{"id":3409,"date":"2026-09-23T10:49:35","date_gmt":"2026-09-23T02:49:35","guid":{"rendered":"http:\/\/www.mikeiken-job.com\/blog\/?p=3409"},"modified":"2026-09-23T10:49:35","modified_gmt":"2026-09-23T02:49:35","slug":"how-to-design-a-pcb-for-automotive-electronics-4a96-fbcdb2","status":"publish","type":"post","link":"http:\/\/www.mikeiken-job.com\/blog\/2026\/09\/23\/how-to-design-a-pcb-for-automotive-electronics-4a96-fbcdb2\/","title":{"rendered":"How to design a PCB for automotive electronics?"},"content":{"rendered":"

Alright, let\u2019s talk about designing PCBs for automotive electronics \u2013 something I\u2019ve been deep in for over a decade as part of our PCB design supply team. If you\u2019ve ever worked on a car, you know how much tech\u2019s in there these days: from the infotainment touchscreen that\u2019s basically a tablet to the safety systems that keep you from crashing, and even the tiny sensors that monitor your tire pressure. None of that works without a solid PCB under it, and automotive PCBs aren\u2019t like the ones you build for a hobby project. They have to handle way more stress, and getting them wrong isn\u2019t just a hassle \u2013 it can be dangerous. Let\u2019s break this down the way we actually do it in our shop, no stuffy jargon that makes your eyes glaze over. Electronic PCB Design<\/a><\/p>\n

<\/p>\n

First off, there\u2019s no skipping the safety and compliance checks. When we take on an automotive PCB project, the first thing we don\u2019t just look at is the schematic \u2013 we dive into ISO 26262. You might\u2019ve heard that acronym before, but it\u2019s not just a checkbox. It\u2019s the whole framework for functional safety in cars, and it splits things into ASIL ratings (Automotive Safety Integrity Levels) from A to D, with D being the strictest (think airbags or brake systems). For a simple door control module, that\u2019s probably ASIL A or B, but an ADAS (Advanced Driver Assistance Systems) radar? That\u2019s ASIL D, no exceptions. Our team doesn\u2019t just design to a schematic here \u2013 we build in redundancy from the start. Like, if a critical power line has two paths instead of one, that\u2019s not overengineering \u2013 that\u2019s making sure if one line fails, the other picks up the slack. We also have to account for AEC-Q100 component qualifications. Regular consumer chips (like the ones you grab at the local electronics store) can\u2019t handle the -40\u00b0C to 125\u00b0C temperature swings a car sees, especially under the hood. We specify every part from certified suppliers, no knockoffs here \u2013 that\u2019s a non-negotiable for us.<\/p>\n

Next up, thermal management. Cars get hot \u2013 really hot. If you\u2019ve ever left a water bottle in your dashboard in summer, you know how that feels. Now imagine a PCB packed with power components like motor drivers or infotainment amps. They generate heat, and if that heat can\u2019t escape, the whole thing fails faster than a phone left on a dashboard all day. How do we tackle this? First, we do thermal simulations before we even lay out a single trace. We use tools that map out where the heat will pool, then we add what we call \u201cthermal vias\u201d \u2013 tiny holes that connect the top layer of the PCB to the bottom (or to a separate metal core layer) to pull heat away. For high-power modules, we often use an aluminum or copper core PCB instead of the standard fiberglass one \u2013 it\u2019s a bit pricier, but it dissipates heat like crazy. We also leave extra space around hot components so air can flow through, no tight squeezing just to cram more parts in. Last year, we had a client who was having overheating issues with their electric power steering PCB \u2013 we swapped their fiberglass core for a copper one and added 12 thermal vias, and their operating temp dropped 18\u00b0C. No more field failures.<\/p>\n

