IEC TS 62564-1 – Aerospace Qualified Electronic Components (AQEC) for Avionics

Process management for avionics – Aerospace qualified electronic components (AQEC) – Part 1: Integrated circuits and discrete semiconductors

The avionics industry faces a unique challenge: electronic components used in aircraft systems must meet exceptionally high reliability standards while accommodating rapidly evolving commercial semiconductor technology. IEC TS 62564-1:2016, developed by Technical Committee 107 (Process management for avionics), defines the requirements for Aerospace Qualified Electronic Components (AQEC), providing a framework for using commercial off-the-shelf (COTS) semiconductors in avionics applications while ensuring the necessary level of quality, reliability, and long-term support.

📋 Scope and Purpose

IEC TS 62564-1 specifies the minimum requirements for AQEC classification of integrated circuits (ICs) and discrete semiconductors used in avionics systems. The standard addresses the complete lifecycle from initial component selection through qualification, production, and obsolescence management.

The key objectives of the AQEC framework include:

Lifecycle management — Ensuring component availability for the typically 20-30 year service life of aircraft
Quality assurance — Defined qualification and periodic testing requirements
Traceability — Comprehensive documentation including material composition, manufacturing lot, and test results
Change management — Clear procedures for process change notifications (PCN) and last-time buy (LTB) processes
Obsolescence mitigation — Strategies for managing component end-of-life in long-life systems

AQEC bridges the gap between commercial semiconductor manufacturing and aerospace requirements. Instead of requiring dedicated military-grade fabrication lines (which are increasingly rare and expensive), AQEC defines additional qualification and monitoring processes that can be applied to components manufactured on commercial lines, making advanced semiconductor technology available to avionics at reasonable cost.

🔧 AQEC Framework and Documentation

AQEC Documentation Requirements

The standard defines a comprehensive set of documentation for AQEC components:

Document Type	Content	Purpose
AQEC Data Sheet	Electrical parameters, operating conditions, thermal data, package details	Component selection and application design
Qualification Report	Test results, reliability data, qualification methodology	Demonstrates suitability for avionics use
Performance Monitoring Data	Production lot results, yield data, parametric trends	Ensures ongoing manufacturing consistency
PCN Documentation	Process change description, impact analysis, change reason	Enables assessment of change impact on avionics application
LTB and Obsolescence Notice	Last order date, final shipment date, suggested replacements	Supports obsolescence management planning
Material Declaration	Material composition, RoHS compliance, conflict minerals	Regulatory and environmental compliance

Qualification Requirements

The AQEC qualification process includes:

Environmental testing — Temperature cycling, thermal shock, moisture resistance, vibration, mechanical shock
Life testing — High-temperature operating life (HTOL), temperature-humidity-bias (THB), and accelerated life tests
Electrical characterization — Complete parametric testing across specified temperature range
Package reliability — Wire bond pull, die shear, solderability, and package integrity tests
ESD and latch-up testing — Per industry standards for avionics environment

One of the most critical challenges in avionics electronic design is managing component obsolescence. With aircraft service lives of 30+ years and commercial semiconductor product lifecycles of 3-5 years, obsolescence is inevitable. The AQEC framework’s structured LTB and PCN processes provide essential tools for managing this challenge, but early planning and strategic component selection remain essential.

🏗️ Engineering Design Insights

Component Selection Strategy for Avionics

When selecting semiconductors for avionics applications, engineers should consider:

Technology maturity — Prefer components with established manufacturing history and multiple sourcing options
Package type — Leaded packages (QFP, SOIC) preferred over leadless (BGA, QFN) for inspection and rework
Temperature range — Components rated for -40°C to +105°C minimum for civil avionics; wider range for military/defense
Supplier stability — Long-term commitment to aerospace market, established PCN processes
Second-source availability — Ideally identify at least one alternative component for critical functions

The AQEC approach leverages commercial semiconductor manufacturing but adds the critical layer of traceability and change management that avionics requires. When implementing AQEC in a project, the most effective strategy is to establish a close partnership between the avionics manufacturer and the semiconductor supplier early in the design phase. This ensures that AQEC documentation requirements are built into the supply agreement from the start.

Obsolescence Management Planning

Effective obsolescence management based on IEC TS 62564-1 includes:

Regular monitoring — Tracking component lifecycle status from semiconductor suppliers
Lifecycle forecasting — Predicting obsolescence dates based on market trends and supplier roadmaps
LTB execution — Strategic last-time buying with sufficient inventory for projected lifetime needs
Design refreshes — Scheduled design updates to replace obsolete components
Alternate parts qualification — Pre-qualification of replacement components before obsolescence occurs

❓ Frequently Asked Questions

Q1: What is the difference between AQEC and standard commercial qualification?
A: AQEC adds additional requirements beyond standard commercial qualification including extended temperature testing, enhanced traceability, formal change management (PCN) processes, long-term supply commitments, and structured obsolescence management. The component die and package may be identical to the commercial version, but the AQEC version has documented traceability and monitoring.

Q2: Does AQEC certification expire?
A: The AQEC classification requires ongoing maintenance. The manufacturer must demonstrate continued process control through periodic performance monitoring. Changes in manufacturing process, assembly site, or materials may require requalification depending on the impact assessment.

Q3: Can AQEC components be used for safety-critical flight control systems?
A: AQEC provides the component-level quality baseline. System-level safety certification (e.g., DO-254 for airborne electronic hardware) requires additional design assurance processes. AQEC components simplify the DO-254 compliance process but are not by themselves sufficient for safety-critical certification.

Q4: What is the typical cost premium for AQEC components?
A: AQEC components typically carry a 30-100% premium over standard commercial components, depending on the complexity of monitoring and documentation requirements. However, this is significantly lower than traditional military-specification components, which can cost 5-10x their commercial equivalents.