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Aerospace Control Module

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Aerospace

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Client Profile

A European Tier-1 supplier in the aerospace and defense industry, specializing in flight-critical electronic subsystems for both commercial jets and UAVs. Their end customers include major aircraft OEMs and defense contractors. The client needed a compact, high-performance control module PCB for integration into an avionics bay on a new medium-range aircraft platform.

Project Scope

Design and deliver a DO-254 compliant multi-layer PCB capable of enduring extreme operational conditions:

  • Altitude range: 0–12,000 meters
  • Temperature: –55°C to +125°C
  • EMI/RFI exposure from radar and communication systems
  • Vibration and shock conditions per MIL-STD-810
  • System reliability: MTBF > 50,000 hours
  • Lifecycle target: 15+ years
Aerospace Control Module

Technical Challenges

  1. High-Density Routing with Redundancy
    • The PCB had to integrate redundant communication buses (CAN + ARINC 429) and multiple microcontroller subsystems within a compact 80mm x 60mm footprint.
    • 0.4mm-pitch BGA packages were required, demanding via-in-pad and laser-drilled microvias for HDI stacking (stacked and staggered structures).
  2. Impedance Control for Signal Integrity
    • The design involved over 60 high-speed signal traces (>150 MHz), including LVDS and differential pairs.
    • Targeted impedance: 90Ω ±5% for differential pairs, 50Ω for single-ended signals.
    • Loss modeling was implemented using Ansys SIwave during pre-layout simulation.
  3. Power Integrity & Thermal Management
    • Power delivery network (PDN) had to support multiple isolated voltage rails (1.2V, 3.3V, 5V, 12V).
    • Thermal analysis showed hotspots under the FPGA and motor driver ICs, requiring thermal vias and strategic copper pour expansion.
    • High-reliability polymer aluminum capacitors were selected for temperature tolerance and ESR performance.
  4. Mechanical & Environmental Requirements
    • Conformal coating compatibility for humidity resistance and arcing protection (Parylene C recommended).
    • Gold fingers and edge connectors had to meet MIL-STD for abrasion and contact resistance.
    • Final PCB thickness was locked at 1.6mm, with ENIG surface finish and IPC-6012 Class 3 compliance.

Our Solution & Process

Phase 1: Architecture & Pre-Layout Review

  • Collaborated directly with the client’s avionics team to finalize block diagrams and I/O mapping.
  • We proposed a 14-layer stackup with sequential lamination and controlled impedance layers sandwiched between reference planes.
  • Introduced isolation zones between analog sensing circuits and noisy digital blocks.

Phase 2: PCB Layout & Simulation

  • Layout performed in Altium Designer with simulation in HyperLynx for SI/PI validation.
  • Employed guard traces and differential routing with <10 mil skew.
  • Routed high-speed buses (ARINC 429, SPI, CAN) with matched lengths and minimum number of vias to reduce insertion loss.
  • GCPW (Grounded Coplanar Waveguide) used for RF signal routing to minimize radiation.

Phase 3: DFM/DFT Preparation

  • Applied aerospace-specific DFM/DFT rules, including:
    • Via filling and capping for via-in-pad
    • PCB panelization strategy for shock resistance
    • Controlled annular rings and test point placements
  • All outputs passed design rule checks (DRC), electrical rule checks (ERC), and BOM risk analysis (RoHS, obsolescence).

Phase 4: Prototype Testing & Validation

  • Delivered three prototype batches to the client’s EMS provider.
  • Boards passed the following tests:
    • Flying probe electrical testing
    • 100-hour temperature cycling (-55°C to +125°C)
    • EMI test per RTCA/DO-160G
    • Functional tests under simulated avionics bay conditions
  • Cross-verification with FPGA firmware showed zero functional mismatches.

Outcome & Benefits

  • First-pass success without need for PCB rework or layout revisions
  • Final design approved for pilot flight integration within 12 weeks
  • Helped client cut estimated project timeline by 20%
  • Reduced EMI emissions by 15% over their legacy design
  • BOM optimization reduced component lead time and cost risks

Client Feedback (Project Lead Engineer, Avionics Division):

“We’ve worked with several PCB vendors before, but your team was the first to deliver a DO-254-ready layout that passed EMI and thermal tests on the first go. Your understanding of aerospace compliance and attention to detail made this collaboration frictionless. Looking forward to bringing you in on our next UAV control project.”

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Faith
Faith – Article Reviewer

Faith is the Technical Reviewer and Sales Director at IWDF Solutions, with over 15 years in the PCB industry. He reviews articles, and his goal is to make sure the guidance shared is practical for teams preparing a design for manufacturing, not just conceptually correct.

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IWDF Solution Author-Henry
Henry – Article Author Bio

Henry is a Senior PCB Design Engineer at IWDF Solutions with more than a decade of experience turning schematics into production-ready boards. His work focuses on layout feasibility, signal integrity, and manufacturability, helping teams reduce redesign cycles and avoid costly production issues. He writes about PCB design from the perspective of what actually works in fabrication and assembly, not just in simulation.

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