Then there\u2019s the big one: signal integrity and EMI\/EMC. Automotive environments are full of noise. Your car\u2019s alternator, the radio, even other electronics on the road create electromagnetic interference (EMI), and if your PCB can\u2019t handle that, it\u2019ll cause glitches \u2013 like your speedometer cutting out or your lane departure warning misfiring. Electromagnetic Compatibility (EMC) is two-fold, too: we can\u2019t let our PCB interfere with other systems, and it has to ignore interference from them. Here\u2019s how we pull this off in our shop. First, we separate analog and digital circuits on the PCB. Analog stuff like sensor signals is super sensitive to noise, so we keep it on its own layer, or at least a separate section, away from the digital parts that switch on and off fast and create noise. We use shielded traces for high-frequency signals (like CAN bus, which is the communication backbone for car systems) \u2013 we ground the shield at one end to avoid ground loops. Ground loops are a huge pain; they happen when there\u2019s two different ground potentials, and they create current that messes up signals. We design a solid ground plane (not a bunch of scattered ground traces) to keep all grounds at the same potential. Also, we size power traces correctly. A lot of new designers make the mistake of using thin traces for power to save space, but thin traces have higher resistance, which causes voltage drop and generates more heat. For 12V systems, we use 20mil minimum traces, but for high-current parts like motor drivers, we bump that up to 50mil or even 100mil, plus add copper pours on the power layers to spread the current. We also do a post-layout EMC simulation to catch any hot spots before we send the design to fabrication \u2013 way cheaper than fixing it after the prototype is built.<\/p>\n

Mechanical and environmental durability is another thing that separates automotive PCBs from regular ones. These things vibrate nonstop. The engine shakes, the car bounces on potholes, so the PCB has to hold up to vibration and shock. We spec thicker PCBs \u2013 usually 1.6mm, sometimes 2mm if it\u2019s a module mounted under the hood \u2013 instead of the 1mm hobbyists use. We avoid large, flat copper planes on outer layers where possible, because they can crack under vibration. Instead, we add small copper pours with gaps to give the PCB some flexibility. We also place heavy components (like connectors or power modules) closer to the mounting holes, which reduces stress on the board. And for environmental stuff, we apply a conformal coating \u2013 usually acrylic or polyurethane \u2013 to seal the PCB from moisture, dust, and even chemicals like road salt. That\u2019s critical for PCBs that go under the car or in the wheel well, where water and salt are constant. Last winter, a client\u2019s brake control PCBs were failing because of salt corrosion; adding a thin conformal coating fixed 90% of those issues.<\/p>\n

Connectors and integration are the final piece of the puzzle that a lot of people overlook. Automotive PCBs don\u2019t live in a vacuum \u2013 they connect to other modules, sensors, power, and the car\u2019s communication network. We choose automotive-grade connectors, obviously, but we also design the PCB footprint to match exactly \u2013 no forcing a consumer connector to fit, even if it\u2019s cheaper. We leave enough space around connectors for insertion and withdrawal, because if you cram a connector in too tight, a mechanic can\u2019t plug it in when they\u2019re repairing the car. We also think about wiring harnesses \u2013 the PCB\u2019s connector pins need to align with the harness wires so there\u2019s no cross-talk or strain on the connection. For high-voltage systems (like EV battery modules), we follow even stricter spacing rules between high-voltage and low-voltage traces to prevent arcing \u2013 that\u2019s another ISO 26262 requirement we take seriously.<\/p>\n

Wait, let\u2019s talk about prototyping and testing too, because that\u2019s where a lot of designs go wrong. We don\u2019t just send a design to fabrication and wait for the first sample. We build a prototype as soon as the layout is done, and we test everything: functional testing (does the infotainment turn on?), environmental testing (does it work in a temperature chamber at -40 and 125\u00b0C?), vibration testing on a shaker table, and EMC testing in an anechoic chamber. If we find an issue \u2013 like a signal glitch at high speed \u2013 we don\u2019t just band-aid it; we go back to the layout and fix the root cause. For example, a client working on a self-driving car sensor had a signal error because the CAN bus trace was too close to a power trace \u2013 we moved the traces apart and added a ground gap between them, and the error was gone.<\/p>\n

