942)
**Author:** [@Pooja\_Mitra](https://sierraconnect.protoexpress.com/u/Pooja_Mitra)\ **Replies:** 0\ **Last updated:** [March 26, 2026, 3:24pm UTC](https://sierraconnect.protoexpress.com/t/how-to-design-pcbs-for-data-centers-and-ai-servers/3942 "2026-03-26T15:24:16Z")
Originally published at: https://www.protoexpress.com/blog/how-to-design-pcbs-for-data-centers-and-ai-servers/ Designing PCBs for AI servers and hyperscale data center platforms requires architectures that support ex… --- ## [How do you manage design data handoff without missing critical files?](https://sierraconnect.protoexpress.com/t/how-do-you-manage-design-data-handoff-without-missing-critical-files/3938)
**Author:** [@Pooja\_Mitra](https://sierraconnect.protoexpress.com/u/Pooja_Mitra)\ **Replies:** 3\ **Last updated:** [March 25, 2026, 2:15pm UTC](https://sierraconnect.protoexpress.com/t/how-do-you-manage-design-data-handoff-without-missing-critical-files/3938 "2026-03-25T14:15:14Z")
We often see designers facing problems when handing off files to fabrication, either missing one critical file, incomplete documentation, sending outdated versions, or spending hours trying to compile Gerbers + ODB++ + s… --- ## [While requesting an assembly project I am stuck](https://sierraconnect.protoexpress.com/t/while-requesting-an-assembly-project-i-am-stuck/3932)
**Author:** [@alan1](https://sierraconnect.protoexpress.com/u/alan1)\ **Replies:** 1\ **Last updated:** [March 24, 2026, 4:04pm UTC](https://sierraconnect.protoexpress.com/t/while-requesting-an-assembly-project-i-am-stuck/3932 "2026-03-24T16:04:46Z")
I am not able to get any traction with support team, while placing our order? The support line is not picked up and messages for days are not answered? What’s the best way to get a project to move forward? --- ## [Impedance control for low-speed analog traces](https://sierraconnect.protoexpress.com/t/impedance-control-for-low-speed-analog-traces/3883)
**Author:** [@anderson](https://sierraconnect.protoexpress.com/u/anderson)\ **Replies:** 6\ **Last updated:** [March 19, 2026, 4:47pm UTC](https://sierraconnect.protoexpress.com/t/impedance-control-for-low-speed-analog-traces/3883 "2026-03-19T16:47:49Z")
For a low-speed analog signal driven by an op-amp buffer, a layout designer asked whether an analog trace should be controlled to 50 Ω. I understand 50 Ω is common for digital or RF signals, but this is a low-speed analo… --- ## [How do you design reliable microvias?](https://sierraconnect.protoexpress.com/t/how-do-you-design-reliable-microvias/3922)
**Author:** [@Sushmitha](https://sierraconnect.protoexpress.com/u/Sushmitha)\ **Replies:** 2\ **Last updated:** [March 18, 2026, 12:42pm UTC](https://sierraconnect.protoexpress.com/t/how-do-you-design-reliable-microvias/3922 "2026-03-18T12:42:29Z")
Microvia reliability questions come up regularly during HDI layout and DFM reviews, so I wanted to start a thread on how designers approach microvia design to avoid failures during fabrication and assembly. These tiny v… --- ## [DDR4 layer assignment](https://sierraconnect.protoexpress.com/t/ddr4-layer-assignment/3804)
**Author:** [@bruce\_northrop](https://sierraconnect.protoexpress.com/u/bruce_northrop)\ **Replies:** 18\ **Last updated:** [March 13, 2026, 12:50pm UTC](https://sierraconnect.protoexpress.com/t/ddr4-layer-assignment/3804 "2026-03-13T12:50:03Z")
Hello - Looking for some guidance on layer assignment for data lines on a DDR4 chip set. I’ve been all over the internet and found too much info. Can anyone provide something concise. I’ve also rerouted this a couple tim… --- ## [How do you avoid assembly errors in your layout?](https://sierraconnect.protoexpress.com/t/how-do-you-avoid-assembly-errors-in-your-layout/3907)
**Author:** [@PoulomiG](https://sierraconnect.protoexpress.com/u/PoulomiG)\ **Replies:** 2\ **Last updated:** [March 11, 2026, 12:43pm UTC](https://sierraconnect.protoexpress.com/t/how-do-you-avoid-assembly-errors-in-your-layout/3907 "2026-03-11T12:43:27Z")
We often encounter assembly-related issues during PCBA reviews, especially on dense boards, so I wanted to start a thread to discuss strategies to prevent them during the layout phase. Common causes include incomplete d… --- ## [6 Decap Placement Rules for PCB Designer](https://sierraconnect.protoexpress.com/t/6-decap-placement-rules-for-pcb-designer/3904)
**Author:** [@Mohamed\_Faheemuddin](https://sierraconnect.protoexpress.com/u/Mohamed_Faheemuddin)\ **Replies:** 0\ **Last updated:** [March 10, 2026, 12:24pm UTC](https://sierraconnect.protoexpress.com/t/6-decap-placement-rules-for-pcb-designer/3904 "2026-03-10T12:24:48Z")
Power integrity is a critical aspect of modern PCB design. As digital devices switch faster and consume higher transient currents, maintaining a stable power supply becomes challenging. Even small voltage fluctuations… --- ## [How to Use Via-in-Pad for PCB Design and Manufacturing](https://sierraconnect.protoexpress.com/t/how-to-use-via-in-pad-for-pcb-design-and-manufacturing/3892)
**Author:** [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\ **Replies:** 0\ **Last updated:** [March 4, 2026, 12:09pm UTC](https://sierraconnect.protoexpress.com/t/how-to-use-via-in-pad-for-pcb-design-and-manufacturing/3892 "2026-03-04T12:09:36Z")
Originally published at: Via-in-Pad in PCB Design Manufacturing | Sierra Circuits Multi-layered printed circuit board design requires a means to establish connections between various layers. This is done using vias r… --- ## [How do you avoid common DFM issues before sending files to fab?](https://sierraconnect.protoexpress.com/t/how-do-you-avoid-common-dfm-issues-before-sending-files-to-fab/3888)
**Author:** [@milan](https://sierraconnect.protoexpress.com/u/milan)\ **Replies:** 2\ **Last updated:** [March 4, 2026, 9:07am UTC](https://sierraconnect.protoexpress.com/t/how-do-you-avoid-common-dfm-issues-before-sending-files-to-fab/3888 "2026-03-04T09:07:04Z")
One of the most frequent causes of board delays isn’t routing complexity. It’s preventable DFM issues discovered after files reach fabrication. DFM issues often arise from overlooked details in layout, stack-up, cleara… --- ## [How do you manage thermal issues in your PCB designs?](https://sierraconnect.protoexpress.com/t/how-do-you-manage-thermal-issues-in-your-pcb-designs/3882)
**Author:** [@Mohamed\_Faheemuddin](https://sierraconnect.protoexpress.com/u/Mohamed_Faheemuddin)\ **Replies:** 2\ **Last updated:** [February 25, 2026, 12:20pm UTC](https://sierraconnect.protoexpress.com/t/how-do-you-manage-thermal-issues-in-your-pcb-designs/3882 "2026-02-25T12:20:23Z")
One of the most common queries we receive from designers is: how do I manage thermal issues in my PCB design? High temperatures on a PCB can degrade performance, reduce reliability, and cause failures over time. Thermal… [Previous page](https://sierraconnect.protoexpress.com/c/design-and-layout/5.md) [Next page](https://sierraconnect.protoexpress.com/c/design-and-layout/5.md?page=2)