Modular design is increasingly being adopted across electronics industries, not for novelty but as a way to reduce development time, simplify maintenance, and extend product lifespan. As hardware teams face stricter repairability regulations, greater customization demands, and persistent sourcing challenges, modular electronics are offering a practical and adaptable alternative to traditional integrated designs.
This article outlines what modular design entails, why it’s gaining relevance in 2025, and how it can be implemented effectively.
What Is Modular Electronics Design?
In modular electronics, a product is composed of separate, interchangeable units called modules, each responsible for a specific function. Examples include a communications module, power supply block, or sensor array. These modules connect through standardized interfaces, enabling developers to upgrade or replace parts without redesigning the entire system.
This design approach contrasts with monolithic systems, where all components are integrated into a single PCB. While integrated systems may be more compact or cost-efficient for high-volume products, they are more difficult to adapt or repair.
Why Modular Design Is Becoming More Relevant
Several factors are pushing hardware developers to consider modular architectures:
- Regulatory compliance: Right-to-repair policies in regions such as the EU and some U.S. states are encouraging manufacturers to design products that are easier to disassemble and service. This shift is also reshaping how sustainable electronics are designed.
- Sustainability goals: Products that can be upgraded or repaired rather than discarded are better aligned with environmental regulations and consumer expectations. In 2022 alone, the world generated over 62 million metric tons of e-waste—a number that continues to rise.
- Supply chain risk: Component shortages and EOL issues can be mitigated with modular designs, as changes are often localized to a single unit rather than requiring a full board redesign.
- Product variation: A modular base platform allows teams to produce multiple SKUs by adjusting specific modules, reducing time-to-market and simplifying development.
Benefits of Modular Electronics Design
1. Repairability
Individual modules can be serviced or replaced without affecting the rest of the system. This aligns well with electronics reworkability principles.
2. Upgradeability
Features such as wireless communication, sensors, or displays can be upgraded independently, allowing the product to evolve without a full redesign.
3. Design reuse
Validated modules can be applied across different products or future revisions, saving engineering time and reducing risk.
4. Improved product longevity
Modularity supports longer product life cycles by making it easier to adapt to changing requirements, technology shifts, or regional certifications.
5. Inventory and supply flexibility
Maintaining stocks of compatible modules across products can simplify procurement and reduce lead times. Reusing common parts, such as MCUs, also allows purchasing in larger volumes, which helps reduce overall cost.
Challenges and Limitations of Modular Electronics
While modularity brings clear advantages, it also introduces tradeoffs that need careful consideration:
1. Higher cost
Extra connectors and interfaces increase BOM cost, which can make modular designs more expensive in high-volume production.
2. Larger footprint
Modules and their connectors take more space, making it harder to use modularity in compact or handheld devices.
3. Mechanical complexity
Each module must be secured, thermally managed, and reliably connected, which adds difficulty to the enclosure and layout design.
4. Connector reliability
More connectors mean more potential failure points, especially in high-vibration or harsh environments.
5. Dependency on suppliers
Using third-party SoMs or modules can tie you to another company’s roadmap and availability, adding supply risk.
Because of these factors, modular design should be evaluated case by case. It is most effective in applications where flexibility, long-term serviceability, or multiple product variants are essential.
Common Use Cases for Modular Design
Industries that benefit most from modular design typically involve:
- Industrial control systems, where I/O, power, and communication requirements vary by installation
- Medical devices, especially those used in hospitals or labs, where maintenance and upgrades are frequent
- Prototyping platforms, allowing rapid iterations without reworking the entire system
- Sustainable consumer electronics, including smartphones and laptops designed for field repair and extended use
- System on Modules (SoMs), where high-density BGAs are placed on ready-made modules, easing carrier board assembly and enabling simpler, more flexible production across EMS partners.
Examples like the Fairphone demonstrate how modularity can support both sustainability and user repair. Framework laptops offer another strong example of modularity applied to mainstream consumer tech, with fully replaceable parts and user-friendly design.
Expert Recommendations
1. Plan mounting early
Think about how modules will connect to the main board from the start. For example, castellated pads on SoMs can be soldered directly to the carrier for a lower profile and cost savings on connectors. While end users can’t disassemble them, a repair center can still rework the module if needed.
2. Balance layer count vs. cost
Run the numbers on PCB layer counts before committing. A dense, highly populated SoM paired with a simple low-layer carrier board can save costs in some cases, but not always. Careful analysis ensures you pick the right split for your product.
3. Expect more testing
More modules mean more connection points, which introduce mechanical and thermal stress risks. Plan for extra environmental testing, especially vibration and thermal shock, to validate long-term reliability.
4. Keep modularity in check
Not everything needs to be modular. Focus on long-term components such as MCUs that benefit from upgradeability, and avoid over-segmenting elements that rarely change, like power rails. Too many modules can hurt more than they help.
Conclusion
Modular electronics design offers clear advantages in today’s manufacturing environment, especially where adaptability, repairability, and sustainability are priorities. It is not suited for every product, particularly in ultra-low-cost or highly space-constrained designs. However, for many categories of industrial and professional equipment, modularity can reduce development risk and support longer, more resilient product life cycles.
As regulatory, supply chain, and market pressures continue to evolve, modular design is becoming less of a niche strategy and more of a necessary one.