Something I always tell new designers: automotive PCB design isn\u2019t about cutting corners to get the cheapest part. It\u2019s about balancing performance, cost, and safety. We work closely with our clients from the start \u2013 even before they have a full schematic \u2013 to advise on component selection, layout strategies, and compliance. A lot of small engineering teams think they can design an automotive PCB themselves, but they run into issues with certification, compliance, or testing down the line, which ends up costing them more time and money. That\u2019s why our team focuses on end-to-end PCB design for automotive, from concept to prototype to production-ready files.<\/p>\n

<\/p>\n

At the end of the day, the goal is to make a PCB that works 100% of the time, no matter what the car throws at it. It\u2019s not just about circuits and traces \u2013 it\u2019s about keeping drivers safe, making infotainment work smoothly, and ensuring every part of the car functions as it should. If you\u2019re working on an automotive project and need a PCB design partner that gets the unique demands of the industry, we\u2019re here to help. Let\u2019s talk through your project, whether it\u2019s a tiny sensor module, an ADAS system, or an EV power module. We\u2019ll make sure your PCB is compliant, durable, and built to last.<\/p>\n

PCB<\/a> References:<\/p>\n

    \n
  1. International Organization for Standardization. (2018). ISO 26262: Road vehicles \u2013 Functional safety.<\/li>\n
  2. International Organization for Standardization. (2020). ISO 10605: Road vehicles \u2013 Electromagnetic compatibility test methods for electrical and electronic components.<\/li>\n
  3. Automotive Electronics Council. (2021). AEC-Q100: Stress test qualification for integrated circuits.<\/li>\n
  4. Johnson, H., & Graham, M. (2016). High-Speed Signal Integrity (2nd ed.). Prentice Hall.<\/li>\n<\/ol>\n
    \n

    Lucky Dragon Technology Shenzhen Co., Ltd.<\/a>
    With abundant experience, we are one of the most professional electronic PCB manufacturers and suppliers in China. We warmly welcome you to buy bulk high quality electronic PCB for sale here from our factory. If you have any enquiry about cooperation, please feel free to email us.
    Address: 5th Floor, Building 1, Jinshan Industrial Park, 375, Xixiang Section, Guangshen Road, Xixiang Street, Baoan District, Shenzhen City, Guangdong Province, China
    E-mail: sales@Ldtac.com
    WebSite:     https:\/\/www.ldtac.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Alright, let\u2019s talk about designing PCBs for automotive electronics \u2013 something I\u2019ve been deep in for … How to design a PCB for automotive electronics?<\/span>Read more<\/a><\/p>\n","protected":false},"author":934,"featured_media":3409,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3372],"class_list":["post-3409","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-electronic-pcb-design-4df1-fc2ea5"],"_links":{"self":[{"href":"http:\/\/www.mikeiken-job.com\/blog\/wp-json\/wp\/v2\/posts\/3409","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.mikeiken-job.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.mikeiken-job.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.mikeiken-job.com\/blog\/wp-json\/wp\/v2\/users\/934"}],"replies":[{"embeddable":true,"href":"http:\/\/www.mikeiken-job.com\/blog\/wp-json\/wp\/v2\/comments?post=3409"}],"version-history":[{"count":0,"href":"http:\/\/www.mikeiken-job.com\/blog\/wp-json\/wp\/v2\/posts\/3409\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.mikeiken-job.com\/blog\/wp-json\/wp\/v2\/posts\/3409"}],"wp:attachment":[{"href":"http:\/\/www.mikeiken-job.com\/blog\/wp-json\/wp\/v2\/media?parent=3409"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.mikeiken-job.com\/blog\/wp-json\/wp\/v2\/categories?post=3409"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.mikeiken-job.com\/blog\/wp-json\/wp\/v2\/tags?post=3409"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}