# MIS Substrate Design & Manufacturing, Fast Turnaround

_Published: 2025-10-29_

Table of Contents

Toggle

- What Is MIS Substrate?
- What Are Features of MIS Substrates?
- What Are Applications of MIS Substrate?
- Difference Between MIS Substrate and Traditional PCB
- Molded Interconnect Substrate Design Considerations
- MIS Substrate Manufacturing Process
- Why Choose EBest Circuit (Best Technology) as MIS Substrate Supplier?

Why choose **[MIS substrate](https://www.bestpcbs.com/blog/2025/10/mis-substrate-design-manufacturing-fast-turnaround/)**? Let’s discover features, applications, difference between traditional PCB, design consideration, production process for MIS substrate.

**Are you troubled with these questions?**

- Difficulty in 3D structure molding?
- High heat loss in high-frequency scenarios?
- High mass production costs and low yield?

**As a MIS substrate supplier, EBest Circuit (Best Technology) can provide you service and solutions:**

- Collaborative Design: Simulation verification helps avoid pitfalls in advance, significantly reducing trial-and-error costs!
- Flexible Customization: 300°C) but incurs higher costs. PTFE (dielectric constant 2.1) or fluorinated polyurethane (dielectric constant 1.8) is used for high-frequency signal transmission, though mechanical strength requires composite design.
- FR-4 Optimization: Standard choice for general applications. Note dielectric constant drift (4.5–5.5) may affect signal integrity. For high-frequency scenarios, replace with Rogers ceramic substrates or hybrid material designs.

**2. Thermal Management Strategies**

- Copper Layer and Via Design: Use ≥2oz copper thickness in high-power areas, paired with arrayed thermal vias (diameter 0.3–0.5mm, spacing ≤1mm). Fill vias with copper or thermal adhesive to enhance heat conduction. Example: ≥8 vias beneath BGA packages to form thermal channels.
- Layout Optimization: Position power devices (e.g., MOSFETs) near PCB edges or heat sink mounting surfaces, reserving ≥5mm component-free zones. Maintain ≥2.5mm spacing (forced air) or ≥4mm spacing (natural convection) between heat-sensitive components (e.g., electrolytic capacitors) and heat sources. Distribute multiple heat sources to avoid localized overheating.
- External Cooling Enhancement: Integrate heat sinks (thermal pads/adhesives), forced air channels, or liquid cooling systems. Validate thermal performance via simulation (ANSYS) and post-layout testing (thermal imagers/thermocouples).

**3. Structural and Electrical Design**

- Metal Substrate Construction: Single-sided boards require dielectric layer bonding (hole diameter ≥1mm demands ≥0.5mm wall spacing). Double-sided/multilayer boards control total thickness (0.8–3.5mm, extreme 8mm). Rigid-flex designs balance rigid sections (e.g., cold plates) and flex zones, with drilling rules adhering to 10:1 aspect ratios (non-metallic holes).
- Signal Integrity: High-speed traces (e.g., USB3.0) maintain length tolerance ≤±5mil, differential pair length mismatch 1A) require ≥15mil trace widths, via inner diameters ≥0.5mm with thermal relief connections, and minimized loop areas.

**4. Manufacturing Process and Reliability**

- SMT Assembly Control: Pre-bake metal substrates (125°C/2h) to reduce moisture. Reflow peak temperatures (235–245°C) are 5–10°C lower than FR-4. Nitrogen environments (